Author: Vasik Rajlich
Date: 02:20:15 08/17/04
Go up one level in this thread
On August 16, 2004 at 14:40:34, Martin Giepmans wrote: >On August 16, 2004 at 13:05:35, Vasik Rajlich wrote: > >>On August 16, 2004 at 08:46:12, Vincent Lejeune wrote: >> >>>I found this position here http://www.fierz.ch/pontresina.htm , after I searched >>>10 min with no board and then 10 with a board and then 20 with chessengine, I >>>gave up ... is this position buggy ?? >>> >>>pasting : >>> >>> A cool (and very instructive) position which occurred in round 5: black to move >>>and win! This one is harder than you think :-) >>>Click here for a hint! >>>The obvious 1... c4+ only draws. To win, you need to know something about >>>'corresponding squares'. >>> >>>[d]8/8/4p2p/1kp1P1p1/1p4P1/1P1K2P1/7P/8 b - - 0 1 >> >>That is a cool anti-computer problem! White's possibilities with the h-pawn will >>keep any engine from getting it. >> >>Try putting the white h2 pawn on h5 and with a reasonable hash table any engine >>should handle it. > >I guess that you mean h4 instead of h5? With the white h2 pawn on h5 the obvious >move (c4) is a clear win. A least that's what my engine thinks. Score jumps to >approx. + 20 within a few seconds, so unless I have a huge bug ... :) > >Martin > Aha, yes - white needs to be able to pass once after .. c4+ bxc4+ Kc5. With the white pawn on h4 as you mention it should work, and be more engine-friendly than with the pawn on h2. Anyway, Dieter showed in the above thread that there is a second win for black, with .. Ka5 and .. c4 right away. Less elegant, but more forcing. Vas > >> >>As for the correspondences, start with >> >>b5 & d3 (else .. c4) >>c6 & e4 (else .. kd5) >> >>and it's easy from there ... >> >>Vas
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