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Subject: Fill & Floodfill (for Gerd)

Author: Bas Hamstra

Date: 13:13:21 12/23/02

Gerd,

Those fill routines are really neat. I have a few tiny enhancements and am
working on more. How about this:

// determine where white pawns can go safely, with a floodfill up:
WSafePath = FFillUp(WPawns, ~(AllPawns|BDominated) );

// now we can calc "pawn-defendable" more accurately:
WDefendable = ((WPawnAttacksRight >> 16) & WSafePath) << 7     |
              ((WPawnAttacksLeft >> 16) & WSafePath) << 9      ;

// to be used in backward pawns:
WBackWard = ((~AllPawns & BDominated) >> 8) & WPawns & ~WDefendable;

Best regards,
Bas.

Re: Fill & Floodfill (for Gerd) Gerd Isenberg 16:07:51 12/23/02
- Re: Fill & Floodfill (for Gerd) Bas Hamstra 16:33:50 12/23/02
  - Re: Fill & Floodfill (for Gerd) Russell Reagan 20:32:14 12/23/02
    - Re: Fill & Floodfill (for Gerd) Bas Hamstra 09:07:14 12/24/02
  - WHAT is the definition of a backward pawn? Bas Hamstra 17:31:46 12/23/02
    - Re: WHAT is the definition of a backward pawn? Gerd Isenberg 04:35:03 12/24/02
      - Re: WHAT is the definition of a backward pawn? Bas Hamstra 10:32:44 12/24/02
    - Re: WHAT is the definition of a backward pawn? Bruce Moreland 00:40:24 12/24/02
      - Re: WHAT is the definition of a backward pawn? Vincent Diepeveen 16:38:27 12/24/02
        
        Re: WHAT is the definition of a backward pawn? Bruce Moreland 09:22:05 12/25/02
        
        Re: WHAT is the definition of a backward pawn? Vincent Diepeveen 12:13:10 12/26/02
        
        Re: WHAT is the definition of a backward pawn? Gerd Isenberg 03:21:23 12/25/02
        
        Re: WHAT is the definition of a backward pawn? Vincent Diepeveen 12:05:19 12/26/02
        
        Re: WHAT is the definition of a backward pawn? Miguel A. Ballicora 14:18:42 12/27/02
        
        Re: WHAT is the definition of a backward pawn? Gerd Isenberg 02:49:28 12/27/02
        
        Re: WHAT is the definition of a backward pawn? Vincent Diepeveen 08:44:49 12/27/02
        
        Re: WHAT is the definition of a backward pawn? Gerd Isenberg 11:12:16 12/27/02
        
        Re: WHAT is the definition of a backward pawn? Bruce Moreland 09:34:36 12/25/02
    - Re: WHAT is the definition of a backward pawn? Robert Hyatt 21:20:07 12/23/02
      - Re: WHAT is the definition of a backward pawn? Bas Hamstra 11:00:22 12/24/02
        
        Re: WHAT is the definition of a backward pawn? Robert Hyatt 12:17:06 12/24/02
        
        Re: WHAT is the definition of a backward pawn? Russell Reagan 12:17:02 12/24/02
        
        Re: WHAT is the definition of a backward pawn? Bas Hamstra 13:59:50 12/24/02
    - Re: WHAT is the definition of a backward pawn? Miguel A. Ballicora 20:14:45 12/23/02
      - Re: WHAT is the definition of a backward pawn? Robert Hyatt 21:22:30 12/23/02
  - Re: Fill & Floodfill (for Gerd) Gerd Isenberg 17:23:24 12/23/02

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