static void pawn_comp_info(pawn_info_t * info, const board_t * board) {
int colour;
int file, rank;
int me, opp;
const sq_t * ptr;
int sq;
bool backward, candidate, doubled, isolated, open, passed;
int t1, t2;
int n;
int bits;
int opening[ColourNb], endgame[ColourNb];
int flags[ColourNb];
int file_bits[ColourNb];
int passed_bits[ColourNb];
int single_file[ColourNb];
ASSERT(info!=NULL);
ASSERT(board!=NULL);
// pawn_file[]
#if DEBUG
for (colour = 0; colour < ColourNb; colour++) {
int pawn_file[FileNb];
me = colour;
for (file = 0; file < FileNb; file++) {
pawn_file[file] = 0;
}
for (ptr = &board->pawn[me][0]; (sq=*ptr) != SquareNone; ptr++) {
file = SQUARE_FILE(sq);
rank = PAWN_RANK(sq,me);
ASSERT(file>=FileA&&file<=FileH);
ASSERT(rank>=Rank2&&rank<=Rank7);
pawn_file[file] |= BIT(rank);
}
for (file = 0; file < FileNb; file++) {
if (board->pawn_file[colour][file] != pawn_file[file]) my_fatal("board->pawn_file[][]\n");
}
}
#endif
// init
for (colour = 0; colour < ColourNb; colour++) {
opening[colour] = 0;
endgame[colour] = 0;
flags[colour] = 0;
file_bits[colour] = 0;
passed_bits[colour] = 0;
single_file[colour] = SquareNone;
}
// features and scoring
for (colour = 0; colour < ColourNb; colour++) {
me = colour;
opp = COLOUR_OPP(me);
for (ptr = &board->pawn[me][0]; (sq=*ptr) != SquareNone; ptr++) {
// init
file = SQUARE_FILE(sq);
rank = PAWN_RANK(sq,me);
ASSERT(file>=FileA&&file<=FileH);
ASSERT(rank>=Rank2&&rank<=Rank7);
// flags
file_bits[me] |= BIT(file);
if (rank == Rank2) flags[me] |= BackRankFlag;
// features
backward = false;
candidate = false;
doubled = false;
isolated = false;
open = false;
passed = false;
t1 = board->pawn_file[me][file-1] | board->pawn_file[me][file+1];
t2 = board->pawn_file[me][file] | BitRev[board->pawn_file[opp][file]];
// doubled
if ((board->pawn_file[me][file] & BitLT[rank]) != 0) {
doubled = true;
}
// isolated and backward
if (t1 == 0) {
isolated = true;
} else if ((t1 & BitLE[rank]) == 0) {
backward = true;
// really backward?
if ((t1 & BitRank1[rank]) != 0) {
ASSERT(rank+2<=Rank8);
if (((t2 & BitRank1[rank])
| ((BitRev[board->pawn_file[opp][file-1]] | BitRev[board->pawn_file[opp][file+1]]) & BitRank2[rank])) == 0) {
backward = false;
}
} else if (rank == Rank2 && ((t1 & BitEQ[rank+2]) != 0)) {
ASSERT(rank+3<=Rank8);
if (((t2 & BitRank2[rank])
| ((BitRev[board->pawn_file[opp][file-1]] | BitRev[board->pawn_file[opp][file+1]]) & BitRank3[rank])) == 0) {
backward = false;
}
}
}
// open, candidate and passed
if ((t2 & BitGT[rank]) == 0) {
open = true;
if (((BitRev[board->pawn_file[opp][file-1]] | BitRev[board->pawn_file[opp][file+1]]) & BitGT[rank]) == 0) {
passed = true;
passed_bits[me] |= BIT(file);
} else {
// candidate?
n = 0;
n += BIT_COUNT(board->pawn_file[me][file-1]&BitLE[rank]);
n += BIT_COUNT(board->pawn_file[me][file+1]&BitLE[rank]);
n -= BIT_COUNT(BitRev[board->pawn_file[opp][file-1]]&BitGT[rank]);
n -= BIT_COUNT(BitRev[board->pawn_file[opp][file+1]]&BitGT[rank]);
if (n >= 0) {
// safe?
