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Subject: Re: Strange behaviour of Shredder 8.

Author: John Merlino

Date: 11:21:03 06/16/04

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On June 16, 2004 at 10:48:48, George Tsavdaris wrote:

>
> At the following position Shredder 8(and also 7.04/ 7/ 6.02/ 6.0)
>evaluates that white is better by +0.70 if the move hxg5 is played.
>And it has this move as 2nd best behind Nf4, and after that it also thinks that
>white has the advantage. After forcing hxg5 it evaluates the position correctly
>as -2.55 for black(huge advantage for black).
>
>I have seen this before, but i don't remember if it was Shredder again.
>
>[D]r4rk1/1b3pp1/p5qp/1p1nP1N1/4N2P/3Q4/PP3PP1/R3R1K1 b - - 0 21

For reference, CM_SKR does not have this problem, evaluating hxg5 about -2.0 for
Black instantly:

Time	Depth	Score	Positions	Moves
0:00	1/3	-1.84	1998		21...Nf4 22.Qd2 hxg5 23.hxg5 Bxe4
					24.Qxf4
0:00	1/4	-1.93	6011		21...Nf4 22.Qg3 hxg5 23.hxg5
0:00	1/4	-2.14	7364		21...hxg5 22.hxg5 Rfe8 23.Qh3 Rxe5
0:00	1/5	-1.87	14682		21...hxg5 22.hxg5 Nf4 23.Qg3 Ne2+
					24.Rxe2 Bxe4
0:00	1/6	-2.10	32781		21...hxg5 22.hxg5 Nf4 23.Qg3 Bxe4
					24.Qxf4 Bd3
0:00	1/7	-1.87	97014		21...hxg5 22.hxg5 Nf4 23.Qg3 Ne2+
					24.Rxe2 Bxe4 25.Rd1 Rad8
0:01	1/8	-2.02	242589		21...hxg5 22.hxg5 Nf4 23.Qg3 Bxe4
					24.Qxf4 Bd3 25.Rac1 Rac8
0:03	1/9	-2.21	826356		21...hxg5 22.hxg5 Nc7 23.Qf3 Bxe4
					24.Qxe4 Qxe4 25.Rxe4 Ne6 26.f4
					Rfd8 27.Rc1
0:06	1/10	-2.22	1816028		21...hxg5 22.hxg5 Nc7 23.Qe3 Bxe4
					24.Qxe4 Qxe4 25.Rxe4 Rad8 26.g6
					fxg6 27.e6 Rd2 28.Rc1
0:17	1/11	-2.16	4786886		21...hxg5 22.hxg5 Nc7 23.Qf3 Bxe4
					24.Rxe4 Ne6 25.Rg4 Rfd8 26.Rc1
					Nxg5 27.Qe3
0:46	1/12	-2.20	12687771	21...hxg5 22.hxg5 Nb4 23.Qd2 Bxe4
					24.Qxb4 Bd3 25.Rad1 Rad8 26.Qc3
					Rd7 27.Re3 Rfd8
2:12	1/13	-2.28	37751017	21...hxg5 22.hxg5 Nc7 23.Qf3 Ne6
					24.Nf6+ gxf6 25.Qxb7 Nxg5 26.Kf1
					Qh5 27.f4 Ne6 28.exf6 Nxf4

jm



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