[Retros] Invisible castling SPG in 7.5

[andrew buchanan]

Here is a C+ promotion-free invisible castling position in 7.5 moves:

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## Euclide 0.92, ©2000-2002 Étienne Dupuis ##
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Problème analysé :
	rnb1kbnr/ppp1pppp/3p4/8/8/4PP2/PPPP2PP/RN2K2RwKQkq-
	15

Solution #1 :
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Blah blah blah
4. 0-0
Blah blah blah

Verdict :
	Solution unique
	12.64 secondes 

Cheers,
Andrew.