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Subject: Re: Can your program find Rxg2?

Author: Ed Schröder

Date: 08:15:24 04/28/02

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On April 27, 2002 at 18:12:27, Uri Blass wrote:

>The following position is from my last game
>
>[D]6k1/RR4p1/5p1p/4p3/8/P7/4rrPP/3K4 b - - 0 31
>
>I played 31...Rxg2 and after 32.a4 Ra2 my opponent resigned.
>
>
>
>After the game he said that he needed one more tempo.
>
>I said that I was lucky because I saw the idea of Rxg7+ that almost win the game
>only after I played 31...Rxg2.
>
>I played 31...Rxg2 fast because the move seemed to be almost forced(I did not
>like the idea of Rd2+ Kc1 and the idea of Ra2 with the double mate threat is
>gone)
>
>I also said in the anlaysis that the best was still 32.Rxg7+ Rxg7 33.Ra8+
>inspite of the fact that white is losing after 33...Kf7 34.Kxe2 Rg2+ because in
>the worst case black will need to sacrifice the rook for the a pawn when the
>black passed pawns are going to be srtronger than the rook.
>
>
>I find that some top programs cannot find 31...Rxg2
>for black because they do not evaluate correctly the pawn endgame.

Evaluating the pawn ending is hard, so many exceptions. Rebel does well in this
one.

Ed

==========================================================

00:00:01.1	2,11	9	352195	Rd2+ Kc1 Rc2+ Kb1 Rxg2 Rxg7+ Rxg7 Ra8+
00:00:02.0	2,16	10	948988	Rd2+ Kc1 Rc2+ Kb1 Rxg2 Rxg7+ Rxg7 Ra8+
00:00:09.2	1,32	11	7107453	Rd2+ Kc1 Rc2+ Kb1 Kh8 Rxg7 Rb2+ Ka1
00:00:19.3	1,32	12	15782374	Rd2+ Kc1 Rc2+ Kb1 Kh8 Rxg7 Rb2+ Ka1
00:00:35.2	1,41	13	29846753	Rd2+ Kc1 Rc2+ Kb1 Kh8 Rxg7 Rb2+ Ka1
00:00:38.1	1,41	13	32075720	Rxg2
00:00:46.0	2,35	13	39580994	Rxg2 Rxg7+ Rxg7 Rxg7+ Kxg7 Kxe2 Kf7 Kf3
00:01:15.8	2,35	14	66632211	Rxg2 Rxg7+ Rxg7 Rxg7+ Kxg7 Kxe2 Kf7
00:03:15.6	2,73	15	175393087	Rxg2 Rxg7+ Rxg7 Ra8+ Kf7 Kxe2 Rg2+

A1400


>Uri



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