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Subject: Re: How many engines select Qb4?

Author: Alessandro Scotti

Date: 13:51:22 11/13/04

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On November 13, 2004 at 14:40:59, Cliff Sears wrote:

>[d] 2r4k/pb2q2P/1p6/3Pp3/4p3/1P2R3/PBrQ2PP/5RK1 w - - 0 28

Kiwi 0.3a on Athlon 700 picks this move fairly quickly, but score increases very
slowly thereafter (a known problem in my engine):

 9/21  -0.29  00:11   3979306  Qb4 Qxb4 Bxe5+ Kxh7 Rh3+ Kg6 Rf6+ Kg5 Rg3+ Kh5
10/21  +0.26  00:31   9170600  Qb4 Qxb4 Bxe5+ Kxh7 Rh3+ Kg6 Rf6+ Kg5 Rg3+ Kh5
11/33  +2.60  02:36  44817012  Qb4 Qxb4 Bxe5+ Kxh7 Rh3+ Kg6 Rf6+ Kg5 Rg3+ Kh5
12/36  +2.83  03:53  66479465  Qb4 Qxb4 Bxe5+ Kxh7 Rh3+ Kg6 Rf6+ Kg5 Rg3+ Kh5
...and growing (the jump to depth 12 is due to some experimental code I forgot
to remove!)

The situation improves if I enable score "quantization":

 9/27  -0.28  00:10   3711367  Qb4 Qxb4 Bxe5+ Kxh7 Rh3+ Kg6 Rf6+ Kg5 Rg3+ Kh5
10/22  +2.84  00:59  17010125  Qb4 Rxg2+ Kxg2 Rc2+ Kh1 Qxb4 Bxe5+ Kxh7 Rh3+ Kg6
11/33  +5.92  03:37  60320645  Qb4 Rxg2+ Kxg2 Rc2+ Kh1 Qxb4 Bxe5+ Kxh7 Rh3+ Kg6
...and growing



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