Author: John Stanback
Date: 19:44:13 05/09/00
Go up one level in this thread
On May 09, 2000 at 20:08:10, Dann Corbit wrote: >On May 09, 2000 at 20:05:02, John Stanback wrote: >>On May 09, 2000 at 10:34:20, Mark Andreoli wrote: >>> I recently played a 5 minute blitz game against International Master Nenad >>>Aleksic. see moves below: (I lost as I am black.) >>> >>> 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O >>> >>> 8.Bc4 Nc6 9. Bb3 Bd7 10.g4 Qa5 11.h4 Rfc8 12.h5 Ne5 13.hxg6 hxg6 >>> >>> 14.Bh6 Bh8 15.Qd2 b5 16.O-O-O Nc4 17.Bxc4 Rxc4 18.Nb3 Qc7 19.Bf8!! OK >>> >>> "gang" the parties over. All variations are FORCED and win rather quickly >>> for white. The game continued 19. ... Rxf8 20.Rxh8+ Kxh8 21.Qh6+ Kg8 >>> >>> 22.Rh1 Nh5 22. gxh5 Rxc3 23.hxg6 1-0 >>> >>> My question is _why_ can't the above mentioned "engines" F5/F6/Hiarcs >>>find the move 19. Bf8 (Nenad found it in only 20 seconds). The engines all want >>>to play Bg5?? >>> >>> _which wins too_ in a __long endgame_ however I thought nothing could >>>beat these chess computers when it came to tactics. >>> Maybe I overlooked something? Maybe Junior,Rebel,CM 7000 or Chess Tiger >>>can find this "simple but elegant tactical shot"! Could anyone help me out by >>>checking the position after the 18th move. I would love to be corrected and/or >>>enlightened. Thanks for any help in solving this _mystery_!? MJA :-( >> >>Zarkov takes 2:52 on a K6-550: >> >> >>00:01.0 38784 5> 68 g5 b4 Ne2 Nh5 Nbd4 >>00:01.1 39442 5 114 Bg5 b4 Bxf6 Bxf6 Nd5 Kg7 >>00:01.4 63104 5 141 Bg5 Bg7 Bxf6 Bxf6 Nd5 Qc6 Nxf6+ exf6 >>00:01.4 66204 6> 141 Bg5 Bg7 Bxf6 Bxf6 Nd5 Qc6 Nxf6+ exf6 >>00:01.8 93184 6 141 Bg5 Bg7 Bxf6 Bxf6 Nd5 Qc6 Nxf6+ exf6 >>00:02.1 114163 7> 141 Bg5 Bg7 Bxf6 Bxf6 Nd5 Qc6 Nxf6+ exf6 >>00:03.7 235904 7 166 Bg5 Bg7 Bxf6 exf6 Qxd6 Qxd6 Rxd6 Rc7 >>00:05.0 345626 8> 166 Bg5 Bg7 Bxf6 exf6 Qxd6 Qxd6 Rxd6 Rc7 >>00:09.4 717824 8 193 Bg5 Bg7 Bxf6 exf6 Qxd6 Qxd6 Rxd6 Be8 Nd5 >>00:10.5 812957 9> 193 Bg5 Bg7 Bxf6 exf6 Qxd6 Qxd6 Rxd6 Be8 Nd5 >>00:21.5 1658880 9 177 Bg5 Bg7 Bxf6 exf6 Qxd6 b4 Qxc7 Rxc7 Nd5 Rb7 >>02:52.3 12780800 9 193 Bf8 Rxf8 Rxh8+ Kxh8 Qh6+ Kg8 Rh1 Nh5 gxh5 Rxc3 >>02:53.7 12904562 10> 193 Bf8 Rxf8 Rxh8+ Kxh8 Qh6+ Kg8 Rh1 Nh5 gxh5 Rxc3 > >Another amazing result. Can you comment on how your program was able to find >this by ply 9? After investigating this, I find that Zarkov was quite lucky. My current re-capture extensions are pretty heavy and allow it to search one extra ply in the critical line. Also, a "feature" (bug?) in my one-reply check extension routine made it double-extend after Qh6+ in the line below: Bf8 Rxf8 Rxh8+ Kxh8 Qh6+ Kg8 Rh1 Nh5 gxh5 Rxc3 hxg6 Rxc2+ Kb1 Rxb2+ KxR even though black has two legal moves. John
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