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Subject: Re: Sometimes they go 'boom'

Author: Dann Corbit

Date: 11:17:44 09/20/02

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On September 20, 2002 at 13:30:09, Gian-Carlo Pascutto wrote:

>[D]4b3/6p1/5p1p/5P1P/3kPK2/1p6/1P2B3/8 b - - 0 1
>
>My engine just managed to lose what looked like a dead-drawn
>endgame against a Crafty clone on ICC. I couldn't understand
>what happened. I still don't know exactly, but it looks like
>some kind of hashing/draw-by-rep/nullmove artifact ;)
>
>But my program doesn't seem to be the only one that
>gets funny on this position:
>
>Analysis by Fritz 7:
>
>80...Bf7!
>  ³  (-0.69)   Depth: 12/20   00:00:00  316kN
>80...Ba4!
>  µ  (-0.72)   Depth: 12/20   00:00:00  550kN
>80...Ba4--
>  ³  (-0.44)   Depth: 13/16   00:00:00  574kN
>80...Ba4
>  ³  (-0.44)   Depth: 13/21   00:00:00  630kN
>80...Bf7!
>  ³  (-0.47)   Depth: 13/21   00:00:01  856kN
>80...Bf7!
>  ³  (-0.63)   Depth: 13/21   00:00:01  989kN
>80...Bf7--
>  ³  (-0.34)   Depth: 14/17   00:00:01  1040kN
>80...Bf7
>  ³  (-0.34)   Depth: 14/19   00:00:01  1089kN
>80...Ba4!
>  ³  (-0.38)   Depth: 14/24   00:00:02  1705kN
>80...Ba4!
>  ³  (-0.66)   Depth: 15/26   00:00:03  3200kN
>80...Bf7!
>  ³  (-0.69)   Depth: 15/26   00:00:05  4577kN, tb=1
>80...Bf7--
>  ³  (-0.41)   Depth: 16/19   00:00:05  4778kN, tb=1
>80...Bf7
>  ³  (-0.41)   Depth: 16/23   00:00:05  4941kN, tb=2
>80...Ba4!
>  ³  (-0.44)   Depth: 16/29   00:00:07  6732kN, tb=4
>80...Ba4!
>  ³  (-0.59)   Depth: 16/29   00:00:08  7756kN, tb=5
>80...Ba4--
>  ³  (-0.31)   Depth: 17/19   00:00:09  8090kN, tb=5
>80...Ba4
>  ³  (-0.31)   Depth: 17/23   00:00:09  8349kN, tb=5
>80...Ba4!
>  ³  (-0.59)   Depth: 18/33   00:00:25  22724kN, tb=94
>80...Ba4!
>  µ  (-0.88)   Depth: 19/36   00:00:53  46904kN, tb=333
>80...Ba4--
>  ³  (-0.59)   Depth: 20/29   00:00:56  49294kN, tb=344
>80...Ba4
>  ³  (-0.59)   Depth: 20/29   00:00:58  50834kN, tb=345
>[etc]
>
>(Pascutto, Gent 20.09.2002)

Chess Tiger growls:
4b3/6p1/5p1p/5P1P/3kPK2/1p6/1P2B3/8 b - - ce 186; acd 19; acs 600; pv Ba4 Bf1
Bc6 Ba6 Bxe4 Bc4 Kxc4 Kxe4 Kc5 Kd3 Kd5 Kc3 Ke4 Kxb3 Kxf5 Kc2 g6 hxg6;|Be8a4



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