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Myrddin.cpp
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Myrddin.cpp
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/*
Myrddin XBoard / WinBoard compatible chess engine written in C
Copyright(C) 2023 John Merlino
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 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
// Myrddin chess engine written by John Merlino, with lots of inspiration, assistance and patience (and perhaps some code) by:
// Ron Murawski -- Horizon (great amounts of assistance as I was starting out, plus hosting Myrddin's site)
// Martin Sedlak -- Cheng (guided me through tuning)
// Lars Hallerstrom - The Mad Tester!
// Dann Corbit (helped bring the first bitboard version of Myrddin to release)
// Bruce Moreland -- Gerbil (well-documented code on his website taught me the basics)
// Tom Kerrigan -- TSCP (a great starting point)
// Dr. Robert Hyatt -- Crafty (helped us all)
// Ed Schröder and Jeroen Noomen -- ProDeo Opening Book
// Andres Valverde -- EveAnn and part of the Dirty team
// Pradu Kannan - Magicmoves bitboard move generator for sliding pieces
// Vladimir Medvedev -- Greko (showed how strong a small, simple program could be)
// The Chessmaster Team -- Lots of brilliant people, but mostly Johan de Koning (The King engine), Don Laabs, James Stoddard and Dave Cobb
//
// DONE -- add to release notes
// fixed two bugs in SEE (stopped the calculation if the first capture was of equal value, and failed to include Kings in the calculation)
// fixed a bug that could cause a save to the hash table even if there was no best move
// tuned PST files for the first time, and re-tuned all other eval terms
// captures with negative SEE value can now be reduced
// IID is now more aggressive in its depth reduction and can be applied in PV nodes
// LMR reduction is now one depth less for PV nodes
// no longer limiting the number of extensions for a single branch
// reduced the number of aspiration windows before performing a full-width search from six to two
// fixed a rare bug such that if a tt probe or IID returned an underpromotion it would not be moved to the front of the movelist
// fixed an issue when receiving the "force" command while pondering, which can happen with some GUIs
// various minor optimizations
// added "see" command to return the SEE value of a capture on the current position - example usage "see d4 e5"
// added "rpt" command to run a brief perft test (perft uses bulk counting)
// removed "-64" from version string as there is no longer a 32-bit version
//
// TODO -- in no particular order
// get pondering move after search ends with a fail
#include <conio.h>
#include <signal.h>
#include <direct.h>
#include <sys/types.h>
#include <sys/timeb.h>
#include "myrddin.h"
#include "Bitboards.h"
#include "movegen.h"
#include "think.h"
#include "eval.h"
#include "fen.h"
#include "book.h"
#include "hash.h"
#include "tbprobe.h"
#include "gtb-probe.h"
#include "magicmoves.h"
char *szVersion = "Myrddin 0.90";
char *szInfo = "(6/9/23)";
CHESSMOVE cmGameMoveList[MAX_MOVE_LIST];
// initialization file settings
BOOL bLog=FALSE;
BOOL bKibitz=FALSE;
BOOL bEval=FALSE;
BOOL bSlave=FALSE;
int nCPUs = 1;
int nEGTBCompressionType=tb_CP4;
char szEGTBPath[MAX_PATH];
BOOL bNoTB = FALSE;
int nResignVal = 0, nResignMoves = 0;
// other (evil) globals
unsigned int nGameMove;
int nDepth, nThinkDepth, nPrevPVEval;
int nCompSide;
unsigned int nThinkTime, nPonderTime, nFischerInc, nLevelMoves, nMovesBeforeControl;
int nClockRemaining; // needs to be signed because it can be temporarily negative when calculating time to think
unsigned int nCheckNodes;
CHESSMOVE cmBestMove, cmPonderMove;
BB_BOARD bbPonderRestore;
clock_t nThinkStart;
BOOL bPost, bStoreCommand, bInBook, bPondering, bXboard, bComputer, bExactThinkTime, bExactThinkDepth, bTuning;
int nEngineMode, nEngineCommand;