n = 0;
n += BIT_COUNT(board->pawn_file[me][file-1]&BitEQ[rank-1]);
n += BIT_COUNT(board->pawn_file[me][file+1]&BitEQ[rank-1]);
n -= BIT_COUNT(BitRev[board->pawn_file[opp][file-1]]&BitEQ[rank+1]);
n -= BIT_COUNT(BitRev[board->pawn_file[opp][file+1]]&BitEQ[rank+1]);
if (n >= 0) candidate = true;
}
}
}
// outposts
if (me == White) {
if (SQUARE_IS_OK(sq+15)) {
if (WEAK_SQUARE_BLACK(sq+15)) opening[White] += OutpostMatrix[White][SQUARE_TO_64(sq+15)];
else opening[White] += (OutpostMatrix[White][SQUARE_TO_64(sq+15)]+1)/2;
}
if (SQUARE_IS_OK(sq+17)) {
if (WEAK_SQUARE_BLACK(sq+17)) opening[White] += OutpostMatrix[White][SQUARE_TO_64(sq+17)];
else opening[White] += (OutpostMatrix[White][SQUARE_TO_64(sq+17)]+1)/2;
}
} else {
if (SQUARE_IS_OK(sq-15)) {
if (WEAK_SQUARE_WHITE(sq-15)) opening[Black] += OutpostMatrix[Black][SQUARE_TO_64(sq-15)];
else opening[Black] += (OutpostMatrix[Black][SQUARE_TO_64(sq-15)]+1)/2;
}
if (SQUARE_IS_OK(sq-17)) {
if (WEAK_SQUARE_WHITE(sq-17)) opening[Black] += OutpostMatrix[Black][SQUARE_TO_64(sq-17)];
else opening[Black] += (OutpostMatrix[Black][SQUARE_TO_64(sq-17)]+1)/2;
}
}
// score
if (doubled) {
opening[me] -= DoubledOpening;
endgame[me] -= DoubledEndgame;
}
if (isolated) {
if (open) {
opening[me] -= IsolatedOpeningOpen;
endgame[me] -= IsolatedEndgame;
} else {
opening[me] -= IsolatedOpening;
endgame[me] -= IsolatedEndgame;
}
}
if (backward) {
if (open) {
opening[me] -= BackwardOpeningOpen;
endgame[me] -= BackwardEndgame;
} else {
opening[me] -= BackwardOpening;
endgame[me] -= BackwardEndgame;
}
}
if (candidate) {
opening[me] += quad(CandidateOpeningMin,CandidateOpeningMax,rank);
endgame[me] += quad(CandidateEndgameMin,CandidateEndgameMax,rank);
}
// this was moved to the dynamic evaluation
/*
if (passed) {
opening[me] += quad(PassedOpeningMin,PassedOpeningMax,rank);
endgame[me] += quad(PassedEndgameMin,PassedEndgameMax,rank);
}
*/
}
}
// store info
info->opening = ((opening[White] - opening[Black]) * PawnStructureWeight) / 256;
info->endgame = ((endgame[White] - endgame[Black]) * PawnStructureWeight) / 256;
for (colour = 0; colour < ColourNb; colour++) {
me = colour;
opp = COLOUR_OPP(me);
// draw flags
bits = file_bits[me];
if (bits != 0 && (bits & (bits-1)) == 0) { // one set bit
file = BIT_FIRST(bits);
rank = BIT_FIRST(board->pawn_file[me][file]);
ASSERT(rank>=Rank2);
if (((BitRev[board->pawn_file[opp][file-1]] | BitRev[board->pawn_file[opp][file+1]]) & BitGT[rank]) == 0) {
rank = BIT_LAST(board->pawn_file[me][file]);
single_file[me] = SQUARE_MAKE(file,rank);
}
}
info->flags[colour] = flags[colour];
info->passed_bits[colour] = passed_bits[colour];
info->single_file[colour] = single_file[colour];
}
}
static void square_clear(board_t * board, int square, int piece, bool update) {
int pos, piece_12, colour;
int sq;
int i, size;
int sq_64;
uint64 hash_xor;
ASSERT(board!=NULL);
