int eval( int alpha, int beta) {
int opening, endgame;
int phase;
int eval;
material_info_t mat_info[1];
opening = 0;
endgame = 0;
// material
material_get_info(mat_info);
opening += mat_info->opening;
endgame += mat_info->endgame;
// PST
opening += Opening;
endgame += Endgame;
phase = mat_info->phase;
eval = ((opening * (256 - phase)) + (endgame * phase)) / 256;
if (COLOUR_IS_BLACK(Turn)) eval = -eval;
return eval;
}
bool recog_draw( const board_t *board, int ThreadId )
{
material_info_t mat_info[1];
ASSERT(board != NULL);
if( board->number[RedRook] + board->number[RedKnight] + board->number[RedCannon] > 1 )
return false;
if(board->number[BlackRook] + board->number[BlackKnight] + board->number[BlackCannon] > 1)
return false;
if(board->number[RedPawn] > 2 || board->number[BlackPawn] > 2)
return false;
// material
material_get_info(mat_info, board, ThreadId);
if(mat_info->recog == MAT_KK)
return true;
else if(mat_info->recog == MAT_KABKAB)
return true;
else if(mat_info->recog == MAT_KPKAB || mat_info->recog == MAT_KABKP)
return true;
else if(mat_info->recog == MAT_KABKR || mat_info->recog == MAT_KRKAB)
return true;
else if(mat_info->recog == MAT_KNKN)
return true;
else if(mat_info->recog == MAT_KCKC)
return true;
else if(mat_info->recog == MAT_KPKP)
return true;
else if(mat_info->recog == MAT_KRKR)
{
return draw_krkr(board);
}
return false;
}
bool recog_draw(const board_t * board, int ThreadId) {
material_info_t mat_info[1];
ASSERT(board!=NULL);
// material
if (board->piece_nb > 4) return false;
material_get_info(mat_info,board,ThreadId);
if ((mat_info->flags & DrawNodeFlag) == 0) return false;
// recognisers
if (false) {
} else if (mat_info->recog == MAT_KK) {
// KK
return true;
} else if (mat_info->recog == MAT_KBK) {
// KBK (white)
return true;
} else if (mat_info->recog == MAT_KKB) {
// KBK (black)
return true;
} else if (mat_info->recog == MAT_KNK) {
// KNK (white)
return true;
} else if (mat_info->recog == MAT_KKN) {
// KNK (black)
return true;
} else if (mat_info->recog == MAT_KPK) {
// KPK (white)
int me, opp;
int wp, wk, bk;
me = White;
opp = COLOUR_OPP(me);
wp = board->pawn[me][0];
wk = KING_POS(board,me);
bk = KING_POS(board,opp);
if (SQUARE_FILE(wp) >= FileE) {
wp = SQUARE_FILE_MIRROR(wp);
wk = SQUARE_FILE_MIRROR(wk);
bk = SQUARE_FILE_MIRROR(bk);
}
if (kpk_draw(wp,wk,bk,board->turn)) {
return true;
}
} else if (mat_info->recog == MAT_KKP) {
// KPK (black)
int me, opp;
int wp, wk, bk;
me = Black;
opp = COLOUR_OPP(me);
wp = SQUARE_RANK_MIRROR(board->pawn[me][0]);
wk = SQUARE_RANK_MIRROR(KING_POS(board,me));
bk = SQUARE_RANK_MIRROR(KING_POS(board,opp));
if (SQUARE_FILE(wp) >= FileE) {
wp = SQUARE_FILE_MIRROR(wp);
wk = SQUARE_FILE_MIRROR(wk);
bk = SQUARE_FILE_MIRROR(bk);
}
if (kpk_draw(wp,wk,bk,COLOUR_OPP(board->turn))) {
return true;
}
} else if (mat_info->recog == MAT_KBKB) {
// KBKB
int wb, bb;
wb = board->piece[White][1];
bb = board->piece[Black][1];
if (SQUARE_COLOUR(wb) == SQUARE_COLOUR(bb)) { // bishops on same colour
return true;
}
} else if (mat_info->recog == MAT_KBPK) {
// KBPK (white)
int me, opp;
int wp, wb, bk;
me = White;
opp = COLOUR_OPP(me);
wp = board->pawn[me][0];
wb = board->piece[me][1];
bk = KING_POS(board,opp);
if (SQUARE_FILE(wp) >= FileE) {
wp = SQUARE_FILE_MIRROR(wp);
wb = SQUARE_FILE_MIRROR(wb);
bk = SQUARE_FILE_MIRROR(bk);
}
if (kbpk_draw(wp,wb,bk)) return true;
} else if (mat_info->recog == MAT_KKBP) {
// KBPK (black)
int me, opp;
int wp, wb, bk;
me = Black;
opp = COLOUR_OPP(me);
wp = SQUARE_RANK_MIRROR(board->pawn[me][0]);
wb = SQUARE_RANK_MIRROR(board->piece[me][1]);
bk = SQUARE_RANK_MIRROR(KING_POS(board,opp));
if (SQUARE_FILE(wp) >= FileE) {
wp = SQUARE_FILE_MIRROR(wp);
wb = SQUARE_FILE_MIRROR(wb);
bk = SQUARE_FILE_MIRROR(bk);
}
if (kbpk_draw(wp,wb,bk)) return true;
} else {
ASSERT(false);
}
return false;
}