PosSignature dwInitialPosSignature;
FILE *logfile;
char line[512], command[512];
int is_pipe = 0;
HANDLE input_handle = 0;
int nSlaveNum = -1;
#if USE_SMP
char szProgName[MAX_PATH];
char szSharedMemName[32], szSharedHashName[32];
HANDLE hSharedMem = NULL;
HANDLE hSharedHash = NULL;
SHARED_HASH *shSharedHash;
SHARED_MEM *smSharedMem;
STARTUPINFO si;
PROCESS_INFORMATION pi[MAX_CPUS];
#endif
PieceType BackRank[BSIZE] = {ROOK, KNIGHT, BISHOP, QUEEN, KING, BISHOP, KNIGHT, ROOK};
// tuning data
#if USE_GRANT_SET
double K = 1.1871;
char TuningFile[32] = "granttuning.epd";
#elif USE_LICHESS_SET
double K = 1.3118;
char TuningFile[32] = "lichess-big3-resolved.epd";
#else
double K = 1.3931;
char TuningFile[32] = "quiet-labeled.epd";
#endif
#if USE_SMP
/*========================================================================
** SendSlavesString -- Sends (forwards) a command string to all slave
** processes
**========================================================================
*/
void SendSlavesString(char *szString)
{
int x;
char *c;
if (nCPUs <= 1)
return;
if (!smSharedMem)
return;
// strip trailing carriage return if there is one
c = strrchr(szString, '\n');
if (c)
*c = '\0';
#if DEBUG_SMP
fprintf(logfile, "Sending slaves -- %s\n", szString);
#endif
for (x = 0; x < nCPUs - 1; x++)
{
if (smSharedMem->sdSlaveData[x].bLocked || (strlen(smSharedMem->sdSlaveData[x].szEngineCommand[smSharedMem->sdSlaveData[x].nNextToSend])))
Sleep(10);
smSharedMem->sdSlaveData[x].bLocked = TRUE;
strcpy(smSharedMem->sdSlaveData[x].szEngineCommand[smSharedMem->sdSlaveData[x].nNextToSend], szString);
smSharedMem->sdSlaveData[x].nNextToSend = (smSharedMem->sdSlaveData[x].nNextToSend + 1) % NUM_SLAVE_STRINGS;
smSharedMem->sdSlaveData[x].bLocked = FALSE;
}
}
/*========================================================================
** ZeroSlaveNodes -- Clears the number of nodes searched by each process
**========================================================================
*/
void ZeroSlaveNodes(void)
{
int x;
if (nCPUs <= 1)
return;
if (!smSharedMem)
return;
for (x = 0; x < nCPUs - 1; x++)
smSharedMem->sdSlaveData[x].nSearchNodes = 0;
}
#endif
/*========================================================================
** LogPST - prints the PST tables to the logfile
**========================================================================
*/
void LogPST(void)
{
int x, y;
for (x = 0; x < 14; x++)
{
fprintf(logfile, "{");
for (y = 0; y < 64; y++)
{
if (y % 8 == 0)
fprintf(logfile, "\n\t");
fprintf(logfile, "%3d, ", PST[x][y]);
}
fprintf(logfile, "\n},\n");
}
}
/*========================================================================
** ParseIniFile -- Handle commands from the initialization file
**========================================================================
*/
void ParseIniFile(void)
{
FILE *IniFile;
char command[256];
IniFile = fopen("Myrddin.ini", "rt");
if (!IniFile)
{
printf("Myrddin.ini initialization file not found!\n");
return;
}
while (fgets(command, 256, IniFile))
{
if (*command == 0)
break;
if (strnicmp(command, "logfile=", 8) == 0)
{
// "logfile" -- valid values: 1 = create logfile, 0 = do not create logfile
bLog = (command[8] == '1');
}
else if (strnicmp(command, "kibitz=", 7) == 0)
{
// "kibitz" -- valid values: 1 = kibitz PV output, 0 = do not kibitz PV output
bKibitz = (command[7] == '1');
}
else if (strnicmp(command, "resign=", 7) == 0)
{
// "resign" -- valid values: 1 = allow resigning, 0 = do not allow resigning
nResignVal = atoi(&command[7]);
}
#if USE_HASH
else if (strnicmp(command, "hashsize=", 9) == 0)
{
size_t v;
BOOL bPowerOf2;
// "hashsize" -- valid values: any number between 0 and 2048, specifying requested size in MB
// preferably a power of 2, will round DOWN if not
v = atoi(&command[9]);
bPowerOf2 = !(v & (v - 1)) && v; // thanks to http://graphics.stanford.edu/~seander/bithacks.html
if (!bPowerOf2)
{
v >>= 1; // round DOWN!