ASSERT(SQUARE_IS_OK(square));
ASSERT(piece_is_ok(piece));
ASSERT(update==true||update==false);
// init
pos = board->pos[square];
ASSERT(pos>=0);
piece_12 = PIECE_TO_12(piece);
colour = PIECE_COLOUR(piece);
// square
ASSERT(board->square[square]==piece);
board->square[square] = Empty;
// piece list
if (!PIECE_IS_PAWN(piece)) {
// init
size = board->piece_size[colour];
ASSERT(size>=1);
// stable swap
ASSERT(pos>=0&&pos<size);
ASSERT(board->pos[square]==pos);
board->pos[square] = -1;
for (i = pos; i < size-1; i++) {
sq = board->piece[colour][i+1];
board->piece[colour][i] = sq;
ASSERT(board->pos[sq]==i+1);
board->pos[sq] = i;
}
// size
size--;
board->piece[colour][size] = SquareNone;
board->piece_size[colour] = size;
} else {
// init
size = board->pawn_size[colour];
ASSERT(size>=1);
// stable swap
ASSERT(pos>=0&&pos<size);
ASSERT(board->pos[square]==pos);
board->pos[square] = -1;
for (i = pos; i < size-1; i++) {
sq = board->pawn[colour][i+1];
board->pawn[colour][i] = sq;
ASSERT(board->pos[sq]==i+1);
board->pos[sq] = i;
}
// size
size--;
board->pawn[colour][size] = SquareNone;
board->pawn_size[colour] = size;
// pawn "bitboard"
board->pawn_file[colour][SQUARE_FILE(square)] ^= BIT(PAWN_RANK(square,colour));
}
// material
ASSERT(board->piece_nb>0);
board->piece_nb--;
ASSERT(board->number[piece_12]>0);
board->number[piece_12]--;
// update
if (update) {
// init
sq_64 = SQUARE_TO_64(square);
// PST
board->opening -= PST(piece_12,sq_64,Opening);
board->endgame -= PST(piece_12,sq_64,Endgame);
// hash key
hash_xor = RANDOM_64(RandomPiece+(piece_12^1)*64+sq_64); // HACK: ^1 for PolyGlot book
board->key ^= hash_xor;
if (PIECE_IS_PAWN(piece)) board->pawn_key ^= hash_xor;
// material key
board->material_key ^= RANDOM_64(piece_12*16+board->number[piece_12]);
}
}
bool board_is_ok(const board_t * board) {
int sq, piece, colour;
int size, pos;
if (board == NULL) return false;
// optional heavy DEBUG mode
if (!UseSlowDebug) return true;
// squares
for (sq = 0; sq < SquareNb; sq++) {
piece = board->square[sq];
pos = board->pos[sq];
if (SQUARE_IS_OK(sq)) {
// inside square
if (piece == Empty) {
if (pos != -1) return false;
} else {
if (!piece_is_ok(piece)) return false;
if (!PIECE_IS_PAWN(piece)) {
colour = PIECE_COLOUR(piece);
if (pos < 0 || pos >= board->piece_size[colour]) return false;
if (board->piece[colour][pos] != sq) return false;
} else { // pawn
if (SQUARE_IS_PROMOTE(sq)) return false;
colour = PIECE_COLOUR(piece);
if (pos < 0 || pos >= board->pawn_size[colour]) return false;
if (board->pawn[colour][pos] != sq) return false;
}
}
} else {
// edge square
if (piece != Edge) return false;
if (pos != -1) return false;
}
}
// piece lists
for (colour = 0; colour < ColourNb; colour++) {
// piece list
size = board->piece_size[colour];
if (size < 1 || size > 16) return false;
for (pos = 0; pos < size; pos++) {
