/
CBoard.cc
1524 lines (1353 loc) · 47.5 KB
/
CBoard.cc
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#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "CBoard.h"
#ifdef DEBUG_HASH
#include "crc32.h"
#endif
// Create nice colours in the console output
#define TTY_YELLOW "[33m"
#define TTY_BLUE "[34m"
#define TTY_NORM "[0m"
static char pieces[] = "kqrbnp.PNBRQK";
/***************************************************************
* operator <<
* This displays the current board configuration on the stream.
***************************************************************/
std::ostream& operator <<(std::ostream &os, const CBoard &rhs)
{
for (int row=8; row>=1; --row)
{
os << TTY_NORM << row << " ";
for (int col=1; col<=8; ++col)
{
int number = (row+1)*10+col;
int piece = rhs.m_board[number];
if (piece != IV)
{
if (piece < 0)
os << TTY_BLUE;
else if (piece > 0)
os << TTY_YELLOW;
else
os << TTY_NORM;
os << pieces[piece+6] << " ";
}
}
os << std::endl;
}
os << TTY_NORM;
os << " a b c d e f g h" << std::endl;
switch (rhs.m_side_to_move)
{
case 1 : os << "White to move" << std::endl; break;
default : os << "Black to move" << std::endl; break;
}
if (rhs.m_castleRights & CASTLE_WHITE_SHORT)
os << "K";
if (rhs.m_castleRights & CASTLE_WHITE_LONG)
os << "Q";
if (rhs.m_castleRights & CASTLE_BLACK_SHORT)
os << "k";
if (rhs.m_castleRights & CASTLE_BLACK_LONG)
os << "q";
if (!rhs.m_castleRights)
os << "-";
os << " ";
if (rhs.m_enPassantSquare)
os << CSquare(rhs.m_enPassantSquare);
else
os << "-";
os << std::endl;
os << "Material : " << rhs.m_material << std::endl;
if (rhs.isKingInCheck())
{
os << "You are in check!" << std::endl;
}
return os;
} // end of std::ostream& operator <<(std::ostream &os, const CBoard &rhs)
/**************************************************************
* newGame
* This resets the board configuration to the initial game setup
***************************************************************/
void CBoard::newGame()
{
e_piece initial[120] = {
IV, IV, IV, IV, IV, IV, IV, IV, IV, IV,
IV, IV, IV, IV, IV, IV, IV, IV, IV, IV,
IV, WR, WN, WB, WQ, WK, WB, WN, WR, IV,
IV, WP, WP, WP, WP, WP, WP, WP, WP, IV,
IV, EM, EM, EM, EM, EM, EM, EM, EM, IV,
IV, EM, EM, EM, EM, EM, EM, EM, EM, IV,
IV, EM, EM, EM, EM, EM, EM, EM, EM, IV,
IV, EM, EM, EM, EM, EM, EM, EM, EM, IV,
IV, BP, BP, BP, BP, BP, BP, BP, BP, IV,
IV, BR, BN, BB, BQ, BK, BB, BN, BR, IV,
IV, IV, IV, IV, IV, IV, IV, IV, IV, IV,
IV, IV, IV, IV, IV, IV, IV, IV, IV, IV} ;
m_board.reserve(120);
for (int i=0; i<120; ++i)
{
m_board[i] = initial[i];
}
m_side_to_move = 1;
m_castleRights =
CASTLE_WHITE_SHORT |
CASTLE_WHITE_LONG |
CASTLE_BLACK_SHORT |
CASTLE_BLACK_LONG;
m_enPassantSquare = 0;
m_material = 0;
m_halfMoves = 0;
m_fullMoves = 0;
m_state.clear();
} // end of newGame
/**************************************************************
* calcMaterial
***************************************************************/
void CBoard::calcMaterial()
{
m_material = 0;
for (int i=0; i<120; ++i)
{
switch (m_board[i])
{
case WP : m_material += 1; break;
case WN : m_material += 3; break;
case WB : m_material += 3; break;
case WR : m_material += 5; break;
case WQ : m_material += 9; break;
case BP : m_material -= 1; break;
case BN : m_material -= 3; break;
case BB : m_material -= 3; break;
case BR : m_material -= 5; break;
case BQ : m_material -= 9; break;
default : break;
}
}
m_material *= m_side_to_move;
} // end of calcMaterial
/**************************************************************
* read_from_fen
* Sets the board position from a FEN string
* Returns true on error.
