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Subject: KD's 20-byte thing

Author: Bruce Moreland

Date: 01:22:28 08/14/99

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On August 14, 1999 at 01:25:50, KarinsDad wrote:

>I wrote a white paper on compressing a random legal position into 20 bytes.
>Unfortunately, I have not been successful on that. Until I am, that white paper
>stays put (actually, I have basically convinced myself that it cannot be done,
>so I doubt I will ever publish that paper).

It can be done if and only if there are <= 2^160 legal positions in chess.  The
technique would involve assigning each legal position a unique number and
storing that number.  You can't do any better than this.

Assuming that there are more than 2^160 legal positions, you still may be able
to store typical positions in fewer than 160 bits, but only at the cost of
storing less common positions in more than 160 bits.

bruce



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