Author: John Stanback
Date: 12:18:03 04/27/99
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On April 27, 1999 at 12:28:41, Peter Kappler wrote: > >I noticed Will didn't post a position this week, so I'll share one from a game >Grok played as Black against Lambchop a couple of weeks ago on ICC. > >r3r2k/p1bb1pp1/qp5p/3pP3/PBp2P1Q/4P1RP/2B3P1/R5K1 w - - bm Rxg7; > >How long does it take your program to: >a) find Rxg7 >b) realize Rxg7 is winning > >This is probably easy for programs with the single-reply extension. > >Lambchop found this in a blitz game - I think Peter McKenzie reported that it >needed 6 seconds to see the move on his P133, and somewhere around 30-40 seconds >to see the win. (Correct me if I'm remembering this wrong, Peter) > >--Peter > > >P.S. Chess Genius 6 on my K6-300 finds Rxg7 instantly, and after a short time >announces mate in 8. Zarkov finds Rxg7 in less than a second on a P2-300. It sees that Rxg7 is winning in less than two seconds, but doesn't find a mate within 2 minutes. Zarkov extends 2 plies when in check under certain circumstances. I don't know if that helped here. Here's the output: 00:01.0 41344 5> 0 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 Qg5+ Kh8 Qh6+ Kg8 00:01.1 46083 6> 0 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 Qg5+ Kh8 Qh6+ Kg8 00:01.6 65424 6 50 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re6 Bh7+ Kh8 Qg7+ 00:02.1 82667 6 140 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Bxh3 Qxh3 Bxf4 00:03.4 133939 6 340 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Bxh3 Qg6+ Kh8 00:05.4 203193 6 540 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Bxh3 Qg6+ Kh8 00:05.9 226688 6 539 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Bxh3 Qg6+ Kh8 00:07.9 300928 6 577 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 Qg6+ Kh8 fxe7 00:08.4 328143 7> 577 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 Qg6+ Kh8 fxe7 00:14.2 559744 7 577 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 Qg6+ Kh8 fxe7 00:16.8 692530 8> 577 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 Qg6+ Kh8 fxe7 00:40.2 1476686 8 699 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 fxe7 Re8 Bh7+ 01:07.3 2352060 8 789 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 fxe7 Re8 Bh7+ 01:48.7 3892352 8 866 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 fxe7 Bxf5 01:53.6 4159733 9> 866 Rxg7 Kxg7 Qf6+ Kg8 Qxh6 f5 exf6 Re7 fxe7 Bxf5 John
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