Author: Francis Monkman
Date: 03:17:02 05/25/99
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On May 25, 1999 at 02:20:40, Jeremiah Penery wrote: >Could you post these positions? I'd like to take a look at them, if possible. >:) I'll post one of them -- I'd rather not be responsible for the discussions that would 'inevitably' follow the other (in fact I have a few questions for Suba myself!): [from Suba-Tompa, Varna 1976] 4nr2/1b2qppk/1p5p/r1p1P3/2QP1n2/1P3NR1/1B4PP/3BR1K1 w - - Play continued: 26. Bc2+ g6 (26. ...Kg8 27. d5 Nxd5 (27....Ra2 28. Qxf4 Rxb2 29. d6) 28. Qd3 g6 29. e6 Nf4 30. Qc4!; 26. ...Kh8 27. d5 g5! (27. ...Ra2 Qe4; 27. Nxd5 Qd3) 28. e6+ f6 29. Nxg5 hxg5 30. Rxg5) 27. d5! Nxd5 28. e6! f5 29. Ng5+! Kg8 30. Nf7 Rxf7 (30. ...Kh7 31. Nxh6!) 31. exf7+ Qxf7 32. Qh4 Ra2 (32. ...Kh7 33. Bxf5! Qxf5! 34. Re7!) 33. Qxh6 1-0 I tried several programs from the start of this sequence, but it soon became clear that no alternative to 26. cxd5 (exchanging queens unnecessarily, a common computer stupidity, *especially when playing White!*) would be quickly found. Starting them from move 27, Crafty 16.6 did best, identifying 27. d5! as clearly the best, after 4:10, score +.75. (I might mention its analysis showed 28. Qg4 Rg8 etc., which must be allowed to be just about as effective as the text, athough nowhere near as picturesque!). LGG 2.0 flirted with the idea of 27. d5!, which kept emerging during the search, only to be discarded in favour of the mundanity mentioned above (ie now 27. cxd5). (Possibly its slightly over- optimistic assessments *in general* tipped this particular balance?) Well, as I said before, CSTal II finds 26. Bc2+ immediately, coupled with the idea of 27. d5!... Congrats, Chris! (!) Francis
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