/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Plugin for reprogramming only the second image in Flash ROM. * !!! DON'T MESS WITH THIS CODE UNLESS YOU'RE ABSOLUTELY SURE WHAT YOU DO !!! * * Copyright (C) 2003 Jörg Hohensohn aka [IDC]Dragon * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "plugin.h" #if (CONFIG_CPU == SH7034) /* Only for SH targets */ PLUGIN_HEADER /* define DUMMY if you only want to "play" with the UI, does no harm */ /* #define DUMMY */ #define LATEST_BOOTLOADER_VERSION 1 /* update this with the bootloader */ #ifndef UINT8 #define UINT8 unsigned char #endif #ifndef UINT16 #define UINT16 unsigned short #endif #ifndef UINT32 #define UINT32 unsigned long #endif /* hard-coded values */ static volatile UINT8* FB = (UINT8*)0x02000000; /* Flash base address */ #define SECTORSIZE 4096 /* size of one flash sector */ #define ROCKBOX_DEST 0x09000000 #define ROCKBOX_EXEC 0x09000200 #define BOOT_VERS_ADR 0xFA /* position of bootloader version value in Flash */ #define FW_VERS_ADR 0xFE /* position of firmware version value in Flash */ #define UCL_HEADER 26 /* size of the header generated by uclpack */ #if CONFIG_KEYPAD == ONDIO_PAD /* limited keypad */ #define KEY1 BUTTON_LEFT #define KEY2 BUTTON_UP #define KEYNAME1 "Left" #define KEYNAME2 "Up" #else /* recorder keypad */ #define KEY1 BUTTON_F1 #define KEY2 BUTTON_F2 #define KEYNAME1 "F1" #define KEYNAME2 "F2" #endif typedef struct { UINT32 destination; /* address to copy it to */ UINT32 size; /* how many bytes of payload (to the next header) */ UINT32 execute; /* entry point */ UINT32 flags; /* uncompressed or compressed */ /* end of header, now comes the payload */ } tImageHeader; /* result of the CheckFirmwareFile() function */ typedef enum { eOK = 0, eFileNotFound, /* errors from here on */ eTooBig, eTooSmall, eReadErr, eNotUCL, eWrongAlgorithm, eMultiBlocks, eBadRomLink } tCheckResult; typedef struct { UINT8 manufacturer; UINT8 id; int size; char name[32]; } tFlashInfo; static const struct plugin_api* rb; /* here is a global api struct pointer */ static UINT8* sector; /* better not place this on the stack... */ /***************** Flash Functions *****************/ /* read the manufacturer and device ID */ bool ReadID(volatile UINT8* pBase, UINT8* pManufacturerID, UINT8* pDeviceID) { UINT8 not_manu, not_id; /* read values before switching to ID mode */ UINT8 manu, id; /* read values when in ID mode */ pBase = (UINT8*)((UINT32)pBase & 0xFFF80000); /* round down to 512k align, to make sure */ not_manu = pBase[0]; /* read the normal content */ not_id = pBase[1]; /* should be 'A' (0x41) and 'R' (0x52) from the "ARCH" marker */ pBase[0x5555] = 0xAA; /* enter command mode */ pBase[0x2AAA] = 0x55; pBase[0x5555] = 0x90; /* ID command */ rb->sleep(HZ/50); /* Atmel wants 20ms pause here */ manu = pBase[0]; id = pBase[1]; pBase[0] = 0xF0; /* reset flash (back to normal read mode) */ rb->sleep(HZ/50); /* Atmel wants 20ms pause here */ /* I assume success if the obtained values are different from the normal flash content. This is not perfectly bulletproof, they could theoretically be the same by chance, causing us to fail. */ if (not_manu != manu || not_id != id) /* a value has changed */ { *pManufacturerID = manu; /* return the results */ *pDeviceID = id; return true; /* success */ } return false; /* fail */ } /* erase the sector which contains the given address */ bool EraseSector(volatile UINT8* pAddr) { #ifdef DUMMY (void)pAddr; /* prevents warning */ return true; #else volatile UINT8* pBase = (UINT8*)((UINT32)pAddr & 0xFFF80000); /* round down to 512k align */ unsigned timeout = 43000; /* the timeout loop should be no less than 25ms */ pBase[0x5555] = 0xAA; /* enter command mode */ pBase[0x2AAA] = 0x55; pBase[0x5555] = 0x80; /* erase command */ pBase[0x5555] = 0xAA; /* enter command mode */ pBase[0x2AAA] = 0x55; *pAddr = 0x30; /* erase the sector */ /* I counted 7 instructions for this loop -> min. 0.58 us per round Plus memory waitstates it will be much more, gives margin */ while (*pAddr != 0xFF && --timeout); /* poll for erased */ return (timeout != 0); #endif } /* address must be in an erased location */ inline bool ProgramByte(volatile UINT8* pAddr, UINT8 data) { #ifdef DUMMY (void)pAddr; /* prevents warnings */ (void)data; return true; #else unsigned timeout = 35; /* the timeout loop should be no less than 20us */ if (~*pAddr & data) /* just a safety feature, not really necessary */ return false; /* can't set any bit from 0 to 1 */ FB[0x5555] = 0xAA; /* enter command mode */ FB[0x2AAA] = 0x55; FB[0x5555] = 0xA0; /* byte program command */ *pAddr = data; /* I counted 7 instructions for this loop -> min. 0.58 us per round Plus memory waitstates it will be much more, gives margin */ while (*pAddr != data && --timeout); /* poll for programmed */ return (timeout != 0); #endif } /* this returns true if supported and fills the info struct */ bool GetFlashInfo(tFlashInfo* pInfo) { rb->memset(pInfo, 0, sizeof(tFlashInfo)); if (!ReadID(FB, &pInfo->manufacturer, &pInfo->id)) return false; if (pInfo->manufacturer == 0xBF) /* SST */ { if (pInfo->id == 0xD6) { pInfo->size = 256* 1024; /* 256k */ rb->strcpy(pInfo->name, "SST39VF020"); return true; } else if (pInfo->id == 0xD7) { pInfo->size = 512* 1024; /* 512k */ rb->strcpy(pInfo->name, "SST39VF040"); return true; } else return false; } return false; } /*********** Tool Functions ************/ /* place a 32 bit value into memory, big endian */ void Write32(UINT8* pByte, UINT32 value) { pByte[0] = (UINT8)(value >> 24); pByte[1] = (UINT8)(value >> 16); pByte[2] = (UINT8)(value >> 8); pByte[3] = (UINT8)(value); } /* read a 32 bit value from memory, big endian */ UINT32 Read32(UINT8* pByte) { UINT32 value; value = (UINT32)pByte[0] << 24; value |= (UINT32)pByte[1] << 16; value |= (UINT32)pByte[2] << 8; value |= (UINT32)pByte[3]; return value; } /* get the start address of the second image */ tImageHeader* GetSecondImage(void) { tImageHeader* pImage1; UINT32 pos = 0; /* default: not found */ UINT32* pFlash = (UINT32*)FB; /* determine the first image position */ pos = pFlash[2] + pFlash[3]; /* position + size of the bootloader = after it */ pos = (pos + 3) & ~3; /* be sure it's 32 bit aligned */ pImage1 = (tImageHeader*)pos; if (pImage1->destination != ROCKBOX_DEST || pImage1->execute != ROCKBOX_EXEC) return 0; /* seems to be no Archos/Rockbox image in here */ if (pImage1->size != 0) { /* success, we have a second image */ pos = (UINT32)pImage1 + sizeof(tImageHeader) + pImage1->size; if (((pos + SECTORSIZE-1) & ~(SECTORSIZE-1)) != pos) { /* not sector-aligned */ pos = 0; /* sanity check failed */ } } return (tImageHeader*)pos; } /* Tool function to calculate a CRC32 across some buffer */ /* third argument is either 0xFFFFFFFF to start or value from last piece */ UINT32 crc_32(unsigned char* buf, unsigned len, unsigned crc32) { /* CCITT standard polynomial 0x04C11DB7 */ static const UINT32 crc32_lookup[16] = { /* lookup table for 4 bits at a time is affordable */ 0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9, 0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005, 0x2608EDB8, 0x22C9F00F, 0x2F8AD6D6, 0x2B4BCB61, 0x350C9B64, 0x31CD86D3, 0x3C8EA00A, 0x384FBDBD }; unsigned char byte; UINT32 t; while (len--) { byte = *buf++; /* get one byte of data */ /* upper nibble of our data */ t = crc32 >> 28; /* extract the 4 most significant bits */ t ^= byte >> 4; /* XOR in 4 bits of data into the extracted bits */ crc32 <<= 4; /* shift the CRC register left 4 bits */ crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */ /* lower nibble of our data */ t = crc32 >> 28; /* extract the 4 most significant bits */ t ^= byte & 0x0F; /* XOR in 4 bits of data into the extracted bits */ crc32 <<= 4; /* shift the CRC register left 4 bits */ crc32 ^= crc32_lookup[t]; /* do the table lookup and XOR the result */ } return crc32; } /* test if the bootloader is up-to-date, returns 0 if yes, else CRC */ unsigned CheckBootloader(void) { unsigned crc; UINT32* pFlash = (UINT32*)FB; int bootloader_version = FB[BOOT_VERS_ADR]; if (bootloader_version) /* this is a newer image, with a version number */ { if (bootloader_version < LATEST_BOOTLOADER_VERSION) return bootloader_version; else return 0; } /* checksum the bootloader, unfortunately I have no version info yet */ crc = crc_32((unsigned char*)pFlash[2], pFlash[3], -1); /* Here I have to check for ARCHOS_* defines in source code, which is generally strongly discouraged. But here I'm not checking for a certain feature, I'm checking for the model itself. */ #if defined(ARCHOS_PLAYER) if (crc == 0x78DAC94A) return 0; #elif defined(ARCHOS_RECORDER) if (crc == 0xE968702E || crc == 0x7C3D93B4) /* normal or ROMless each */ return 0; #elif defined(ARCHOS_RECORDERV2) if (crc == 0x4511E9B5 || crc == 0x3A93DBDF) return 0; #elif defined(ARCHOS_FMRECORDER) if (crc == 0x4511E9B5 || crc == 0x3A93DBDF) return 0; #endif return crc; } /*********** Image File Functions ************/ /* so far, only compressed images in UCL NRV algorithm 2e supported */ tCheckResult CheckImageFile(char* filename, int space, tImageHeader* pHeader, UINT8* pos) { int i; int fd; int filesize; /* size info */ int fileread = 0; /* total size as read from the file */ int read; /* how many for this sector */ /* magic file header for compressed files */ static const UINT8 magic[8] = { 0x00,0xe9,0x55,0x43,0x4c,0xff,0x01,0x1a }; UINT8 ucl_header[UCL_HEADER]; fd = rb->open(filename, O_RDONLY); if (fd < 0) return eFileNotFound; filesize = rb->filesize(fd); if (filesize - (int)sizeof(ucl_header) - 8 > space) { rb->close(fd); return eTooBig; } else if (filesize < 10000) /* give it some reasonable lower limit */ { rb->close(fd); return eTooSmall; } /* do some sanity checks */ read = rb->read(fd, ucl_header, sizeof(ucl_header)); fileread += read; if (read != sizeof(ucl_header)) { rb->close(fd); return eReadErr; } /* compare the magic header */ for (i=0; i<8; i++) { if (ucl_header[i] != magic[i]) { rb->close(fd); return eNotUCL; } } pHeader->size = Read32(ucl_header + 22); /* compressed size */ if (pHeader->size != filesize - sizeof(ucl_header) - 8) { rb->close(fd); return eMultiBlocks; } /* fill in the hardcoded defaults of the header */ pHeader->destination = ROCKBOX_DEST; pHeader->execute = ROCKBOX_EXEC; if (Read32(ucl_header + 18) > pHeader->size) /* compare with uncompressed size */ { /* compressed, normal case */ pHeader->flags = 0x00000001; /* flags for UCL compressed */ /* check for supported algorithm */ if (ucl_header[12] != 0x2E) { rb->close(fd); return eWrongAlgorithm; } } else { /* uncompressed, either to be copied or run directly in flash */ UINT32 reset_vector; /* image has to start with reset vector */ pHeader->flags = 0x00000000; /* uncompressed */ read = rb->read(fd, &reset_vector, sizeof(reset_vector)); fileread += read; if (read != sizeof(reset_vector)) { rb->close(fd); return eReadErr; } if (reset_vector >= (UINT32)FB && reset_vector < (UINT32)FB+512*1024) /* ROM address? */ { /* assume in-place, executing directly in flash */ pHeader->destination = (UINT32)(pos + sizeof(tImageHeader)); /* for new RomBox, this isn't the reset vector, but the link address, for us to check the position */ if(pHeader->destination != reset_vector) /* compare link addr. */ { rb->close(fd); return eBadRomLink; /* not matching the start address */ } /* read the now following reset vector */ read = rb->read(fd, &reset_vector, sizeof(reset_vector)); fileread += read; if (read != sizeof(reset_vector)) { rb->close(fd); return eReadErr; } } pHeader->execute = reset_vector; } /* check if we can read the whole file */ do { read = rb->read(fd, sector, SECTORSIZE); fileread += read; } while (read == SECTORSIZE); rb->close(fd); if (fileread != filesize) return eReadErr; return eOK; } /* returns the # of failures, 0 on success */ unsigned ProgramImageFile(char* filename, UINT8* pos, tImageHeader* pImageHeader, int start, int