Author: Koundinya Veluri
Date: 00:20:07 09/26/03
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On September 25, 2003 at 11:45:15, Tord Romstad wrote: >In the latest round of the Open Class of the Regensburg Winboard Circuit, >my program (playing black) reached the following position: > >[D]r5k/P6p/Q4pp/3p3r/3pb/5P/2P2KPq/R1R2B b - - bm Bxf3; > >Because of the strong attack against the white king, my program evaluates >the position as very good for black. Unfortunately, it was not able to >find a forced win quickly enough. The continuation was Qh4+ Kg1 Qf4 >(there was a draw here by Qh2+, of course), and my program eventually lost. > >When analysing the game with the help of my engine, I found that Bxf3! >seems to win for black. My engine needs 2 minutes and 18 seconds to >find this move when running on an Athlon MP 2.0 GHz (analysis below), >which I find quite disappointing. > >How fast do other engines solve this position? > King of Kings 2.40 needs 27 seconds on a Xeon 3.06. The improved king safety stuff seems to be helping, since 2.30 can't find it in a long time. 5 1 31 100000 [+=] Qh4+ Kg1 5 98 40 130579 Qh4+ g3 Qh2+ Bg2 Rf5 Qe6+ Kh8 Ra3 h6 5 98 53 177549 Qh4+ g3 Qh2+ Bg2 Rf5 Qe6+ Kh8 Ra3 h6 6 68 100 341698 [--] Qh4+ Kg1 Qf4 Qe6+ Kh8 Re1 Qh2+ Kf2 Rf5 Rxe4 dxe4 Qxe4 Qh4+ Qxh4 Rxf3+ gxf3 6 109 140 487117 Qh4+ Kg1 Qf4 Qe6+ Kg7 Qe7+ Kh6 Re1 Qh2+ Kf2 Rf5 Rxe4 dxe4 Qxe4 6 109 170 598422 Qh4+ Kg1 Qf4 Qe6+ Kg7 Qe7+ Kh6 Re1 Qh2+ Kf2 Rf5 Rxe4 dxe4 Qxe4 7 79 264 929603 [--] Qh4+ Kg1 Qf4 Qe6+ Kh8 Re1 Qh2+ Kf2 Rf5 Rxe4 dxe4 Qxe4 Qh4+ Qxh4 Rxa7 7 46 467 1637789 Qh4+ Kg1 Qf4 Qe6+ Kg7 Re1 Bxf3 Qd7+ Kh6 Re7 Qg3 Rxh7+ Kg5 Rxh5+ Kxh5 Qh3+ Qxh3 gxh3 7 46 675 2420830 Qh4+ Kg1 Qf4 Qe6+ Kg7 Re1 Bxf3 Qd7+ Kh6 Re7 Qg3 Rxh7+ Kg5 Rxh5+ Kxh5 Qh3+ Qxh3 gxh3 8 16 1139 4123964 [--] Qh4+ Kg1 Qf4 Re1 Qh2+ Kf2 Qh4+ Kg1 Qh1+ Kf2 Bxc2 Qc6 Qh4+ Kg1 Rxa7 Rxa7 Qxe1 Qxc2 8 0 1728 6235558 Qh4+ Kg1 Bxf3 Qb7 Qh2+ Kf2 Qh4+ Kg1 8 1 1951 7082204 [+=] Qf4 Qc6 8 96 2103 7676917 [++] Qf4 Qc6 Bxf3 Qxa8+ Kg7 Qf8+ Kxf8 a8=Q+ Kg7 Ra7+ Kh6 Qf8+ Kg5 Qa3 Bxg2+ Ke2 Bxf1+ Ke1 8 112 2423 8924728 Qf4 Re1 Rh2 Qe6+ Kg7 Rxe4 dxe4 Qxe4 Qxe4 fxe4 h6 8 113 2661 9898522 [+=] Bxf3 Qe6+ 8 135 2764 10293591 Bxf3 Qc6 Qf4 Qxa8+ 8 135 2831 10561816 Bxf3 Qc6 Qf4 Qxa8+ 9 146 3104 11621096 Bxf3 Qe6+ Kg7 Qe7+ Kh6 Qxf6 Be4 Qxd4 Rf5+ Ke1 Qg3+ Ke2 Bxg2 Qe3+ Qxe3+ Kxe3 Bxf1 Rxf1 Rxf1 Rxf1 Rxa7 9 146 3940 15011861 Bxf3 Qe6+ Kg7 Qe7+ Kh6 Qxf6 Be4 Qxd4 Rf5+ Ke1 Qg3+ Ke2 Bxg2 Qe3+ Qxe3+ Kxe3 Bxf1 Rxf1 Rxf1 Rxf1 Rxa7 10 184 5306 20465212 Bxf3 Qxf6 Bxg2 Bxg2 Rf5+ Qxf5 gxf5 Re1 Qf4+ Bf3 Kf7 Kg2 Qd6 Kf2 Koundinya
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