sq = board->piece[colour][pos];
if (!SQUARE_IS_OK(sq)) return false;
if (board->pos[sq] != pos) return false;
piece = board->square[sq];
if (!COLOUR_IS(piece,colour)) return false;
if (pos == 0 && !PIECE_IS_KING(piece)) return false;
if (pos != 0 && PIECE_IS_KING(piece)) return false;
if (pos != 0 && PIECE_ORDER(piece) > PIECE_ORDER(board->square[board->piece[colour][pos-1]])) {
return false;
}
}
sq = board->piece[colour][size];
if (sq != SquareNone) return false;
// pawn list
size = board->pawn_size[colour];
if (size < 0 || size > 8) return false;
for (pos = 0; pos < size; pos++) {
sq = board->pawn[colour][pos];
if (!SQUARE_IS_OK(sq)) return false;
if (SQUARE_IS_PROMOTE(sq)) return false;
if (board->pos[sq] != pos) return false;
piece = board->square[sq];
if (!COLOUR_IS(piece,colour)) return false;
if (!PIECE_IS_PAWN(piece)) return false;
}
sq = board->pawn[colour][size];
if (sq != SquareNone) return false;
// piece total
if (board->piece_size[colour] + board->pawn_size[colour] > 16) return false;
}
// material
if (board->piece_nb != board->piece_size[White] + board->pawn_size[White]
+ board->piece_size[Black] + board->pawn_size[Black]) {
return false;
}
if (board->number[WhitePawn12] != board->pawn_size[White]) return false;
if (board->number[BlackPawn12] != board->pawn_size[Black]) return false;
if (board->number[WhiteKing12] != 1) return false;
if (board->number[BlackKing12] != 1) return false;
// misc
if (!COLOUR_IS_OK(board->turn)) return false;
if (board->ply_nb < 0) return false;
if (board->sp < board->ply_nb) return false;
if (board->cap_sq != SquareNone && !SQUARE_IS_OK(board->cap_sq)) return false;
if (board->opening != board_opening(board)) return false;
if (board->endgame != board_endgame(board)) return false;
if (board->key != hash_key(board)) return false;
if (board->pawn_key != hash_pawn_key(board)) return false;
if (board->material_key != hash_material_key(board)) return false;
return true;
}
bool move_is_pseudo(int move, board_t * board) {
int me, opp;
int from, to;
int piece, capture;
int inc, delta;
ASSERT(move_is_ok(move));
ASSERT(board!=NULL);
ASSERT(!board_is_check(board));
// special cases
if (MOVE_IS_SPECIAL(move)) {
return move_is_pseudo_debug(move,board);
}
ASSERT((move&~07777)==0);
// init
me = board->turn;
opp = COLOUR_OPP(board->turn);
// from
from = MOVE_FROM(move);
ASSERT(SQUARE_IS_OK(from));
piece = board->square[from];
if (!COLOUR_IS(piece,me)) return false;
ASSERT(piece_is_ok(piece));
// to
to = MOVE_TO(move);
ASSERT(SQUARE_IS_OK(to));
capture = board->square[to];
if (COLOUR_IS(capture,me)) return false;
// move
if (PIECE_IS_PAWN(piece)) {
if (SQUARE_IS_PROMOTE(to)) return false;
inc = PAWN_MOVE_INC(me);
delta = to - from;
ASSERT(delta_is_ok(delta));
if (capture == Empty) {
// pawn push
if (delta == inc) return true;
if (delta == (2*inc)