size) { int i; int fd; int read; /* how many for this sector */ unsigned failures = 0; fd = rb->open(filename, O_RDONLY); if (fd < 0) return false; /* no error checking necessary here, we checked for minimum size already */ rb->lseek(fd, start, SEEK_SET); /* go to start position */ *(tImageHeader*)sector = *pImageHeader; /* copy header into sector buffer */ read = rb->read(fd, sector + sizeof(tImageHeader), SECTORSIZE - sizeof(tImageHeader)); /* payload behind */ size -= read; read += sizeof(tImageHeader); /* to be programmed, but not part of the file */ do { if (!EraseSector(pos)) { /* nothing we can do, let the programming count the errors */ } for (i=0; iread(fd, sector, (size > SECTORSIZE) ? SECTORSIZE : size); /* payload for next sector */ size -= read; } while (read > 0); rb->close(fd); return failures; } /* returns the # of failures, 0 on success */ unsigned VerifyImageFile(char* filename, UINT8* pos, tImageHeader* pImageHeader, int start, int size) { int i; int fd; int read; /* how many for this sector */ unsigned failures = 0; fd = rb->open(filename, O_RDONLY); if (fd < 0) return false; /* no error checking necessary here, we checked for minimum size already */ rb->lseek(fd, start, SEEK_SET); /* go to start position */ *(tImageHeader*)sector = *pImageHeader; /* copy header into sector buffer */ read = rb->read(fd, sector + sizeof(tImageHeader), SECTORSIZE - sizeof(tImageHeader)); /* payload behind */ size -= read; read += sizeof(tImageHeader); /* to be programmed, but not part of the file */ do { for (i=0; iread(fd, sector, (size > SECTORSIZE) ? SECTORSIZE : size); /* payload for next sector */ size -= read; } while (read); rb->close(fd); return failures; } /***************** User Interface Functions *****************/ int WaitForButton(void) { int button; do { button = rb->button_get(true); } while (button & BUTTON_REL); return button; } /* helper for DoUserDialog() */ void ShowFlashInfo(tFlashInfo* pInfo, tImageHeader* pImageHeader) { char buf[32]; if (!pInfo->manufacturer) { rb->lcd_puts_scroll(0, 0, "Flash: M=?? D=??"); } else { if (pInfo->size) { rb->snprintf(buf, sizeof(buf), "Flash size: %d KB", pInfo->size / 1024); rb->lcd_puts_scroll(0, 0, buf); } else { rb->lcd_puts_scroll(0, 0, "Unsupported chip"); } } if (pImageHeader) { rb->snprintf(buf, sizeof(buf), "Image at %d KB", ((UINT8*)pImageHeader - FB) / 1024); rb->lcd_puts_scroll(0, 1, buf); } else { rb->lcd_puts_scroll(0, 1, "No image found!"); } } /* Kind of our main function, defines the application flow. */ #ifdef HAVE_LCD_BITMAP /* recorder version */ void DoUserDialog(char* filename) { tImageHeader ImageHeader; tFlashInfo FlashInfo; static char buf[MAX_PATH]; int button; int rc; /* generic return code */ UINT32 space, aligned_size, true_size; UINT8* pos; ssize_t memleft; UINT32 crc; bool show_greet = false; /* this can only work if Rockbox runs in DRAM, not flash ROM */ if ((UINT8*)rb >= FB && (UINT8*)rb < FB + 4096*1024) /* 4 MB max */ { /* we're running from flash */ rb->splash(HZ*3, "Not from ROM"); return; /* exit */ } /* refuse to work if the power may fail meanwhile */ if (!rb->battery_level_safe()) { rb->splash(HZ*3, "Battery too low!"); return; /* exit */ } /* "allocate" memory */ sector = rb->plugin_get_buffer((size_t *)&memleft); if (memleft < SECTORSIZE) /* need buffer for a flash sector */ { rb->splash(HZ*3, "Out of memory"); return; /* exit */ } rb->lcd_setfont(FONT_SYSFIXED); pos = (void*)GetSecondImage(); rc = GetFlashInfo(&FlashInfo); ShowFlashInfo(&FlashInfo, (void*)pos); rb->lcd_update(); if (FlashInfo.size == 0) /* no valid chip */ { rb->splash(HZ*3, "Not flashable"); return; /* exit */ } else if (pos == 0) { rb->splash(HZ*3, "No image"); return; /* exit */ } crc = CheckBootloader(); if (crc) /* outdated version found */ { rb->snprintf(buf, sizeof(buf), "(check=0x%08lx)", crc); rb->lcd_puts(0, 0, buf); rb->lcd_puts(0, 1, "Hint: You're not "); rb->lcd_puts(0, 2, "using the latest "); rb->lcd_puts(0, 3, "bootloader. "); rb->lcd_puts(0, 4, "A full reflash is "); rb->lcd_puts(0, 5, "recommended, but "); rb->lcd_puts(0, 6, "not required. "); rb->lcd_puts(0, 7, "Press " KEYNAME1 " to ignore"); rb->lcd_update(); if (WaitForButton() != KEY1) { return; } rb->lcd_clear_display(); } rb->lcd_puts(0, show_greet ? 0 : 3, "Checking..."); rb->lcd_update(); space = FlashInfo.size - (pos-FB + sizeof(ImageHeader)); /* size minus start */ rc = CheckImageFile(filename, space, &ImageHeader, pos); if (rc != eOK) { rb->lcd_clear_display(); /* make room for error message */ show_greet = true; /* verbose */ } rb->lcd_puts(0, show_greet ? 0 : 3, "Checked:"); switch (rc) { case eOK: rb->lcd_puts(0, show_greet ? 0 : 4, "File OK."); break; case eNotUCL: rb->lcd_puts(0, 1, "File not UCL "); rb->lcd_puts(0, 2, "compressed."); rb->lcd_puts(0, 3, "Use uclpack --2e"); rb->lcd_puts(0, 4, " --10 rockbox.bin"); break; case eWrongAlgorithm: rb->lcd_puts(0, 1, "Wrong algorithm"); rb->lcd_puts(0, 2, "for compression."); rb->lcd_puts(0, 3, "Use uclpack --2e"); rb->lcd_puts(0, 4, " --10 rockbox.bin"); break; case eFileNotFound: rb->lcd_puts(0, 1, "File not found:"); rb->lcd_puts_scroll(0, 2, filename); break; case eTooBig: rb->lcd_puts(0, 1, "File too big,"); rb->lcd_puts(0, 2, "won't fit in chip."); break; case eTooSmall: rb->lcd_puts(0, 1, "File too small."); rb->lcd_puts(0, 2, "Incomplete?"); break; case eReadErr: rb->lcd_puts(0, 1, "File read error."); break; case eMultiBlocks: rb->lcd_puts(0, 1, "File invalid."); rb->lcd_puts(0, 2, "Blocksize"); rb->lcd_puts(0, 3, " too small?"); break; case eBadRomLink: rb->lcd_puts(0, 1, "RomBox mismatch."); rb->lcd_puts(0, 2, "Wrong ROM position"); break; default: rb->lcd_puts(0, 1, "Check failed."); break; } if (rc == eOK) { /* was OK */ rb->lcd_puts(0, 6, "[" KEYNAME2 "] to program"); rb->lcd_puts(0, 7, "other key to exit"); } else { /* error occured */ rb->lcd_puts(0, 6, "Any key to exit"); } rb->lcd_update(); button = WaitForButton(); if (rc != eOK || button != KEY2) { return; } true_size = ImageHeader.size; aligned_size = ((sizeof(tImageHeader) + true_size + SECTORSIZE-1) & ~(SECTORSIZE-1)) - sizeof(tImageHeader); /* round up to next flash sector */ ImageHeader.size = aligned_size; /* increase image size such that we reach the next sector */ rb->lcd_clear_display(); rb->lcd_puts_scroll(0, 0, "Programming..."); rb->lcd_update(); rc = ProgramImageFile(filename, pos, &ImageHeader, UCL_HEADER, true_size); if (rc) { /* errors */ rb->lcd_clear_display(); rb->snprintf(buf, sizeof(buf), "%d errors", rc); rb->lcd_puts(0, 0, "Error:"); rb->lcd_puts(0, 1, "Programming fail!"); rb->lcd_puts(0, 2, buf); rb->lcd_update(); button = WaitForButton(); } rb->lcd_clear_display(); rb->lcd_puts_scroll(0, 0, "Verifying..."); rb->lcd_update(); rc = VerifyImageFile(filename, pos, &ImageHeader, UCL_HEADER, true_size); rb->lcd_clear_display(); if (rc == 0) { rb->lcd_puts(0, 0, "Verify OK."); } else { rb->snprintf(buf, sizeof(buf), "%d errors", rc); rb->lcd_puts(0, 0, "Error:"); rb->lcd_puts(0, 1, "Verify fail!"); rb->lcd_puts(0, 2, buf); rb->lcd_puts(0, 3, "Use safe image"); rb->lcd_puts(0, 4, "if booting hangs:"); rb->lcd_puts(0, 5, "F1 during power-on"); } rb->lcd_puts(0, 7, "Any key to exit"); rb->lcd_update(); WaitForButton(); } #else /* #ifdef HAVE_LCD_BITMAP */ /* Player version */ void DoUserDialog(char* filename) { tImageHeader ImageHeader; tFlashInfo FlashInfo; static char buf[MAX_PATH]; int button; int rc; /* generic return code */ UINT32 space, aligned_size, true_size; UINT8* pos; ssize_t memleft; UINT32 crc; /* this can only work if Rockbox runs in DRAM, not flash ROM */ if ((UINT8*)rb >= FB && (UINT8*)rb < FB + 4096*1024) /* 4 MB max */ { /* we're running from flash */ rb->splash(HZ*3, "Not from ROM"); return; /* exit */ } /* refuse to work if the power may fail meanwhile */ if (!rb->battery_level_safe()) { rb->splash(HZ*3, "Batt. too low!"); return; /* exit */ } /* "allocate" memory */ sector = rb->plugin_get_buffer((size_t *)&memleft); if (memleft < SECTORSIZE) /* need buffer for a flash sector */ { rb->splash(HZ*3, "Out of memory"); return; /* exit */ } pos = (void*)GetSecondImage(); rc = GetFlashInfo(&FlashInfo); if (FlashInfo.size == 0) /* no valid chip */ { rb->splash(HZ*3, "Not flashable"); return; /* exit */ } else if (pos == 0) { rb->splash(HZ*3, "No image"); return; /* exit */ } crc = CheckBootloader(); if (crc) /* outdated version found */ { rb->lcd_puts_scroll(0, 0, "Hint: You're not using the latest bootloader. A full reflash is recommended, but not required."); rb->lcd_puts_scroll(0, 1, "Press [Menu] to ignore"); rb->lcd_update(); if (WaitForButton() != BUTTON_MENU) { return; } rb->lcd_clear_display(); } rb->lcd_puts(0, 0, "Checking..."); rb->lcd_update(); space = FlashInfo.size - (pos-FB + sizeof(ImageHeader)); /* size minus start */ rc = CheckImageFile(filename, space, &ImageHeader, pos); rb->lcd_puts(0, 0, "Checked:"); switch (rc) { case eOK: rb->lcd_puts(0, 1, "File OK."); rb->sleep(HZ*1); break; case eNotUCL: rb->lcd_puts_scroll(0, 1, "File not UCL compressed."); break; case eWrongAlgorithm: rb->lcd_puts_scroll(0, 1, "Wrong compression algorithm."); break; case eFileNotFound: rb->lcd_puts_scroll(0, 1, "File not found."); break; case eTooBig: rb->lcd_puts_scroll(0, 1, "File too big."); break; case eTooSmall: rb->lcd_puts_scroll(0, 1, "File too small. Incomplete?"); break; case eReadErr: rb->lcd_puts_scroll(0, 1, "File read error."); break; case eMultiBlocks: rb->lcd_puts_scroll(0, 1, "File invalid. Blocksize too small?"); break; case eBadRomLink: rb->lcd_puts_scroll(0, 1, "BootBox mismatch"); break; default: rb->lcd_puts_scroll(0, 1, "Check failed."); break; } rb->lcd_update(); if (rc == eOK) { /* was OK */ rb->lcd_clear_display(); rb->lcd_puts_scroll(0, 0, "[ON] to program,"); rb->lcd_puts_scroll(0, 1, "other key to exit."); } else { /* error occured */ WaitForButton(); rb->lcd_clear_display(); rb->lcd_puts_scroll(0, 0, "Flash failed."); rb->lcd_puts_scroll(0, 1, "Any key to exit."); } rb->lcd_update(); button = WaitForButton(); if (rc != eOK || button != BUTTON_ON) { return; } true_size = ImageHeader.size; aligned_size = ((sizeof(tImageHeader) + true_size + SECTORSIZE-1) & ~(SECTORSIZE-1)) - sizeof(tImageHeader); /* round up to next flash sector */ ImageHeader.size = aligned_size; /* increase image size such that we reach the next sector */ rb->lcd_clear_display(); rb->lcd_puts_scroll(0, 0, "Programming..."); rb->lcd_update(); rc = ProgramImageFile(filename, pos, &ImageHeader, UCL_HEADER, true_size); if (rc) { /* errors */ rb->lcd_clear_display(); rb->snprintf(buf, sizeof(buf), "%d errors", rc); rb->lcd_puts_scroll(0, 0, "Programming failed!"); rb->lcd_puts_scroll(0, 1, buf); rb->lcd_update(); button = WaitForButton(); } rb->lcd_clear_display(); rb->lcd_puts_scroll(0, 0, "Verifying..."); rb->lcd_update(); rc = VerifyImageFile(filename, pos, &ImageHeader, UCL_HEADER, true_size); rb->lcd_clear_display(); if (rc == 0) { rb->lcd_puts(0, 0, "Verify OK."); rb->lcd_update(); } else { rb->snprintf(buf, sizeof(buf), "Verify fail! %d errors", rc); rb->lcd_puts_scroll(0, 0, buf); rb->lcd_puts_scroll(0, 1, "Use safe image if booting hangs: [-] during power-on"); rb->lcd_update(); button = WaitForButton(); } } #endif /* not HAVE_LCD_BITMAP */ /***************** Plugin Entry Point *****************/ enum plugin_status plugin_start(const struct plugin_api* api, const void* parameter) { int oldmode; rb = api; /* copy to global api pointer */ if (parameter == NULL) { rb->splash(HZ*3, "Play .ucl file!"); return PLUGIN_OK; } /* now go ahead and have fun! */ oldmode = rb->system_memory_guard(MEMGUARD_NONE); /*disable memory guard */ DoUserDialog((char*) parameter); rb->system_memory_guard(oldmode); /* re-enable memory guard */ return PLUGIN_OK; } #endif /* SH-target */ href='#n809'>809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 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/*
  C source for CHESS.

