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Subject: Re: To ?? or to !!

Author: Josh Strayhorn

Date: 20:24:49 12/18/00

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On December 18, 2000 at 22:59:33, Laurence Chen wrote:

>This position has bothered the most for the longest time, it was fascinating to
>see that the chess engines I used to analyse this position gives a ? or ?? for
>Black's move 26. ... Bg7.  Eric Schiller awarded this move !!, Fritz awarded ??,
>so the $64.00 question, who is right? The position is listed below before
>Black's 26. ... Bg7
>[D]r5k1/ppp4p/3p3b/3Pn3/1n1KP1p1/1P3rP1/PBB1N2R/R2Q4 b - - 0 26
>
>Now Fritz 6, and Gambit Tiger like the move 26. ... c5+, when I play the move
>26. ... Bg7, both engines think that White can save this position, can this
>position be really saved after 26. ... Bg7?
>
>[D]r5k1/ppp3bp/3p4/3Pn3/1n1KP1p1/1P3rP1/PBB1N2R/R2Q4 w - - 0 27
>
>This position seems to be a tough nut to crack.  It could be one of those
>positions which humans are better than chess engines in tactics !!!

Looks to me like the computers are right.
Consider the line:

26. ... Bg7? 27. Ng1! c5+  28. dxc6 Ned3+  29. e5! Bxe5  30. Kc4 b5+  31. Kxb5
Rb8+  32. Ka4 Nxb2+  33. Ka3

[D]1r4k1/p6p/2Pp4/4b3/1n4p1/KP3rP1/PnB4R/R2Q2N1 b - - 0 33

Where Black has nothing more than the perpetual check with Nc4+ because of

33. ...Nxd1?  34. Bxh7+! Kg7  35. c7

[D]1r6/p1P2k1B/3p4/4b3/1n4p1/KP3rP1/P6R/R2n2N1 b - - 0 0



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