case BISHOP:
return (dcCandidates && bit_is_set(dcCandidates, from))
- || ( direction_between_squares(ksq, to) != DIR_NONE
- && bit_is_set(piece_attacks<BISHOP>(ksq), to));
+ || (direction_is_diagonal(ksq, to) && bit_is_set(piece_attacks<BISHOP>(ksq), to));
case ROOK:
return (dcCandidates && bit_is_set(dcCandidates, from))
- || ( direction_between_squares(ksq, to) != DIR_NONE
- && bit_is_set(piece_attacks<ROOK>(ksq), to));
+ || (direction_is_straight(ksq, to) && bit_is_set(piece_attacks<ROOK>(ksq), to));
case QUEEN:
// Discovered checks are impossible!
assert(!bit_is_set(dcCandidates, from));
- return ( direction_between_squares(ksq, to) != DIR_NONE
- && bit_is_set(piece_attacks<QUEEN>(ksq), to));
+ return ( (direction_is_straight(ksq, to) && bit_is_set(piece_attacks<ROOK>(ksq), to))
+ || (direction_is_diagonal(ksq, to) && bit_is_set(piece_attacks<BISHOP>(ksq), to)));
case KING:
// Discovered check?
}
-/// Position::move_is_capture() tests whether a move from the current
-/// position is a capture. Move must not be MOVE_NONE.
-
-bool Position::move_is_capture(Move m) const {
-
- assert(m != MOVE_NONE);
-
- return ( !square_is_empty(move_to(m))
- && (color_of_piece_on(move_to(m)) != color_of_piece_on(move_from(m)))
- )
- || move_is_ep(m);
-}
-
-
/// Position::update_checkers() udpates chekers info given the move. It is called
/// in do_move() and is faster then find_checkers().