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
}
dwHashSize = (v << 20); // multiply by 1MB
dwHashSize >>= 4; // divide by size of hash entry (rounding up to power of 2)
}
#endif
#if USE_EGTB
else if (strnicmp(command, "egtbcompressiontype=", 20) == 0)
{
// "egtbcompressiontype" -- valid values: 0 = uncompressed, 1-4 = compression types 1-4 (4 is default and recommended)
nEGTBCompressionType = atoi(&command[20]);
}
else if (strnicmp(command, "egtbfolder=", 10) == 0)
{
char *c;
// "egtbfolder" -- valid values: valid folder location for EGTB files
strcpy(szEGTBPath, command+11);
// strip off trailing carriage return
c = strrchr(szEGTBPath, '\n');
if (c)
*c = '\0';
// strip off spaces
c = strchr(szEGTBPath, ' ');
if (c)
*c = '\0';
}
#endif
#if USE_SMP
else if (strnicmp(command, "cpus=", 5) == 0)
{
// "cpus" -- number of cpus to use
nCPUs = atoi(&command[5]);
nCPUs = max(nCPUs, 1);
nCPUs = min(nCPUs, MAX_CPUS);
#if DEBUG_SMP
printf("Number of CPUS = %d\n", nCPUs);
#endif
}
#endif
}
fclose(IniFile);
}
#if USE_SMP
/*========================================================================
** ParseCommandline -- Handle commands from the command line
**========================================================================
*/
void ParseCommandline(int argc, char *argv[])
{
int n = 1;
char command[64]={0};
while (n < argc)
{
strcpy(command, argv[n]);
#if DEBUG_SMP
printf("command %d is %s\n", n, command);
#endif
if (strncmp(command, "sharedmem=", 10) == 0)
{
// "sharedmem" -- string containing name of shared memory for slave process game management
if (bSlave) // only do this if "slave" has been sent on the commandline first
strcpy(szSharedMemName, command+10);
}
else if (strncmp(command, "sharedhash=", 11) == 0)
{
// "sharedhash" -- string containing name of shared memory for slave process transposition/eval/pawn hash
if (bSlave) // only do this if "slave" has been sent on the commandline first
strcpy(szSharedHashName, command+11);
}
else if (strncmp(command, "slave", 5) == 0)
{
// "slave" -- this is a slave process for SMP
bSlave = TRUE;
}
else if (strncmp(command, "numslave=", 9) == 0)
{
// "numslave" -- this is the slave process number
if (bSlave) // only do this if "slave" has been sent on the commandline first
nSlaveNum = atoi(&command[9]);
}
n++;
}
}
#endif
/*========================================================================
** InitializeInput -- Open the stdin pipe for reading
**========================================================================
*/
void InitializeInput(void)
{
DWORD dw;
input_handle = GetStdHandle(STD_INPUT_HANDLE);
is_pipe = !GetConsoleMode(input_handle, &dw);
if (!is_pipe)
{
SetConsoleMode(input_handle, dw & ~(ENABLE_MOUSE_INPUT | ENABLE_WINDOW_INPUT));
FlushConsoleInputBuffer(input_handle);
}
setvbuf(stdin, (char*)NULL, _IONBF, 0);
setvbuf(stdout, (char*)NULL, _IONBF, 0);
signal(SIGINT, SIG_IGN);
}
/*========================================================================
** IsInputAvailable -- Check the stdin pipe for input
**========================================================================
*/
int IsInputAvailable(void)
{
DWORD nchars;
if (is_pipe)
{
if (!PeekNamedPipe(input_handle, NULL, 0, NULL, &nchars, NULL))
exit(-1);
