[Retros] How many times could a Diagram be repeated during a proofgame?

Noam Elkies elkies at math.harvard.edu
Mon Feb 9 22:49:52 EST 2009

Note that there is a way for two WTM positions A,B to have the property
that for every move from A to some position A' there is a move from B
that reaches the same A', and yet A is drawn while B is lost...


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