Author: Heiner Marxen
Date: 21:29:59 10/11/01
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On October 10, 2001 at 13:18:10, Sven Reichard wrote: >On October 10, 2001 at 13:16:34, Sven Reichard wrote: > >>Thought you might like this. >> >>Bernhard Gaerths, "Das Matt", 1942 >> > >corrected diagram, sorry, typing directly from the diagram >[D] 8/8/ppPP4/kp1Pp1P1/1p2P1pb/1K1P4/P4Bpp/8 w - - >> >>Please indicate your result! I'd also be interested in what other programs >>think. >> >>Alice fails to solve it in reasonable time. >> >>Sven. Chest confirms the mate in 12, as found by others already. On a K7/600 with 350 MB hash it needs 6 minutes to come up with PV: Be1 Bxe1 d7 h1=Q d8=N Qh7 Nb7+ Qxb7 cxb7 g1=Q b8=N Qc5 Nc6+ Qxc6 dxc6 g3 c7 g2 c8=N g1=Q Nd6 Qh1 Nb7# The last depth eats most of the time: # 1 0.00s 0kN 0.87 1- 0 # 2 0.00s 0kN 1.00 1- 0 # 3 0.00s 0kN [ 8.12] 0.97 22- 0 # 4 0.00s 1kN [ 4.64] 1.09 180- 0 # 5 0.02s 4kN [ 3.02] 1.48 707- 0 # 6 0.12s [ 6.00] 11kN [ 2.84] 1.93 2186- 0 # 7 0.36s [ 3.00] 25kN [ 2.36] 2.87 5098- 0 # 8 1.04s [ 2.89] 64kN [ 2.54] 3.82 13247- 0 # 9 2.74s [ 2.63] 173kN [ 2.70] 5.03 32838- 0 # 10 7.39s [ 2.70] 481kN [ 2.78] 6.13 85893- 0 # 11 27.98s [ 3.79] 2042kN [ 4.25] 5.49 320239- 0 # 12 358.89s [ 12.83] 29431kN [ 14.42] 5.25 3751060- 4546 which is not so very surprising due to the promotions. Interesting is that Chest manages to have a moderate branching factor most of the depth, here. It has some special chess knowledge kicking in, when the attacker has nothing left but pawns (besides its king). That helps here a lot. Cheers, Heiner
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