Author: James Robertson
Date: 17:04:08 04/16/99
Go up one level in this thread
On April 16, 1999 at 17:12:16, Sarah Bird wrote: >I watched a game last night and the following position came up. >fen rnbqkb1r/1p4p1/1Pp2p2/p1Pp1nP1/3P1P2/P1N4B/8/R1BQK1NR/---W > >Black has just played f6. > >Here the white player played: >1) Kf2......Be7 >2) Nf3......Ne3 >After >3) Bxd3.....Rxh3 >4) Rxh3.....Bxh3 >5) Ne5......fxe5 >6) Qh5+ >Scored an easy win. > >I looked at the starting position with Fritz who immediately selects >1) Ra2 my CM also selects 1) Kf2 as played and for some reason expects a reply >from black of fxg which it evaluates as being +4.69 to white and it never >changes its evaluation and expects this move without switching, when Be7 as >played in the game although not great is better than -4.69 as are other moves. > >Anyways it appears to me that 1) Bxf5! appears to win almost immediately or am i >missing something about Bxf5!. > >Does anyone see a defence to 1) Bxf5. > >Thanks. >UltraB I believe Bxf5! is sound. My program doesn't see it after a very long think, but I stopped it on the 11th iteration (3 min), and apparently it requires 12. However, it sees very quickly that White is ahead if I force the move. BTW, my program now knows how to hog RAM! It analyzed this with a 4MB hash. James After 1. Bxf5: Dpth Score Time Nodes PV 1 180 0 207 Rxh1 2 191 0 450 Rxh1 Bxc8 Qxc8 3 199 50 1125 Rxh1 Qe2+ 4 175 50 2285 Rxh1 Bg6+ Kd7 Qg4+ Ke7 5 186 110 5739 Rxh1 Bg6+ Ke7 Kd2 Kd7 6 175 220 10408 Rxh1 Bg6+ Kd7 Qg4+ Ke7 Qg2 7 182 660 46668 Rxh1 Bg6+ Ke7 Qe2+ Be6 Qg2 Rh4 8 157 930 71241 Rxh1 Bg6+ Ke7 Qe2+ Be6 Qg2 Rh4 Kf1 9 168 3020 334501 Rxh1 Bg6+ Ke7 Qe2+ Be6 Qg2 Rh4 Nf3 Rh3 10 150 5330 669816 Rxh1 Bg6+ Ke7 Qe2+ Be6 Qg2 Rh4 Nf3 Rh3 Kd1 11 -93 10050 1311652 Rxh1 Bg6+ Ke7 Qe2+ Be6 f5 Qc8 Kf1 Rh4 Qe3 fxg5 fxe6 Qxe6 Qxg5+ 12 -100 13560 1905952 Rxh1 Bg6+ Ke7 Qe2+ Be6 f5 Qc8 Kf1 Rh4 Qe3 Rg4 fxe6 Rxg5 13 -101 41520 6122651 Rxh1 Bg6+ Ke7 Qe2+ Be6 f5 Qc8 Kf1 Rh4 Qe3 Rh2 fxe6 Qxe6 Qxe6+ Kxe6
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