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Stockfish - material balance/imbalance evaluation
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Ralph Stoesser



Joined: 06 Mar 2010
Posts: 294
PostPost subject: Re: Stockfish - material balance/imbalance evaluation    Posted: Tue May 11, 2010 1:51 pm Reply to topic Reply with quote
mcostalba wrote:

Ralph Stoesser wrote:

C) King eval: Luckily there already is a check for x-ray queen attacks which prevents wrong mate detection. So it seems somebody already had the plan to include x-ray attacks for the queens. Who could that have been?


I fail to see the code you are referring to.

queen contact checks are currently evaluated with

Code:

      // Analyse safe queen contact checks
      b = undefended & ei.attacked_by(Them, QUEEN) & ~pos.pieces_of_color(Them);


Where the term ei.attacked_by(Them, QUEEN) would be surely influenced by queen x-ray when we will add them.


There is rather complicated code afterwards. For mate detection we should be safe because of this condition: bit_is_set(pos.attacks_from<QUEEN>(from), to)
Regarding our x-ray matter it translates to "only direct attacks from queens".
line 797.
Code:

// We have a mate, unless the queen is pinned or there
// is an X-ray attack through the queen.
for (int i = 0; i < pos.piece_count(Them, QUEEN); i++)
{
    from = pos.piece_list(Them, QUEEN, i);
    if (    bit_is_set(pos.attacks_from<QUEEN>(from), to)
        && !bit_is_set(pos.pinned_pieces(Them), from)
        && !(rook_attacks_bb(to, occ & ClearMaskBB[from]) & pos.pieces(ROOK, QUEEN, Us))
        && !(bishop_attacks_bb(to, occ & ClearMaskBB[from]) & pos.pieces(BISHOP, QUEEN, Us)))

