Author: scott farrell
Date: 05:55:45 12/01/03
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On December 01, 2003 at 00:36:11, Peter McKenzie wrote: >On November 30, 2003 at 17:18:19, Georg v. Zimmermann wrote: > >>[b]8/8/8/8/3R1p1k/8/4P3/6K1 w - - 0 1 >> >>white moves pawn, black can not capture en passant. wonderfull, breaks my new >>move generator. >> >>Uri, I think you are the expert on this. Ideas for workarounds ? :-) >> >>But the main reason I am posting is: are there any other situations like the >>above where I can with one move move 2 pieces out of the way of an x-ray attack >>? >> >>Georg > >I didn't bother to try fixing your diagram but I think I can guess what you're >talking about. In which case you might be interested in this link (look at the >last position) to help you test whatever fix you make: > >http://homepages.caverock.net.nz/~peter/perft.htm > Peter, I think your perft calcs for that position is out. That complicated position: r1b1k2r/pp2bppp/5n2/3q4/8/3BPQ2/PBP2PPP/RN2K2R/ b KQkq - 0 0 I verified these against crafty 19.3 plies perft 1 50 2 2159 3 99925 4 4128960 (crafty), chompster(4128961) - the difference is probably draws 5 ... too slow Scott >cheers, >Peter
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