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Subject: Re: Move Generator

Author: Russell Reagan

Date: 03:40:08 12/20/02

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On December 20, 2002 at 03:37:09, Gerd Isenberg wrote:

>I do it in IsiChess and i guess a lot of bitboarders too.

Hi Gerd,

What method do you use to accomplish this? I have always had problems when I
tried to generate only legal moves. How do you handle positions with pinned
pieces? And, how do you handle a position like the following?

[D]8/8/8/k1K5/8/8/8/R7 w - - 0 1

When I tried to write a legal move generator I had a problem with these kinds of
positions. Instead of declaring checkmate, the black king would move to a6,
because in the position in the diagram, the square a6 is not attacked, so my
program thought it was safe to move there.

Are there more cases than the two I mentioned?

1. Pinned pieces
2. King moving to an unattacked, but unavailable square.

Russell

• Re: Move Generator John Lowe 20:49:19 12/20/02
  • Re: Move Generator Uri Blass 23:57:48 12/20/02
    • Re: Move Generator John Lowe 00:36:59 12/21/02
      • Re: Move Generator Uri Blass 01:58:20 12/21/02
        • Re: Move Generator John Lowe 04:30:44 12/21/02
• Re: Move Generator Gerd Isenberg 03:59:07 12/20/02

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