Author: Mike S.
Date: 14:03:46 04/15/03
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On April 15, 2003 at 16:29:32, John Merlino wrote: >On April 15, 2003 at 16:10:29, Mike S. wrote: > >>Test position by Hermann Seitz, 1986 >>[D]Bk6/1P2p1pp/RP1p3p/P7/2P5/4p3/4p1p1/4Kbrb w - - 0 1 >>(...) >Pretty amusing. The King in CM9000 reaches its maximum depth in less than one >second, announcing mate a handful of PVs before then. Note that The King's >maximum reported PV is only 31 plies, so the full mating sequence is not >reported.... Yes, in contrast to Shredder 7.SE (see below) which announces the mate not earlier than at depth 38. But fairly quick too :o) Although, if I'm not wrong the correct pv should only be 37 plies long... >Time Depth Score Positions Moves >0:00 25/32 0.00 12170 1.c5 dxc5 2.Ra7 c4 3.a6 c3 >0:00 26/33 0.00 12696 1.c5 dxc5 2.Ra7 c4 3.a6 c3 >0:00 27/34 0.00 13336 1.c5 dxc5 2.Ra7 c4 3.a6 c3 >0:00 28/35 0.00 13905 1.c5 dxc5 2.Ra7 c4 3.a6 c3 >0:00 29/36 0.00 63998 1.c5 dxc5 2.Ra7 c4 3.a6 c3 >0:00 30/37 0.00 86433 1.c5 dxc5 2.Ra7 c4 3.a6 c3 >0:00 31/38 0.00 87046 1.c5 dxc5 2.Ra7 c4 3.a6 c3 >0:00 31/38 Mate19 87634 1.Ra7 h5 2.Ra6 h4 3.Ra7 h3 4.Ra6 > h2 5.Ra7 g6 6.Ra6 g5 7.Ra7 h6 8.Ra6 > e6 9.Ra7 e5 10.Ra6 e4 11.Ra7 g4 > 12.Ra6 g3 13.Ra7 h5 14.Ra6 h4 15.Ra7 > h3 16.Ra6 >(...) >0:00 37/44 Mate19 90762 1.Ra7 h5 2.Ra6 h4 3.Ra7 h3 4.Ra6 > h2 5.Ra7 g6 6.Ra6 g5 7.Ra7 h6 8.Ra6 > e6 9.Ra7 e5 10.Ra6 e4 11.Ra7 g4 > 12.Ra6 g3 13.Ra7 h5 14.Ra6 h4 15.Ra7 > h3 16.a6 Hermann Seitz - # in 19 Bk6/1P2p1pp/RP1p3p/P7/2P5/4p3/4p1p1/4Kbrb w - - 0 1 Analysis by Shredder 7.SE (P3/700 MHz): 1.Ra7 -+ (-8.47) Depth: 1/1 00:00:00 (...) 1.Ra7 h5 2.c5 dxc5 3.a6 h4 = (0.00) Depth: 37/37 00:00:01 16kN 1.Ra7 h5 2.Ra6 g6 3.Ra7 h6 4.Ra6 g5 5.Ra7 d5 6.c5 g4 7.Ra6 h4 8.Ra7 h5 9.Ra6 h3 10.Ra7 h4 11.Ra6 h2 12.Ra7 h3 13.Ra6 e6 14.Ra7 e5 15.Ra6 +- (#19) Depth: 38/38 00:00:02 209kN 1.Ra7 h5 2.Ra6 g6 3.Ra7 h6 4.Ra6 g5 5.Ra7 e6 6.Ra6 g4 7.Ra7 g3 8.Ra6 h4 9.Ra7 h5 10.Ra6 h3 11.Ra7 h2 12.Ra6 h4 13.Ra7 h3 14.Ra6 d5 15.c5 +- (#19) Depth: 38/45 00:00:04 736kN Also interesting: Analysis by Yace Paderborn: 1.Ra7 -+ (-7.48) Depth: 1 00:00:00 (...) 1.Ra7 h5 2.c5 dxc5 3.a6 c4 = (0.00) Depth: 38/25 00:00:01 14kN (still no mate) (...) = (0.00) Depth: 50/35 00:00:02 25kN 1.Ra7 h5 2.c5 dxc5 3.a6 c4 = (0.00) Depth: 50/36 00:00:02 25kN 1.Ra7 h5 2.Ra6 e6 3.Ra7 h4 4.Ra6 h3 5.Ra7 h2 6.Ra6 g6 7.Ra7 h6 8.Ra6 h5 9.Ra7 h4 10.Ra6 e5 11.Ra7 h3 12.Ra6 e4 13.Ra7 g5 14.Ra6 g4 15.Ra7 g3 16.a6 d5 +- (#19) Depth: 51/36 00:00:02 54kN (...) 1.Ra7 h5 2.Ra6 e6 3.Ra7 h4 4.Ra6 h3 5.Ra7 h2 6.Ra6 g6 7.Ra7 h6 8.Ra6 h5 9.Ra7 h4 10.Ra6 e5 11.Ra7 h3 12.Ra6 e4 13.Ra7 g5 14.Ra6 g4 15.Ra7 g3 16.a6 d5 +- (#19) Depth: 62/37 00:00:02 59kN Here, the base (main) depth displayed is bigger than the selective depth. Nevertheless, Yace PB. is among the (few) engines who can solve this more or less immediatly. I think there are some older programs which might solve quickly too (which aren't available as engines), as I seem to remember... the position was used in the board chess computer days. IIRC, some of these machines could already find the mate. Or some black pawns had to be removed due to search depths limits, to create a shorter solution. Regards, Mike Scheidl
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