// 棋子保护判断
bool PositionStruct::Protected(int sd, int sqSrc, int sqExcept) const {
// 参数"sqExcept"表示排除保护的棋子(指格子编号)，考虑被牵制子的保护时，需要排除牵制目标子的保护
int i, sqDst, sqPin, pc, x, y, nSideTag;
SlideMaskStruct *lpsmsRank, *lpsmsFile;
// 棋子保护判断包括以下几个步骤：
__ASSERT_SQUARE(sqSrc);
nSideTag = SIDE_TAG(sd);
if (HOME_HALF(sqSrc, sd)) {
if (IN_FORT(sqSrc)) {
// 1. 判断受到帅(将)的保护
sqDst = ucsqPieces[nSideTag + KING_FROM];
if (sqDst != 0 && sqDst != sqExcept) {
__ASSERT_SQUARE(sqDst);
if (KING_SPAN(sqSrc, sqDst)) {
return true;
}
}
// 2. 判断受到仕(士)的保护
for (i = ADVISOR_FROM; i <= ADVISOR_TO; i ++) {
sqDst = ucsqPieces[nSideTag + i];
if (sqDst != 0 && sqDst != sqExcept) {
__ASSERT_SQUARE(sqDst);
if (ADVISOR_SPAN(sqSrc, sqDst)) {
return true;
}
}
}
}
// 3. 判断受到相(象)的保护
for (i = BISHOP_FROM; i <= BISHOP_TO; i ++) {
sqDst = ucsqPieces[nSideTag + i];
if (sqDst != 0 && sqDst != sqExcept) {
__ASSERT_SQUARE(sqDst);
if (BISHOP_SPAN(sqSrc, sqDst) && ucpcSquares[BISHOP_PIN(sqSrc, sqDst)] == 0) {
return true;
}
}
}
} else {
// 4. 判断受到过河兵(卒)横向的保护
for (sqDst = sqSrc - 1; sqDst <= sqSrc + 1; sqDst += 2) {
// 如果棋子在边线，那么断言不成立
// __ASSERT_SQUARE(sqDst);
if (sqDst != sqExcept) {
pc = ucpcSquares[sqDst];
if ((pc & nSideTag) != 0 && PIECE_INDEX(pc) >= PAWN_FROM) {
return true;
}
}
}
}
// 5. 判断受到兵(卒)纵向的保护
sqDst = SQUARE_BACKWARD(sqSrc, sd);
// 如果棋子在底线，那么断言不成立
// __ASSERT_SQUARE(sqDst);
if (sqDst != sqExcept) {
pc = ucpcSquares[sqDst];
if ((pc & nSideTag) != 0 && PIECE_INDEX(pc) >= PAWN_FROM) {
return true;
}
}
// 6. 判断受到马的保护
for (i = KNIGHT_FROM; i <= KNIGHT_TO; i ++) {
sqDst = ucsqPieces[nSideTag + i];
if (sqDst != 0 && sqDst != sqExcept) {
__ASSERT_SQUARE(sqDst);
sqPin = KNIGHT_PIN(sqDst, sqSrc); // 注意，sqSrc和sqDst是反的！
if (sqPin != sqDst && ucpcSquares[sqPin] == 0) {
return true;
}
}
}
x = FILE_X(sqSrc);
y = RANK_Y(sqSrc);
lpsmsRank = RankMaskPtr(x, y);
lpsmsFile = FileMaskPtr(x, y);
// 7. 判断受到车的保护，参阅"position.cpp"里的"CheckedBy()"函数
for (i = ROOK_FROM; i <= ROOK_TO; i ++) {
sqDst = ucsqPieces[nSideTag + i];
if (sqDst != 0 && sqDst != sqSrc && sqDst != sqExcept) {
if (x == FILE_X(sqDst)) {
if ((lpsmsFile->wRookCap & PreGen.wBitFileMask[sqDst]) != 0) {
return true;
}
} else if (y == RANK_Y(sqDst)) {
if ((lpsmsRank->wRookCap & PreGen.wBitRankMask[sqDst]) != 0) {
return true;
}
}
}
}
// 8. 判断受到炮的保护，参阅"position.cpp"里的"CheckedBy()"函数
for (i = CANNON_FROM; i <= CANNON_TO; i ++) {
sqDst = ucsqPieces[nSideTag + i];
if (sqDst && sqDst != sqSrc && sqDst != sqExcept) {
if (x == FILE_X(sqDst)) {
if ((lpsmsFile->wCannonCap & PreGen.wBitFileMask[sqDst]) != 0) {
return true;
}
} else if (y == RANK_Y(sqDst)) {