  Revision: 5-23-88

  Copyright (C) 1986, 1987, 1988 Free Software Foundation, Inc.
  Copyright (c) 1988  John Stanback

  This file is part of CHESS.

  CHESS is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY.  No author or distributor
  accepts responsibility to anyone for the consequences of using it
  or for whether it serves any particular purpose or works at all,
  unless he says so in writing.  Refer to the CHESS General Public
  License for full details.

  Everyone is granted permission to copy, modify and redistribute
  CHESS, but only under the conditions described in the
  CHESS General Public License.   A copy of this license is
  supposed to have been given to you along with CHESS so you
  can know your rights and responsibilities.  It should be in a
  file named COPYING.  Among other things, the copyright notice
  and this notice must be preserved on all copies.
*/

#include "plugin.h"

#include "gnuchess.h"
#include "opening.h"

#include <ctype.h>

#define ttblsz 4096

#define ctlP 0x4000
#define ctlN 0x2800
#define ctlB 0x1800
#define ctlR 0x0400
#define ctlQ 0x0200
#define ctlK 0x0100
#define ctlBQ 0x1200
#define ctlRQ 0x0600
#define ctlNN 0x2000
#define pxx " PNBRQK"
#define qxx " pnbrqk"
#define rxx "12345678"
#define cxx "abcdefgh"
#define check 0x0001
#define capture 0x0002
#define draw 0x0004
#define promote 0x0008
#define cstlmask 0x0010
#define epmask 0x0020
#define exact 0x0040
#define pwnthrt 0x0080
#define truescore 0x0001
#define lowerbound 0x0002
#define upperbound 0x0004
#define maxdepth 30
#define true 1
#define false 0
#define absv(x) ((x) < 0 ? -(x) : (x))
#define taxicab(a,b) (abs(column[a]-column[b]) + abs(row[a]-row[b]))

/* ---- RockBox datatypes and variables */
struct plugin_api* rb;

/* ---- Chess datatypes and variables ---- */
struct leaf
  {
    short f,t,score,reply;
    unsigned short flags;
  };
struct BookEntry
  {
    struct BookEntry *next;
    unsigned short *mv;
  };
struct hashval
  {
    unsigned long bd;
    unsigned short key;
  };
struct hashentry
  {
    unsigned long hashbd;
    unsigned short mv,flags;
    short score,depth;
  };

char mvstr1[5],mvstr2[5],mvstr3[6];
struct leaf Tree[1500],*root;
short TrPnt[maxdepth],board[64],color[64];
short row[64],column[64],locn[8][8],Pindex[64],svalue[64];
short PieceList[2][16],PieceCnt[2],atak[2][64],PawnCnt[2][8];
short castld[2],kingmoved[2],mtl[2],pmtl[2],emtl[2],hung[2];
short c1,c2,*atk1,*atk2,*PC1,*PC2,EnemyKing;
short mate,post,opponent,computer,Sdepth,Awindow,Bwindow,dither;
bool withbook ;
long ResponseTime,ExtraTime,Level,et,et0,time0,cputimer,ft;
long NodeCnt,evrate,ETnodes,EvalNodes,HashCnt;
short quit,reverse,bothsides,hashflag,InChk,player,force,easy,beep;
short wking,bking,FROMsquare,TOsquare,timeout,Zscore,zwndw,xwndw,slk;
short INCscore;
short HasPawn[2],HasKnight[2],HasBishop[2],HasRook[2],HasQueen[2];
short ChkFlag[maxdepth],CptrFlag[maxdepth],PawnThreat[maxdepth];
short Pscore[maxdepth],Tscore[maxdepth],Threat[maxdepth];
struct GameRec GameList[240];
short GameCnt,Game50,epsquare,lpost,rcptr,contempt;
short MaxSearchDepth,Xscore;
struct TimeControlRec TimeControl;
short TCflag,TCmoves,TCminutes,OperatorTime;
short otherside[3]={1,0,2};
short rank7[3]={6,1,0};
short map[64]=
   {0,1,2,3,4,5,6,7,
    0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,
    0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27,
    0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,
    0x40,0x41,0x42,0x43,0x44,0x45,0x46,0x47,
    0x50,0x51,0x52,0x53,0x54,0x55,0x56,0x57,
    0x60,0x61,0x62,0x63,0x64,0x65,0x66,0x67,
    0x70,0x71,0x72,0x73,0x74,0x75,0x76,0x77};
short unmap[120]=
   {0,1,2,3,4,5,6,7,-1,-1,-1,-1,-1,-1,-1,-1,
    8,9,10,11,12,13,14,15,-1,-1,-1,-1,-1,-1,-1,-1,
    16,17,18,19,20,21,22,23,-1,-1,-1,-1,-1,-1,-1,-1,
    24,25,26,27,28,29,30,31,-1,-1,-1,-1,-1,-1,-1,-1,
    32,33,34,35,36,37,38,39,-1,-1,-1,-1,-1,-1,-1,-1,
    40,41,42,43,44,45,46,47,-1,-1,-1,-1,-1,-1,-1,-1,
    48,49,50,51,52,53,54,55,-1,-1,-1,-1,-1,-1,-1,-1,
    56,57,58,59,60,61,62,63};
short Dcode[120]= 
   {0,1,1,1,1,1,1,1,0,0,0,0,0,0,0x0E,0x0F,
    0x10,0x11,0x12,0,0,0,0,0,0,0,0,0,0,0,0x0F,0x1F,
    0x10,0x21,0x11,0,0,0,0,0,0,0,0,0,0,0x0F,0,0,
    0x10,0,0,0x11,0,0,0,0,0,0,0,0,0x0F,0,0,0,
    0x10,0,0,0,0x11,0,0,0,0,0,0,0x0F,0,0,0,0,
    0x10,0,0,0,0,0x11,0,0,0,0,0x0F,0,0,0,0,0,
    0x10,0,0,0,0,0,0x11,0,0,0x0F,0,0,0,0,0,0,
    0x10,0,0,0,0,0,0,0x11};
short Stboard[64]=
   {rook,knight,bishop,queen,king,bishop,knight,rook,
    pawn,pawn,pawn,pawn,pawn,pawn,pawn,pawn,
    0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
    pawn,pawn,pawn,pawn,pawn,pawn,pawn,pawn,
    rook,knight,bishop,queen,king,bishop,knight,rook};
short Stcolor[64]=
   {white,white,white,white,white,white,white,white,
    white,white,white,white,white,white,white,white,
    2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
    black,black,black,black,black,black,black,black,
    black,black,black,black,black,black,black,black};
short sweep[7]= {false,false,false,true,true,true,false};
short Dpwn[3]={4,6,0};
short Dstart[7]={6,4,8,4,0,0,0};
short Dstop[7]={7,5,15,7,3,7,7};
short Dir[16]={1,0x10,-1,-0x10,0x0F,0x11,-0x0F,-0x11,
               0x0E,-0x0E,0x12,-0x12,0x1F,-0x1F,0x21,-0x21};
short Pdir[34]={0,0x38,0,0,0,0,0,0,0,0,0,0,0,0,0x02,0x35,
                0x38,0x35,0x02,0,0,0,0,0,0,0,0,0,0,0,0,0x02,
                0,0x02};
short pbit[7]={0,0x01,0x02,0x04,0x08,0x10,0x20};
unsigned short killr0[maxdepth],killr1[maxdepth],killr2[maxdepth];
unsigned short killr3[maxdepth],PrVar[maxdepth];
unsigned short PV,hint,Swag0,Swag1,Swag2,Swag3,Swag4;
unsigned short hashkey;
unsigned long hashbd;
struct hashval hashcode[2][7][64];
struct hashentry ttable[ttblsz];
struct hashentry *ptbl;
unsigned char history[8192];

short Mwpawn[64],Mbpawn[64],Mknight[2][64],Mbishop[2][64];
short Mking[2][64],Kfield[2][64];
short value[7]={0,valueP,valueN,valueB,valueR,valueQ,valueK};
short control[7]={0,ctlP,ctlN,ctlB,ctlR,ctlQ,ctlK};
short PassedPawn0[8]={0,60,80,120,200,360,600,800};
short PassedPawn1[8]={0,30,40,60,100,180,300,800};
short PassedPawn2[8]={0,15,25,35,50,90,140,800};
short PassedPawn3[8]={0,5,10,15,20,30,140,800};
short ISOLANI[8] = {-12,-16,-20,-24,-24,-20,-16,-12};
short BACKWARD[8] = {-6,-10,-15,-21,-28,-28,-28,-28};
short BMBLTY[14] = {-2,0,2,4,6,8,10,12,13,14,15,16,16,16};
short RMBLTY[14] = {0,2,4,6,8,10,11,12,13,14,14,14,14,14};
short Kthreat[16] = {0,-8,-20,-36,-52,-68,-80,-80,-80,-80,-80,-80,
                     -80,-80,-80,-80};
short KNIGHTPOST,KNIGHTSTRONG,BISHOPSTRONG,KATAK,KBNKsq;
short PEDRNK2B,PWEAKH,PADVNCM,PADVNCI,PAWNSHIELD,PDOUBLED,PBLOK;
short RHOPN,RHOPNX,KHOPN,KHOPNX,KSFTY;
short ATAKD,HUNGP,HUNGX,KCASTLD,KMOVD,XRAY,PINVAL;
short stage,stage2,Zwmtl,Zbmtl,Developed[2],PawnStorm;
short PawnBonus,BishopBonus,RookBonus;
short KingOpening[64]=
   {  0,  0, -4,-10,-10, -4,  0,  0,
     -4, -4, -8,-12,-12, -8, -4, -4,
    -12,-16,-20,-20,-20,-20,-16,-12,
    -16,-20,-24,-24,-24,-24,-20,-16,
    -16,-20,-24,-24,-24,-24,-20,-16,
    -12,-16,-20,-20,-20,-20,-16,-12,
     -4, -4, -8,-12,-12, -8, -4, -4,
      0,  0, -4,-10,-10, -4,  0,  0};
short KingEnding[64]=
   { 0, 4, 8,12,12, 8, 4, 0,
     4,16,20,24,24,20,16, 4,
     8,20,28,32,32,28,20, 8,
    12,24,32,36,36,32,24,12,
    12,24,32,36,36,32,24,12,
     8,20,28,32,32,28,20, 8,
     4,16,20,24,24,20,16, 4,
     0, 4, 8,12,12, 8, 4, 0};
short KBNK[64]=
   {99,90,80,70,60,50,40,40,
    90,80,60,50,40,30,20,40,
    80,60,40,30,20,10,30,50,
    70,50,30,10, 0,20,40,60,
    60,40,20, 0,10,30,50,70,
    50,30,10,20,30,40,60,80,
    40,20,30,40,50,60,80,90,
    40,40,50,60,70,80,90,99};
short pknight[64]=
   { 0, 4, 8,10,10, 8, 4, 0,
     4, 8,16,20,20,16, 8, 4,
     8,16,24,28,28,24,16, 8,
    10,20,28,32,32,28,20,10,
    10,20,28,32,32,28,20,10,
     8,16,24,28,28,24,16, 8,
     4, 8,16,20,20,16, 8, 4,
     0, 4, 8,10,10, 8, 4, 0};
short pbishop[64]=
   {14,14,14,14,14,14,14,14,
    14,22,18,18,18,18,22,14,
    14,18,22,22,22,22,18,14,
    14,18,22,22,22,22,18,14,
    14,18,22,22,22,22,18,14,
    14,18,22,22,22,22,18,14,
    14,22,18,18,18,18,22,14,
    14,14,14,14,14,14,14,14};
short PawnAdvance[64]=
   { 0, 0, 0, 0, 0, 0, 0, 0,
     4, 4, 4, 0, 0, 4, 4, 4,
     6, 8, 2,10,10, 2, 8, 6,
     6, 8,12,16,16,12, 8, 6,
     8,12,16,24,24,16,12, 8,
    12,16,24,32,32,24,16,12,
    12,16,24,32,32,24,16,12,
     0, 0, 0, 0, 0, 0, 0, 0};
     
/* ............ prototypes ............ */
void ScorePosition( short side, short *score );
void ScoreLoneKing( short side, short *score );
int  ScoreKPK( short side, short winner, short loser,
	 		   short king1, short king2, short sq );
int  ScoreKBNK( short winner, short king1, short king2 );
int  SqValue( short sq, short side );
void KingScan( short sq, short *s );
void BRscan( short sq, short *s, short *mob );
int  trapped( short sq, short piece );
void ExaminePosition( void );
void UpdateWeights( void );
int  distance( short a, short b );
void BlendBoard( short a[64] , short b[64] , short c[64] );
void CopyBoard( short a[64] , short b[64] );

void OpeningBook ( void );
int  search ( short side, short ply, short depth,
              short alpha, short beta,
			  unsigned short bstline[], short *rpt,
              void (*callback)(void) );
int  evaluate ( short side, short xside, short ply, short depth,
                short alpha, short beta );
int  ProbeTTable ( short side, short depth,
                   short *alpha, short *beta, short *score);
void PutInTTable ( short side, short score, short depth,
                   short alpha, short beta, unsigned short mv );
void ZeroTTable ( void );
void MoveList ( short side, short ply );
 
void GenMoves ( short ply, short sq, short side, short xside );
void LinkMove ( short ply, short f, short t, short xside );
void CaptureList ( short side, short xside, short ply );
int  castle ( short side, short kf, short kt, short iop );
void EnPassant ( short xside, short f, short t, short iop );
void MakeMove ( short side, struct leaf *node,
	            short *tempb, short *tempc, short *tempsf, short *tempst );
void UnmakeMove ( short side, struct leaf *node,
	              short *tempb, short *tempc, short *tempsf, short *tempst );
void UpdateHashbd ( short side, short piece, short f, short t );
void UpdatePieceList ( short side, short sq, short iop );
void InitializeStats ( void );
void pick ( short p1, short p2 );
void repetition ( short *cnt );
int  SqAtakd ( short sq, short side );
void ataks ( short side, short *a );

void algbr ( short f, short t, short flag );
void ElapsedTime( short iop);

void NewGame(void); 


