Author: James Robertson
Date: 07:11:41 03/09/99
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On March 09, 1999 at 02:55:58, Steffen Jakob wrote: >Hi! > >Today Hossa lost a game in the following position because he didn't take care >enough of his king: > >4r1k1/1Bpq1ppp/1bNp4/P3p3/3PPnb1/2P5/2Q2PPP/4RRK1 b > >Hossa had white against "blunite" and the last move was a5? Black won with Bf3!! >How long does your program take to see that Bf3!! is winning (or does it find an >even better move?)? Here is the analysis of Hossa: > >depth value time nodes pv > 1 -890 0.02 21 1... d7xc6 2.b7xc6 > 1 -441 0.04 99 1... f4xg2 2.g1xg2 > 2 -441 0.06 650 1... f4xg2 2.g1xg2 >! 3 -310 0.10 1769 1... f4xg2 2.g1xg2 g4h3 3.g2g1 h3xf1 4.e1xf1 > 4 -337 0.60 27560 1... e5xd4 2.c3xd4 f4xg2 3.g1xg2 g4h3 4.g2g1 h3xf1 > 5.e1xf1 > 5 -333 0.80 37229 1... e5xd4 2.c3xd4 f4xg2 3.g1xg2 g4h3 4.g2h1 h3xf1 > 5.e1xf1 > 6 -370 2.33 125529 1... e5xd4 2.c3xd4 f4xg2 3.e1c1 b6xd4 4.g1xg2 > 6 -326 8.53 483797 1... f4xg2 2.e1b1 g2f4 3.f1e1 f4e2 4.e1xe2 g4xe2 > 5.c2xe2 > 7 -347 12.55 706240 1... f4xg2 2.e1b1 g2f4 3.f1e1 f4h3 4.g1f1 e5xd4 > 5.a5xb6 >! 7 -120 48.09 2540272 1... g4f3 2.h4 f3xg2 3.a5xb6 c7xb6 4.c6xe5 d6xe5 > 8 -97 1:00 3240537 1... g4f3 2.b7c8 d7xc6 3.d5 f3xe4 4.e1xe4 f4xd5 > 5.a5xb6 e8xc8 >! 9 80 7:17 24749284 1... g4f3 2.h3 f3xg2 3.a5xb6 g2xf1 4.e1xf1 c7xb6 > 5.d4xe5 d7xb7 >! 10 171 20:04 66462256 1... g4f3 2.h3 f3xg2 3.e1e3 g2xf1 4.g1xf1 b6xa5 > 5.f1g1 a5b6 > >BTW: the blitz game ended with > > 24. a5 Bf3 > 25. dxe5 Qg4 > 26. Ne7+ Rxe7 > 27. axb6 Qxg2# > > > >Greetings, >Steffen. Here is my program's output: 1 -412 0 209 exd4 axb6 dxc3 Qxc3 cxb6 2 -412 50 711 exd4 axb6 dxc3 Qxc3 cxb6 3 -349 50 5789 Nxg2 Kxg2 Bh3+ Kg1 Bxf1 Rxf1 4 -399 160 18266 Nxg2 Ra1 exd4 axb6 cxb6 Kxg2 Qxb7 cxd4 5->-348 490 62912 exd4 cxd4 Nxg2 Kxg2 Bh3+ Kg1 Bxf1 Kxf1 5 -348 990 134258 exd4 cxd4 Nxg2 Kxg2 Bh3+ Kg1 Bxf1 Kxf1 6 -357 1590 222180 exd4 cxd4 Nxg2 Ra1 Bf3 axb6 Bxe4 7->-347 3400 481050 Nxg2 Kxg2 Bh3+ Kh1 Bxf1 Rxf1 Qh3 7 -347 5870 839917 Nxg2 Kxg2 Bh3+ Kh1 Bxf1 Rxf1 Qh3 8-> -91 23230 3220899 Bf3 Bc8 Qxc6 axb6 Nxg2 b7 Nxe1 Rxe1 8 -91 23950 3336199 Bf3 Bc8 Qxc6 axb6 Nxg2 b7 Nxe1 Rxe1 9 -164 53000 7060743 Bf3 axb6 Bxg2 Nxe5 dxe5 bxc7 Bxf1 c8=q Rxc8 Bxc8 Qxc8 Kxf1 exd4 10 28 143190 19321909 Bf3 h3 Bxg2 axb6 cxb6 Na7 Bxf1 Bc6 Qxa7 Bxe8 Bxh3 It finds the right move after 23 seconds, although it does not realise that it wins. James
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