Author: John Merlino
Date: 13:27:47 04/03/05
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On April 03, 2005 at 14:55:27, John Merlino wrote: >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 > >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 I let The King chug away on this position for more than an hour, to see if there is any big difference in score between 4...f5 and 4...Ke7. Here are the results: Time Depth Score Positions Moves 34:09 3/17 4.31 478447775 4...f5 5.exf5 Ke7 6.f6+ Kd8 7.Qxg7 Kc8 8.f7 Kb7 9.fxe8=Q Rxe8 10.cxb5 Rg8 11.Qh7 Rh8 12.Qe7 Rhe8 13.Qf7 Bxb5 1:02:46 3/17 5.03 872503256 4...Ke7 5.gxf6+ Kd8 6.Qxg7 Qxg6 7.Qxg6 Kc8 8.f7 Kb7 9.cxb5 Bxb5 10.Rf5 Rf8 11.Bf1 Bd7 12.Rf3 Rh8 13.h4 Rab8 14.b3 Ka7 The score for these two moves did not change significantly over the last half-dozen depths, so I would once again say that determining a forced mate from the initial position is not going to be easy.... jm
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