/* ............    POSITIONAL EVALUATION ROUTINES    ............ */

	 
void ScorePosition(side,score)
short side,*score;

/*
   Perform normal static evaluation of board position. A score is 
   generated for each piece and these are summed to get a score for each 
   side. 
*/

{
register short sq,s,i,xside;
short pscore[3];

  wking = PieceList[white][0]; bking = PieceList[black][0];
  UpdateWeights();
  xside = otherside[side];
  pscore[white] = pscore[black] = 0;

  for (c1 = white; c1 <= black; c1++)
    {
      c2 = otherside[c1];
      if (c1 == white) EnemyKing = bking; else EnemyKing = wking;
      atk1 = atak[c1]; atk2 = atak[c2];
      PC1 = PawnCnt[c1]; PC2 = PawnCnt[c2];
      for (i = 0; i <= PieceCnt[c1]; i++)
        {
          sq = PieceList[c1][i];
          s = SqValue(sq,side);
          pscore[c1] += s;
          svalue[sq] = s;
        }
    }
  if (hung[side] > 1) pscore[side] += HUNGX;
  if (hung[xside] > 1) pscore[xside] += HUNGX;
  
  *score = mtl[side] - mtl[xside] + pscore[side] - pscore[xside] + 10;
  if (dither) *score += rb->rand() % dither;
  
  if (*score > 0 && pmtl[side] == 0) {
    if (emtl[side] < valueR) {
		*score = 0;
    } else {
		if (*score < valueR) *score /= 2;
	}
  }
  if (*score < 0 && pmtl[xside] == 0) {
    if (emtl[xside] < valueR) {
		*score = 0;
    } else {
		if (-*score < valueR) *score /= 2;
		}
  }
  
  if (mtl[xside] == valueK && emtl[side] > valueB) *score += 200;
  if (mtl[side] == valueK && emtl[xside] > valueB) *score -= 200;
}


void ScoreLoneKing(side,score)
short side,*score;

/* 
   Static evaluation when loser has only a king and winner has no pawns
   or no pieces.
*/

{
register short winner,loser,king1,king2,s,i;

  UpdateWeights();
  if (mtl[white] > mtl[black]) winner = white; else winner = black;
  loser = otherside[winner];
  king1 = PieceList[winner][0]; king2 = PieceList[loser][0];
  
  s = 0;
  
  if (pmtl[winner] > 0)
    for (i = 1; i <= PieceCnt[winner]; i++)
      s += ScoreKPK(side,winner,loser,king1,king2,PieceList[winner][i]);
      
  else if (emtl[winner] == valueB+valueN)
    s = ScoreKBNK(winner,king1,king2);
    
  else if (emtl[winner] > valueB)
    s = 500 + emtl[winner] - 2*KingEnding[king2] - 2*distance(king1,king2);
    
  if (side == winner) *score = s; else *score = -s;
}


int ScoreKPK(side,winner,loser,king1,king2,sq)
short side,winner,loser,king1,king2,sq;

/*
   Score King and Pawns versus King endings.
*/

{
register short s,r;
  
  if (PieceCnt[winner] == 1) s = 50; else s = 120;
  if (winner == white)
    {
      if (side == loser) r = row[sq]-1; else r = row[sq];
      if (row[king2] >= r && distance(sq,king2) < 8-r) s += 10*row[sq];
      else s = 500+50*row[sq];
      if (row[sq] < 6) sq += 16; else sq += 8;
    }
  else
    {
      if (side == loser) r = row[sq]+1; else r = row[sq];
      if (row[king2] <= r && distance(sq,king2) < r+1) s += 10*(7-row[sq]);
      else s = 500+50*(7-row[sq]);
      if (row[sq] > 1) sq -= 16; else sq -= 8;
    }
  s += 8*(taxicab(king2,sq) - taxicab(king1,sq));
  return(s);
}


int ScoreKBNK(winner,king1,king2)
short winner,king1,king2;

/*
   Score King+Bishop+Knight versus King endings.
   This doesn't work all that well but it's better than nothing.
*/

{
register short s;
  s = emtl[winner] - 300;
  if (KBNKsq == 0) s += KBNK[king2];
  else s += KBNK[locn[row[king2]][7-column[king2]]];
  s -= taxicab(king1,king2);
  s -= distance(PieceList[winner][1],king2);
  s -= distance(PieceList[winner][2],king2);
  return(s);
}


int SqValue(sq,side)
short sq,side;

/*
   Calculate the positional value for the piece on 'sq'.
*/

{
register short j,fyle,rank,a1,a2;
short s,piece,in_square,r,mob,e,c;

  piece = board[sq];
  a1 = (atk1[sq] & 0x4FFF); a2 = (atk2[sq] & 0x4FFF);
  rank = row[sq]; fyle = column[sq];
  s = 0;
  if (piece == pawn && c1 == white)
    {
      s = Mwpawn[sq];
      if (sq == 11 || sq == 12)
        if (color[sq+8] != neutral) s += PEDRNK2B;
      if ((fyle == 0 || PC1[fyle-1] == 0) &&
          (fyle == 7 || PC1[fyle+1] == 0))
        s += ISOLANI[fyle];
      else if (PC1[fyle] > 1) s += PDOUBLED;
      if (a1 < ctlP && atk1[sq+8] < ctlP)
        {
          s += BACKWARD[a2 & 0xFF];
          if (PC2[fyle] == 0) s += PWEAKH;
          if (color[sq+8] != neutral) s += PBLOK;
        }
      if (PC2[fyle] == 0)
        {
          if (side == black) r = rank-1; else r = rank;
          in_square = (row[bking] >= r && distance(sq,bking) < 8-r);
          if (a2 == 0 || side == white) e = 0; else e = 1;
          for (j = sq+8; j < 64; j += 8)
            if (atk2[j] >= ctlP) { e = 2; break; }
            else if (atk2[j] > 0 || color[j] != neutral) e = 1;
          if (e == 2) s += (stage*PassedPawn3[rank]) / 10;
          else if (in_square || e == 1) s += (stage*PassedPawn2[rank]) / 10;
          else if (emtl[black] > 0) s += (stage*PassedPawn1[rank]) / 10;
          else s += PassedPawn0[rank];
        }
    }
  else if (piece == pawn && c1 == black)
    {
      s = Mbpawn[sq];
      if (sq == 51 || sq == 52)
        if (color[sq-8] != neutral) s += PEDRNK2B;
      if ((fyle == 0 || PC1[fyle-1] == 0) &&
          (fyle == 7 || PC1[fyle+1] == 0))
        s += ISOLANI[fyle];
      else if (PC1[fyle] > 1) s += PDOUBLED;
      if (a1 < ctlP && atk1[sq-8] < ctlP)
        {
          s += BACKWARD[a2 & 0xFF];
          if (PC2[fyle] == 0) s += PWEAKH;
          if (color[sq-8] != neutral) s += PBLOK;
        }
      if (PC2[fyle] == 0)
        {
          if (side == white) r = rank+1; else r = rank;
          in_square = (row[wking] <= r && distance(sq,wking) < r+1);
          if (a2 == 0 || side == black) e = 0; else e = 1;
          for (j = sq-8; j >= 0; j -= 8)
            if (atk2[j] >= ctlP) { e = 2; break; }
            else if (atk2[j] > 0 || color[j] != neutral) e = 1;
          if (e == 2) s += (stage*PassedPawn3[7-rank]) / 10;
          else if (in_square || e == 1) s += (stage*PassedPawn2[7-rank]) / 10;
          else if (emtl[white] > 0) s += (stage*PassedPawn1[7-rank]) / 10;
          else s += PassedPawn0[7-rank];
        }
    }
  else if (piece == knight)
    {
      s = Mknight[c1][sq];
    }
  else if (piece == bishop)
    {
      s = Mbishop[c1][sq];
      BRscan(sq,&s,&mob);
      s += BMBLTY[mob];
    }
  else if (piece == rook)
    {
      s += RookBonus;
      BRscan(sq,&s,&mob);
      s += RMBLTY[mob];
      if (PC1[fyle] == 0) s += RHOPN;
      if (PC2[fyle] == 0) s += RHOPNX;
      if (rank == rank7[c1] && pmtl[c2] > 100) s += 10;
      if (stage > 2) s += 14 - taxicab(sq,EnemyKing);
    }
  else if (piece == queen)
    {
      if (stage > 2) s += 14 - taxicab(sq,EnemyKing);
      if (distance(sq,EnemyKing) < 3) s += 12;
    }
  else if (piece == king)
    {
      s = Mking[c1][sq];
      if (KSFTY > 0)
        if (Developed[c2] || stage > 0) KingScan(sq,&s);
      if (castld[c1]) s += KCASTLD;
      else if (kingmoved[c1]) s += KMOVD;

      if (PC1[fyle] == 0) s += KHOPN;
      if (PC2[fyle] == 0) s += KHOPNX;
      if (fyle == 1 || fyle == 2 || fyle == 3 || fyle == 7)
        {
          if (PC1[fyle-1] == 0) s += KHOPN;
          if (PC2[fyle-1] == 0) s += KHOPNX;
        }
      if (fyle == 4 || fyle == 5 || fyle == 6 || fyle == 0)
        {
          if (PC1[fyle+1] == 0) s += KHOPN;
          if (PC2[fyle+1] == 0) s += KHOPNX;
        }
      if (fyle == 2)
        {
          if (PC1[0] == 0) s += KHOPN;
          if (PC2[0] == 0) s += KHOPNX;
        }
      if (fyle == 5)
        {
          if (PC1[7] == 0) s += KHOPN;
          if (PC2[7] == 0) s += KHOPNX;
        }
    }
    
  if (a2 > 0) 
    {
      c = (control[piece] & 0x4FFF);
      if (a1 == 0 || a2 > c+1)
        {
          s += HUNGP;
          ++hung[c1];
          if (piece != king && trapped(sq,piece)) ++hung[c1];
        }
      else if (piece != pawn || a2 > a1)
        if (a2 >= c || a1 < ctlP) s += ATAKD;
    }
  return(s);
}


void KingScan(sq,s)
short sq,*s;

/*
   Assign penalties if king can be threatened by checks, if squares
   near the king are controlled by the enemy (especially the queen),
   or if there are no pawns near the king.
*/

#define ScoreThreat\
  if (color[u] != c2) {\
    if (atk1[u] == 0 || (atk2[u] & 0xFF) > 1) {\
		++cnt;\
	} else {\
		*s -= 3; \
	}\
  }

{
register short m,u,d,i,m0,cnt,ok;

  cnt = 0;
  m0 = map[sq];
  if (HasBishop[c2] || HasQueen[c2])
    for (i = Dstart[bishop]; i <= Dstop[bishop]; i++)
      {
        d = Dir[i]; m = m0+d;
        while (!(m & 0x88))
          {
            u = unmap[m];
            if (atk2[u] & ctlBQ) ScoreThreat
            if (color[u] != neutral) break;
            m += d;
          }
      }
  if (HasRook[c2] || HasQueen[c2])
    for (i = Dstart[rook]; i <= Dstop[rook]; i++)
      {
        d = Dir[i]; m = m0+d;
        while (!(m & 0x88))
          {
            u = unmap[m];
            if (atk2[u] & ctlRQ) ScoreThreat
            if (color[u] != neutral) break;
            m += d;
          }
      }
  if (HasKnight[c2])
    for (i = Dstart[knight]; i <= Dstop[knight]; i++)
      if (!((m = m0+Dir[i]) & 0x88))
        {
          u = unmap[m];
          if (atk2[u] & ctlNN) ScoreThreat
        }
  *s += (KSFTY*Kthreat[cnt]) / 16;

  cnt = 0; ok = false;
  m0 = map[sq];
  for (i = Dstart[king]; i <= Dstop[king]; i++)
    if (!((m = m0+Dir[i]) & 0x88))
      {
        u = unmap[m];
        if (board[u] == pawn) ok = true;
        if (atk2[u] > atk1[u])
          {
            ++cnt;
            if (atk2[u] & ctlQ)
              if (atk2[u] > ctlQ+1 && atk1[u] < ctlQ) *s -= 4*KSFTY;
          }
      }
  if (!ok) *s -= KSFTY;
  if (cnt > 1) *s -= KSFTY;
}


void BRscan(sq,s,mob)
short sq,*s,*mob;

/*
   Find Bishop and Rook mobility, XRAY attacks, and pins. Increment the 
   hung[] array if a pin is found. 
*/

{
register short m,u,d,m0,j,piece,pin;
short *Kf; 

  Kf = Kfield[c1];
  *mob = 0;
  m0 = map[sq]; piece = board[sq];
  for (j = Dstart[piece]; j <= Dstop[piece]; j++)
    {
      pin = -1;
      d = Dir[j]; m = m0+d;
      while (!(m & 0x88))
        {
          u = unmap[m]; *s += Kf[u];
          if (color[u] == neutral)
            {
              (*mob)++;
              m += d;
            }
          else if (pin < 0)
            {
              if (board[u] == pawn || board[u] == king) break;
              pin = u;
              m += d;
            }
          else if (color[u] == c2 && (board[u] > piece || atk2[u] == 0))
            {
              if (color[pin] == c2)
                {
                  *s += PINVAL;
                  if (atk2[pin] == 0 ||
                      atk1[pin] > control[board[pin]]+1)
                    ++hung[c2];
                }
              else *s += XRAY;
              break;
            }
          else break;
        }
    }
}


int trapped(sq,piece)
short sq,piece;

