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Subject: Re: EGTB generation with 1 bit per position?

Author: Tony Werten

Date: 23:57:04 03/25/03

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On March 25, 2003 at 17:30:52, martin fierz wrote:

>i computed some checkers endgame databases with retrograde analysis based on the
>paper by the chinook team. for larger databases, i have a memory size problem;
>specially as win32 only allows a process to use 2GB.
>i once heard that it was possible to compute a win/loss/draw endgame database
>using only 1 bit per position as opposed to 2 bits as i was using up to now (and
>like in the chinook paper).

The only way I know of doing this is make an assumption about the position. If
on side has an advantage you could use win/no win. With "no win" you don't care
about wether it's a draw or a loss. It's the wrong path anyway. ( Or the right,
depends on whose move it is )

The only thing you need is a "decisionmaker" when the weaker side has 2 "no
loss" moves to decide wich is best. ( ie 1 might be a draw and 1 a win )

Tony

>
>does someone here know more about this? i'm looking either for an explanation
>for dummies, or for a reference to a paper.
>
>thanks in advance
>  martin



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