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Subject: Re: Can any engine with book off do a better job than Shredder at diagnosing

Author: Dann Corbit

Date: 11:30:33 04/19/04

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On April 19, 2004 at 14:09:41, John Merlino wrote:

>On April 19, 2004 at 13:49:12, Dann Corbit wrote:
>
>>... this position from the Evans Gambit?  Shredder has reduced the score to 0.13
>>pawns and most engines I tried were much farther away from the true value.
>>
>>On the other hand, all the engines I did try eventually start a slow march
>>downward with the score.  Some are wildly optimistic (thinking at first that
>>they are two pawns ahead).
>>
>>[D]r1bqk1nr/pppp1ppp/2n5/b7/2BpP3/2P2N2/P4PPP/RNBQ1RK1 b kq - am dxc3; bm Nge7;
>>
>
>Here is CM_SKR's output on an AMD 2500+:
>
>Time	Depth	Score	Positions	Moves
>0:00	1/3	-1.00	1730		1...dxc3 2.Qd5 Qe7 3.Na3
>0:00	1/4	-1.22	7395		1...dxc3 2.Be3 d6 3.Na3 Nf6
>0:00	1/5	-0.31	24166		1...dxc3 2.Qb3 Nf6 3.Bxf7+ Kf8
>					4.Ng5 Ne5
>0:00	1/6	-0.19	66819		1...dxc3 2.Qb3 d6 3.Nxc3 Bxc3 4.Qxc3
>					Nf6 5.Bg5 O-O
>0:00	1/6	-0.24	79779		1...Nf6 2.e5 Ne4 3.Qb3 O-O 4.cxd4
>					d6
>0:01	1/7	-0.20	209149		1...Nf6 2.e5 Ne4 3.cxd4 d5 4.exd6ep
>					O-O
>0:01	1/7	-0.35	329351		1...dxc3 2.Qb3 Nf6 3.Bxf7+ Kf8
>					4.Ng5 h6 5.Ba3+ d6 6.Bg6
>0:03	1/8	-0.28	750696		1...dxc3 2.Qb3 Qe7 3.Nxc3 Nf6 4.e5
>					Nxe5 5.Nxe5 Qxe5 6.Bxf7+ Kd8 7.Bb2
>0:08	1/9	-0.08	2056551		1...dxc3 2.Qb3 Qf6 3.Bg5 Qg6 4.Nxc3
>					Nf6 5.e5 Nxe5 6.Nxe5 Qxg5 7.Nxf7
>0:26	1/10	-0.08	6240835		1...dxc3 2.Qb3 Qf6 3.Bg5 Qg6 4.Nxc3
>					Nf6 5.e5 Nxe5 6.Nxe5 Qxg5 7.Nxf7
>0:38	1/10	-0.23	8997341		1...Nf6 2.e5 Ne4 3.Qe1 Nxc3 4.Bg5
>					Nxb1 5.Qxb1 Ne7 6.Qb3
>1:17	1/11	-0.06	18550374	1...Nf6 2.e5 Ne4 3.Qe1 Nxc3 4.Bg5
>					Nxb1 5.Qxb1 Ne7 6.Qb3 d5 7.exd6ep
>					Qxd6
>3:56	1/12	-0.20	57431817	1...Nf6 2.e5 Ne4 3.Qe1 Nxc3 4.Bg5
>					Nxb1 5.Qxb1 Ne7 6.Nxd4 d5 7.exd6ep
>					Qxd6
>8:56	1/13	-0.04	132545443	1...Nf6 2.e5 Ne4 3.Qe1 Nc5 4.Bg5
>					Ne7 5.Nxd4 h6 6.Bxe7 Qxe7 7.Nf5 Qg5
>
>(Remember that, in the CM GUI, negative evals mean that Black is ahead).

That is a very impressive result.  None of the engines I tried could find it
even after a very long search.

• Re: Can any engine with book off do a better job than Shredder at diagnosing John Merlino 12:02:42 04/19/04

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