/*
   See if the attacked piece has unattacked squares to move to.
*/

{
register short u,m,d,i,m0;

  m0 = map[sq];
  if (sweep[piece])
    for (i = Dstart[piece]; i <= Dstop[piece]; i++)
      {
        d = Dir[i]; m = m0+d;
        while (!(m & 0x88))
          {
            u = unmap[m];
            if (color[u] == c1) break;
            if (atk2[u] == 0 || board[u] >= piece) return(false);
            if (color[u] == c2) break;
            m += d;
          }
      }
  else if (piece == pawn)
    {
      if (c1 == white) u = sq+8; else u = sq-8;
      if (color[u] == neutral && atk1[u] >= atk2[u])
        return(false);
      if (!((m = m0+Dir[Dpwn[c1]]) & 0x88))
        if (color[unmap[m]] == c2) return(false);
      if (!((m = m0+Dir[Dpwn[c1]+1]) & 0x88))
        if (color[unmap[m]] == c2) return(false);
    }
  else
    {
      for (i = Dstart[piece]; i <= Dstop[piece]; i++)
        if (!((m = m0+Dir[i]) & 0x88))
          {
            u = unmap[m];
            if (color[u] != c1)
              if (atk2[u] == 0 || board[u] >= piece) return(false);
          }
    }
  return(true);
}


void ExaminePosition()

/*
   This is done one time before the search is started. Set up arrays 
   Mwpawn, Mbpawn, Mknight, Mbishop, Mking which are used in the 
   SqValue() function to determine the positional value of each piece. 
*/

{
register short i,sq;
short wpadv,bpadv,wstrong,bstrong,z,side,pp,j,val,Pd,fyle,rank;

  wking = PieceList[white][0]; bking = PieceList[black][0];
  ataks(white,atak[white]); ataks(black,atak[black]);
  Zwmtl = Zbmtl = 0;
  UpdateWeights();
  HasPawn[white] = HasPawn[black] = 0;
  HasKnight[white] = HasKnight[black] = 0;
  HasBishop[white] = HasBishop[black] = 0;
  HasRook[white] = HasRook[black] = 0;
  HasQueen[white] = HasQueen[black] = 0;
  for (side = white; side <= black; side++)
    for (i = 0; i <= PieceCnt[side]; i++)
      switch (board[PieceList[side][i]])
        {
          case pawn : ++HasPawn[side]; break;
          case knight : ++HasKnight[side]; break;
          case bishop : ++HasBishop[side]; break;
          case rook : ++HasRook[side]; break;
          case queen : ++HasQueen[side]; break;
        }
  if (!Developed[white])
    Developed[white] = (board[1] != knight && board[2] != bishop &&
                        board[5] != bishop && board[6] != knight);
  if (!Developed[black])
    Developed[black] = (board[57] != knight && board[58] != bishop &&
                        board[61] != bishop && board[62] != knight);
  if (!PawnStorm && stage < 5)
    PawnStorm = ((column[wking] < 3 && column[bking] > 4) ||
                 (column[wking] > 4 && column[bking] < 3));
  
  CopyBoard(pknight,Mknight[white]);
  CopyBoard(pknight,Mknight[black]);
  CopyBoard(pbishop,Mbishop[white]);
  CopyBoard(pbishop,Mbishop[black]);
  BlendBoard(KingOpening,KingEnding,Mking[white]);
  BlendBoard(KingOpening,KingEnding,Mking[black]);
  
  for (sq = 0; sq < 64; sq++)
    {
      fyle = column[sq]; rank = row[sq];
      wstrong = bstrong = true;
      for (i = sq; i < 64; i += 8)
        if (atak[black][i] >= ctlP) wstrong = false;
      for (i = sq; i >= 0; i -= 8)
        if (atak[white][i] >= ctlP) bstrong = false;
      wpadv = bpadv = PADVNCM;
      if ((fyle == 0 || PawnCnt[white][fyle-1] == 0) &&
          (fyle == 7 || PawnCnt[white][fyle+1] == 0)) wpadv = PADVNCI;
      if ((fyle == 0 || PawnCnt[black][fyle-1] == 0) &&
          (fyle == 7 || PawnCnt[black][fyle+1] == 0)) bpadv = PADVNCI;
      Mwpawn[sq] = (wpadv*PawnAdvance[sq]) / 10;
      Mbpawn[sq] = (bpadv*PawnAdvance[63-sq]) / 10;
      Mwpawn[sq] += PawnBonus; Mbpawn[sq] += PawnBonus;
      if (castld[white] || kingmoved[white])
        {
          if ((fyle < 3 || fyle > 4) && distance(sq,wking) < 3)
            Mwpawn[sq] += PAWNSHIELD;
        }
      else if (rank < 3 && (fyle < 2 || fyle > 5))
        Mwpawn[sq] += PAWNSHIELD / 2;
      if (castld[black] || kingmoved[black])
        {
          if ((fyle < 3 || fyle > 4) && distance(sq,bking) < 3)
            Mbpawn[sq] += PAWNSHIELD;
        }
      else if (rank > 4 && (fyle < 2 || fyle > 5))
        Mbpawn[sq] += PAWNSHIELD / 2;
      if (PawnStorm)
        {
          if ((column[wking] < 4 && fyle > 4) ||
              (column[wking] > 3 && fyle < 3)) Mwpawn[sq] += 3*rank - 21;
          if ((column[bking] < 4 && fyle > 4) ||
              (column[bking] > 3 && fyle < 3)) Mbpawn[sq] -= 3*rank;
        }
        
      Mknight[white][sq] += 5 - distance(sq,bking);
      Mknight[white][sq] += 5 - distance(sq,wking);
      Mknight[black][sq] += 5 - distance(sq,wking);
      Mknight[black][sq] += 5 - distance(sq,bking);
      Mbishop[white][sq] += BishopBonus;
      Mbishop[black][sq] += BishopBonus;
      for (i = 0; i <= PieceCnt[black]; i++)
        if (distance(sq,PieceList[black][i]) < 3)
          Mknight[white][sq] += KNIGHTPOST;
      for (i = 0; i <= PieceCnt[white]; i++)
        if (distance(sq,PieceList[white][i]) < 3)
          Mknight[black][sq] += KNIGHTPOST;
      if (wstrong) Mknight[white][sq] += KNIGHTSTRONG;
      if (bstrong) Mknight[black][sq] += KNIGHTSTRONG;
      if (wstrong) Mbishop[white][sq] += BISHOPSTRONG;
      if (bstrong) Mbishop[black][sq] += BISHOPSTRONG;
      
      if (HasBishop[white] == 2) Mbishop[white][sq] += 8;
      if (HasBishop[black] == 2) Mbishop[black][sq] += 8;
      if (HasKnight[white] == 2) Mknight[white][sq] += 5;
      if (HasKnight[black] == 2) Mknight[black][sq] += 5;
      
      if (board[sq] == bishop) {
        if (rank % 2 == fyle % 2) {
		  KBNKsq = 0;
		} else { 
		  KBNKsq = 7;
        }
	  }
		
      Kfield[white][sq] = Kfield[black][sq] = 0;
      if (distance(sq,wking) == 1) Kfield[black][sq] = KATAK;
      if (distance(sq,bking) == 1) Kfield[white][sq] = KATAK;
      
      Pd = 0;
      for (i = 0; i < 64; i++)
        if (board[i] == pawn)
          {
            if (color[i] == white)
              {
                pp = true;
                if (row[i] == 6) z = i+8; else z = i+16;
                for (j = i+8; j < 64; j += 8)
                  if (atak[black][j] > ctlP || board[j] == pawn) pp = false;
              }
            else
              {
                pp = true;
                if (row[i] == 1) z = i-8; else z = i-16;
                for (j = i-8; j >= 0; j -= 8)
                  if (atak[white][j] > ctlP || board[j] == pawn) pp = false;
              }
            if (pp) Pd += 5*taxicab(sq,z); else Pd += taxicab(sq,z);
          }
      if (Pd != 0)
        {
          val = (Pd*stage2) / 10;
          Mking[white][sq] -= val;
          Mking[black][sq] -= val;
        }
    }
}


void UpdateWeights()

/* 
   If material balance has changed, determine the values for the 
   positional evaluation terms. 
*/

{
register short tmtl;

  if (mtl[white] != Zwmtl || mtl[black] != Zbmtl)
    {
      Zwmtl = mtl[white]; Zbmtl = mtl[black];
      emtl[white] = Zwmtl - pmtl[white] - valueK;
      emtl[black] = Zbmtl - pmtl[black] - valueK;
      tmtl = emtl[white] + emtl[black];
      if (tmtl > 6600) stage = 0;
      else if (tmtl < 1400) stage = 10;
      else stage = (6600-tmtl) / 520;
      if (tmtl > 3600) stage2 = 0;
      else if (tmtl < 1400) stage2 = 10;
      else stage2 = (3600-tmtl) / 220;
      
      PEDRNK2B = -15;         /* centre pawn on 2nd rank & blocked */
      PBLOK = -4;             /* blocked backward pawn */
      PDOUBLED = -14;         /* doubled pawn */
      PWEAKH  = -4;           /* weak pawn on half open file */
      PAWNSHIELD = 10-stage;  /* pawn near friendly king */
      PADVNCM =  10;          /* advanced pawn multiplier */
      PADVNCI = 7;            /* muliplier for isolated pawn */
      PawnBonus = stage;
      
      KNIGHTPOST = (stage+2)/3;   /* knight near enemy pieces */
      KNIGHTSTRONG = (stage+6)/2; /* occupies pawn hole */
      
      BISHOPSTRONG = (stage+6)/2; /* occupies pawn hole */
      BishopBonus = 2*stage;
      
      RHOPN    = 10;          /* rook on half open file */
      RHOPNX   = 4;
      RookBonus = 6*stage;
      
      XRAY     = 8;           /* Xray attack on piece */
      PINVAL   = 10;          /* Pin */
      
      KHOPN    = (3*stage-30) / 2; /* king on half open file */
      KHOPNX   = KHOPN / 2;
      KCASTLD  = 10 - stage;
      KMOVD    = -40 / (stage+1);  /* king moved before castling */
      KATAK    = (10-stage) / 2;   /* B,R attacks near enemy king */
      if (stage < 8) KSFTY = 16-2*stage; else KSFTY = 0;
      
      ATAKD    = -6;          /* defender > attacker */
      HUNGP    = -8;          /* each hung piece */
      HUNGX    = -12;         /* extra for >1 hung piece */
    }
}


int distance(a,b)
short a,b;
{
register short d1,d2;

  d1 = abs(column[a]-column[b]);
  d2 = abs(row[a]-row[b]);
  if (d1 > d2) return(d1); else return(d2);
}


void BlendBoard(a,b,c)
short a[64],b[64],c[64];
{
register int sq;
  for (sq = 0; sq < 64; sq++)
    c[sq] = (a[sq]*(10-stage) + b[sq]*stage) / 10;
}


void CopyBoard(a,b)
short a[64],b[64];
{
register int sq;
  for (sq = 0; sq < 64; sq++)
    b[sq] = a[sq];
}

/* ............    MOVE GENERATION & SEARCH ROUTINES    .............. */


int SelectMove( short side, short iop , void (*callback)(void))

/*
   Select a move by calling function search() at progressively deeper 
   ply until time is up or a mate or draw is reached. An alpha-beta 
   window of -90 to +90 points is set around the score returned from the 
   previous iteration. If Sdepth != 0 then the program has correctly 
   predicted the opponents move and the search will start at a depth of 
   Sdepth+1 rather than a depth of 1. 
*/

{
static short i,alpha,beta,score,tempb,tempc,tempsf,tempst,xside,rpt;

  timeout = false;
  xside = otherside[side];
  if (iop != 2) player = side;
  if (TCflag)
    {
      ResponseTime = (TimeControl.clock[side]) /
                     (TimeControl.moves[side] + 3) -
                     OperatorTime;
      ResponseTime += (ResponseTime*TimeControl.moves[side])/(2*TCmoves+1);
    }
  else ResponseTime = Level;
  if (iop == 2) ResponseTime = 999;
  if (Sdepth > 0 && root->score > Zscore-zwndw) ResponseTime -= ft;
  else if (ResponseTime < 1) ResponseTime = 1;
  ExtraTime = 0;
  ExaminePosition();
  ScorePosition(side,&score);
  Pscore[0] = -score;
  
  if (Sdepth == 0)
  {
    ZeroTTable();
    /*SearchStartStuff(side);*/
    for (i = 0; i < 8192; i++) history[i] = 0;
    FROMsquare = TOsquare = -1;
    PV = 0;
    if (iop != 2) hint = 0;
    for (i = 0; i < maxdepth; i++)
     PrVar[i] = killr0[i] = killr1[i] = killr2[i] = killr3[i] = 0;
     
    alpha = -9000; beta = 9000;
    rpt = 0;
    TrPnt[1] = 0; root = &Tree[0];
    MoveList(side,1);
    for (i = TrPnt[1]; i < TrPnt[2]; i++) pick(i,TrPnt[2]-1);
    if (withbook) OpeningBook();
    if (withbook) timeout = true;
    NodeCnt = ETnodes = EvalNodes = HashCnt = 0;
    Zscore = 0; zwndw = 20;
  }
  