if ((lpsmsRank->wCannonCap & PreGen.wBitRankMask[sqDst]) != 0) {
return true;
}
}
}
}
return false;
}
BOOL _PositionStruct::LegalMove(int mv) const {
int sqSrc, sqDst, sqPin;
int pcSelfSide, pcSrc, pcDst, nDelta;
sqSrc = SRC(mv);
pcSrc = ucpcSquares[sqSrc];
pcSelfSide = SIDE_TAG(sdPlayer);
if ((pcSrc & pcSelfSide) == 0) {
return FALSE;
}
sqDst = DST(mv);
pcDst = ucpcSquares[sqDst];
if ((pcDst & pcSelfSide) != 0) {
return FALSE;
}
switch (pcSrc - pcSelfSide) {
case PIECE_KING:
return IN_FORT(sqDst) && KING_SPAN(sqSrc, sqDst);
case PIECE_ADVISOR:
return IN_FORT(sqDst) && ADVISOR_SPAN(sqSrc, sqDst);
case PIECE_BISHOP:
return SAME_HALF(sqSrc, sqDst) && BISHOP_SPAN(sqSrc, sqDst) &&
ucpcSquares[BISHOP_PIN(sqSrc, sqDst)] == 0;
case PIECE_KNIGHT:
sqPin = KNIGHT_PIN(sqSrc, sqDst);
return sqPin != sqSrc && ucpcSquares[sqPin] == 0;
case PIECE_ROOK:
case PIECE_CANNON:
if (SAME_RANK(sqSrc, sqDst)) {
nDelta = (sqDst < sqSrc ? -1 : 1);
} else if (SAME_FILE(sqSrc, sqDst)) {
nDelta = (sqDst < sqSrc ? -16 : 16);
} else {
return FALSE;
}
sqPin = sqSrc + nDelta;
while (sqPin != sqDst && ucpcSquares[sqPin] == 0) {
sqPin += nDelta;
}
if (sqPin == sqDst) {
return pcDst == 0 || pcSrc - pcSelfSide == PIECE_ROOK;
} else if (pcDst != 0 && pcSrc - pcSelfSide == PIECE_CANNON) {
sqPin += nDelta;
while (sqPin != sqDst && ucpcSquares[sqPin] == 0) {
sqPin += nDelta;
}
return sqPin == sqDst;
} else {
return FALSE;
}
case PIECE_PAWN:
if (AWAY_HALF(sqDst, sdPlayer) && (sqDst == sqSrc - 1 || sqDst == sqSrc + 1)) {
return TRUE;
}
return sqDst == SQUARE_FORWARD(sqSrc, sdPlayer);
default:
return FALSE;
}
}
void PreGenInit(void) {
int i, j, k, n, sqSrc, sqDst;
RC4Struct rc4;
SlideMoveStruct smv;
SlideMaskStruct sms;
// 首先初始化Zobrist键值表
rc4.InitZero();
PreGen.zobrPlayer.InitRC4(rc4);
for (i = 0; i < 14; i ++) {
for (j = 0; j < 256; j ++) {
PreGen.zobrTable[i][j].InitRC4(rc4);
}
}
// 然后初始化屏蔽位行和屏蔽位列
// 注：位行和位列不包括棋盘以外的位，所以就会频繁使用"+/- RANK_TOP/FILE_LEFT"
for (sqSrc = 0; sqSrc < 256; sqSrc ++) {
if (IN_BOARD(sqSrc)) {
PreGen.wBitRankMask[sqSrc] = 1 << (FILE_X(sqSrc) - FILE_LEFT);
PreGen.wBitFileMask[sqSrc] = 1 << (RANK_Y(sqSrc) - RANK_TOP);
} else {
PreGen.wBitRankMask[sqSrc] = 0;
PreGen.wBitFileMask[sqSrc] = 0;
}
}
// 然后生成车炮横向的预置数组(数组的应用参阅"pregen.h")
for (i = 0; i < 9; i ++) {
for (j = 0; j < 512; j ++) {
// 初始化借助于“位行”的车和炮的着法预生成数组，包括以下几个步骤：
// 1. 初始化临时变量"SlideMoveTab"，假设没有着法，用起始格填充
smv.ucNonCap[0] = smv.ucNonCap[1] = smv.ucRookCap[0] = smv.ucRookCap[1] =
smv.ucCannonCap[0] = smv.ucCannonCap[1] = smv.ucSuperCap[0] = smv.ucSuperCap[1] = i + FILE_LEFT;
sms.wNonCap = sms.wRookCap = sms.wCannonCap = sms.wSuperCap = 0;
