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Subject: Re: Generalised Board...

Author: Tord Romstad

Date: 05:24:16 03/09/04

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On March 08, 2004 at 16:07:47, Marc Bourzutschky wrote:

>On March 08, 2004 at 13:46:44, Tord Romstad wrote:
>
>>
>>
>>In hexagonal chess, there is an interesting complication caused by the
>>fact that there are actually two kinds of wins:  When a player is mated,
>>the result is 1-0, like in normal chess.  But when the game ends in
>>stalemate, the result is 3/4-1/4.
>>
>>Apart from this, the only difference compared to normal chess is the
>>shape of the board and the movement of the pieces.
>>
>
>The different stalemate status is not hard to implement.  You run the generator
>twice, where on the first run you resolve wins/losses, and on the 2nd run you
>resolve stalemates/draws.

That's good news to me.  :-)

>With 91 squares on the hexagonal board, 5-piece endgames are comparable to
>6-piece endgames on a 8x8 board and will thus be the limit of what is reasonably
>doable today.

But the hexagonal board also has more symmetries compared to a square
board.  Wouldn't this help to reduce the size of the files, and the
amount of computations necessary to produce the tablebases?

>Once you have a move generator and a reasonably efficient way of
>indexing positions building a tablebase generator should be pretty
>straightforward.

Great!  I'll have a look at it.  Thank you very much for your reply!

Tord



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