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Subject: Re: Endgame databases in 12 x 12 chess

Author: Vincent Diepeveen

Date: 16:20:47 09/20/00

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On September 20, 2000 at 18:54:19, Bruce Moreland wrote:

>On September 20, 2000 at 17:00:09, José de Jesús García Ruvalcaba wrote:
>
>>Hi Bruce,
>>	did you design your own indexing scheme for your tablebases?
>>José.
>
>Yes, it's just one piece constrained in a triangle, and the others allowed to be
>anywhere.  My files are smaller than Edwards' and larger than Nalimov's.  I had
>a bunch of dependencies upon "8" and "64" in the code, and a few precomputed
>tables, but I just generalized things a bit and it seems to work.
>
>I wonder how far I could get with 6 x 6 chess?  Powers of 36 are quite a bit
>better than powers of 64.
>
>bruce

chess on a 12x12 is very simple actually if you both only start with a
king.

on a 6x6 with each 2 pieces it's real easy too.

however, i have already huge problems with draughts. it has theoretical
just 50 squares, and at most 2 different pieces, so constructing egtbs
for those considering the reduction should be fairly easy, yet constructing
6 men there is already hard, where there are some REAL interesting

5 against 2 cases, so actually you only get close to the human many
hundreds of moves studies when you get to 7 men!



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