Author: Albert Silver
Date: 15:28:57 01/07/06
Go up one level in this thread
On January 07, 2006 at 17:41:26, Jeff Lischer wrote:
>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?
I looked at it and couldn't refute it, so it would seem correct. I'll look again
later, but I think you found it.
Albert
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