At 07:07 AM 9/17/2019, Brian Sheppard via Computer-go wrote:
>I remember a scheme (from Dave Dyer, IIRC) that indexed positions based on the 
>points on which the 20th, 40th, 60th,... moves were made. IIRC it was nearly a 
>unique key for pro positions.

Correct, but it's only useful for game recognition, not for any
other kind of search.   It was intended for the pre-digital "what
game is that" problem for printed games.

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