void move_do(board_t * board, int move) {
int me, opp;
int from, to;
int piece, pos, capture;
int old_flags, new_flags;
int sq, ep_square;
int pawn;
ASSERT(board_is_ok(board));
ASSERT(move_is_ok(move));
ASSERT(move_is_pseudo(move,board));
// init
me = board->turn;
opp = colour_opp(me);
from = move_from(move);
to = move_to(move);
piece = board->square[from];
ASSERT(colour_equal(piece,me));
pos = board->pos[from];
ASSERT(pos>=0);
// update turn
board->turn = opp;
board->key ^= random_64(RandomTurn);
// update castling rights
old_flags = board_flags(board);
if (piece_is_king(piece)) {
board->castle[me][SideH] = SquareNone;
board->castle[me][SideA] = SquareNone;
}
if (board->castle[me][SideH] == from) board->castle[me][SideH] = SquareNone;
if (board->castle[me][SideA] == from) board->castle[me][SideA] = SquareNone;
if (board->castle[opp][SideH] == to) board->castle[opp][SideH] = SquareNone;
if (board->castle[opp][SideA] == to) board->castle[opp][SideA] = SquareNone;
new_flags = board_flags(board);
board->key ^= hash_castle_key(new_flags^old_flags); // HACK
// update en-passant square
ep_square = sq = board->ep_square;
if (sq != SquareNone) {
board->key ^= random_64(RandomEnPassant+square_file(sq));
board->ep_square = SquareNone;
}
if (piece_is_pawn(piece) && abs(to-from) == 32) {
pawn = piece_make_pawn(opp);
if (board->square[to-1] == pawn || board->square[to+1] == pawn) {
board->ep_square = sq = (from + to) / 2;
board->key ^= random_64(RandomEnPassant+square_file(sq));
}
}
// update ply number (captures are handled later)
board->ply_nb++;
if (piece_is_pawn(piece)) board->ply_nb = 0; // conversion
// update move number
if (me == Black) board->move_nb++;
// castle
if (colour_equal(board->square[to],me)) {
int rank;
int king_from, king_to;
int rook_from, rook_to;
int rook;
rank = colour_is_white(me) ? Rank1 : Rank8;
king_from = from;
rook_from = to;
if (to > from) { // h side
king_to = square_make(FileG,rank);
rook_to = square_make(FileF,rank);
} else { // a side
king_to = square_make(FileC,rank);
rook_to = square_make(FileD,rank);
}
// remove the rook
pos = board->pos[rook_from];
ASSERT(pos>=0);
rook = Rook64 | me; // HACK
square_clear(board,rook_from,rook);
// move the king
square_move(board,king_from,king_to,piece);
// put the rook back
square_set(board,rook_to,rook,pos);
ASSERT(board->key==hash_key(board));
return;
}
// remove the captured piece
if (piece_is_pawn(piece) && to == ep_square) {
// en-passant capture
sq = square_ep_dual(to);
capture = board->square[sq];
ASSERT(capture==piece_make_pawn(opp));
square_clear(board,sq,capture);
board->ply_nb = 0; // conversion
} else {
capture = board->square[to];
if (capture != Empty) {
// normal capture
ASSERT(colour_equal(capture,opp));
ASSERT(!piece_is_king(capture));
square_clear(board,to,capture);
board->ply_nb = 0; // conversion
}
}
// move the piece
if (move_is_promote(move)) {
// promote
square_clear(board,from,piece);
piece = move_promote_hack(move) | me; // HACK
square_set(board,to,piece,pos);
} else {
// normal move
square_move(board,from,to,piece);
}
ASSERT(board->key==hash_key(board));
}
bool move_to_san(int move, const board_t * board, char string[], int size) {
int from, to, piece;
char tmp_string[256];
ASSERT(move_is_ok(move));
ASSERT(board_is_ok(board));
ASSERT(string!=NULL);
ASSERT(size>=8);
ASSERT(move_is_legal(move,board));
if (size < 8) return false;
// init
from = move_from(move);
to = move_to(move);
string[0] = '\0';
// castle
if (move_is_castle(move,board)) {
if (to > from) {
strcat(string,"O-O");
} else {
strcat(string,"O-O-O");
}
goto check;
}
// from
piece = board->square[from];
if (piece_is_pawn(piece)) {
// pawn
if (move_is_capture(move,board)) {
sprintf(tmp_string,"%c",file_to_char(square_file(from)));
strcat(string,tmp_string);
}
} else {
// piece
sprintf(tmp_string,"%c",toupper(piece_to_char(piece)));
strcat(string,tmp_string);
// ambiguity
switch (ambiguity(move,board)) {
case AMBIGUITY_NONE:
break;
case AMBIGUITY_FILE:
sprintf(tmp_string,"%c",file_to_char(square_file(from)));
strcat(string,tmp_string);
break;
case AMBIGUITY_RANK:
sprintf(tmp_string,"%c",rank_to_char(square_rank(from)));
strcat(string,tmp_string);
break;
case AMBIGUITY_SQUARE:
if (!square_to_string(from,tmp_string,256)) return false;
strcat(string,tmp_string);
break;
default:
ASSERT(false);
break;
}
}
// capture
if (move_is_capture(move,board)) strcat(string,"x");
// to
if (!square_to_string(to,tmp_string,256)) return false;
strcat(string,tmp_string);
// promote
if (move_is_promote(move)) {
sprintf(tmp_string,"=%c",toupper(piece_to_char(move_promote(move,board))));
strcat(string,tmp_string);
}
// check
check:
if (move_is_mate(move,board)) {
strcat(string,"#");
} else if (move_is_check(move,board)) {
strcat(string,"+");
}
return true;
}