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Subject: Re: the reason why Anaconda canīt draw against Hydra...

Author: John Merlino

Date: 08:57:47 03/01/05

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On March 01, 2005 at 08:47:11, Thomas Lagershausen wrote:

>[D]2r2r1k/1bqnb1pp/p2pB3/1p1Pp3/2n5/5NNP/PP3PP1/R1BQR1K1 b - - 4 20
>
>...is the lack of positional knowledge. This counts for most of curent
>chessprograms.
>
>In the last round of Paderborn Anaconda reaches this position with the black
>pieces against Hydra and lost without any real resistance.
>
>But it is not difficult to see that black has to play against the weak pawn on
>d5 to get enough counterplay. So, the sacrifice of the exchange by 20...Nc5 or
>20...Nf6 give black the chance to free his game and equalize the position.
>
>Please notice that my intention is to help the programers and not to show how
>weak chessprograms are playing chess.
>
>Have fun and improve your chessprograms.
>
>TL

CM9_SKR on a P4-2.4 chooses Nf6 after 0:11. Note that it does NOT expect White
to reply by taking the c8 Rook, but rather to muster its forces with Ng5
(earlier PVs suggest Qd3):

Time	Depth	Score	Positions	Moves
0:00	1/5	0.49	22586		20...Ncb6 21.Ng5 Bxg5 22.Bxg5 Qc2
					23.Re2
0:00	1/5	0.19	28423		20...b4 21.b3 Na3 22.Bxa3 bxa3
					23.Rc1 Qxc1 24.Qxc1 Rxc1 25.Rxc1
0:00	1/5	0.13	47661		20...Rce8 21.b3 Ncb6 22.Ba3 Nc5
0:00	1/6	0.30	67115		20...Rce8 21.b3 Nc5 22.bxc4 Nxe6
					23.dxe6 Bxf3 24.gxf3 Qxc4
0:01	1/7	0.30	163074		20...Rce8 21.b3 Nc5 22.bxc4 Nxe6
					23.dxe6 Bxf3 24.gxf3 Qxc4
0:03	1/8	0.30	407837		20...Rce8 21.b3 Nc5 22.bxc4 Nxe6
					23.dxe6 Bxf3 24.gxf3 Qxc4
0:07	1/8	0.26	994412		20...Ncb6 21.Ne4 Qc2 22.Bg5 Bxg5
					23.Nfxg5 Qxb2 24.Nf7+ Rxf7 25.Bxf7
0:11	1/8	0.10	1548071		20...Nf6 21.Qd3 Qa5 22.a3 Nxd5
					23.Bxc8 Rxc8 24.Qf5
0:21	1/9	0.17	3028171		20...Nf6 21.Qd3 Rce8 22.Ng5 Bd8
					23.b3 Nb6 24.Be3 Nbxd5 25.Nxh7
					Nxh7 26.Bxd5 Bxd5 27.Qxd5
0:56	2/10	0.08	8001492		20...Nf6 21.Qd3 Nb6 22.Be3 Qc4
					23.Qxc4 Nxc4 24.Bxc8 Rxc8 25.Nf5
					Nxd5 26.Nxe7 Nxe7
2:08	2/11	0.24	18992586	20...Nf6 21.Qd3 Nb6 22.Bxc8 Rxc8
					23.Bg5 Qc2 24.Qxc2 Rxc2 25.Rac1
					Rxc1 26.Rxc1 Bxd5
6:14	2/12	0.11	57317517	20...Nf6 21.Ng5 Nb6 22.Bd2 Bxd5
					23.Bxd5 Nfxd5 24.Ne6 Qc4 25.Re4
					Qc6 26.Rc1 Nc4 27.Nxf8 Rxf8

jm



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