  while (!timeout && Sdepth < MaxSearchDepth)
    {
      Sdepth++;
      /*ShowDepth(' ');*/
      score = search(side,1,Sdepth,alpha,beta,PrVar,&rpt,callback);
      for (i = 1; i <= Sdepth; i++) killr0[i] = PrVar[i];
      if (score < alpha && !timeout)
        {
          /*ShowDepth('-');*/
          ExtraTime = 10*ResponseTime;
          ZeroTTable();
          score = search(side,1,Sdepth,-9000,beta,PrVar,&rpt,callback);
        }
      if (score > beta && !timeout && !(root->flags & exact))
        {
          /*ShowDepth('+');*/
          ExtraTime = 0;
          ZeroTTable();
          score = search(side,1,Sdepth,alpha,9000,PrVar,&rpt,callback);
        }
      score = root->score;
      if (!timeout)
        for (i = TrPnt[1]+1; i < TrPnt[2]; i++) pick(i,TrPnt[2]-1);
      /*ShowResults(score,PrVar,'.');*/
      for (i = 1; i <= Sdepth; i++) killr0[i] = PrVar[i];
      if (score > Zscore-zwndw && score > Tree[1].score+250) ExtraTime = 0;
      else if (score > Zscore-3*zwndw) ExtraTime = ResponseTime;
      else ExtraTime = 3*ResponseTime;
      if (root->flags & exact) timeout = true;
      if (Tree[1].score < -9000) timeout = true;
      if (4*et > 2*ResponseTime + ExtraTime) timeout = true;
      if (!timeout)
        {
          Tscore[0] = score;
          if (Zscore == 0) Zscore = score;
          else Zscore = (Zscore+score)/2;
        }
      zwndw = 20+abs(Zscore/12);
      beta = score + Bwindow;
      if (Zscore < score) alpha = Zscore - Awindow - zwndw;
      else alpha = score - Awindow - zwndw;
    }

  score = root->score;
  if (rpt >= 2 || score < -12000) root->flags |= draw;
  if (iop == 2) return(0);
  if (!withbook) hint = PrVar[2];
  ElapsedTime(1);

  if (score > -9999 && rpt <= 2)
    {
      MakeMove(side,root,&tempb,&tempc,&tempsf,&tempst);
      algbr(root->f,root->t,root->flags & cstlmask);
    }
  else mvstr1[0] = '\0';
  /*OutputMove();*/
  if (score == -9999 || score == 9998) mate = true;
  if (mate) hint = 0;
  if (root->flags & cstlmask) Game50 = GameCnt;
  else if (board[root->t] == pawn || (root->flags & capture)) 
    Game50 = GameCnt;
  GameList[GameCnt].score = score;
  GameList[GameCnt].nodes = NodeCnt;
  GameList[GameCnt].time = (short)et;
  GameList[GameCnt].depth = Sdepth;
  if (TCflag)
    {
      TimeControl.clock[side] -= (et + OperatorTime);
      if (--TimeControl.moves[side] == 0) SetTimeControl();
    }
  if ((root->flags & draw) && bothsides) quit = true;
  if (GameCnt > 238) quit = true;
  player = xside;
  Sdepth = 0;
  return(0);
}


void OpeningBook()

/*
   Go thru each of the opening lines of play and check for a match with 
   the current game listing. If a match occurs, generate a random number. 
   If this number is the largest generated so far then the next move in 
   this line becomes the current "candidate". After all lines are 
   checked, the candidate move is put at the top of the Tree[] array and 
   will be played by the program. Note that the program does not handle 
   book transpositions. 
*/

{
  short j,pnt;
  unsigned short m;
  unsigned r,r0;
  int o_c=0 , m_c=0 ;

  rb->srand ( *rb->current_tick ) ;
  r0 = 0;
  m = 0;
  while ( o_c < MAX_OPENING )  {
      m_c = 0 ;
      for (j = 0; j <= GameCnt; j++) {
        if ( GameList[j].gmove != OBook[o_c][m_c] ) break;
        m_c++;
      }
      /* I added ( m != OBook[o_c][m_c] ) trying to get more random games */
      if ( ( j > GameCnt ) && ( m != OBook[o_c][m_c] ) ) {
          r=rb->rand();
          if ( r > r0 ) {
                  r0 = r; m = OBook[o_c][m_c];
                  hint = OBook[o_c][m_c+1];
          }
      }
      o_c++;
    }

  for (pnt = TrPnt[1]; pnt < TrPnt[2]; pnt++)
    if ((Tree[pnt].f<<8) + Tree[pnt].t == m) Tree[pnt].score = 0;
  pick(TrPnt[1],TrPnt[2]-1);
  if (Tree[TrPnt[1]].score < 0) withbook = false;
}


#define UpdateSearchStatus \
{\
  if (pnt > TrPnt[1])\
    {\
      d = best-Zscore; e = best-node->score;\
      if (best < alpha) ExtraTime = 10*ResponseTime;\
      else if (d > -zwndw && e > 4*zwndw) ExtraTime = -ResponseTime/3;\
      else if (d > -zwndw) ExtraTime = 0;\
      else if (d > -3*zwndw) ExtraTime = ResponseTime;\
      else if (d > -9*zwndw) ExtraTime = 3*ResponseTime;\
      else ExtraTime = 5*ResponseTime;\
    }\
}

int search( short side, short ply, short depth,
            short alpha, short beta, unsigned short bstline[], short *rpt,
            void (*callback)(void) )

/*
   Perform an alpha-beta search to determine the score for the current 
   board position. If depth <= 0 only capturing moves, pawn promotions 
   and responses to check are generated and searched, otherwise all 
   moves are processed. The search depth is modified for check evasions, 
   certain re-captures and threats. Extensions may continue for up to 11 
   ply beyond the nominal search depth. 
*/

#define prune (cf && score+node->score < alpha)
#define ReCapture (rcptr && score > alpha && score < beta &&\
                   ply > 2 && CptrFlag[ply-1] && CptrFlag[ply-2] &&\
                   depth == Sdepth-ply+1)
#define Parry (hung[side] > 1 && ply == Sdepth+1)
#define MateThreat (ply < Sdepth+4 && ply > 4 &&\
                    ChkFlag[ply-2] && ChkFlag[ply-4] &&\
                    ChkFlag[ply-2] != ChkFlag[ply-4])

{
register short j,pnt;
short best,tempb,tempc,tempsf,tempst;
short xside,pbst,d,e,cf,score,rcnt;
unsigned short mv,nxtline[maxdepth];
struct leaf *node,tmp;

  /* this is the only place we need to yield */
  rb->yield();
  /* and check for user interaction */
  callback();

  NodeCnt++;
  xside = otherside[side];
  
  if (ply <= Sdepth+3) repetition(rpt); else *rpt = 0;
  if (*rpt >= 2) return(0);

  score = evaluate(side,xside,ply,depth,alpha,beta);
  if (score > 9000) return(score);
  
  if (depth > 0)
    {
      if (InChk || PawnThreat[ply-1] || ReCapture) ++depth;
    }
  else
    {
      if (score >= alpha &&
         (InChk || PawnThreat[ply-1] || Parry)) depth = 1;
      else if (score <= beta && MateThreat) depth = 1;
    }
    
  PV = 0;
  if (depth > 0 && hashflag && ply > 1)
    {
      ProbeTTable(side,depth,&alpha,&beta,&score);
      bstline[ply] = PV;
      bstline[ply+1] = 0;
      if (beta == -20000) return(score);
      if (alpha > beta) return(alpha);
    }
  
  if (Sdepth == 1) d = 7; else d = 11;
  if (ply > Sdepth+d || (depth <= 0 && score > beta)) return(score);

  if (ply > 1) {
    if (depth > 0) {
	  MoveList(side,ply);
    } else {
	  CaptureList(side,xside,ply);
	}
  }
	
  if (TrPnt[ply] == TrPnt[ply+1]) return(score);
    
  cf = (depth < 1 && ply > Sdepth+1 && !ChkFlag[ply-2] && !slk);

  if (depth > 0) best = -12000; else best = score;
  if (best > alpha) alpha = best;
  
  for (pnt = pbst = TrPnt[ply];
       pnt < TrPnt[ply+1] && best <= beta;
       pnt++)
    {
      if (ply > 1) pick(pnt,TrPnt[ply+1]-1);
      node = &Tree[pnt];
      mv = (node->f << 8) + node->t;
      nxtline[ply+1] = 0;
      
      if (prune) break;
      if (ply == 1) UpdateSearchStatus;

      if (!(node->flags & exact))
        {
          MakeMove(side,node,&tempb,&tempc,&tempsf,&tempst);
          CptrFlag[ply] = (node->flags & capture);
          PawnThreat[ply] = (node->flags & pwnthrt);
          Tscore[ply] = node->score;
          node->score = -search(xside,ply+1,depth-1,-beta,-alpha,
                                nxtline,&rcnt,callback);
          if (abs(node->score) > 9000) node->flags |= exact;
          else if (rcnt == 1) node->score /= 2;
          if (rcnt >= 2 || GameCnt-Game50 > 99 ||
             (node->score == 9999-ply && !ChkFlag[ply]))
            {
              node->flags |= draw; node->flags |= exact;
              if (side == computer) node->score = contempt;
              else node->score = -contempt;
            }
          UnmakeMove(side,node,&tempb,&tempc,&tempsf,&tempst);
        }
      if (node->score > best && !timeout)
        {
          if (depth > 0)
            if (node->score > alpha && !(node->flags & exact))
              node->score += depth;
          best = node->score; pbst = pnt;
          if (best > alpha) alpha = best;
          for (j = ply+1; nxtline[j] > 0; j++) bstline[j] = nxtline[j];
          bstline[j] = 0;
          bstline[ply] = mv;
          if (ply == 1)
            {
              if (best == alpha)
                {
                  tmp = Tree[pnt];
                  for (j = pnt-1; j >= 0; j--) Tree[j+1] = Tree[j];
                  Tree[0] = tmp;
                  pbst = 0;
                }
              /*if (Sdepth > 2)
                if (best > beta) ShowResults(best,bstline,'+');
                else if (best < alpha) ShowResults(best,bstline,'-');
                else ShowResults(best,bstline,'&');*/
            }
        }
      if (NodeCnt > ETnodes) ElapsedTime(0);
      if (timeout) return(-Tscore[ply-1]);
    }
    
  node = &Tree[pbst];
  mv = (node->f<<8) + node->t;
  if (hashflag && ply <= Sdepth && *rpt == 0 && best == alpha)
    PutInTTable(side,best,depth,alpha,beta,mv);
  if (depth > 0)
    {
      j = (node->f<<6) + node->t; if (side == black) j |= 0x1000;
      if (history[j] < 150) history[j] += 2*depth;
      if (node->t != (GameList[GameCnt].gmove & 0xFF)) {
        if (best <= beta) {
		  killr3[ply] = mv;
        } else {
		  if (mv != killr1[ply]) {
            killr2[ply] = killr1[ply];
            killr1[ply] = mv;
          }
	    }
	  }
      if (best > 9000) killr0[ply] = mv; else killr0[ply] = 0;
    }
  return(best);
}


int evaluate(side,xside,ply,depth,alpha,beta)
short side,xside,ply,depth,alpha,beta;

/*
   Compute an estimate of the score by adding the positional score from 
   the previous ply to the material difference. If this score falls 
   inside a window which is 180 points wider than the alpha-beta window 
   (or within a 50 point window during quiescence search) call 
   ScorePosition() to determine a score, otherwise return the estimated 
   score. If one side has only a king and the other either has no pawns 
   or no pieces then the function ScoreLoneKing() is called. 
*/

{
register short evflag;

  Xscore = -Pscore[ply-1] - INCscore + mtl[side] - mtl[xside];
  hung[white] = hung[black] = 0;
  slk = ((mtl[white] == valueK && (pmtl[black] == 0 || emtl[black] == 0)) ||
         (mtl[black] == valueK && (pmtl[white] == 0 || emtl[white] == 0)));
  
  if (slk) evflag = false;
  else evflag = 
     (ply == 1 || ply < Sdepth ||
     (depth == 0 && Xscore > alpha-xwndw && Xscore < beta+xwndw) ||
     (depth < 0 && Xscore > alpha-25 && Xscore < beta+25));
    
  if (evflag)
    {
      EvalNodes++;
      ataks(side,atak[side]);
      if (atak[side][PieceList[xside][0]] > 0) return(10001-ply);
      ataks(xside,atak[xside]);
      InChk = (atak[xside][PieceList[side][0]] > 0);
      ScorePosition(side,&Xscore);
    }
  else
    {
      if (SqAtakd(PieceList[xside][0],side)) return(10001-ply);
      InChk = SqAtakd(PieceList[side][0],xside);
      if (slk) ScoreLoneKing(side,&Xscore);
    }
    
  Pscore[ply] = Xscore - mtl[side] + mtl[xside];
  if (InChk) ChkFlag[ply-1] = Pindex[TOsquare];
  else ChkFlag[ply-1] = 0;
  return(Xscore);
}


int ProbeTTable(side,depth,alpha,beta,score)
short side,depth,*alpha,*beta,*score;

/* 
   Look for the current board position in the transposition table.
*/

{
short hindx;
  if (side == white) hashkey |= 1; else hashkey &= 0xFFFE;
  hindx = (hashkey & (ttblsz-1));
  ptbl = (ttable + hindx);
  if (ptbl->depth >= depth && ptbl->hashbd == hashbd)
    {
      HashCnt++;
      PV = ptbl->mv;
      if (ptbl->flags & truescore)
        {
          *score = ptbl->score;
          *beta = -20000;
          return(true);
        }
/*
      else if (ptbl->flags & upperbound)
        {
          if (ptbl->score < *beta) *beta = ptbl->score+1;
        }
*/
      else if (ptbl->flags & lowerbound)
        {
          if (ptbl->score > *alpha) *alpha = ptbl->score-1;
        }
    }
  return(false);
}


void PutInTTable(side,score,depth,alpha,beta,mv)
short side,score,depth,alpha,beta;
unsigned short mv;

