Author: Rob Basham
Date: 15:46:57 04/03/05
Go up one level in this thread
On April 03, 2005 at 16:27:47, John Merlino wrote: >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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