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Subject: Re: Interesting position -- how to take back?

Author: Andrew Williams

Date: 01:56:37 06/21/02

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On June 20, 2002 at 19:43:43, John Merlino wrote:

>This position is from one of the games that Ali Mirafzali posted between CM8000
>and a Master named Kamberi, rated 2350.
>
>[D]r1b1r1k1/1p3p2/2p1nq1b/2P1p1pp/1PB1PB2/2N1QN1P/3R1PP1/1R4K1 b - - 0 26
>
>Black has four ways to take back. What does your program say is the best?
>
>CM9000, on a PIII-600, prefers Nxf4. Kamberi played exf4, which CM thinks is the
>worst of the four possibilities.
>
>Time Depth Score Positions Moves
>0:00 1/3 0.69 1101  26...exf4 27.Qd3 Rd8
>0:00 1/4 0.47 2050  26...exf4 27.Qd3 Rd8 28.Qc2 Bg7
>0:00 1/5 0.79 8509  26...exf4 27.Qd3 Rd8 28.Qc2 Bg7
>     29.e5 Rxd2 30.Qxd2
>0:00 1/5 0.71 12456  26...gxf4 27.Qd3 Rd8 28.Qc2 Nd4
>     29.Nxd4 exd4
>0:00 1/6 0.54 33767  26...gxf4 27.Qd3 Bg7 28.Re1 Nd4
>     29.Nxd4 exd4
>0:01 1/7 0.56 87600  26...gxf4 27.Qd3 Bg7 28.Re1 Nd4
>     29.Nxd4 exd4 30.Ne2
>0:03 1/8 0.53 187667  26...gxf4 27.Qd3 Bg7 28.Rbd1 Qe7
>     29.Ne2 Rd8 30.Qc2
>0:07 1/8 0.39 434519  26...Qxf4 27.Qxf4 exf4 28.Rd3 Bg7
>     29.Bxe6 Bxe6 30.Nxg5 Bc4
>0:11 1/8 0.33 691576  26...Nxf4 27.Rd6 Ne6 28.Qe2 Bf8
>     29.Rdd1 Nd4 30.Nxd4 exd4
>0:32 1/9 0.00 2123702  26...Nxf4 27.Rd6 Be6 28.Bxe6 Rxe6
>     29.Rxe6 Qxe6 30.Ne2 Qa2 31.Nc3 Qe6
>0:54 1/10 0.08 3732873  26...Nxf4 27.Rd6 Be6 28.Bxe6 Rxe6
>     29.Rxe6 Qxe6 30.Ne2 Nxe2+ 31.Qxe2
>     Ra2 32.Qd3 g4
>3:02 2/11 -0.13 13075813 26...Nxf4 27.Ne1 g4 28.Rd6 Ne6
>     29.Qg3 Bf8 30.Bxe6 Bxe6 31.hxg4
>     Bxd6 32.gxh5+ Qg7 33.Qxg7+ Kxg7
>     34.cxd6
>
>jm

My program says this after a 15 minute search:

15>    67   413  69860615   1...exf4 2.Qd3 Rd8 3.Qc2 Rxd2 4.Nxd2 g4
                            5.Qd3 f3 6.g3 gxh3 7.Nxf3
15=    71   745 117526754   1...exf4 2.Qd3 Rd8 3.Qc2 Rxd2 4.Qxd2 g4
                            5.Bxe6 Bxe6 6.hxg4 hxg4 7.Qd4 Qe7 8.Nh2 Bg7
16>    71   820 129925695   1...exf4 2.Qd3 Rd8 3.Qc2 Rxd2 4.Qxd2 g4
                            5.Bxe6 Bxe6 6.hxg4 hxg4 7.Qd4 Qe7 8.Nh2 Bg7

This indicates that my program thinks that black is winning by +0.71

This on a busy Athlon 1200, if it's of any interest.

Andrew



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