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Subject: Re: a mistake in the gcp test suite(ECM 1945) Rf3 is another solution

Author: Robert Hyatt

Date: 14:00:20 11/13/02

Go up one level in this thread


On November 13, 2002 at 10:24:44, Uri Blass wrote:

>On November 13, 2002 at 09:43:36, Bob Durrett wrote:
>
>>On November 13, 2002 at 06:48:47, Joachim Rang wrote:
>>
>>>yep, I think you're right.
>>>
>>>This is what I got from DF 7 on depth 15:
>>>
>>>New game
>>>5rk1/p1p1br2/1p1p2qp/4p3/2PPn1pP/3Q2P1/PPN1P1K1/2RR2B1 b - - 0 1
>>>
>>>Analysis by Deep Fritz 7:
>>>
>>>1. -+ (-3.31): 1...Bxh4 2.gxh4 Rf3 3.dxe5 Rxd3 4.exd3 dxe5 5.Be3 Nd6 6.h5 Qxh5
>>>7.Rh1 Qf5 8.Ne1
>>>2. -+ (-3.09): 1...Rf3 2.exf3 gxf3+ 3.Qxf3 Rxf3 4.Kxf3 Nxg3 5.dxe5 Bxh4 6.Rd4
>>>Qf5+ 7.Kg2 Ne2 8.Ne3 Qxe5 9.Rg4+ Bg5 10.Re1
>>
>>Obviously, then, 1...Bxh4 is better than 1...Rf3.  Right?   : )
>>
>>Bob D.
>
>No
>
>I suspect that the order may be changed if you use longer search.
>
>The line 1...Rf3 2.exf3 gxf3+ 3.Qxf3 Rxf3 4.Kxf3 Nxg3 is forced and
>after it 5.dxe5 is not the best move.
>I expect programs that use singular extensions like Deep Sjeng to find 1...Rf3
>after a long search.
>
>Uri


I think he meant "obviously, since the score is worse for black after Rf3
than it is for Bxh4, then the program thinks it is better."  I don't understand
unless that is "multi-variation output" why the second move was even displayed
since the score is less negative (better for white).



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