/*
   Store the current board position in the transposition table.
*/

{
short hindx;
  if (side == white) hashkey |= 1; else hashkey &= 0xFFFE;
  hindx = (hashkey & (ttblsz-1));
  ptbl = (ttable + hindx);
  ptbl->hashbd = hashbd;
  ptbl->depth = depth;
  ptbl->score = score; 
  ptbl->mv = mv;
  ptbl->flags = 0;
  if (score < alpha) ptbl->flags |= upperbound;
  else if (score > beta) ptbl->flags |= lowerbound;
  else ptbl->flags |= truescore;
}


void ZeroTTable()
{
int i;
  if (hashflag)
    for (i = 0; i < ttblsz; i++)
      {
        ptbl = (ttable + i);
        ptbl->depth = 0;
      }
}


void MoveList(side,ply)
short side,ply;

/*
   Fill the array Tree[] with all available moves for side to play. Array 
   TrPnt[ply] contains the index into Tree[] of the first move at a ply. 
*/
    
{
register short i,xside,f;

  xside = otherside[side];
  if (PV == 0) Swag0 = killr0[ply]; else Swag0 = PV;
  Swag1 = killr1[ply]; Swag2 = killr2[ply];
  Swag3 = killr3[ply]; Swag4 = 0;
  if (ply > 2) Swag4 = killr1[ply-2];
  TrPnt[ply+1] = TrPnt[ply];
  Dstart[pawn] = Dpwn[side]; Dstop[pawn] = Dstart[pawn] + 1;
  for (i = PieceCnt[side]; i >= 0; i--)
    GenMoves(ply,PieceList[side][i],side,xside);
  if (kingmoved[side] == 0 && !castld[side])
    {
      f = PieceList[side][0];
      if (castle(side,f,f+2,0))
        {
          LinkMove(ply,f,f+2,xside);
          Tree[TrPnt[ply+1]-1].flags |= cstlmask;
        }
      if (castle(side,f,f-2,0))
        {
          LinkMove(ply,f,f-2,xside);
          Tree[TrPnt[ply+1]-1].flags |= cstlmask;
        }
    }
}


void GenMoves(ply,sq,side,xside)
short ply,sq,side,xside;

/*
   Generate moves for a piece. The from square is mapped onto a special  
   board and offsets (taken from array Dir[]) are added to the mapped 
   location. The newly generated square is tested to see if it falls off 
   the board by ANDing the square with 88 HEX. Legal moves are linked 
   into the tree. 
*/
    
{
register short m,u,d,i,m0,piece; 

  piece = board[sq]; m0 = map[sq];
  if (sweep[piece])
    for (i = Dstart[piece]; i <= Dstop[piece]; i++)
      {
        d = Dir[i]; m = m0+d;
        while (!(m & 0x88))
          {
            u = unmap[m];
            if (color[u] == neutral)
              {
                LinkMove(ply,sq,u,xside);
                m += d;
              }
            else if (color[u] == xside)
              {
                LinkMove(ply,sq,u,xside);
                break;
              }
            else break;
          }
      }
  else if (piece == pawn)
    {
      if (side == white && color[sq+8] == neutral)
        {
          LinkMove(ply,sq,sq+8,xside);
          if (row[sq] == 1)
            if (color[sq+16] == neutral)
              LinkMove(ply,sq,sq+16,xside);
        }
      else if (side == black && color[sq-8] == neutral)
        {
          LinkMove(ply,sq,sq-8,xside);
          if (row[sq] == 6)
            if (color[sq-16] == neutral)
              LinkMove(ply,sq,sq-16,xside);
        }
      for (i = Dstart[piece]; i <= Dstop[piece]; i++)
        if (!((m = m0+Dir[i]) & 0x88))
          {
            u = unmap[m];
            if (color[u] == xside || u == epsquare)
              LinkMove(ply,sq,u,xside);
          }
    }
  else
    {
      for (i = Dstart[piece]; i <= Dstop[piece]; i++)
        if (!((m = m0+Dir[i]) & 0x88))
          {
            u = unmap[m];
            if (color[u] != side) LinkMove(ply,sq,u,xside);
          }
    }
}


void LinkMove(ply,f,t,xside)
short ply,f,t,xside;

/*
   Add a move to the tree.  Assign a bonus to order the moves
   as follows:
     1. Principle variation
     2. Capture of last moved piece
     3. Other captures (major pieces first)
     4. Killer moves
     5. "history" killers    
*/

{
register short s,z;
register unsigned short mv;
struct leaf *node;

  node = &Tree[TrPnt[ply+1]];
  ++TrPnt[ply+1];
  node->flags = 0;
  node->f = f; node->t = t;
  mv = (f<<8) + t;
  s = 0;
  if (mv == Swag0) s = 2000;
  else if (mv == Swag1) s = 60;
  else if (mv == Swag2) s = 50;
  else if (mv == Swag3) s = 40;
  else if (mv == Swag4) s = 30;
  if (color[t] != neutral)
    {
      node->flags |= capture;
      if (t == TOsquare) s += 500;
      s += value[board[t]] - board[f];
    }
  if (board[f] == pawn) {
    if (row[t] == 0 || row[t] == 7) {
        node->flags |= promote;
        s += 800;
    } else {
	  if (row[t] == 1 || row[t] == 6) {
        node->flags |= pwnthrt;
        s += 600;
      } else {
	    if (t == epsquare) node->flags |= epmask;
	  }
    }
  }
  z = (f<<6) + t; if (xside == white) z |= 0x1000;
  s += history[z];
  node->score = s - 20000;
}


void CaptureList(side,xside,ply)
short side,xside,ply;

/*
    Generate captures and Pawn promotions only.
*/

#define LinkCapture \
{\
  node->f = sq; node->t = u;\
  node->flags = capture;\
  node->score = value[board[u]] + svalue[board[u]] - piece;\
  if (piece == pawn && (u < 8 || u > 55))\
    {\
      node->flags |= promote;\
      node->score = valueQ;\
    }\
  ++node;\
  ++TrPnt[ply+1];\
}

{
register short m,u,d,sq,m0;
short i,j,j1,j2,r7,d0,piece,*PL;
struct leaf *node;

  TrPnt[ply+1] = TrPnt[ply];
  node = &Tree[TrPnt[ply]];
  Dstart[pawn] = Dpwn[side]; Dstop[pawn] = Dstart[pawn] + 1;
  if (side == white)
    {
      r7 = 6; d0 = 8;
    }
  else
    {
      r7 = 1; d0 = -8;
    }
  PL = PieceList[side];
  for (i = 0; i <= PieceCnt[side]; i++)
    { 
      sq = PL[i];
      m0 = map[sq]; piece = board[sq];
      j1 = Dstart[piece]; j2 = Dstop[piece];
      if (sweep[piece])
        for (j = j1; j <= j2; j++)
          {
            d = Dir[j]; m = m0+d;
            while (!(m & 0x88))
              {
                u = unmap[m];
                if (color[u] == neutral) m += d;
                else
                  {
                    if (color[u] == xside) LinkCapture;
                    break;
                  }
              }
          }
      else
        {
          for (j = j1; j <= j2; j++)
            if (!((m = m0+Dir[j]) & 0x88))
              {
                u = unmap[m];
                if (color[u] == xside) LinkCapture;
              }
          if (piece == pawn && row[sq] == r7)
            {
              u = sq+d0;
              if (color[u] == neutral) LinkCapture;
            }
        }
    }
}

  
int castle(side,kf,kt,iop)
short side,kf,kt,iop;

/*
   Make or Unmake a castling move.
*/

{
register short rf,rt,d,t0,xside;

  xside = otherside[side];
  if (kt > kf)
    {
      rf = kf+3; rt = kt-1; d = 1;
    }
  else
    {
      rf = kf-4; rt = kt+1; d = -1;
    }
  if (iop == 0)
    {
      if (board[kf] != king || board[rf] != rook || color[rf] != side)
        return(false);
      if (color[kt] != neutral || color[rt] != neutral) return(false);
      if (d == -1 && color[kt+d] != neutral) return(false);
      if (SqAtakd(kf,xside)) return(false);
      if (SqAtakd(kt,xside)) return(false);
      if (SqAtakd(kf+d,xside)) return(false);
    }
  else
    {
      if (iop == 1) castld[side] = true; else castld[side] = false;
      if (iop == 2)
        {
          t0 = kt; kt = kf; kf = t0;
          t0 = rt; rt = rf; rf = t0;
        }
      board[kt] = king; color[kt] = side; Pindex[kt] = 0;
      board[kf] = no_piece; color[kf] = neutral;
      board[rt] = rook; color[rt] = side; Pindex[rt] = Pindex[rf];
      board[rf] = no_piece; color[rf] = neutral;
      PieceList[side][Pindex[kt]] = kt;
      PieceList[side][Pindex[rt]] = rt;
      if (hashflag)
        {
          UpdateHashbd(side,king,kf,kt);
          UpdateHashbd(side,rook,rf,rt);
        }
    }
  return(true);
}


void EnPassant(xside,f,t,iop)
short xside,f,t,iop;

/*
   Make or unmake an en passant move.
*/

{
register short l;
  if (t > f) l = t-8; else l = t+8;
  if (iop == 1)
    {
      board[l] = no_piece; color[l] = neutral;
    }
  else 
    {
      board[l] = pawn; color[l] = xside;
    }
  InitializeStats();
}


void MakeMove(side,node,tempb,tempc,tempsf,tempst)
short side,*tempc,*tempb,*tempsf,*tempst;
struct leaf *node;

/*
   Update Arrays board[], color[], and Pindex[] to reflect the new board 
   position obtained after making the move pointed to by node. Also 
   update miscellaneous stuff that changes when a move is made. 
*/
    
{
register short f,t,xside,ct,cf;

  xside = otherside[side];
  f = node->f; t = node->t; epsquare = -1;
  FROMsquare = f; TOsquare = t;
  INCscore = 0;
  GameList[++GameCnt].gmove = (f<<8) + t;
  if (node->flags & cstlmask)
    {
      GameList[GameCnt].piece = no_piece;
      GameList[GameCnt].color = side;
      castle(side,f,t,1);
    }
  else
    {
      *tempc = color[t]; *tempb = board[t];
      *tempsf = svalue[f]; *tempst = svalue[t];
      GameList[GameCnt].piece = *tempb;
      GameList[GameCnt].color = *tempc;
      if (*tempc != neutral)
        {
          UpdatePieceList(*tempc,t,1);
          if (*tempb == pawn) --PawnCnt[*tempc][column[t]];
          if (board[f] == pawn)
            {
              --PawnCnt[side][column[f]];
              ++PawnCnt[side][column[t]];
              cf = column[f]; ct = column[t];
              if (PawnCnt[side][ct] > 1+PawnCnt[side][cf])
                INCscore -= 15;
              else if (PawnCnt[side][ct] < 1+PawnCnt[side][cf])
                INCscore += 15;
              else if (ct == 0 || ct == 7 || PawnCnt[side][ct+ct-cf] == 0)
                INCscore -= 15;
            }
          mtl[xside] -= value[*tempb];
          if (*tempb == pawn) pmtl[xside] -= valueP;
          if (hashflag) UpdateHashbd(xside,*tempb,-1,t);
          INCscore += *tempst;
        }
      color[t] = color[f]; board[t] = board[f]; svalue[t] = svalue[f];
      Pindex[t] = Pindex[f]; PieceList[side][Pindex[t]] = t;
      color[f] = neutral; board[f] = no_piece;
      if (board[t] == pawn) {
        if (t-f == 16) {
			epsquare = f+8;
        } else {
			if (f-t == 16) epsquare = f-8;
		}
	  }
      if (node->flags & promote)
        {
          board[t] = queen;
          --PawnCnt[side][column[t]];
          mtl[side] += valueQ - valueP;
          pmtl[side] -= valueP;
          HasQueen[side] = true;
          if (hashflag)
            {
              UpdateHashbd(side,pawn,f,-1);
              UpdateHashbd(side,queen,f,-1);
            }
          INCscore -= *tempsf;
        } 
      if (board[t] == king) ++kingmoved[side];
      if (node->flags & epmask) EnPassant(xside,f,t,1);
      else if (hashflag) UpdateHashbd(side,board[t],f,t);
    }
}


void UnmakeMove(side,node,tempb,tempc,tempsf,tempst)
short side,*tempc,*tempb,*tempsf,*tempst;
struct leaf *node;

/*
   Take back a move.
*/

{
register short f,t,xside;

  xside = otherside[side];
  f = node->f; t = node->t; epsquare = -1;
  GameCnt--;
  if (node->flags & cstlmask) castle(side,f,t,2);
  else
    {
      color[f] = color[t]; board[f] = board[t]; svalue[f] = *tempsf;
      Pindex[f] = Pindex[t]; PieceList[side][Pindex[f]] = f;
      color[t] = *tempc; board[t] = *tempb; svalue[t] = *tempst;
      if (node->flags & promote)
        {
          board[f] = pawn;
          ++PawnCnt[side][column[t]];
          mtl[side] += valueP - valueQ;
          pmtl[side] += valueP;
          if (hashflag)
            {
              UpdateHashbd(side,queen,-1,t);
              UpdateHashbd(side,pawn,-1,t);
            }
        } 
      if (*tempc != neutral)
        {
          UpdatePieceList(*tempc,t,2);
          if (*tempb == pawn) ++PawnCnt[*tempc][column[t]];
          if (board[f] == pawn)
            {
              --PawnCnt[side][column[t]];
              ++PawnCnt[side][column[f]];
            }
          mtl[xside] += value[*tempb];
          if (*tempb == pawn) pmtl[xside] += valueP;
          if (hashflag) UpdateHashbd(xside,*tempb,-1,t);
        }
      if (board[f] == king) --kingmoved[side];
      if (node->flags & epmask) EnPassant(xside,f,t,2);
      else if (hashflag) UpdateHashbd(side,board[f],f,t);
    }
}


void UpdateHashbd(side,piece,f,t)
short side,piece,f,t;

/*
   hashbd contains a 32 bit "signature" of the board position. hashkey 
   contains a 16 bit code used to address the hash table. When a move is 
   made, XOR'ing the hashcode of moved piece on the from and to squares 
   with the hashbd and hashkey values keeps things current. 
*/