       // Set the mate threat move
       ei.mateThreat[Them] = make_move(from, to);
}
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Subject Author Date/Time
Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 05, 2010 4:39 pm
      Re: Stockfish - material balance/imbalance evaluation Marco Costalba Wed May 05, 2010 4:48 pm
            Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 05, 2010 5:37 pm
                  Re: Stockfish - material balance/imbalance evaluation Marco Costalba Wed May 05, 2010 5:47 pm
      Re: Stockfish - material balance/imbalance evaluation Jan Brouwer Wed May 05, 2010 5:49 pm
            Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Wed May 05, 2010 7:25 pm
                  Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 05, 2010 8:02 pm
                        Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Wed May 05, 2010 10:10 pm
                              Re: Stockfish - material balance/imbalance evaluation Milos Stanisavljevic Wed May 05, 2010 10:30 pm
                                    Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Wed May 05, 2010 10:47 pm
                                    Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 05, 2010 11:27 pm
                                          Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Thu May 06, 2010 1:23 am
                                                Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Thu May 06, 2010 9:07 am
                                                      Re: Stockfish - material balance/imbalance evaluation Sven Schüle Thu May 06, 2010 9:31 am
                                                            Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Thu May 06, 2010 9:52 am
                                                                  Re: Stockfish - material balance/imbalance evaluation Sven Schüle Thu May 06, 2010 10:48 am
                                                                        Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Thu May 06, 2010 12:08 pm
                                                                              Re: Stockfish - material balance/imbalance evaluation Tord Romstad Thu May 06, 2010 8:24 pm
                                                      Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Thu May 06, 2010 1:19 pm
                                                Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Fri May 07, 2010 9:34 pm
                                                      Re: Stockfish - material balance/imbalance evaluation Marco Costalba Sat May 08, 2010 12:48 pm
                                                            Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Sat May 08, 2010 1:47 pm
                                                            Re: Stockfish - material balance/imbalance evaluation Marcel van Kervinck Sat May 08, 2010 2:01 pm
                                          Re: Stockfish - material balance/imbalance evaluation Marco Costalba Thu May 06, 2010 11:40 am
                              Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Wed May 05, 2010 10:42 pm
      Re: Stockfish - material balance/imbalance evaluation Joona Kiiski Wed May 05, 2010 7:54 pm
            Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 05, 2010 8:28 pm
            Re: Stockfish - material balance/imbalance evaluation Larry Kaufman Sun May 27, 2012 7:31 pm
      Re: Stockfish - material balance/imbalance evaluation Tord Romstad Thu May 06, 2010 8:16 pm
            Re: Stockfish - material balance/imbalance evaluation James Coit Thu May 06, 2010 10:13 pm
            Re: Stockfish - material balance/imbalance evaluation Vratko Polák Thu May 06, 2010 11:38 pm
            Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Fri May 07, 2010 12:15 am
                  Re: Stockfish - material balance/imbalance evaluation Marco Costalba Fri May 07, 2010 5:39 am
                        Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Fri May 07, 2010 8:09 am
                              Re: Stockfish - material balance/imbalance evaluation Marco Costalba Fri May 07, 2010 8:25 am
                                    Re: Stockfish - material balance/imbalance evaluation Sven Schüle Fri May 07, 2010 9:48 am
                                          Re: Stockfish - material balance/imbalance evaluation Sven Schüle Fri May 07, 2010 10:31 am
                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Fri May 07, 2010 10:54 am
                                          Re: Stockfish - material balance/imbalance evaluation Miguel A. Ballicora Fri May 07, 2010 10:31 pm
                                                Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Sat May 08, 2010 1:33 pm
                                                      Re: Stockfish - material balance/imbalance evaluation Marco Costalba Sat May 08, 2010 2:29 pm
                                                            Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Sat May 08, 2010 4:24 pm
                                                                  Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Sat May 08, 2010 7:54 pm
                                                                        Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Sun May 09, 2010 3:19 pm
                                                                              Re: Stockfish - material balance/imbalance evaluation Marco Costalba Sun May 09, 2010 4:47 pm
                                                                                    Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Sun May 09, 2010 7:51 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Marco Costalba Sun May 09, 2010 10:47 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Sun May 09, 2010 11:22 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Marco Costalba Mon May 10, 2010 4:58 am
                                                                                          Re: Stockfish - material balance/imbalance evaluation Sven Schüle Mon May 10, 2010 7:39 am
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Mon May 10, 2010 10:22 am
                                                                                          Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Mon May 10, 2010 5:04 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Mon May 10, 2010 9:35 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Marco Costalba Tue May 11, 2010 11:19 am
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Tue May 11, 2010 1:51 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Tue May 11, 2010 9:38 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Marco Costalba Wed May 12, 2010 5:05 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Robert Hyatt Wed May 12, 2010 6:14 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Marco Costalba Wed May 12, 2010 6:39 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Thu May 13, 2010 12:51 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 12, 2010 8:13 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 12, 2010 9:15 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Marco Costalba Wed May 12, 2010 9:34 pm
                                                                                          Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Wed May 12, 2010 10:02 pm
                                                            Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Sat May 08, 2010 4:53 pm
                                                                  Re: Stockfish - material balance/imbalance evaluation Ralph Stoesser Sat May 08, 2010 7:03 pm
            Re: Stockfish - material balance/imbalance evaluation Vincent Diepeveen Wed Jul 28, 2010 6:10 pm
                  Re: Stockfish - material balance/imbalance evaluation Milos Stanisavljevic Wed Jul 28, 2010 6:24 pm
                        Re: Stockfish - material balance/imbalance evaluation grzegorzs Thu Aug 05, 2010 5:36 pm
                  Re: Stockfish - material balance/imbalance evaluation Dann Corbit Wed Jul 28, 2010 6:43 pm
                        Re: Stockfish - material balance/imbalance evaluation Vincent Diepeveen Wed Jul 28, 2010 7:43 pm
                              Re: Stockfish - material balance/imbalance evaluation Vincent Diepeveen Wed Jul 28, 2010 7:44 pm
                                    Re: Stockfish - material balance/imbalance evaluation Joona Kiiski Wed Jul 28, 2010 7:55 pm
                                          Re: Stockfish - material balance/imbalance evaluation Vincent Diepeveen Wed Jul 28, 2010 8:30 pm
                                                Re: Stockfish - material balance/imbalance evaluation Milos Stanisavljevic Wed Jul 28, 2010 9:30 pm
                                                      Re: Stockfish - material balance/imbalance evaluation Vincent Diepeveen Wed Jul 28, 2010 10:11 pm
                                                            Re: Stockfish - material balance/imbalance evaluation Milos Stanisavljevic Wed Jul 28, 2010 10:31 pm
                                                                  Re: Stockfish - material balance/imbalance evaluation Vincent Diepeveen Wed Jul 28, 2010 10:57 pm
                                                            Crazy talk Ben-Hur Carlos Langoni Wed Jul 28, 2010 11:07 pm
                                                                  Re: Crazy talk Vincent Diepeveen Wed Jul 28, 2010 11:36 pm
                                                Re: Stockfish - material balance/imbalance evaluation Ben Stoker Wed Jul 28, 2010 10:07 pm
                                                      Re: Stockfish - material balance/imbalance evaluation Vincent Diepeveen Sun Aug 08, 2010 1:54 pm
                              Re: Stockfish - material balance/imbalance evaluation Robert Hyatt Wed Jul 28, 2010 8:27 pm
                                    Re: Stockfish - material balance/imbalance evaluation Dann Corbit Wed Jul 28, 2010 9:30 pm
                              Re: Stockfish - material balance/imbalance evaluation Wylie Garvin Tue Aug 10, 2010 10:00 pm
      Re: Stockfish - material balance/imbalance evaluation Tu Ngoc Trung Sun May 27, 2012 2:22 am
            Re: Stockfish - material balance/imbalance evaluation Ferdinand Mosca Sun May 27, 2012 10:01 am
                  Re: Stockfish - material balance/imbalance evaluation Tu Ngoc Trung Mon May 28, 2012 3:19 am
            Re: Stockfish - material balance/imbalance evaluation Eelco de Groot Mon May 28, 2012 4:19 am
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