&& PAWN_RANK(from,me) == Rank2
&& board->square[from+inc] == Empty) {
return true;
}
} else {
// pawn capture
if (delta == (inc-1) || delta == (inc+1)) return true;
}
} else {
if (PIECE_ATTACK(board,piece,from,to)) return true;
}
return false;
}
static bool kpk_draw(int wp, int wk, int bk, int turn) {
int wp_file, wp_rank;
int wk_file;
int bk_file, bk_rank;
ASSERT(SQUARE_IS_OK(wp));
ASSERT(SQUARE_IS_OK(wk));
ASSERT(SQUARE_IS_OK(bk));
ASSERT(COLOUR_IS_OK(turn));
ASSERT(SQUARE_FILE(wp)<=FileD);
wp_file = SQUARE_FILE(wp);
wp_rank = SQUARE_RANK(wp);
wk_file = SQUARE_FILE(wk);
bk_file = SQUARE_FILE(bk);
bk_rank = SQUARE_RANK(bk);
if (false) {
} else if (bk == wp+16) {
if (wp_rank <= Rank6) {
return true;
} else {
ASSERT(wp_rank==Rank7);
if (COLOUR_IS_WHITE(turn)) {
if (wk == wp-15 || wk == wp-17) return true;
} else {
if (wk != wp-15 && wk != wp-17) return true;
}
}
} else if (bk == wp+32) {
if (wp_rank <= Rank5) {
return true;
} else {
ASSERT(wp_rank==Rank6);
if (COLOUR_IS_WHITE(turn)) {
if (wk != wp-1 && wk != wp+1) return true;
} else {
return true;
}
}
} else if (wk == wp-1 || wk == wp+1) {
if (bk == wk+32 && COLOUR_IS_WHITE(turn)) { // opposition
return true;
}
} else if (wk == wp+15 || wk == wp+16 || wk == wp+17) {
if (wp_rank <= Rank4) {
if (bk == wk+32 && COLOUR_IS_WHITE(turn)) { // opposition
return true;
}
}
}
// rook pawn
if (wp_file == FileA) {
if (DISTANCE(bk,A8) <= 1) return true;
if (wk_file == FileA) {
if (wp_rank == Rank2) wp_rank++; // HACK
if (bk_file == FileC && bk_rank > wp_rank) return true;
}
}
return false;
}
static void square_move(board_t * board, int from, int to, int piece, bool update) {
int colour;
int pos;
int from_64, to_64;
int piece_12;
int piece_index;
uint64 hash_xor;
ASSERT(board!=NULL);
ASSERT(SQUARE_IS_OK(from));
ASSERT(SQUARE_IS_OK(to));
ASSERT(piece_is_ok(piece));
ASSERT(update==true||update==false);
// init
colour = PIECE_COLOUR(piece);
pos = board->pos[from];
ASSERT(pos>=0);
// from
ASSERT(board->square[from]==piece);
board->square[from] = Empty;
ASSERT(board->pos[from]==pos);
board->pos[from] = -1; // not needed
// to
ASSERT(board->square[to]==Empty);
board->square[to] = piece;
ASSERT(board->pos[to]==-1);
board->pos[to] = pos;
// piece list
if (!PIECE_IS_PAWN(piece)) {
ASSERT(board->piece[colour][pos]==from);
board->piece[colour][pos] = to;
} else {
ASSERT(board->pawn[colour][pos]==from);
board->pawn[colour][pos] = to;
// pawn "bitboard"
board->pawn_file[colour][SQUARE_FILE(from)] ^= BIT(PAWN_RANK(from,colour));
board->pawn_file[colour][SQUARE_FILE(to)] ^= BIT(PAWN_RANK(to,colour));
}
// update
if (update) {
// init
from_64 = SQUARE_TO_64(from);
to_64 = SQUARE_TO_64(to);
piece_12 = PIECE_TO_12(piece);
// PST
board->opening += PST(piece_12,to_64,Opening) - PST(piece_12,from_64,Opening);
board->endgame += PST(piece_12,to_64,Endgame) - PST(piece_12,from_64,Endgame);
