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queen attacks through rooks and bishops too
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Álvaro Begué



Joined: 09 Mar 2010
Posts: 34
Location: New York
PostPost subject: Re: queen attacks through rooks and bishops too    Posted: Wed Jul 28, 2010 8:51 pm Reply to topic Reply with quote
lech wrote:
Code:

// Find attacked squares, including x-ray attacks for bishops, rooks and queen
        if (Piece == ROOK)
            b = rook_attacks_bb(s, pos.occupied_squares() & ~pos.pieces(ROOK, QUEEN, Us));
        else if (Piece == BISHOP)
            b = bishop_attacks_bb(s, pos.occupied_squares() & ~pos.pieces(QUEEN, Us));
        else if (Piece == KNIGHT)
            b = pos.attacks_from<Piece>(s);
        else if (Piece==QUEEN)
           b= queen_attacks_bb(s, pos.occupied_squares() & ~pos.pieces(ROOK, BISHOP, Us));
        else
            assert(false);


If I were to try something like this, I would make bishops "transparent" only on diagonals and rooks only on rows and columns. This seems like a good thing to try, especially when evaluating king safety.
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Subject Author Date/Time
queen attacks through rooks and bishops too Marek Kwiatkowski Wed Jul 28, 2010 3:15 pm
      Re: queen attacks through rooks and bishops too Marek Kwiatkowski Wed Jul 28, 2010 5:42 pm
            Re: queen attacks through rooks and bishops too Robert Hyatt Wed Jul 28, 2010 6:02 pm
                  Re: queen attacks through rooks and bishops too Marek Kwiatkowski Wed Jul 28, 2010 7:15 pm
                        Re: queen attacks through rooks and bishops too Ralph Stoesser Wed Jul 28, 2010 7:28 pm
                              Re: queen attacks through rooks and bishops too Marco Costalba Wed Jul 28, 2010 8:42 pm
                                    Re: queen attacks through rooks and bishops too Marek Kwiatkowski Thu Jul 29, 2010 4:57 pm
                        Re: queen attacks through rooks and bishops too Robert Hyatt Wed Jul 28, 2010 7:37 pm
      Re: queen attacks through rooks and bishops too Tord Romstad Wed Jul 28, 2010 7:55 pm
            Re: queen attacks through rooks and bishops too Ralph Stoesser Wed Jul 28, 2010 8:36 pm
                  Re: queen attacks through rooks and bishops too Robert Hyatt Wed Jul 28, 2010 8:44 pm
      Re: queen attacks through rooks and bishops too Álvaro Begué Wed Jul 28, 2010 8:51 pm
            Re: queen attacks through rooks and bishops too Marco Costalba Wed Jul 28, 2010 8:53 pm
                  Re: queen attacks through rooks and bishops too Álvaro Begué Wed Jul 28, 2010 10:07 pm
                        Re: queen attacks through rooks and bishops too Marek Kwiatkowski Thu Jul 29, 2010 12:13 pm
                              Re: queen attacks through rooks and bishops too Ralph Stoesser Thu Jul 29, 2010 4:04 pm
                        Re: queen attacks through rooks and bishops too Marco Costalba Thu Jul 29, 2010 3:54 pm
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