Author: Tony Werten
Date: 04:24:15 01/07/03
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On January 07, 2003 at 07:16:59, Dieter Buerssner wrote: >On January 07, 2003 at 06:45:03, Tony Werten wrote: > >>On January 07, 2003 at 05:49:28, Uri Blass wrote: >>>What is your definition of x-ray attack >>> >>>Here is a diagram >>> >>>[D]r1b1qb1r/pppp2pp/2nn4/6B1/3p2Q1/Pk3PP1/4N2P/RN2K2R b KQ - 0 13 >>> >>>What is x-ray attacked by what? >> >>Nothing, but with > >Did you consider side to move (which is black here)? My evaluation considers a >x-ray attack to a3 by Bf8 through Nd6, but not to g4 by Bc8 through the pawn. I think most programs don't consider Bf8 having an xray on a3 because the blocking piece (Nd6) doesn't have an attack on a3. It's more a "hidden attack". Worth considering, but it doesn't changing the outcome of a pieceswap on a3. ( when considering only 1 square) For a global pieceswap routine it could, but that seems to be a bit too complicated for anyone to try. ( in chess) Tony > >Regards, >Dieter
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