return (nchars);
}
else
return(_kbhit());
}
/*========================================================================
** PromptForInput - Notify console window that input can now be given by
** the user
**========================================================================
*/
void PromptForInput(void)
{
if (bSlave || bXboard)
return;
printf("> ");
fflush(stdout);
}
/*========================================================================
** CheckForInput - Check for user input
**========================================================================
*/
BOOL CheckForInput(BOOL bWaitForInput)
{
#if USE_SMP
if (bSlave)
{
if (bWaitForInput)
{
while (strlen(smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive]) == 0 || smSharedMem->sdSlaveData[nSlaveNum].bLocked)
Sleep(10);
}
if (strlen(smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive]) && !smSharedMem->sdSlaveData[nSlaveNum].bLocked)
{
smSharedMem->sdSlaveData[nSlaveNum].bLocked = TRUE;
#if DEBUG_SMP
printf("slave %d has some input in slot %d -- '%s'\n", nSlaveNum, smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive,
smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive]);
fprintf(logfile, "slave %d has some input in slot %d -- '%s'\n", nSlaveNum, smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive,
smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive]);
#endif
strcpy(line, smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive]);
char *c = strchr(smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive], ' ');
if (c)
*c = '\0';
strcpy(command, smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive]);
smSharedMem->sdSlaveData[nSlaveNum].szEngineCommand[smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive][0] = '\0';
smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive = (smSharedMem->sdSlaveData[nSlaveNum].nNextToReceive + 1) % NUM_SLAVE_STRINGS;
smSharedMem->sdSlaveData[nSlaveNum].bLocked = FALSE;
#if DEBUG_SMP
printf("command = %s\n", command);
printf("line = %s\n", line);
#endif
return(TRUE);
}
else
return(FALSE);
}
#endif
if (bWaitForInput == FALSE)
{
if (!IsInputAvailable())
return(FALSE);
}
if (!fgets(line, 256, stdin))
return(-1); // shouldn't ever happen
if (line[0] == '\n')
return(FALSE);
if (bLog)
fprintf(logfile, "> Received %s", line);
sscanf(line, "%s", command);
return(TRUE);
}
/*========================================================================
** MoveToString -- converts a CHESSMOVE to a coordinate notation string
**========================================================================
*/
char *MoveToString(char *moveString, CHESSMOVE *move, BOOL bAddMove)
{
sprintf(moveString, "%s%c%c%c%c", (bAddMove ? "move " : ""),
BBSQ2COLNAME(move->fsquare), BBSQ2ROWNAME(move->fsquare),
BBSQ2COLNAME(move->tsquare), BBSQ2ROWNAME(move->tsquare));
if (move->moveflag & MOVE_PROMOTED)
{
int promotedPiece = move->moveflag & MOVE_PIECEMASK;
switch (promotedPiece)
{
case QUEEN:
strcat(moveString, "Q");
break;
case ROOK:
strcat(moveString, "R");
break;
case BISHOP:
strcat(moveString, "B");
break;
case KNIGHT:
strcat(moveString, "N");
break;
}
}
return(moveString);
}
char* PVMoveToString(char* moveString, PVMOVE* move, BOOL bAddMove)
{
