Author: Jaime Benito de Valle Ruiz
Date: 17:46:38 10/07/03
Go up one level in this thread
On October 07, 2003 at 20:35:29, Slater Wold wrote: >On October 07, 2003 at 19:18:34, Jaime Benito de Valle Ruiz wrote: > >>[d]3r1r2/pb3pkp/1pn2Np1/2p1PP2/8/b2BQ3/qP4PP/3R1R1K w - - 0 3 >> >>1.Nh5+ is a winning move, but the really smashing one is 1.Nxh7! > >I cannot find an engine that does not select Nh5+ right off the bat. Granted, >most have either negative or draw scores, that creep up slightly after time >passes. Crafty 19.4, Tao, SmarThink, etc., etc. > >Nxh7 however is "extension heavy" I believe. All engines pause and seem to take >a deep look at it, but most don't choose it. > >However, Ruffian does something interesting. It finds Nh5+, likes it, finds a >draw score with it, fails high on it, evens out at +1.25, then it fails low on >Nh5+ with a draw score, takes a deep look at Nxh7 and chooses it. Weird! > > >Ruffian 1.0.5 >3r1r2/pb3pkp/1pn2Np1/2p1PP2/8/b2BQ3/qP4PP/3R1R1K w - - 0 1 > >Analysis by Ruffian 1.0.5: > >1.bxa3 Qxa3 2.fxg6 hxg6 > µ (-0.98) Depth: 1/4 00:00:00 >1.bxa3 Qxa3 2.fxg6 hxg6 > µ (-0.98) Depth: 2/8 00:00:00 >1.bxa3 Nxe5 2.Nh5+ Kg8 3.Qxe5 gxh5 > -+ (-1.57) Depth: 3/10 00:00:00 >1.bxa3 Nxe5 2.Nh5+ gxh5 3.Qxe5+ Kh6 > -+ (-1.59) Depth: 4/11 00:00:00 >1.bxa3 Nxe5 2.Nh5+ gxh5 3.Qxe5+ Kg8 4.Qg3+ Kh8 5.Qe5+ Kg8 > -+ (-1.57) Depth: 5/16 00:00:00 >1.bxa3 Nxe5 2.Nh5+ Kg8 3.Nf6+ Kh8 4.Be4 Bxe4 5.Qxe4 > -+ (-2.20) Depth: 6/17 00:00:00 160kN >1.fxg6 fxg6 2.bxa3 Nxe5 3.Nh5+ Kg8 4.Rxf8+ Rxf8 5.Qxe5 gxh5 6.Be2 > -+ (-1.76) Depth: 6/19 00:00:00 545kN >1.fxg6 fxg6 2.bxa3 Nxe5 3.Be4 Rxf6 4.Bxb7 Rxd1 5.Rxd1 > -+ (-2.37) Depth: 7/21 00:00:01 1363kN >1.bxa3 Nxe5 2.Nh5+ Kg8 3.Nf6+ Kh8 4.Be2 Nc4 5.Qe7 > -+ (-2.17) Depth: 7/21 00:00:01 1608kN >1.Nh5+ > -+ (-1.41) Depth: 7/23 00:00:02 2469kN >1.Nh5+ Kh8 2.Qh6 Rg8 3.fxg6 fxg6 4.Nf6 Rg7 5.bxa3 Nxe5 > µ (-1.09) Depth: 7/23 00:00:02 2516kN >1.Nh5+ Kh8 2.Qh6 Rg8 3.fxg6 fxg6 4.Bxg6 Rxg6 5.Rxd8+ Nxd8 6.Rf8+ Qg8 7.Rxg8+ >Kxg8 8.Nf6+ Rxf6 9.Qxf6 > µ (-0.81) Depth: 8/23 00:00:02 2924kN >1.Nh5+ > ³ (-0.46) Depth: 9/27 00:00:06 6586kN >1.Nh5+ Kh8 2.Qh6 Rg8 3.fxg6 fxg6 4.Bxg6 Rxg6 5.Rxd8+ Nxd8 6.Rf8+ Qg8 7.Rxg8+ >Kxg8 8.Nf6+ Rxf6 9.Qxf6 Bxb2 10.Qxd8+ > = (-0.18) Depth: 9/27 00:00:06 7195kN >1.Nh5+ > = (0.17) Depth: 10/31 00:00:10 12039kN >1.Nh5+ Kh8 2.Qh6 Rg8 3.fxg6 fxg6 4.Bxg6 Rxg6 5.Rxd8+ Nxd8 6.Rf8+ Qg8 7.Rxg8+ >Kxg8 8.Nf6+ Rxf6 9.exf6 Bxg2+ 10.Kxg2 Bxb2 > ² (0.45) Depth: 10/31 00:00:11 13165kN >1.Nh5+ > ± (0.80) Depth: 11/31 00:00:18 21319kN >1.Nh5+ Kh8 2.Qh6 Rg8 3.fxg6 fxg6 4.Bxg6 Rxg6 5.Rxd8+ Nxd8 6.Rf8+ Qg8 7.Rxg8+ >Kxg8 8.Nf6+ Kf7 9.Qxh7+ Ke6 10.bxa3 Rxg2 > +- (1.60) Depth: 11/31 00:00:22 26525kN >1.Nh5+ > ± (1.25) Depth: 12/35 00:01:18 98714kN >1.Nh5+ Kh8 2.Qh6 Rg8 3.fxg6 fxg6 4.Bxg6 Rxg6 5.Rxd8+ Nxd8 6.Rf8+ Qg8 7.Rxg8+ >Kxg8 8.Nf6+ Kf7 9.Qxh7+ Rg7 10.Qh5+ Rg6 11.Qh7+ > = (0.00) Depth: 12/35 00:01:36 121585kN >1.Nxh7 Rxd3 2.Rxd3 Kxh7 3.fxg6+ fxg6 4.Qh3+ Kg8 5.Rxf8+ Kxf8 6.Qh8+ Ke7 7.Qg7+ >Qf7 8.Rd7+ Kxd7 9.Qxf7+ Ne7 10.bxa3 Bd5 11.Qf4 > +- (1.44) Depth: 12/35 00:05:54 417987kN This is what I found interesting about this position: How the score changes so much all of a sudden in certain positions, and how some "apparently" harmless position could cause so much damage!
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