Author: John Merlino
Date: 11:55:27 04/03/05
Go up one level in this thread
On April 02, 2005 at 19:49:15, Rob Basham wrote: >[D]rr2q1k1/2pb2p1/3p1pP1/ppnPp3/2P1P1P1/7R/PP4BP/4QRK1 w - - 0 1 > >Mate in about 20....? > >1 Rh8+....! > >Some programs find this, even though it does not seem to be a forced mate... > >rob CMX Yoda v25 finds Rh8+ in two seconds on a P4-2.4: Time Depth Score Positions Moves 0:00 1/4 -4.12 10512 1.cxb5 Bxg4 2.Rg3 Qxg6 0:00 1/4 -2.94 20821 1.Rh8+ Kxh8 2.Qh4+ Kg8 3.Qh7+ Kf8 4.Rxf6+ gxf6 5.g7+ Ke7 6.g8=Q+ Kd8 7.Qxe8+ Bxe8 0:00 1/4 -2.48 21770 1.Rxf6 gxf6 2.Qh4 Qxg6 3.Qh8+ Kf7 4.Rh7+ Qxh7 5.Qxh7+ Kf8 0:00 1/5 -2.52 23579 1.Rxf6 gxf6 2.Qh4 Qxg6 3.Qh8+ Kf7 4.Rh7+ Qxh7 5.Qxh7+ Kf8 6.cxb5 Rxb5 0:00 1/6 -1.49 45633 1.Rxf6 gxf6 2.Qh4 Qxg6 3.Qh8+ Kf7 4.Rh7+ Qxh7 5.Qxh7+ Kf8 6.Qh8+ Ke7 7.Qg7+ Kd8 8.Qxf6+ Kc8 0:00 1/7 -1.49 86649 1.Rxf6 gxf6 2.Qh4 Qxg6 3.Qh8+ Kf7 4.Rh7+ Qxh7 5.Qxh7+ Kf8 6.Qh8+ Ke7 7.Qg7+ Kd8 8.Qxf6+ Kc8 0:01 1/8 -1.58 193560 1.Rxf6 gxf6 2.Qh4 Qxg6 3.Qh8+ Kf7 4.Rh7+ Qxh7 5.Qxh7+ Kf8 6.Qh8+ Ke7 7.Qg7+ Kd8 8.Qh8+ Be8 9.Qxf6+ Kc8 0:02 1/8 0.25 498847 1.Rh8+ Kxh8 2.Qh4+ Kg8 3.Qh7+ Kf8 4.g5 Nxe4 5.Bxe4 Bf5 6.Qh8+ Ke7 7.Qxg7+ Kd8 8.Qxf6+ Qe7 9.Bxf5 bxc4 0:03 1/9 1.62 828719 1.Rh8+ Kxh8 2.Qh4+ Kg8 3.Qh7+ Kf8 4.g5 Nxe4 5.Bxe4 f5 6.Bxf5 Be6 7.Bxe6+ Ke7 8.Qxg7+ Kd8 9.Qf6+ Qe7 0:06 1/10 2.14 1554118 1.Rh8+ Kxh8 2.Qh4+ Kg8 3.Qh7+ Kf8 4.g5 Nxe4 5.Bxe4 f5 6.Bxf5 Ke7 7.Qxg7+ Kd8 8.Bxd7 Qe7 9.Qxe7+ Kxe7 10.Rf7+ Kd8 11.Bxb5 0:19 1/11 3.13 4235520 1.Rh8+ Kxh8 2.Qh4+ Kg8 3.Qh7+ Kf8 4.g5 f5 5.exf5 Ke7 6.f6+ Kd8 7.fxg7 Kc8 8.g8=Q Qxg8 9.Qxg8+ Kb7 10.Qf7 bxc4 11.h4 0:54 2/12 3.81 13498929 1.Rh8+ Kxh8 2.Qh4+ Kg8 3.Qh7+ Kf8 4.g5 f5 5.exf5 Ke7 6.f6+ Kd8 7.Qxg7 Kc8 8.f7 Qd8 9.f8=Q Kb7 10.Qxd8 Rxd8 11.cxb5 Bxb5 Finding a forced mate is going to be very difficult, because after 1.Rh8+ Kxh8 2.Qh4+ Kg8 3.Qh7+ Kf8 4.g5, Black has at least two options that don't lead to a quick mate -- 4...f5 and 4...Ke7. [D]rr2qk2/2pb2pQ/3p1pP1/ppnPp1P1/2P1P3/8/PP4BP/5RK1 b - - 0 4 Finding a mate from here is not easy.... jm
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