sprintf(moveString, "%s%c%c%c%c", (bAddMove ? "move " : ""),
BBSQ2COLNAME(move->fsquare), BBSQ2ROWNAME(move->fsquare),
BBSQ2COLNAME(move->tsquare), BBSQ2ROWNAME(move->tsquare));
if (move->moveflag & MOVE_PROMOTED)
{
int promotedPiece = move->moveflag & MOVE_PIECEMASK;
switch (promotedPiece)
{
case QUEEN:
strcat(moveString, "Q");
break;
case ROOK:
strcat(moveString, "R");
break;
case BISHOP:
strcat(moveString, "B");
break;
case KNIGHT:
strcat(moveString, "N");
break;
}
}
return(moveString);
}
/*========================================================================
** bbNewGame -- Resets the game board to a new game in the initial position
**========================================================================
*/
void bbNewGame(BB_BOARD *bbBoard)
{
int x;
#if USE_HASH
// nHashAge = 0;
ClearHash();
#endif
#if USE_HISTORY
ClearHistory();
#endif
#if USE_KILLERS
ClearKillers(FALSE);
#endif
ZeroMemory(bbBoard, sizeof(BB_BOARD));
bbBoard->bbPieces[KING][WHITE] = Bit[BB_E1];
bbBoard->bbPieces[KING][BLACK] = Bit[BB_E8];
bbBoard->bbPieces[QUEEN][WHITE] = Bit[BB_D1];
bbBoard->bbPieces[QUEEN][BLACK] = Bit[BB_D8];
bbBoard->bbPieces[ROOK][WHITE] = Bit[BB_A1] | Bit[BB_H1];
bbBoard->bbPieces[ROOK][BLACK] = Bit[BB_A8] | Bit[BB_H8];
bbBoard->bbPieces[BISHOP][WHITE] = Bit[BB_C1] | Bit[BB_F1];
bbBoard->bbPieces[BISHOP][BLACK] = Bit[BB_C8] | Bit[BB_F8];
bbBoard->bbPieces[KNIGHT][WHITE] = Bit[BB_B1] | Bit[BB_G1];
bbBoard->bbPieces[KNIGHT][BLACK] = Bit[BB_B8] | Bit[BB_G8];
bbBoard->bbPieces[PAWN][WHITE] = BB_RANK_2;
bbBoard->bbPieces[PAWN][BLACK] = BB_RANK_7;
bbBoard->bbMaterial[WHITE] = BB_RANK_1 | BB_RANK_2;
bbBoard->bbMaterial[BLACK] = BB_RANK_7 | BB_RANK_8;
bbBoard->bbOccupancy = BB_RANK_1 | BB_RANK_2 | BB_RANK_7 | BB_RANK_8;
ZeroMemory(&bbBoard->squares, sizeof(bbBoard->squares));
for (x = 0; x < 8; x++)
{
bbBoard->squares[x] = XBLACK|BackRank[x];
bbBoard->squares[x + 8] = BLACK_PAWN;
bbBoard->squares[x + 48] = WHITE_PAWN;
bbBoard->squares[x + 56] = XWHITE|BackRank[x];
}
#if 0
bbBoard->kingsquares[WHITE] = BB_E1;
bbBoard->kingsquares[BLACK] = BB_E8;
#endif
bbBoard->sidetomove = WHITE;
bbBoard->castles = WHITE_KINGSIDE_BIT | WHITE_QUEENSIDE_BIT | BLACK_KINGSIDE_BIT | BLACK_QUEENSIDE_BIT;
bbBoard->epSquare = NO_SQUARE;
bbBoard->fifty = 0;
bbBoard->inCheck = FALSE;
bbBoard->signature = GetBBSignature(bbBoard);
bbBoard->phase = TOTAL_PHASE;
#if USE_PAWN_HASH
bbBoard->pawnsignature = GetBBPawnSignature(bbBoard);
#endif
ZeroMemory(cmGameMoveList, sizeof(cmGameMoveList));
nGameMove = 0;
bInBook = TRUE;
bComputer = FALSE;
if (bKibitz)
printf("tellics kibitz Hello, this is Myrddin, a fledgling chess engine that plays around 2600 ELO. Thanks for playing!\n");
}
/*========================================================================
** GamePositionRepeated - Checks to see if the position on the game board
** has ever occurred in the game
**========================================================================
*/
BOOL GamePositionRepeated(PosSignature dwSignature)
{
int n, nReps;
nReps = 0;
for (n = nGameMove-2; n >= 0; n--)
{
if (cmGameMoveList[n].dwSignature == dwSignature)
{
nReps++;
if (nReps >= 2)
return(TRUE);
}
if (cmGameMoveList[n].dwSignature == 0) // bail if we find a null move, is this correct?
