Author: Uri Blass
Date: 14:41:45 12/13/02
Go up one level in this thread
On December 13, 2002 at 16:47:54, Ulrich Tuerke wrote: >On December 12, 2002 at 15:13:10, John Merlino wrote: > >>On December 12, 2002 at 14:54:03, Art Basham wrote: >> >>>Hi John........are you there? >>>How long does it take your program to ann. mate at move one? >>> >>>I think this is a forced nate in 13, but not sure...:-) >>> >>>[D]1r3k1r/6pp/p3Qp2/P7/q1P5/8/1n4PP/1R3R1K w - - 0 1 >>> >>>White plays 1. Rxf6+ >> >>Not long at all. CM9000, on a P3-733, announces Mate in 14 after 18 seconds, and >>does not improve on it with the two subsequent PVs. >> >>This is not very difficult, as all of White's moves are checks.... >> >>Time Depth Score Positions Moves >>0:00 1/3 0.00 5354 1.Qd6+ Kf7 2.Qc7+ Kg6 3.Qg3+ Kf7 >> 4.Qc7+ >>0:00 1/4 0.00 13640 1.Qd6+ Kf7 2.Qc7+ Kg6 3.Qg3+ Kf7 >> 4.Qc7+ >>0:00 1/4 5.13 24565 1.Rxf6+ gxf6 2.Qxf6+ Kg8 3.Qg5+ >> Kf7 4.Rf1+ Ke8 5.Qe5+ Kd8 6.Qxb8+ >> Kd7 7.Qxh8 >>0:00 1/5 4.96 49779 1.Rxf6+ gxf6 2.Qxf6+ Kg8 3.Qg5+ >> Kf8 4.Rf1+ Ke8 5.Qe5+ Kd8 6.Qxb8+ >> Kd7 7.Qxh8 Qc2 >>0:01 1/6 5.19 101046 1.Rxf6+ gxf6 2.Qxf6+ Kg8 3.Qg5+ >> Kf8 4.Rf1+ Ke8 5.Qe5+ Kd8 6.Qxb8+ >> Kd7 7.Qxh8 Qxc4 8.Qxh7+ Kd6 >>0:02 1/7 5.38 253295 1.Rxf6+ gxf6 2.Qxf6+ Kg8 3.Qg5+ >> Kf8 4.Rf1+ Ke8 5.Re1+ Kf8 6.Qf4+ >> Kg8 7.Qxb8+ Kf7 8.Qxh8 Qc2 9.Qe8+ >> Kg7 >>0:06 1/8 7.47 762540 1.Rxf6+ gxf6 2.Qxf6+ Kg8 3.Qg5+ >> Kf8 4.Rf1+ Ke8 5.Qe5+ Kd8 6.Qxb8+ >> Kd7 7.Qxb2 Qxc4 8.Rd1+ Ke6 9.Re1+ >> Kd5 10.Qxh8 >>0:18 1/9 Mate14 2176958 1.Rxf6+ gxf6 2.Qxf6+ Kg8 3.Qg5+ >> Kf8 4.Rf1+ Ke8 5.Re1+ Kf8 6.Qf4+ >> Kg8 7.Qxb8+ Kf7 8.Qc7+ Kg8 9.Qd8+ >> Qe8 10.Qxe8+ Kg7 11.Qe7+ Kg8 12.Qg5+ >> Kf7 13.Re7+ Kf8 14.Qg7# > > >CM sees a mate in 14 in iteration no 1 ? No It is not iteration 1 but iteration 9. 1 is only the brute force depth that is used(by chessmaster definition every program that is using null move pruning without zugzwang detection is searching depth 1 because if there are moves with no threat they are not searched to more than depth 1 by chessmaster's definition) chessmaster often search depth 1 in the middle game because in the middle game it does not care for zugzwang detection. Uri
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