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Subject: Re: question about bonus for reducing distance between the kings in craf

Author: Robert Hyatt

Date: 21:17:14 05/28/03

Go up one level in this thread

On May 28, 2003 at 14:59:57, Uri Blass wrote:

>I am too lazy to look at the source code of crafty to try to find what
>formula is used by crafty for reducing the distance between the kings in
>endgames like KQ vs KR to help it to win without tablebases.
>
>what is the formula that is used.
>I decided to try something in movei and first tests suggest that it is slightly
>productive but I want also to know what crafty does.
>
>Uri


Distance is easy:
max(abs(rankwhiteking-rankblackking),abs(filewhiteking-fileblacking)

#define FileDistance(a,b) abs(File(a) - File(b))
#define RankDistance(a,b) abs(Rank(a) - Rank(b))
#define Distance(a,b) Max(FileDistance(a,b),RankDistance(a,b))

I use the three #defines above...

• Re: question about bonus for reducing distance between the kings in craf Omid David Tabibi 04:33:59 05/29/03
  • Re: question about bonus for reducing distance between the kings in craf Robert Hyatt 07:46:41 05/30/03
    • Re: question about bonus for reducing distance between the kings in craf Tim Foden 08:02:05 05/30/03
      • Re: question about bonus for reducing distance between the kings in craf Robert Hyatt 13:28:17 05/30/03
• Re: question about bonus for reducing distance between the kings in craf Uri Blass 22:35:33 05/28/03
  • Re: question about bonus for reducing distance between the kings in craf Robert Hyatt 07:51:02 05/30/03

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