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Subject: Re: Strange little error for Shredder 9

Author: Andrew Walker

Date: 17:15:57 06/28/05

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On June 28, 2005 at 19:39:30, Jasmine Baer wrote:

>I was examining an engine vs. engine game a little more in depth with Shredder
>9, and Shredder came up with a small little error:
>
>Shredder 9.02 UCI - Shredder 9
>3r2k1/3r1p2/3P3b/ppB2qp1/4pP1p/PP2Q3/3R2PP/5R1K w - - 0 1
>
>Analysis by Shredder 9:
>
>1. = (0.04): 38.g3 hxg3 39.hxg3 f6 40.Rh2 Rh7 41.b4 axb4 42.Bxb4 gxf4 43.gxf4
>Kh8 44.Qb6 Re8 45.d7
>2. = (0.04): 38.g4 hxg3 39.hxg3 f6 40.Rh2 Rh7 41.b4 axb4 42.Bxb4 gxf4 43.gxf4
>Kh8 44.Qb6 Re8 45.d7
>3. = (0.00): 38.Rdf2 gxf4 39.Rxf4 Bxf4 40.Rxf4 Qh5 41.Rxe4 f5 42.Re5 Qd1+ 43.Qg1
>Qxg1+ 44.Kxg1 Rf7 45.Rd5 Rf6
>4. ³ (-0.35): 38.Bb6 gxf4 39.Qf2 Rxd6 40.Bxd8 e3 41.Rxd6 exf2 42.Rd2 h3 43.Rdxf2
>Qd3 44.Bxa5 hxg2+ 45.Rxg2+ Kh7 46.Rgf2 Qxb3 47.Rf3 Qb2
>5. ³ (-0.35): 38.Qf2 gxf4 39.Bb6 Rxd6 40.Bxd8 e3 41.Rxd6 exf2 42.Rd2 h3 43.Rdxf2
>Qd3 44.Bxa5 hxg2+ 45.Rxg2+ Kh7 46.Rgf2 Qxb3 47.Rf3 Qb2
>
>(,  28.06.2005)
>
>In the second variation, White's 38th move is listed as g4, with the
>continuation being 38...hxg3 --> which is impossible if the pawn is moved from
>g2 to g4 on move 38.  The second variation is identical to the first variation
>with the exception of the erroneous 38.g4.
>
>I'm not knocking the engine - I only post this here because Shredder's author
>may find it interesting.


Was en passant capture legal?

Andrew



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