int GenerateWhiteCastle(const BOARD *board, MOVE *poss_moves, int nmoves)
{
if(board->wk_castle && board->squares[h1] == W_ROOK && board->squares[g1] == EMPTY
&& board->squares[f1] == EMPTY && !WhiteInCheck(board)
&& !IsAttacked(board, f1, BLACK)){
if(poss_moves) poss_moves[nmoves] = Move(0, g1, e1);
nmoves++;
}
if(board->wq_castle && board->squares[a1] == W_ROOK &&board->squares[b1] == EMPTY
&& board->squares[c1] == EMPTY && board->squares[d1] == EMPTY
&& !WhiteInCheck(board) && !IsAttacked(board, d1, BLACK)){
if(poss_moves) poss_moves[nmoves] = Move(0, c1, e1);
nmoves++;
}
return nmoves;
}
int GenerateBlackCastle(const BOARD *board, MOVE *poss_moves, int nmoves)
{
if(board->bk_castle && board->squares[h8] == B_ROOK &&board->squares[g8] == EMPTY
&& board->squares[f8] == EMPTY && !BlackInCheck(board)
&& !IsAttacked(board, f8, WHITE)){
if(poss_moves) poss_moves[nmoves] = Move(0, g8, e8);
nmoves++;
}
if(board->bq_castle && board->squares[a8] == B_ROOK &&board->squares[b8] == EMPTY
&& board->squares[c8] == EMPTY && board->squares[d8] == EMPTY
&& !BlackInCheck(board) && !IsAttacked(board, d8, WHITE)){
if(poss_moves) poss_moves[nmoves] = Move(0, c8, e8);
nmoves++;
}
return nmoves;
}
bool Position::MakeMove(Move mv)
{
Undo& undo = _undos[_undoSize++];
undo.m_castlings = m_castlings;
undo.m_ep = m_ep;
undo.m_fifty = m_fifty;
undo.m_hash = m_hash;
undo.m_mv = mv;
FLD from = mv.From();
FLD to = mv.To();
PIECE piece = mv.Piece();
PIECE captured = mv.Captured();
PIECE promotion = mv.Promotion();
COLOR side = m_side;
COLOR opp = side ^ 1;
m_hash ^= s_hashSide[1];
++m_fifty;
if (captured)
{
m_fifty = 0;
if (to == m_ep)
Remove(to + 8 - 16 * side);
else
Remove(to);
}
Remove(from);
Put(to, piece);
m_ep = NF;
switch (piece)
{
case PW:
case PB:
m_fifty = 0;
if (to - from == -16 + 32 * side)
m_ep = to + 8 - 16 * side;
else if (promotion)
{
Remove(to);
Put(to, promotion);
}
break;
case KW:
m_Kings[WHITE] = to;
if (from == E1)
{
if (to == G1)
{
Remove(H1);
Put(F1, RW);
m_castlings ^= WHITE_DID_O_O;
}
else if (to == C1)
{
Remove(A1);
Put(D1, RW);
m_castlings ^= WHITE_DID_O_O_O;
}
}
break;
case KB:
m_Kings[BLACK] = to;
if (from == E8)
{
if (to == G8)
{
Remove(H8);
Put(F8, RB);
m_castlings ^= BLACK_DID_O_O;
}
else if (to == C8)
{
Remove(A8);
Put(D8, RB);
m_castlings ^= BLACK_DID_O_O_O;
}
}
break;
default:
break;
}
static const U8 castlingDelta[64] =
{
0xf7, 0xff, 0xff, 0xff, 0xf3, 0xff, 0xff, 0xfb,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xfd, 0xff, 0xff, 0xff, 0xfc, 0xff, 0xff, 0xfe
};
m_castlings &= castlingDelta[from];
m_castlings &= castlingDelta[to];
++m_ply;
m_side ^= 1;
if (IsAttacked(m_Kings[side], opp))
{
UnmakeMove();
return false;
}
return true;
}
