Author: Jeff Lischer
Date: 14:41:26 01/07/06
Go up one level in this thread
On January 07, 2006 at 12:40:09, John Merlino wrote:
>On January 07, 2006 at 11:16:04, Albert Silver wrote:
>
>>In some testing against Toga in 20 min. games, Rybka played a strong maneuver,
>>and temporary pawn sac that preliminary analysis suggests may have been the
>>winning one.
>>
>>The following position arose after Toga's 36th move:
>>
>>[D]8/1r3q2/2p1p1k1/p1PpBppp/P1nP4/2P2PP1/4R1KP/4Q3 w - - 0 37
>>
>>Here Rybka played 37.h4! gxh4 (37...g4 will need to be better investigated)
>>38.Kh3!! hxg3 39.Qxg3+ Kh7 40.Bf4 Qf6 (I couldn't find any real improvement over
>>this BTW) 41.Qh4 Qxh4+ 42.Kxh4 Re7
>
>What about 38...Rb2?
>
>If 39.Rxb2 Nxb2 40.gxh4 f4! Draw
>If 39.Rxb2 Nxb2 40.Kxh4 Nxa4 41.Qa1 Qb7! Draw {42.Qxa4?? Qb1 Black wins}
>If 39.gxh4 Rxe2 40.Qxe2 Qg8 Draw {41.Qh2 Qf7 etc. -- this line may need more
>analysis}
>If 39.Kxh4?? Nxe5 40.dxe5 Rxe2 41.Qxe2 Qe7+ Black wins
>
>jm
After a very long think, both Toga 1.1 and Rybka 1.0 Beta think this is a draw
on my machine. Instead of 38. ... hxg3 or ... Rb2, they both play: 38. ... Nxe5
39. Rxe5 hxg3 4. Rxe6 Kh7 and from here their lines differ. But they both give
it 0.00 score. They both found this draw after about 5:00 minutes and still held
it after 2 hours. Any thoughts?
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