***************************************************************/
bool CBoard::read_from_fen(const char *fen, const char **endptr)
{
unsigned int pos = 91;
unsigned int strpos = 0;
enum {st_board, st_sideToMove, st_castling, st_enpassant, st_halfmove, st_fullmove, st_finished}
state = st_board;
m_castleRights = 0;
m_side_to_move = 0;
m_enPassantSquare = 0;
unsigned int len = strlen(fen);
while (strpos < len and state != st_finished)
{
switch (state)
{
case st_board :
switch (fen[strpos])
{
case 'k' : m_board[pos++] = BK; break;
case 'q' : m_board[pos++] = BQ; break;
case 'r' : m_board[pos++] = BR; break;
case 'b' : m_board[pos++] = BB; break;
case 'n' : m_board[pos++] = BN; break;
case 'p' : m_board[pos++] = BP; break;
case 'K' : m_board[pos++] = WK; break;
case 'Q' : m_board[pos++] = WQ; break;
case 'R' : m_board[pos++] = WR; break;
case 'B' : m_board[pos++] = WB; break;
case 'N' : m_board[pos++] = WN; break;
case 'P' : m_board[pos++] = WP; break;
case '/' :
if ((pos % 10) != 9)
{
return true;
}
pos -= 18;
break;
case '1' :
case '2' :
case '3' :
case '4' :
case '5' :
case '6' :
case '7' :
case '8' : {
int count = fen[strpos] - '0';
while (count > 0)
{
if ((pos % 10) > 9)
{
return true;
}
m_board[pos++] = EM;
count--;
}
}
break;
case ' ' :
if (pos != 29)
{
return true;
}
state = st_sideToMove;
break;
default : return true;
} // end of switch
break;
case st_sideToMove :
switch (fen[strpos])
{
case 'b' : m_side_to_move = -1; break;
case 'w' : m_side_to_move = 1; break;
case ' ' : if (m_side_to_move == 0)
return true;
state = st_castling;
break;
default : return true;
}
break;
case st_castling :
switch (fen[strpos])
{
case 'K' : m_castleRights |= CASTLE_WHITE_SHORT; break;
case 'Q' : m_castleRights |= CASTLE_WHITE_LONG; break;
case 'k' : m_castleRights |= CASTLE_BLACK_SHORT; break;
case 'q' : m_castleRights |= CASTLE_BLACK_LONG; break;
case ' ' : state = st_enpassant; break;
case '-' : break;
default : return true;
}
break;
case st_enpassant :
switch (fen[strpos])
{
case 'a' :
case 'b' :
case 'c' :
case 'd' :
case 'e' :
case 'f' :
case 'g' :
case 'h' : m_enPassantSquare = (fen[strpos] - 'a') + 21; break;
case '1' :
case '2' :
case '3' :
case '4' :
case '5' :
case '6' :
case '7' :
case '8' : m_enPassantSquare += (fen[strpos] - '1')*10; break;
case ' ' : state = st_halfmove; break;
case '-' : break;
default : return true;
}
break;
case st_halfmove :
{
char *endp;
switch (fen[strpos])
{
case '0' :
case '1' :
case '2' :
case '3' :
case '4' :
case '5' :
case '6' :
case '7' :
case '8' :
case '9' : m_halfMoves = strtol(&fen[strpos], &endp, 10);
strpos = endp-fen;
break;
case ' ' : state = st_fullmove; break;
default : state = st_finished; strpos--; break;
}
}
break;
case st_fullmove :
{
char *endp;
switch (fen[strpos])
{
case '0' :
case '1' :
case '2' :
case '3' :
case '4' :
case '5' :
case '6' :
case '7' :
case '8' :
case '9' : m_fullMoves = strtol(&fen[strpos], &endp, 10);
strpos = endp-fen;
break;
case ' ' : state = st_finished; break;
default : state = st_finished;
}
}
break;
default : // case st_finished :
break;
} // end of switch
strpos++;
} // end of while
if (state == st_finished &&
(m_enPassantSquare == 0 || CSquare(m_enPassantSquare).isValid()))
