[Retros] shortest proofgames of castling switchback

Joost de Heer joost at sanguis.xs4all.nl
Wed Jul 18 01:37:21 EDT 2007

Noam Elkies wrote:

> Any hope of computer checking for that one?

C+ for the first 17 moves. But white just has too many free moves, I
don't think it can be fully computertested.


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