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Subject: Null Move Weirdness

Author: Michael Neish

Date: 18:30:35 12/09/02

Hello,

After adding null move to my program I noticed that it would sometimes play an
obviously bad move that immediately lost material.  In all cases the bad move
was a two-square Pawn push that enabled an en passant capture which won material
either immediately or two ply later.  It seems that en passant captures, being
only temporarily possible, somehow mess up the null move evaluation, although I
donÕt think I understand why exactly.  Adding the condition "if en passant is
possible donÕt do null move" fixes the problem, but adds some nodes to the
search.  However, no one else seems to be doing this, so why is my program any
different?  Ideas?  Thanks.

Mike.

• Re: Null Move Weirdness Robert Hyatt 19:55:36 12/09/02
  • Re: Null Move Weirdness Michael Neish 20:08:59 12/09/02
• Re: Null Move Weirdness Peter McKenzie 18:51:34 12/09/02
  • Re: Null Move Weirdness Michael Neish 19:41:37 12/09/02
    • Re: Null Move Weirdness Peter McKenzie 22:03:20 12/09/02
      • Re: Null Move Weirdness David Rasmussen 23:01:09 12/09/02
        • Re: Null Move Weirdness Steffen Jakob 23:47:07 12/09/02
          • Re: Null Move Weirdness David Rasmussen 00:09:13 12/10/02

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