{
if (fen[strpos] >= '0' and fen[strpos] <= '9')
{
}
calcMaterial();
if (endptr)
*endptr = &fen[strpos];
return false;
}
return true;
} // end of read_from_fen
/***************************************************************
* readMove
***************************************************************/
CMove CBoard::readMove(const char *p, const char **endptr) const
{
CMove ret;
CMoveList moves;
find_legal_moves(moves);
// Handle castling
if (p[0] == 'O' and p[1] == '-' and p[2] == 'O')
{
if (m_side_to_move > 0)
{
ret = CMove(WK, E1, G1);
}
else
{
ret = CMove(BK, E8, G8);
}
p+=3;
if (p[0] == '-' and p[1] == 'O')
{
if (m_side_to_move > 0)
{
ret = CMove(WK, E1, C1);
}
else
{
ret = CMove(BK, E8, C8);
}
p+=2;
}
}
else
{
int piece = WP;
switch (p[0])
{
case 'N' : piece = WN; ++p; break;
case 'B' : piece = WB; ++p; break;
case 'R' : piece = WR; ++p; break;
case 'Q' : piece = WQ; ++p; break;
case 'K' : piece = WK; ++p; break;
default : break;
}
if (m_side_to_move < 0)
piece = -piece;
int disambRow = 0;
int disambCol = 0;
if ((p[1] >= 'a' and p[1] <= 'h' and p[0] != 'x') or p[1] == 'x')
{
if (p[0] >= 'a' and p[0] <= 'h')
disambCol = p[0] - 'a' + 1;
else if (p[0] >= '1' and p[0] <= '8')
disambRow = p[0] - '1' + 1;
else return ret;
++p;
}
if (p[0] == 'x')
++p;
CSquare targetSq;
if (targetSq.FromString(p))
return ret;
p += 2;
int promotion = 0;
if (p[0] == '=')
{
++p;
switch (p[0])
{
case 'N' : promotion = WN; ++p; break;
case 'B' : promotion = WB; ++p; break;
case 'R' : promotion = WR; ++p; break;
case 'Q' : promotion = WQ; ++p; break;
default : return ret;
}
}
if (m_side_to_move < 0)
promotion = -promotion;
int numMoves = moves.size();
for (int i=0; i<numMoves; ++i)
{
ret = moves[i];
if (ret.GetPiece() != piece)
continue;
if (ret.To() != targetSq)
continue;
if (ret.GetPromoted() != promotion)
continue;
if (disambCol && disambCol != ret.From().col())
continue;
if (disambRow && disambRow != ret.From().row())
continue;
break;
}
} // end of if else
if (p[0] == '+' or p[0] == '#')
++p;
if (endptr)
*endptr = p;
return ret;
} // end of readMove
/***************************************************************
* isSquareThreatened
* Returns true if OTHER side to move threatens this square
***************************************************************/
bool CBoard::isSquareThreatened(const CSquare& sq) const
{
if (m_side_to_move > 0)
{
// Check for pawns
if (m_board[sq + NW] == BP || m_board[sq + NE] == BP)
return true;
// Check for knigts
{
int dirs[8] = {NNW, NNE, NWW, NEE, SSW, SSE, SWW, SEE};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
if (m_board[sq + dir] == BN)
return true;
}
}
// Check for diagonal (bishop and queen)
{
int dirs[4] = {NW, NE, SW, SE};
for (int k=0; k<4; ++k)
{
int dir = dirs[k];
int sq2 = sq;
while (1)
{
sq2 += dir;
if (m_board[sq2] == BB || m_board[sq2] == BQ)
return true;
if (m_board[sq2] != EM)
break;
}
}
}
// Check for horizontal/vertical (rook and queen)
{
int dirs[4] = {N, S, W, E};
for (int k=0; k<4; ++k)
{
int dir = dirs[k];
int sq2 = sq;
while (1)
{
sq2 += dir;
if (m_board[sq2] == BR || m_board[sq2] == BQ)
return true;
if (m_board[sq2] != EM)
break;
}
}
}
// Check for king
{
