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Subject: Re: Humans still find inevitable attacks better,test position needs analysis

Author: John Merlino

Date: 20:39:50 04/08/04

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On April 08, 2004 at 22:15:00, scott farrell wrote:

>This position arose on ICC Goona vs Chompsterx
>
>here white has an attack coming, with a bishop sac on g6, and black's pieces are
>woefully out of position to defend. While white can poure more pieces in.
>
>The obvious move is g6, but chompster and crafty see black is still winning
>until some depth, where they realise white is winning.
>
>I had cm9000 look at it for a few minutes on a PIII850 and it still says g6, but
>says white is winning by the smallest of margins.
>
>As far as I can see its lost for black.
>
>I am interested in what other engines think.
>
>[d]r4rk1/p2b1ppp/1qn2P2/3pP3/2pP4/b1P1BN1P/P1B2Q2/R4NK1 b - - 0 23
>
>as you can see below crafty takes about 12 plies to see its in trouble, and 14
>plies and overnight to see ne7.
>
>I am unsure if ne7 is a better move

The CM_SKR personality of Chessmaster 9000, on an AMD 1800+, switches from g6 to
Ne7 in about 90 seconds.

Time	Depth	Score	Positions	Moves
0:00	1/3	-1.60	2528		23...g6 24.Rb1 Bb2 25.Ba4
0:00	1/4	-1.71	24215		23...g6 24.Rb1 Qa5 25.Bh6 Qxc3
					26.Bxf8 Rxf8
0:00	1/5	-1.58	74717		23...g6 24.Bh6 Rfb8 25.Ne3 Qa5
0:00	1/6	-1.65	111608		23...g6 24.Qh4 h5 25.Rb1 Bb2 26.Ba4
0:01	1/7	-0.85	202273		23...g6 24.Qh4 Rfb8 25.Ng5 h5 26.e6
					Be8 27.exf7+ Bxf7 28.Nxf7 Kxf7
0:03	1/8	-1.19	518286		23...g6 24.Qh4 Rfb8 25.Ng5 h5 26.e6
					Bxe6 27.Nxe6 Qb2 28.Rc1 fxe6 29.Bxg6

0:07	1/9	0.30	1307872		23...g6 24.Qh4 Rfc8 25.Bxg6 fxg6
					26.f7+ Kxf7 27.Qxh7+ Ke8 28.Qg8+
					Bf8 29.Bh6 Kd8 30.Qxf8+ Kc7
1:03	1/10	0.64	12174030	23...g6 24.Qh4 Rfb8 25.Bxg6 fxg6
					26.f7+ Kxf7 27.Qxh7+ Ke8 28.Qg8+
					Bf8 29.Bh6 Bxh3 30.Qxf8+ Kd7 31.Qd6+
					Kc8 32.Qxd5 Qa6
1:32	1/10	0.26	19539768	23...Ne7 24.Bc1 Qa6 25.Bxa3 Qxa3
					26.fxe7 Qxe7 27.Ne3 Be6 28.Qh4
					Qxh4 29.Nxh4 Rab8 30.Rb1 Rxb1+
					31.Bxb1 Rb8
3:16	1/11	0.60	44098576	23...Ne7 24.Bc1 Bxc1 25.fxe7 Rfe8
					26.Rxc1 h6 27.Ne3 Qa5 28.Rb1 Bc6
					29.Ng4 Rxe7

jm



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