Author: Christophe Theron
Date: 21:28:55 12/24/03
Go up one level in this thread
On December 24, 2003 at 13:54:57, Dann Corbit wrote:
>On December 24, 2003 at 10:40:19, Christophe Theron wrote:
>[snip]
>>Please explain how storing anything that has to do with 50 moves rules or
>>position repetition in the compressed would help avoiding considering the whole
>>game history.
>>
>>In any case you cannot avoid, if you want to deal with 50 moves rules or
>>repetition detection, to have the whole game history available.
>>
>>So storing anything about these in the compressed position is just a waste of
>>space.
>
>50 move rule needs no game history. It needs only its current state. You don't
>care what the reversible moves were. It's totally irrelevant.
It would be fine if it was of any use. But if you want to be actually able to
comply with the standard rules of chess it is not enough, because the 50 moves
rule is not the only rule that requires you to store the last plies of the game.
>The 3 move repetition rule does not need the whole game history. It needs the
>whole game history since the last non-reversible move.
So you might need in the worst case to store the last 100 plies in order to
comply to the 50 moves AND threefold repetition rules.
So, it's a waste of time to try to store anything related to 50 moves rule or
threefold repetition in the compacted position.
That was my point...
Christophe
>Like I said, this data is implicit in the game play itself. The point I was
>trying to make is that you can have one position that is identical by looking at
>the board [and even knowing the castling rights and e.p. status], but really it
>is 100*3 different positions.
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