// 提示：参阅"pregen.h"，...[0]表示最大一格，向右移动和下移动都用[0]，反之亦然
// 2. 考虑向右移动的目标格，填充...[0]，
for (k = i + 1; k <= 8; k ++) {
if ((j & (1 << k)) != 0) {
smv.ucRookCap[0] = FILE_DISP(k + FILE_LEFT);
sms.wRookCap |= 1 << k;
break;
}
smv.ucNonCap[0] = FILE_DISP(k + FILE_LEFT);
sms.wNonCap |= 1 << k;
}
for (k ++; k <= 8; k ++) {
if ((j & (1 << k)) != 0) {
smv.ucCannonCap[0] = FILE_DISP(k + FILE_LEFT);
sms.wCannonCap |= 1 << k;
break;
}
}
for (k ++; k <= 8; k ++) {
if ((j & (1 << k)) != 0) {
smv.ucSuperCap[0] = FILE_DISP(k + FILE_LEFT);
sms.wSuperCap |= 1 << k;
break;
}
}
// 3. 考虑向左移动的目标格，填充...[1]
for (k = i - 1; k >= 0; k --) {
if ((j & (1 << k)) != 0) {
smv.ucRookCap[1] = FILE_DISP(k + FILE_LEFT);
sms.wRookCap |= 1 << k;
break;
}
smv.ucNonCap[1] = FILE_DISP(k + FILE_LEFT);
sms.wNonCap |= 1 << k;
}
for (k --; k >= 0; k --) {
if ((j & (1 << k)) != 0) {
smv.ucCannonCap[1] = FILE_DISP(k + FILE_LEFT);
sms.wCannonCap |= 1 << k;
break;
}
}
for (k --; k >= 0; k --) {
if ((j & (1 << k)) != 0) {
smv.ucSuperCap[1] = FILE_DISP(k + FILE_LEFT);
sms.wSuperCap |= 1 << k;
break;
}
}
// 4. 为"smv"和"sms"的值作断言
__ASSERT_BOUND_2(3, smv.ucNonCap[1], smv.ucNonCap[0], 11);
__ASSERT_BOUND_2(3, smv.ucRookCap[1], smv.ucRookCap[0], 11);
__ASSERT_BOUND_2(3, smv.ucCannonCap[1], smv.ucCannonCap[0], 11);
__ASSERT_BOUND_2(3, smv.ucSuperCap[1], smv.ucSuperCap[0], 11);
__ASSERT_BITRANK(sms.wNonCap);
__ASSERT_BITRANK(sms.wRookCap);
__ASSERT_BITRANK(sms.wCannonCap);
__ASSERT_BITRANK(sms.wSuperCap);
// 5. 将临时变量"smv"和"sms"拷贝到着法预生成数组中
PreGen.smvRankMoveTab[i][j] = smv;
PreGen.smsRankMaskTab[i][j] = sms;
}
}
// 然后生成车炮纵向的预置数组(数组的应用参阅"pregen.h")
for (i = 0; i < 10; i ++) {
for (j = 0; j < 1024; j ++) {
// 初始化借助于“位列”的车和炮的着法预生成数组，包括以下几个步骤：
// 1. 初始化临时变量"smv"，假设没有着法，用起始格填充
smv.ucNonCap[0] = smv.ucNonCap[1] = smv.ucRookCap[0] = smv.ucRookCap[1] =
smv.ucCannonCap[0] = smv.ucCannonCap[1] = smv.ucSuperCap[0] = smv.ucSuperCap[1] = (i + RANK_TOP) * 16;
sms.wNonCap = sms.wRookCap = sms.wCannonCap = sms.wSuperCap = 0;
// 2. 考虑向下移动的目标格，填充...[0]
for (k = i + 1; k <= 9; k ++) {
if ((j & (1 << k)) != 0) {
smv.ucRookCap[0] = RANK_DISP(k + RANK_TOP);
sms.wRookCap |= 1 << k;
break;
}
smv.ucNonCap[0] = RANK_DISP(k + RANK_TOP);
sms.wNonCap |= 1 << k;
}
for (k ++; k <= 9; k ++) {
if ((j & (1 << k)) != 0) {
smv.ucCannonCap[0] = RANK_DISP(k + RANK_TOP);
sms.wCannonCap |= 1 << k;
break;
}
}
for (k ++; k <= 9; k ++) {
if ((j & (1 << k)) != 0) {
smv.ucSuperCap[0] = RANK_DISP(k + RANK_TOP);
sms.wSuperCap |= 1 << k;
break;
}
}
// 3. 考虑向上移动的目标格，填充...[1]
for (k = i - 1; k >= 0; k --) {
if ((j & (1 << k)) != 0) {
