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Subject: Re: WAC 141 blowup

Author: Uri Blass

Date: 00:58:46 09/01/04

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On September 01, 2004 at 03:30:42, Chris Welty wrote:

>On September 01, 2004 at 00:51:47, Stuart Cracraft wrote:
>
>>I know this is a long shot throwing this out there without much more
>>info, but perhaps I'll get lucky and someone has seen this before.
>>It's appeared on this bulletin board about 6 years ago.
>>
>>[D]4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - bm Qxf4; id
>>"WAC.141";
>>
>>without mate threat code
>
>>10/46  g2f1 471.92 -825 92873175 g2f1 e8b8 h1g1 f4e6 h4h5
>>11/46> g2f1 666.85 -575 133140320 g2f1 e8b8 h1g1 f4e6 h4h5
>
>Perhaps the problem's not in the mate threat extension but somewhere else? When
>Altamax sees Qxf4 the PV is only 10 ply long:
>6 347 0 196349 Qxf4 Bxf4 Rxh5 gxh5 Rxh5 Bh6 Rxh6 Qg3+ Kxg3 Kf8  196kn /2.80s =
>70.2kn/s

Does it use null move pruning?

I use null move pruning and evaluation based pruning so I need bigger depth to
see Qxf4.

Uri



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