int dirs[8] = {NW, NE, SW, SE, N, S, W, E};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
if (m_board[sq + dir] == BK)
return true;
}
}
}
else
{
// Check for pawns
if (m_board[sq + SW] == WP || m_board[sq + SE] == WP)
return true;
// Check for knigts
{
int dirs[8] = {NNW, NNE, NWW, NEE, SSW, SSE, SWW, SEE};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
if (m_board[sq + dir] == WN)
return true;
}
}
// Check for diagonal (bishop and queen)
{
int dirs[4] = {NW, NE, SW, SE};
for (int k=0; k<4; ++k)
{
int dir = dirs[k];
int sq2 = sq;
while (1)
{
sq2 += dir;
if (m_board[sq2] == WB || m_board[sq2] == WQ)
return true;
if (m_board[sq2] != EM)
break;
}
}
}
// Check for horizontal/vertical (rook and queen)
{
int dirs[4] = {N, S, W, E};
for (int k=0; k<4; ++k)
{
int dir = dirs[k];
int sq2 = sq;
while (1)
{
sq2 += dir;
if (m_board[sq2] == WR || m_board[sq2] == WQ)
return true;
if (m_board[sq2] != EM)
break;
}
}
}
// Check for king
{
int dirs[8] = {NW, NE, SW, SE, N, S, W, E};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
if (m_board[sq + dir] == WK)
return true;
}
}
}
return false;
} // end of isSquareThreatened
/***************************************************************
* find_legal_moves
* This generates a complete list of all pseudo-legal moves.
* A pseudo-legal move does not consider, whether the king will
* be in check. This is handled else-where.
***************************************************************/
void CBoard::find_legal_moves(CMoveList &moves) const
{
moves.clear();
if (m_side_to_move > 0)
for (int i=A1; i<=H8; ++i)
{
int8_t piece = m_board[i];
int j;
switch (piece)
{
case WP :
j = i + 10;
if (m_board[j] == EM)
{
if (i > 80)
{
{
CMove move(piece, i, j, EM, WQ);
moves.push_back(move);
}
{
CMove move(piece, i, j, EM, WR);
moves.push_back(move);
}
{
CMove move(piece, i, j, EM, WB);
moves.push_back(move);
}
{
CMove move(piece, i, j, EM, WN);
moves.push_back(move);
}
}
else
{
CMove move(piece, i, j, EM);
moves.push_back(move);
}
j = i + 20;
if (m_board[j] == EM)
{
if (i < 40)
{
CMove move(piece, i, j, EM);
moves.push_back(move);
}
}
}
j = i + 9;
if ((m_board[j] != IV && m_board[j] < 0) || j == m_enPassantSquare)
{
if (i > 80)
{
{
CMove move(piece, i, j, m_board[j], WQ);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], WR);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], WB);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], WN);
moves.push_back(move);
}
}
else
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
}
}
j = i + 11;
if ((m_board[j] != IV && m_board[j] < 0) || j == m_enPassantSquare)
{
if (i > 80)
{
{
CMove move(piece, i, j, m_board[j], WQ);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], WR);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], WB);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], WN);
moves.push_back(move);
}
}
else
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
}
}
break;
case WN :
{
int dirs[8] = {NNW, NNE, NWW, NEE, SSW, SSE, SWW, SEE};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
j = i+dir;
if (m_board[j] != IV)
if (m_board[j] <= 0)
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
}
}
}
break;
case WB :
{
int dirs[4] = {NW, NE, SW, SE};
