Author: George Tsavdaris
Date: 02:17:59 03/03/04
Go up one level in this thread
On March 03, 2004 at 04:18:30, Paul Byrne wrote: >Granted, it is not a terribly useful position, as it came from a wild 8 (pawns >start on 4th rank) game on ICC between 2 patzers. And a very short search will >get you a score of +10 to +15 and better in white's favor. > >It is, however, surprisingly tough to see the mate, and makes an interesting >test position... > >[D]r1b3n1/6k1/1n6/pP3qPQ/2PP2p1/1p4b1/4B3/R1BK2NR w - - 0 15 > >Guildenstern's normal search cannot see it here, while it's PN search gets it in >under 30 seconds on an athlon 2400+. The line the PN search produces is mate in >19, but is likely not optimal, as PN search is not terribly concerned with >winning in the least number of moves. > >So, what programs can see the win from here? > The best in this positions Chessmaster and specifically CM9000-SKR find this in 24 seconds! in a PIV-1500 MHz with 32 MiB hash. And announces a mate in 16! Time Depth Score Positions Moves 0:00 1/3 12.23 1805 15.Qh5-h8+ Kg7-f7 16.Rh1-h7+ Qf5xh7 17.Qh8xh7+ Kf7-e8 18.Qh7xg8+ Ke8-e7 19.Qg8-g6 0:00 1/4 12.38 5394 15.Qh5-h8+ Kg7-f8 16.Bc1-a3+ Bg3-d6 17.Ba3xd6+ Kf8-e8 18.Qh8xg8+ Ke8-d7 19.Rh1-h7+ Qf5xh7 20.Qg8xh7+ Kd7xd6 0:00 1/5 14.07 15919 15.Qh5-h8+ Kg7-f8 16.Bc1-a3+ Bg3-d6 17.Ba3xd6+ Kf8-e8 18.Qh8xg8+ Ke8-d7 19.Rh1-h7+ Qf5xh7 20.Qg8xh7+ Kd7xd6 21.c4-c5+ Kd6-d5 22.c5xb6 Kd5xd4 0:00 1/6 14.06 48030 15.Qh5-h8+ Kg7-f8 16.Bc1-a3+ Bg3-d6 17.Ba3xd6+ Kf8-e8 18.Qh8xg8+ Ke8-d7 19.Rh1-h7+ Qf5xh7 20.Qg8xh7+ Kd7xd6 21.c4-c5+ Kd6-d5 22.c5xb6 a5-a4 0:01 1/7 15.09 167717 15.Qh5-h8+ Kg7-f8 16.Bc1-a3+ Bg3-d6 17.Ba3xd6+ Kf8-e8 18.Qh8xg8+ Ke8-d7 19.Rh1-h7+ Qf5xh7 20.Qg8xh7+ Kd7xd6 21.c4-c5+ Kd6-d5 22.Qh7-h8 Nb6-c4 23.Qh8-d8+ Kd5-e4 24.Be2xc4 0:07 1/8 15.48 1006062 15.Qh5-h8+ Kg7-f7 16.Rh1-h7+ Qf5xh7 17.Qh8xh7+ Kf7-e8 18.Qh7xg8+ Ke8-d7 19.Qg8-g7+ Kd7-d8 20.Qg7-f6+ Kd8-c7 21.Qf6-c6+ Kc7-b8 22.Qc6xb6+ Bc8-b7 23.Qb6-d8+ Bb7-c8 24.Be2xg4 0:08 1/9 19.56 1217729 15.Qh5-h8+ Kg7-f7 16.Rh1-h7+ Qf5xh7 17.Qh8xh7+ Kf7-e8 18.Qh7xg8+ Ke8-d7 19.Qg8-g7+ Kd7-d8 20.Qg7-f6+ Kd8-c7 21.Qf6-c6+ Kc7-d8 22.Qc6xb6+ Kd8-e8 23.Qb6-c6+ Ke8-f7 24.Qc6xa8 0:12 1/10 19.96 1712672 15.Qh5-h8+ Kg7-f7 16.Rh1-h7+ Qf5xh7 17.Qh8xh7+ Kf7-e8 18.Qh7xg8+ Ke8-d7 19.Qg8-g7+ Kd7-d8 20.Qg7-f6+ Kd8-c7 21.Qf6-c6+ Kc7-d8 22.g5-g6 Bg3-h4 23.Qc6xb6+ Kd8-e8 24.Qb6-c6+ Ke8-d8 25.Qc6xa8 0:24 1/11 Mate16 3618230 15.Qh5-h8+ Kg7-f7 16.Rh1-h7+ Qf5xh7 17.Qh8xh7+ Kf7-e8 18.Qh7xg8+ Ke8-d7 19.Qg8-g7+ Kd7-d8 20.Qg7-f6+ Kd8-c7 21.Qf6-c6+ Kc7-d8 22.g5-g6 Ra8-a7 23.Bc1-g5+ Ra7-e7 24.g6-g7 Bc8-e6 25.Qc6xe6 Kd8-c7 26.Qe6-c6+ Kc7-b8 27.g7-g8=Q+ Re7-e8 28.Qg8xe8+ Nb6-c8 29.Qe8xc8+ Kb8-a7 30.Ra1xa5# 0:48 1/12 Mate16 7946164 15.Qh5-h8+ Kg7-f7 16.Rh1-h7+ Qf5xh7 17.Qh8xh7+ Kf7-e8 18.Qh7xg8+ Ke8-d7 19.Qg8-g7+ Kd7-d8 20.Qg7-f6+ Kd8-c7 21.Qf6-c6+ Kc7-d8 22.g5-g6 Nb6-d5 23.Bc1-g5+ Nd5-e7 24.g6-g7 Bc8-e6 25.Qc6xe6 Bg3-d6 26.Qe6xd6+ Kd8-c8 27.g7-g8=Q+ Ne7xg8 28.Qd6-c6+ Kc8-b8 29.Qc6-b6+ Kb8-c8 30.Be2xg4#
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