[Retros] Castling in PG's

CAILLAUDM at aol.com CAILLAUDM at aol.com
Thu Feb 10 14:58:38 EST 2005

Dans un e-mail daté du 10/02/2005 16:35:13 Paris, Madrid,
elkies at math.harvard.edu a écrit :

All of which raises the question: what's the shortest (S)PG
in whose solution one side castles and then plays both King
*and* Rook back to their initial squares? Is this
within the range of your program? Apologies if you've
already posted the answer and I've forgotten...

Not sure this can be in the range of computer analysis before some years...

The shortest in Winchloe database is 8.5 moves :
Francois Perruchaud, France-Echecs, 14.06.2004
SPG 8,5 (12+16) C+

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