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Subject: u2600 - rook sac from Lambchop-Grok

Author: Peter Kappler

Date: 09:28:41 04/27/99

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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.



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