-inline void Position::move_piece(Square from, Square to, Color c, PieceType pt) {
+inline void Position::remove_piece(Piece pc, Square s) {
+
+ // WARNING: This is not a reversible operation. If we remove a piece in
+ // do_move() and then replace it in undo_move() we will put it at the end of
+ // the list and not in its original place, it means index[] and pieceList[]
+ // are not invariant to a do_move() + undo_move() sequence.
+ byTypeBB[ALL_PIECES] ^= s;
+ byTypeBB[type_of(pc)] ^= s;
+ byColorBB[color_of(pc)] ^= s;
+ /* board[s] = NO_PIECE; Not needed, overwritten by the capturing one */
+ Square lastSquare = pieceList[pc][--pieceCount[pc]];
+ index[lastSquare] = index[s];
+ pieceList[pc][index[lastSquare]] = lastSquare;
+ pieceList[pc][pieceCount[pc]] = SQ_NONE;
+ pieceCount[make_piece(color_of(pc), ALL_PIECES)]--;
+}
+
+inline void Position::move_piece(Piece pc, Square from, Square to) {