for (int k=0; k<4; ++k)
{
int dir = dirs[k];
j = i;
while (1)
{
j += dir;
if (m_board[j] == IV) break;
if (m_board[j] <= 0)
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
if (m_board[j] < 0)
break;
}
else
break;
}
}
}
break;
case WR :
{
int dirs[4] = {N, W, S, E};
for (int k=0; k<4; ++k)
{
int dir = dirs[k];
j = i;
while (1)
{
j += dir;
if (m_board[j] == IV) break;
if (m_board[j] <= 0)
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
if (m_board[j] < 0)
break;
}
else
break;
}
}
}
break;
case WQ :
{
int dirs[8] = {N, W, S, E, NW, NE, SW, SE};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
j = i;
while (1)
{
j += dir;
if (m_board[j] == IV) break;
if (m_board[j] <= 0)
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
if (m_board[j] < 0)
break;
}
else
break;
}
}
}
break;
case WK :
{
int dirs[8] = {N, W, S, E, NW, NE, SW, SE};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
j = i+dir;
if (m_board[j] != IV)
if (m_board[j] <= 0)
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
}
}
if (m_castleRights & CASTLE_WHITE_SHORT)
{ // Then King and Rook must be in place
if (m_board[F1] == EM && m_board[G1] == EM)
{
if (!isSquareThreatened(E1) && !isSquareThreatened(F1))
{
CMove move(WK, E1, G1);
moves.push_back(move);
}
}
}
if (m_castleRights & CASTLE_WHITE_LONG)
{ // Then King and Rook must be in place
if (m_board[B1] == EM && m_board[C1] == EM && m_board[D1] == EM)
{
if (!isSquareThreatened(E1) && !isSquareThreatened(D1))
{
CMove move(WK, E1, C1);
moves.push_back(move);
}
}
}
}
break;
default : // Invalid, wrong color, or empty
continue;
}
}
else
for (int i=A1; i<=H8; ++i)
{
int8_t piece = m_board[i];
int j;
switch (piece)
{
case BP :
j = i - 10;
if (m_board[j] == EM)
{
if (i < 40)
{
{
CMove move(piece, i, j, EM, BQ);
moves.push_back(move);
}
{
CMove move(piece, i, j, EM, BR);
moves.push_back(move);
}
{
CMove move(piece, i, j, EM, BB);
moves.push_back(move);
}
{
CMove move(piece, i, j, EM, BN);
moves.push_back(move);
}
}
else
{
CMove move(piece, i, j, EM);
moves.push_back(move);
}
j = i - 20;
if (m_board[j] == EM)
{
if (i > 80)
{
CMove move(piece, i, j, EM);
moves.push_back(move);
}
}
}
j = i - 9;
if ((m_board[j] != IV && m_board[j] > 0) || j == m_enPassantSquare)
{
if (i < 40)
{
{
CMove move(piece, i, j, m_board[j], BQ);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], BR);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], BB);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], BN);
moves.push_back(move);
}
}
else
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
}
}
j = i - 11;
if ((m_board[j] != IV && m_board[j] > 0) || j == m_enPassantSquare)
{
if (i < 40)
{
{
CMove move(piece, i, j, m_board[j], BQ);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], BR);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], BB);
moves.push_back(move);
}
{
CMove move(piece, i, j, m_board[j], BN);
moves.push_back(move);
}
}
else
{
CMove move(piece, i, j, m_board[j]);
moves.push_back(move);
}
}
break;
case BN :
{
int dirs[8] = {NNW, NNE, NWW, NEE, SSW, SSE, SWW, SEE};
for (int k=0; k<8; ++k)
{
int dir = dirs[k];
j = i+dir;
if (m_board[j] != IV)
if (m_board[j] >= 0)
{
CMove move(piece, i, j, m_board[j]);