return(FALSE);
}
return(FALSE);
}
/*========================================================================
** BoardIsMaterialDraw - Checks to see if the material on the game board
** is insufficient for either side to checkmate
**========================================================================
*/
BOOL BoardIsMaterialDraw(BB_BOARD *board)
{
if (board->bbPieces[QUEEN][WHITE] || board->bbPieces[QUEEN][BLACK]
|| board->bbPieces[ROOK][WHITE] || board->bbPieces[ROOK][BLACK]
|| board->bbPieces[PAWN][WHITE] || board->bbPieces[PAWN][BLACK])
return(FALSE);
if (BitCount(board->bbPieces[BISHOP][WHITE] | board->bbPieces[BISHOP][BLACK]
| board->bbPieces[KNIGHT][WHITE] | board->bbPieces[KNIGHT][BLACK]) == 1)
return(TRUE); // either kings only or just one minor left
return(FALSE);
}
/*========================================================================
** NotHandled - generic error message when a command can't be handled
** because the engine is thinking
**========================================================================
*/
void NotHandled(void)
{
if (bLog)
fprintf(logfile, "%s command not handled while engine is %s\n", command,
(nEngineMode == ENGINE_ANALYZING ? "analyzing" : "thinking"));
printf("%s command not handled while engine is %s\n", command,
(nEngineMode == ENGINE_ANALYZING ? "analyzing" : "thinking"));
}
/*========================================================================
** HandleCommand - parse and handle input commands
**========================================================================
*/
void HandleCommand(void)
{
if (strlen(command) == 0)
return;
if (bLog)
fprintf(logfile, "Handling Command %s\n", command);
if (!strcmp(command, "protover"))
{
int version;
sscanf(line, "%s %d", command, &version);
if (version == 2)
{
printf("feature done=0\n");
printf("feature setboard=1 playother=1 draw=0\n");
printf("feature sigint=0 sigterm=0 reuse=0 analyze=1\n");
printf("feature variants=normal\n");
printf("feature myname=\"%s\"\n", szVersion);
printf("feature done=1\n");
fflush(stdout);
}
if (bLog)
fprintf(logfile, "< Finished protover\n");
PromptForInput();
return;
}
if (!strcmp(command, "xboard"))
{
bXboard = TRUE;
return;
}
if (!strcmp(command, "new"))
{
#if USE_SMP
if (!bSlave)
SendSlavesString(command);
#endif
if ((bStoreCommand == FALSE) &&
((nEngineMode == ENGINE_THINKING) || (nEngineMode == ENGINE_ANALYZING) || (nEngineMode == ENGINE_PONDERING)))
{
nEngineCommand = STOP_THINKING;
bStoreCommand = TRUE;
return;
}
bbNewGame(&bbBoard);
nFischerInc = 0; // reset the fischer increment
nCompSide = BLACK;
if (nEngineMode != ENGINE_ANALYZING)
PromptForInput();
if (bLog)
fprintf(logfile, "< Finished new\n");
bStoreCommand = FALSE;
return;
}
if (!strcmp(command, "setboard") || !strcmp(command, "loadfen"))
{
char *c;
#if USE_SMP
if (!bSlave)
SendSlavesString(line);
#endif
if ((bStoreCommand == FALSE) &&
((nEngineMode == ENGINE_THINKING) || (nEngineMode == ENGINE_ANALYZING) || (nEngineMode == ENGINE_PONDERING)))
{
nEngineCommand = STOP_THINKING;
bStoreCommand = TRUE;
return;
}
if (strlen(line) <= 10)
{
printf("Invalid command: %s\n", command);
PromptForInput();
return;
}
// strip trailing carriage return if there is one
c = strrchr(line, '\n');
if (c)
*c = '\0';
bbNewGame(&bbBoard);
if (BBForsytheToBoard(line + 9, &bbBoard) == -1)
{
printf("Error parsing FEN %s\nstarting new game\n", line + 9);
bbNewGame(&bbBoard);
PromptForInput();
return;
}
bbBoard.inCheck = BBKingInDanger(&bbBoard, bbBoard.sidetomove);
dwInitialPosSignature = bbBoard.signature = GetBBSignature(&bbBoard);
#if USE_PAWN_HASH
bbBoard.pawnsignature = GetBBPawnSignature(&bbBoard);
#endif
#if 0
WORD x = 0;
char buf[128];
CHESSMOVE cmEvalMoveList[MAX_LEGAL_MOVES];
BBGenerateAllMoves(&bbBoard, &cmEvalMoveList[0], &x, FALSE);