{
  if (f >= 0)
    {
      hashbd ^= hashcode[side][piece][f].bd;
      hashkey ^= hashcode[side][piece][f].key;
    }
  if (t >= 0)
    {
      hashbd ^= hashcode[side][piece][t].bd;
      hashkey ^= hashcode[side][piece][t].key;
    }
}


void UpdatePieceList(side,sq,iop)
short side,sq,iop;

/*
   Update the PieceList and Pindex arrays when a piece is captured or 
   when a capture is unmade. 
*/

{
register short i;
  if (iop == 1)
    {
      PieceCnt[side]--;
      for (i = Pindex[sq]; i <= PieceCnt[side]; i++)
        {
          PieceList[side][i] = PieceList[side][i+1];
          Pindex[PieceList[side][i]] = i;
        }
    }
  else
    {
      PieceCnt[side]++;
      PieceList[side][PieceCnt[side]] = sq;
      Pindex[sq] = PieceCnt[side];
    }
}


void InitializeStats()

/*
   Scan thru the board seeing what's on each square. If a piece is found, 
   update the variables PieceCnt, PawnCnt, Pindex and PieceList. Also 
   determine the material for each side and set the hashkey and hashbd 
   variables to represent the current board position. Array 
   PieceList[side][indx] contains the location of all the pieces of 
   either side. Array Pindex[sq] contains the indx into PieceList for a 
   given square. 
*/

{
register short i,sq;
  epsquare = -1;
  for (i = 0; i < 8; i++)
    PawnCnt[white][i] = PawnCnt[black][i] = 0;
  mtl[white] = mtl[black] = pmtl[white] = pmtl[black] = 0;
  PieceCnt[white] = PieceCnt[black] = 0;
  hashbd = hashkey = 0;
  for (sq = 0; sq < 64; sq++)
    if (color[sq] != neutral)
      {
        mtl[color[sq]] += value[board[sq]];
        if (board[sq] == pawn)
          {
            pmtl[color[sq]] += valueP;
            ++PawnCnt[color[sq]][column[sq]];
          }
        if (board[sq] == king) Pindex[sq] = 0;
          else Pindex[sq] = ++PieceCnt[color[sq]];
        PieceList[color[sq]][Pindex[sq]] = sq;
        hashbd ^= hashcode[color[sq]][board[sq]][sq].bd;
        hashkey ^= hashcode[color[sq]][board[sq]][sq].key;
      }
}


void pick(p1,p2)
short p1,p2;

/*  
   Find the best move in the tree between indexes p1 and p2. Swap the 
   best move into the p1 element. 
*/

{
register short p,s,p0,s0;
struct leaf temp;

  s0 = Tree[p1].score; p0 = p1;
  for (p = p1+1; p <= p2; p++)
    if ((s = Tree[p].score) > s0)
      {
        s0 = s; p0 = p;
      }
  if (p0 != p1)
    {
      temp = Tree[p1]; Tree[p1] = Tree[p0]; Tree[p0] = temp;
    }
}


void repetition(cnt)
short *cnt;

/*
    Check for draw by threefold repetition.
*/

{
register short i,c,f,t;
short b[64];
unsigned short m;
  *cnt = c = 0;
  if (GameCnt > Game50+3)
    {
      for (i = 0; i < 64; b[i++] = 0);
      for (i = GameCnt; i > Game50; i--)
        {
          m = GameList[i].gmove; f = m>>8; t = m & 0xFF;
          if (++b[f] == 0) c--; else c++;
          if (--b[t] == 0) c--; else c++;
          if (c == 0) (*cnt)++;
        }
    }
}


int SqAtakd(sq,side)
short sq,side;

/*
  See if any piece with color 'side' ataks sq.  First check for pawns
  or king, then try other pieces. Array Dcode is used to check for
  knight attacks or R,B,Q co-linearity.  
*/

{
register short m,d,m0,m1,i,loc,piece,*PL;

  m1 = map[sq];
  if (side == white) m = m1-0x0F; else m = m1+0x0F;
  if (!(m & 0x88))
    if (board[unmap[m]] == pawn && color[unmap[m]] == side) return(true);
  if (side == white) m = m1-0x11; else m = m1+0x11;
  if (!(m & 0x88))
    if (board[unmap[m]] == pawn && color[unmap[m]] == side) return(true);
  if (distance(sq,PieceList[side][0]) == 1) return(true);
  
  PL = PieceList[side];
  for (i = 1; i <= PieceCnt[side]; i++)
    {
      loc = PL[i]; piece = board[loc];
      if (piece == pawn) continue;
      m0 = map[loc]; d = Dcode[abs(m1-m0)];
      if (d == 0 || (Pdir[d] & pbit[piece]) == 0) continue;
      if (piece == knight) return(true);
      else
        {
          if (m1 < m0) d = -d;
          for (m = m0+d; m != m1; m += d)
            if (color[unmap[m]] != neutral) break;
          if (m == m1) return(true);
        }
    }
  return(false);
}


void ataks(side,a)
short side,*a;

/*
    Fill array atak[][] with info about ataks to a square.  Bits 8-15
    are set if the piece (king..pawn) ataks the square. Bits 0-7
    contain a count of total ataks to the square.
*/

{
register short u,m,d,c,m0;
short j,j1,j2,piece,i,sq,*PL;
 
  for (u = 0; u < 64; a[u++] = 0); 
  Dstart[pawn] = Dpwn[side]; Dstop[pawn] = Dstart[pawn] + 1;
  PL = PieceList[side];
  for (i = 0; i <= PieceCnt[side]; i++)
    {
      sq = PL[i];
      m0 = map[sq];
      piece = board[sq];
      c = control[piece]; j1 = Dstart[piece]; j2 = Dstop[piece];
      if (sweep[piece])
        for (j = j1; j <= j2; j++)
          {
            d = Dir[j]; m = m0+d;
            while (!(m & 0x88))
              {
                u = unmap[m];
                a[u] = ++a[u] | c;
                if (color[u] == neutral) m += d;
                else break;
              }
          }
      else
        for (j = j1; j <= j2; j++)
          if (!((m = m0+Dir[j]) & 0x88))
            {
              u = unmap[m];
              a[u] = ++a[u] | c;
            }
    }
}



void ElapsedTime(iop)

/* 
   Determine the time that has passed since the search was started. If 
   the elapsed time exceeds the target (ResponseTime+ExtraTime) then set 
   timeout to true which will terminate the search. 
*/

short iop;
{
  /*et = time((long *)0) - time0;*/
  et = *(rb->current_tick) / HZ - time0;
  if (et < 0) et = 0;
  ETnodes += 50;
  if (et > et0 || iop == 1)
    {
      if (et > ResponseTime+ExtraTime && Sdepth > 1) timeout = true;
      et0 = et;
      if (iop == 1)
        {
          /*time0 = time((long *)0);*/
		  time0 = *(rb->current_tick) / HZ ;
		  et0 = 0;
        }
      /*(void) times(&tmbuf2);
      cputimer = 100*(tmbuf2.tms_utime - tmbuf1.tms_utime) / HZ;
      if (cputimer > 0) evrate = (100*NodeCnt)/(cputimer+100*ft);
      else evrate = 0;*/
      ETnodes = NodeCnt + 50;
      /*UpdateClocks();*/
    }
}



void SetTimeControl( void )
{
  if (TCflag)
    {
      TimeControl.moves[white] = TimeControl.moves[black] = TCmoves;
      TimeControl.clock[white] = TimeControl.clock[black] = 60*(long)TCminutes;
    }
  else
    {
      TimeControl.moves[white] = TimeControl.moves[black] = 0;
      TimeControl.clock[white] = TimeControl.clock[black] = 0;
      Level = 60*(long)TCminutes;
    }
  et = 0;
  ElapsedTime(1);
}



/* ............    INTERFACE ROUTINES    ........................... */

/*static void VoidFunction ( void ) {
  while (!(quit))
    {
      if (bothsides && !mate) SelectMove(opponent,1); else InputCommand();
      if (!(quit || mate || force)) SelectMove(computer,1);
    }
  ExitChess();
}*/

int VerifyMove(char s[],short iop,unsigned short *mv)

/*
   Compare the string 's' to the list of legal moves available for the 
   opponent. If a match is found, make the move on the board. 
*/

{
static short pnt,tempb,tempc,tempsf,tempst,cnt;
static struct leaf xnode;
struct leaf *node;

  *mv = 0;
  if (iop == 2)
    {
      UnmakeMove(opponent,&xnode,&tempb,&tempc,&tempsf,&tempst);
      return(false);
    }
  cnt = 0;
  MoveList(opponent,2);
  pnt = TrPnt[2];
  while (pnt < TrPnt[3])
    {
      node = &Tree[pnt++];
      algbr(node->f,node->t,node->flags & cstlmask);
      if (rb->strcmp(s,mvstr1) == 0 || rb->strcmp(s,mvstr2) == 0 ||
          rb->strcmp(s,mvstr3) == 0)
        {
          cnt++; xnode = *node;
        }
    }
  if (cnt == 1)
    {
      MakeMove(opponent,&xnode,&tempb,&tempc,&tempsf,&tempst);
      if (SqAtakd(PieceList[opponent][0],computer))
        {
          UnmakeMove(opponent,&xnode,&tempb,&tempc,&tempsf,&tempst);
          /*ShowMessage("Illegal Move!!");*/
          return(false);
        }
      else
        {
          if (iop == 1) return(true);
          /*if (xnode.flags & epmask) UpdateDisplay(0,0,1,0);
          else UpdateDisplay(xnode.f,xnode.t,0,xnode.flags & cstlmask);*/
          if (xnode.flags & cstlmask) Game50 = GameCnt;
          else if (board[xnode.t] == pawn || (xnode.flags & capture)) 
            Game50 = GameCnt;
          GameList[GameCnt].depth = GameList[GameCnt].score = 0;
          GameList[GameCnt].nodes = 0;
          ElapsedTime(1);
          GameList[GameCnt].time = (short)et;
          TimeControl.clock[opponent] -= et;
          --TimeControl.moves[opponent];
          *mv = (xnode.f << 8) + xnode.t;
          algbr(xnode.f,xnode.t,false);
          return(true);
        } 
    }
  /*if (cnt > 1) ShowMessage("Ambiguous Move!");*/
  return(false);
}


/* ---- Reset the board and other variables to start a new game. ---- */
void NewGame()  {
  short l,r,c,p;

  mate = quit = reverse = bothsides = post = false;
  hashflag = force = PawnStorm = false;
  easy = beep = rcptr = true;
  lpost =  NodeCnt = epsquare = et0 = 0;
  dither = 0;
  Awindow = 90;
  Bwindow = 90;
  xwndw = 90;
  MaxSearchDepth = 29;
  contempt = 0;
  GameCnt = -1; Game50 = 0;
  Zwmtl = Zbmtl = 0;
  Developed[white] = Developed[black] = false;
  castld[white] = castld[black] = false;
  kingmoved[white] = kingmoved[black] = 0;
  PawnThreat[0] = CptrFlag[0] = Threat[0] = false;
  Pscore[0] = 12000; Tscore[0] = 12000;
  opponent = white; computer = black;
  for (r = 0; r < 8; r++)
    for (c = 0; c < 8; c++)
      {
        l = 8*r+c; locn[r][c] = l;
        row[l] = r; column[l] = c;
        board[l] = Stboard[l]; color[l] = Stcolor[l];
      }
  for (c = white; c <= black; c++)
    for (p = pawn; p <= king; p++)
      for (l = 0; l < 64; l++)
        {
          hashcode[c][p][l].key = (unsigned short)rb->rand();
          hashcode[c][p][l].bd = ((unsigned long)rb->rand() << 16) +
                                 (unsigned long)rb->rand();
        }
  if (TCflag) SetTimeControl();
  /*else if (Level == 0) SelectLevel();*/
  /*UpdateDisplay(0,0,1,0);*/
  InitializeStats();
  /*time0 = time((long *)0);*/
  time0 = *(rb->current_tick) / HZ ;
  ElapsedTime(1);
  withbook = true;
}

/* ---- Initialize variables and reset board ---- */
void GNUChess_Initialize ( void ) {
  /*ttable = (struct hashentry *)malloc(ttblsz *
           (unsigned long)sizeof(struct hashentry));*/
  /* no malloc, statically allocated */
  Level = 1;
  OperatorTime = 0;
  TCmoves = 60;
  TCminutes = 5;
  TCflag = true;
  NewGame();
  MaxSearchDepth = 29 ; 
}

void algbr(f,t,flag)
short f,t,flag;
{
  mvstr1[0] = cxx[column[f]]; mvstr1[1] = rxx[row[f]];
  mvstr1[2] = cxx[column[t]]; mvstr1[3] = rxx[row[t]];
  mvstr2[0] = qxx[board[f]];
  mvstr2[1] = mvstr1[2]; mvstr2[2] = mvstr1[3];
  mvstr1[4] = '\0'; mvstr2[3] = '\0';
  if (flag) {
    if (t > f) {
	  rb->strcpy(mvstr2,"o-o");
    } else {
	  rb->strcpy(mvstr2,"o-o-o");
	}
  }
  
  if (board[f] == pawn) mvstr3[0] = mvstr1[0];
  else mvstr3[0] = qxx[board[f]];
  if (color[t] != neutral)
    {
      mvstr3[1] = ':';
      mvstr3[2] = mvstr1[2];
      mvstr3[3] = mvstr1[3];
      mvstr3[4] = '\0';
    }
  else if (board[f] == pawn)
    {
      mvstr3[1] = mvstr1[3];
      mvstr3[2] = '\0';
    }
  else
    {
      mvstr3[1] = mvstr1[0];
      mvstr3[2] = mvstr1[1];
      mvstr3[3] = mvstr1[2];
      mvstr3[4] = mvstr1[3];
      mvstr3[5] = '\0';
    }
}
generated by cgit v1.1 at 2026-05-19 09:16:17 +0000