Author: Sune Fischer
Date: 11:25:47 03/28/03
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On March 28, 2003 at 06:27:56, Lyn Harper wrote: > Put CM on it's 'solve for mate', which turns the selective search off, and > it will solve the problem in the wink of an eye. At least it did on my P4 >1.3Ghz. Yeah, but that's cheating :) Seriously, I think every program here will find it in a "mate search". The trick is to make the standard program solve it fast too. Frenzee with standard search: 1 98 0 5 1.gxh4 2 464 0 84 1.gxh4 Kxh4 3 464 0 449 1.gxh4 Kxh4 2.Bxg4 4 464 0 1338 1.gxh4 Kxh4 2.Bxg4 Bxf4 4 566 0 1667 1.fxg5 hxg5 2.gxh4 Kxh4 5 566 0 2527 1.fxg5 hxg5 2.gxh4 Kxh4 3.Bxg4 6 566 2 4546 1.fxg5 hxg5 2.gxh4 Kxh4 3.Bxg4 Kxg4 7 566 2 7765 1.fxg5 hxg5 2.gxh4 Kxh4 3.Bxg4 Kxg4 4.Rxd7 8 659 3 15599 1.fxg5 hxg5 2.gxh4 Kxh4 3.Bxg4 Kxg4 4.Rxd7 Kf3 9 790 8 47115 1.fxg5 hxg5 2.Ne3 Kh6 3.Nxg4+ Rxg4 4.Bxg4 d6 5.Rxd6 e3 10 790 11 69579 1.fxg5 hxg5 2.Ne3 Kh6 3.Nxg4+ Rxg4 4.Bxg4 d6 5.Rxd6 e3 6.Bxh3 11 811 19 137178 1.fxg5 hxg5 2.Ne3 Kh6 3.Bxg4 Rh5 4.Rxd7 Kh7 5.Rxf7+ Kh8 6.Bxh5 gxh5 12 827 45 372723 1.fxg5 hxg5 2.Ne3 Kh6 3.Bxg4 Rxg4 4.Nxg4+ Kh7 5.Rxd7 Kg8 6.Rd8+ Kh7 7.Kb4 e3 12 1065 63 521373 1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kxh4 4.Nxg4 Kh5 5.Nf2+ Kh4 6.Nxe4 g4 7.Nxd6 13 1234 87 748002 1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 5.hxg5 Kg8 6.Rxd6 Kh8 7.Rd4 Kh7 14 1269 147 1306876 1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 5.hxg5 Kg8 6.Rxd6 e3 7.Rd7 Kh7 8.Nxe3 15 1274 273 2512258 1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 5.hxg5 Kg8 6.Nh6+ Kh7 7.Rxd6 e3 8.Nxf7 Kg8 9.Rd8+ 16 299979 697 6561130 1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 17 299981 2151 20417087 1.Ne3 d6 2.fxg5 hxg5 3.gxh4 Kh6 4.Nxg4+ Kh7 so, a mate in 11 after 7 secs, mate in 10 after 35 secs (TB 2400+). Clearly a nullmove blindspot here. In "mate search" mode (ie. without nullmove): 1 98 0 5 1.gxh4 2 464 0 83 1.gxh4 Kxh4 3 464 0 433 1.gxh4 Kxh4 2.Bxg4 4 464 0 1716 1.gxh4 Kxh4 2.Bxg4 Bxf4 4 566 0 2041 1.fxg5 hxg5 2.gxh4 Kxh4 5 566 1 9177 1.fxg5 hxg5 2.gxh4 Kxh4 3.Bxg4 6 597 6 36346 1.fxg5 hxg5 2.Ne3 Kh6 3.Nxg4+ Rxg4 4.Bxg4 6 299993 17 116371 1.Nc3 e3 2.Rb5 d6 3.Nd5 Bxf4 7 299993 24 159754 1.Nc3 e3 2.Rb5 d6 3.Nd5 Bxf4 4.Nxf4++ 8 299993 81 596961 1.Nc3 e3 2.Rb5 d6 3.Nd5 Bxf4 4.Nxf4++ 9 299993 284 2136769 1.Nc3 e3 2.Rb5 d6 3.Nd5 Bxf4 4.Nxf4++ that's 0.17 secs, or if rounded off - instantly. -S.
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