smv.ucRookCap[1] = RANK_DISP(k + RANK_TOP);
sms.wRookCap |= 1 << k;
break;
}
smv.ucNonCap[1] = RANK_DISP(k + RANK_TOP);
sms.wNonCap |= 1 << k;
}
for (k --; k >= 0; k --) {
if ((j & (1 << k)) != 0) {
smv.ucCannonCap[1] = RANK_DISP(k + RANK_TOP);
sms.wCannonCap |= 1 << k;
break;
}
}
for (k --; k >= 0; k --) {
if ((j & (1 << k)) != 0) {
smv.ucSuperCap[1] = RANK_DISP(k + RANK_TOP);
sms.wSuperCap |= 1 << k;
break;
}
}
// 4. 为"smv"和"sms"的值作断言
__ASSERT_BOUND_2(3, smv.ucNonCap[1] >> 4, smv.ucNonCap[0] >> 4, 12);
__ASSERT_BOUND_2(3, smv.ucRookCap[1] >> 4, smv.ucRookCap[0] >> 4, 12);
__ASSERT_BOUND_2(3, smv.ucCannonCap[1] >> 4, smv.ucCannonCap[0] >> 4, 12);
__ASSERT_BOUND_2(3, smv.ucSuperCap[1] >> 4, smv.ucSuperCap[0] >> 4, 12);
__ASSERT_BITFILE(sms.wNonCap);
__ASSERT_BITFILE(sms.wRookCap);
__ASSERT_BITFILE(sms.wCannonCap);
__ASSERT_BITFILE(sms.wSuperCap);
// 5. 将临时变量"smv"和"sms"拷贝到着法预生成数组中
PreGen.smvFileMoveTab[i][j] = smv;
PreGen.smsFileMaskTab[i][j] = sms;
}
}
// 接下来生成着法预生成数组，连同将军预判数组
for (sqSrc = 0; sqSrc < 256; sqSrc ++) {
if (IN_BOARD(sqSrc)) {
// 生成帅(将)的着法预生成数组
n = 0;
for (i = 0; i < 4; i ++) {
sqDst = sqSrc + cnKingMoveTab[i];
if (IN_FORT(sqDst)) {
PreGen.ucsqKingMoves[sqSrc][n] = sqDst;
n ++;
}
}
__ASSERT(n <= 4);
PreGen.ucsqKingMoves[sqSrc][n] = 0;
// 生成仕(士)的着法预生成数组
n = 0;
for (i = 0; i < 4; i ++) {
sqDst = sqSrc + cnAdvisorMoveTab[i];
if (IN_FORT(sqDst)) {
PreGen.ucsqAdvisorMoves[sqSrc][n] = sqDst;
n ++;
}
}
__ASSERT(n <= 4);
PreGen.ucsqAdvisorMoves[sqSrc][n] = 0;
// 生成相(象)的着法预生成数组，包括象眼数组
n = 0;
for (i = 0; i < 4; i ++) {
sqDst = sqSrc + cnBishopMoveTab[i];
if (IN_BOARD(sqDst) && SAME_HALF(sqSrc, sqDst)) {
PreGen.ucsqBishopMoves[sqSrc][n] = sqDst;
PreGen.ucsqBishopPins[sqSrc][n] = BISHOP_PIN(sqSrc, sqDst);
n ++;
}
}
__ASSERT(n <= 4);
PreGen.ucsqBishopMoves[sqSrc][n] = 0;
// 生成马的着法预生成数组，包括马腿数组
n = 0;
for (i = 0; i < 8; i ++) {
sqDst = sqSrc + cnKnightMoveTab[i];
if (IN_BOARD(sqDst)) {
PreGen.ucsqKnightMoves[sqSrc][n] = sqDst;
PreGen.ucsqKnightPins[sqSrc][n] = KNIGHT_PIN(sqSrc, sqDst);
n ++;
}
}
__ASSERT(n <= 8);
PreGen.ucsqKnightMoves[sqSrc][n] = 0;
// 生成兵(卒)的着法预生成数组
for (i = 0; i < 2; i ++) {
n = 0;
sqDst = SQUARE_FORWARD(sqSrc, i);
sqDst = sqSrc + (i == 0 ? -16 : 16);
if (IN_BOARD(sqDst)) {
PreGen.ucsqPawnMoves[i][sqSrc][n] = sqDst;
n ++;
}
if (AWAY_HALF(sqSrc, i)) {
for (j = -1; j <= 1; j += 2) {
sqDst = sqSrc + j;
if (IN_BOARD(sqDst)) {
PreGen.ucsqPawnMoves[i][sqSrc][n] = sqDst;
n ++;
}
}
}
__ASSERT(n <= 3);
PreGen.ucsqPawnMoves[i][sqSrc][n] = 0;
}
}
}
// 最后清空局面预评价结构
memset(&PreEval, 0, sizeof(PreEvalStruct));
PreEval.bPromotion = false; // 缺省是不允许升变的
}