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Populated the value of piece_bb[NO_PIECE] #14

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Populated the value of piece_bb[NO_PIECE] #14

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5 changes: 4 additions & 1 deletion src/position.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,7 @@ void Position::move_piece(Square from, Square to) {
hash ^= zobrist::zobrist_table[board[from]][from] ^ zobrist::zobrist_table[board[from]][to]
^ zobrist::zobrist_table[board[to]][to];
Bitboard mask = SQUARE_BB[from] | SQUARE_BB[to];
piece_bb[NO_PIECE] = SQUARE_BB[from] | piece_bb[NO_PIECE]& ~SQUARE_BB[to];
piece_bb[board[from]] ^= mask;
piece_bb[board[to]] &= ~mask;
board[to] = board[from];
Expand All @@ -118,7 +119,9 @@ void Position::move_piece(Square from, Square to) {
//Moves a piece to an empty square. Note that it is an error if the <to> square contains a piece
void Position::move_piece_quiet(Square from, Square to) {
hash ^= zobrist::zobrist_table[board[from]][from] ^ zobrist::zobrist_table[board[from]][to];
piece_bb[board[from]] ^= (SQUARE_BB[from] | SQUARE_BB[to]);
Bitboard mask = SQUARE_BB[from] | SQUARE_BB[to];
piece_bb[board[from]] ^= mask;
piece_bb[NO_PIECE] ^= mask;
board[to] = board[from];
board[from] = NO_PIECE;
}
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5 changes: 4 additions & 1 deletion src/position.h
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Original file line number Diff line number Diff line change
Expand Up @@ -89,6 +89,7 @@ class Position {
hash(0), pinned(0), checkers(0) {

//Sets all squares on the board as empty
piece_bb[NO_PIECE] =~piece_bb[NO_PIECE];
for (int i = 0; i < 64; i++) board[i] = NO_PIECE;
history[0] = UndoInfo();
}
Expand All @@ -98,13 +99,15 @@ class Position {
inline void put_piece(Piece pc, Square s) {
board[s] = pc;
piece_bb[pc] |= SQUARE_BB[s];
piece_bb[NO_PIECE] &= ~SQUARE_BB[s];
hash ^= zobrist::zobrist_table[pc][s];
}

//Removes a piece from a particular square and updates the hash.
inline void remove_piece(Square s) {
hash ^= zobrist::zobrist_table[board[s]][s];
piece_bb[board[s]] &= ~SQUARE_BB[s];
piece_bb[NO_PIECE] |= SQUARE_BB[s];
board[s] = NO_PIECE;
}

Expand Down Expand Up @@ -369,7 +372,7 @@ Move* Position::generate_legals(Move* list) {

const Bitboard us_bb = all_pieces<Us>();
const Bitboard them_bb = all_pieces<Them>();
const Bitboard all = us_bb | them_bb;
const Bitboard all = ~piece_bb[NO_PIECE];

const Square our_king = bsf(bitboard_of(Us, KING));
const Square their_king = bsf(bitboard_of(Them, KING));
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