[Retros] shortest proofgames of castling switchback

Joost de Heer joost at sanguis.xs4all.nl
Sat Jul 14 04:47:18 EDT 2007

> Btw., does an SPG exist, where both sides did an invisible castling?

Yes, it's even in the FIDE album.

A. Frolkin
Die Schwalbe 1990
2nd prize
SPG 19.0


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