// hash key
piece_index = RandomPiece + (piece_12^1) * 64; // HACK: ^1 for PolyGlot book
hash_xor = RANDOM_64(piece_index+to_64) ^ RANDOM_64(piece_index+from_64);
board->key ^= hash_xor;
if (PIECE_IS_PAWN(piece)) board->pawn_key ^= hash_xor;
}
}
static void square_set(board_t * board, int square, int piece, int pos, bool update) {
int piece_12, colour;
int sq;
int i, size;
int sq_64;
uint64 hash_xor;
ASSERT(board!=NULL);
ASSERT(SQUARE_IS_OK(square));
ASSERT(piece_is_ok(piece));
ASSERT(pos>=0);
ASSERT(update==true||update==false);
// init
piece_12 = PIECE_TO_12(piece);
colour = PIECE_COLOUR(piece);
// square
ASSERT(board->square[square]==Empty);
board->square[square] = piece;
// piece list
if (!PIECE_IS_PAWN(piece)) {
// init
size = board->piece_size[colour];
ASSERT(size>=0);
// size
size++;
board->piece[colour][size] = SquareNone;
board->piece_size[colour] = size;
// stable swap
ASSERT(pos>=0&&pos<size);
for (i = size-1; i > pos; i--) {
sq = board->piece[colour][i-1];
board->piece[colour][i] = sq;
ASSERT(board->pos[sq]==i-1);
board->pos[sq] = i;
}
board->piece[colour][pos] = square;
ASSERT(board->pos[square]==-1);
board->pos[square] = pos;
} else {
// init
size = board->pawn_size[colour];
ASSERT(size>=0);
// size
size++;
board->pawn[colour][size] = SquareNone;
board->pawn_size[colour] = size;
// stable swap
ASSERT(pos>=0&&pos<size);
for (i = size-1; i > pos; i--) {
sq = board->pawn[colour][i-1];
board->pawn[colour][i] = sq;
ASSERT(board->pos[sq]==i-1);
board->pos[sq] = i;
}
board->pawn[colour][pos] = square;
ASSERT(board->pos[square]==-1);
board->pos[square] = pos;
// pawn "bitboard"
board->pawn_file[colour][SQUARE_FILE(square)] ^= BIT(PAWN_RANK(square,colour));
}
// material
ASSERT(board->piece_nb<32);
board->piece_nb++;;
ASSERT(board->number[piece_12]<9);
board->number[piece_12]++;
board->piece_material[colour] += VALUE_PIECE(piece); // Thomas
// update
if (update) {
// init
sq_64 = SQUARE_TO_64(square);
// PST
board->opening += PST(piece_12,sq_64,Opening);
board->endgame += PST(piece_12,sq_64,Endgame);
// hash key
hash_xor = RANDOM_64(RandomPiece+(piece_12^1)*64+sq_64); // HACK: ^1 for PolyGlot book
board->key ^= hash_xor;
if (PIECE_IS_PAWN(piece)) board->pawn_key ^= hash_xor;
// material key
board->material_key ^= RANDOM_64(piece_12*16+(board->number[piece_12]-1));
}
}
void attack_init() {
int delta, inc;
int piece;
int dir, dist;
int size;
int king;
int from, to;
int pos;
// clear
for (delta = 0; delta < DeltaNb; delta++) {
DeltaIncLine[delta] = IncNone;
DeltaIncAll[delta] = IncNone;
DeltaMask[delta] = 0;
}
for (inc = 0; inc < IncNb; inc++) {
IncMask[inc] = 0;
}
// pawn attacks
DeltaMask[DeltaOffset-17] |= BlackPawnFlag;
DeltaMask[DeltaOffset-15] |= BlackPawnFlag;
DeltaMask[DeltaOffset+15] |= WhitePawnFlag;
DeltaMask[DeltaOffset+17] |= WhitePawnFlag;
// knight attacks