printf("%d moves from position %s\n", x, BBBoardToForsythe(&bbBoard, 0, buf));
#endif
nCompSide = NO_SIDE;
if (nEngineMode != ENGINE_ANALYZING)
PromptForInput();
if (bLog)
fprintf(logfile, "< Finished setboard\n");
bStoreCommand = FALSE;
return;
}
#if USE_SMP
if (!strncmp(command, "cores", 5))
{
if (bSlave)
return;
if (nEngineMode == ENGINE_THINKING || nEngineMode == ENGINE_ANALYZING || nEngineMode == ENGINE_PONDERING)
{
NotHandled();
PromptForInput();
return;
}
KillProcesses();
if (command[5] == '=')
nCPUs = atoi(&command[6]);
else
sscanf(line, "%s %d", command, &nCPUs);
if (nCPUs < 1)
nCPUs = 1;
if (nCPUs > MAX_CPUS)
nCPUs = MAX_CPUS;
StartProcesses(nCPUs);
if (bLog)
fprintf(logfile, "Now using %d processes\n", nCPUs);
printf("Now using %d processes\n\n", nCPUs);
PromptForInput();
return;
}
#endif
if (!strcmp(command, "perft"))
{
#if USE_SMP
if (bSlave)
return;
#endif
int depth;
clock_t starttime;
if (nEngineMode == ENGINE_THINKING || nEngineMode == ENGINE_ANALYZING || nEngineMode == ENGINE_PONDERING)
{
NotHandled();
PromptForInput();
return;
}
sscanf(line, "%s %d", command, &depth);
starttime = GetTickCount();
nPerftMoves = doBBPerft(depth, &bbBoard, FALSE);
#if USE_BULK_COUNTING
printf("Using bulk counting... ");
#endif
printf("perft %d = %I64u in %.2f seconds\n", depth, nPerftMoves, (float)((GetTickCount() - starttime)) / 1000);
#if !USE_BULK_COUNTING
printf("%ld KNPS\n", nPerftMoves / (GetTickCount() - starttime));
#endif
PromptForInput();
return;
}
if (!strcmp(command, "divide"))
{
#if USE_SMP
if (bSlave)
return;
#endif
int depth;
clock_t starttime;
if (nEngineMode == ENGINE_THINKING || nEngineMode == ENGINE_ANALYZING || nEngineMode == ENGINE_PONDERING)
{
NotHandled();
PromptForInput();
return;
}
sscanf(line, "%s %d", command, &depth);
#if USE_BULK_COUNTING
printf("Using bulk counting...\n");
#endif
starttime = GetTickCount();
nPerftMoves = doBBPerft(depth, &bbBoard, TRUE);
printf("perft %d = %I64u in time %.2f\n", depth, nPerftMoves, (float)((GetTickCount() - starttime)) / 1000);
PromptForInput();
return;
}
if (!strcmp(command, "rpt")) // run perft test
{
#if USE_SMP
if (bSlave)
return;
#endif
int x;
clock_t alltime, starttime;
#if USE_BULK_COUNTING
printf("Using bulk counting...\n");
#endif
alltime = GetTickCount();
for (x = 0; x < NUM_PERFT_TESTS; x++)
{
bbNewGame(&bbBoard);
BBForsytheToBoard(perft_tests[x].fen, &bbBoard);
bbBoard.inCheck = BBKingInDanger(&bbBoard, bbBoard.sidetomove);
dwInitialPosSignature = bbBoard.signature = GetBBSignature(&bbBoard);
#if USE_PAWN_HASH
bbBoard.pawnsignature = GetBBPawnSignature(&bbBoard);
#endif
printf("%d) %s - ", x+1, perft_tests[x].fen);
starttime = GetTickCount();
nPerftMoves = doBBPerft(perft_tests[x].depth, &bbBoard, FALSE);
printf("perft %d = %I64u in %.2f seconds - ", perft_tests[x].depth, nPerftMoves, (float)((GetTickCount() - starttime)) / 1000);
if (nPerftMoves != perft_tests[x].value)
printf("FAILED! Should be %I64u\n", perft_tests[x].value);
else
printf("passed\n");
}
printf("Total Time = %.2f seconds\n", (float)((GetTickCount() - alltime)) / 1000);
PromptForInput();
return;
}
if (!strcmp(command, "eval"))
{
#if USE_SMP
if (bSlave)
return;
#endif
if (nEngineMode != ENGINE_IDLE)
{
NotHandled();
PromptForInput();
return;
}
int nResult;
bEval = TRUE;
#if USE_EGTB
if (BitCount(bbBoard.bbOccupancy) <= 5)
nResult = GaviotaTBProbe(&bbBoard, FALSE);
else
#endif
nResult = BBEvaluate(&bbBoard, -INFINITY, INFINITY);
printf("score = %d\n", nResult);
if (bbBoard.sidetomove == BLACK)
nResult *= -1;
printf("static evaluation of %s = %d, sig = %016I64X\n", BBBoardToForsythe(&bbBoard, 0, line),
nResult, GetBBSignature(&bbBoard));
PromptForInput();
if (bLog)
fprintf(logfile, "< Finished eval\n");
bEval = FALSE;
return;