forked from sent/waves
186 lines
3.3 KiB
JavaScript
186 lines
3.3 KiB
JavaScript
var PawnTable = [
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0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 ,
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10 , 10 , 0 , -10 , -10 , 0 , 10 , 10 ,
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5 , 0 , 0 , 5 , 5 , 0 , 0 , 5 ,
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0 , 0 , 10 , 20 , 20 , 10 , 0 , 0 ,
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5 , 5 , 5 , 10 , 10 , 5 , 5 , 5 ,
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10 , 10 , 10 , 20 , 20 , 10 , 10 , 10 ,
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20 , 20 , 20 , 30 , 30 , 20 , 20 , 20 ,
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0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
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];
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var KnightTable = [
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0 , -10 , 0 , 0 , 0 , 0 , -10 , 0 ,
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0 , 0 , 0 , 5 , 5 , 0 , 0 , 0 ,
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0 , 0 , 10 , 10 , 10 , 10 , 0 , 0 ,
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0 , 0 , 10 , 20 , 20 , 10 , 5 , 0 ,
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5 , 10 , 15 , 20 , 20 , 15 , 10 , 5 ,
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5 , 10 , 10 , 20 , 20 , 10 , 10 , 5 ,
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0 ,
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0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
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];
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var BishopTable = [
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0 , 0 , -10 , 0 , 0 , -10 , 0 , 0 ,
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0 , 0 , 0 , 10 , 10 , 0 , 0 , 0 ,
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0 , 0 , 10 , 15 , 15 , 10 , 0 , 0 ,
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0 , 10 , 15 , 20 , 20 , 15 , 10 , 0 ,
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0 , 10 , 15 , 20 , 20 , 15 , 10 , 0 ,
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0 , 0 , 10 , 15 , 15 , 10 , 0 , 0 ,
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0 , 0 , 0 , 10 , 10 , 0 , 0 , 0 ,
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0 , 0 , 0 , 0 , 0 , 0 , 0 , 0
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];
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var RookTable = [
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0 ,
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0 ,
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0 ,
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0 ,
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0 ,
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0 ,
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25 , 25 , 25 , 25 , 25 , 25 , 25 , 25 ,
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0 , 0 , 5 , 10 , 10 , 5 , 0 , 0
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];
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var BishopPair = 40;
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function EvalPosition() {
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var score = GameBoard.material[COLOURS.WHITE] - GameBoard.material[COLOURS.BLACK];
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var pce;
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var sq;
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var pceNum;
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pce = PIECES.wP;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score += PawnTable[SQ64(sq)];
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}
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pce = PIECES.bP;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score -= PawnTable[MIRROR64(SQ64(sq))];
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}
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pce = PIECES.wN;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score += KnightTable[SQ64(sq)];
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}
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pce = PIECES.bN;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score -= KnightTable[MIRROR64(SQ64(sq))];
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}
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pce = PIECES.wB;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score += BishopTable[SQ64(sq)];
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}
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pce = PIECES.bB;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score -= BishopTable[MIRROR64(SQ64(sq))];
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}
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pce = PIECES.wR;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score += RookTable[SQ64(sq)];
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}
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pce = PIECES.bR;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score -= RookTable[MIRROR64(SQ64(sq))];
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}
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pce = PIECES.wQ;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score += RookTable[SQ64(sq)];
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}
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pce = PIECES.bQ;
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for(pceNum = 0; pceNum < GameBoard.pceNum[pce]; ++pceNum) {
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sq = GameBoard.pList[PCEINDEX(pce,pceNum)];
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score -= RookTable[MIRROR64(SQ64(sq))];
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}
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if(GameBoard.pceNum[PIECES.wB] >= 2) {
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score += BishopPair;
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}
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if(GameBoard.pceNum[PIECES.bB] >= 2) {
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score -= BishopPair;
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}
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if(GameBoard.side == COLOURS.WHITE) {
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return score;
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} else {
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return -score;
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}
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}
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