for (dir = 0; dir < 8; dir++) {
delta = KnightInc[dir];
ASSERT(delta_is_ok(delta));
ASSERT(DeltaIncAll[DeltaOffset+delta]==IncNone);
DeltaIncAll[DeltaOffset+delta] = delta;
DeltaMask[DeltaOffset+delta] |= KnightFlag;
}
// bishop/queen attacks
for (dir = 0; dir < 4; dir++) {
inc = BishopInc[dir];
ASSERT(inc!=IncNone);
IncMask[IncOffset+inc] |= BishopFlag;
for (dist = 1; dist < 8; dist++) {
delta = inc*dist;
ASSERT(delta_is_ok(delta));
ASSERT(DeltaIncLine[DeltaOffset+delta]==IncNone);
DeltaIncLine[DeltaOffset+delta] = inc;
ASSERT(DeltaIncAll[DeltaOffset+delta]==IncNone);
DeltaIncAll[DeltaOffset+delta] = inc;
DeltaMask[DeltaOffset+delta] |= BishopFlag;
}
}
// rook/queen attacks
for (dir = 0; dir < 4; dir++) {
inc = RookInc[dir];
ASSERT(inc!=IncNone);
IncMask[IncOffset+inc] |= RookFlag;
for (dist = 1; dist < 8; dist++) {
delta = inc*dist;
ASSERT(delta_is_ok(delta));
ASSERT(DeltaIncLine[DeltaOffset+delta]==IncNone);
DeltaIncLine[DeltaOffset+delta] = inc;
ASSERT(DeltaIncAll[DeltaOffset+delta]==IncNone);
DeltaIncAll[DeltaOffset+delta] = inc;
DeltaMask[DeltaOffset+delta] |= RookFlag;
}
}
// king attacks
for (dir = 0; dir < 8; dir++) {
delta = KingInc[dir];
ASSERT(delta_is_ok(delta));
DeltaMask[DeltaOffset+delta] |= KingFlag;
}
// PieceCode[]
for (piece = 0; piece < PieceNb; piece++) {
PieceCode[piece] = -1;
}
PieceCode[WN] = 0;
PieceCode[WB] = 1;
PieceCode[WR] = 2;
PieceCode[WQ] = 3;
PieceCode[BN] = 0;
PieceCode[BB] = 1;
PieceCode[BR] = 2;
PieceCode[BQ] = 3;
// PieceDeltaSize[][] & PieceDeltaDelta[][][]
for (piece = 0; piece < 4; piece++) {
for (delta = 0; delta < 256; delta++) {
PieceDeltaSize[piece][delta] = 0;
}
}
for (king = 0; king < SquareNb; king++) {
if (SQUARE_IS_OK(king)) {
for (from = 0; from < SquareNb; from++) {
if (SQUARE_IS_OK(from)) {
// knight
for (pos = 0; (inc=KnightInc[pos]) != IncNone; pos++) {
to = from + inc;
if (SQUARE_IS_OK(to) && DISTANCE(to,king) == 1) {
add_attack(0,king-from,to-from);
}
}
// bishop
for (pos = 0; (inc=BishopInc[pos]) != IncNone; pos++) {
for (to = from+inc; SQUARE_IS_OK(to); to += inc) {
if (DISTANCE(to,king) == 1) {
add_attack(1,king-from,to-from);
break;
}
}
}
// rook
for (pos = 0; (inc=RookInc[pos]) != IncNone; pos++) {
for (to = from+inc; SQUARE_IS_OK(to); to += inc) {
if (DISTANCE(to,king) == 1) {
add_attack(2,king-from,to-from);
break;
}
}
}
// queen
for (pos = 0; (inc=QueenInc[pos]) != IncNone; pos++) {
for (to = from+inc; SQUARE_IS_OK(to); to += inc) {
if (DISTANCE(to,king) == 1) {
add_attack(3,king-from,to-from);
break;
}
}
}
}
}
}
}
for (piece = 0; piece < 4; piece++) {
for (delta = 0; delta < 256; delta++) {
size = PieceDeltaSize[piece][delta];
ASSERT(size>=0&&size<3);
PieceDeltaDelta[piece][delta][size] = DeltaNone;
}
}
}
uint64 hash_ep_key(int square) {
ASSERT(SQUARE_IS_OK(square));
return RANDOM_64(RandomEnPassant+SQUARE_FILE(square)-FileA);
}
