[Retros] Castling in PG's

[CAILLAUDM at aol.com]

You need  at least 7 moves (3 to clear castling row, then castling, then 3 to 
go back),  and it's almost certain you need another move. So it seems that 
7.5 is the  theoretical minimum, and this can be  reached:

rnbqkbnr/ppppp1pp/8/8/2B1P3/3r1P2/PPPP2PP/RNBQK2R
SPG 7.5  (C+)

Joost
Of course, admitting promoted piece on the board makes it  easier.
This can be considered as a version of :
Tibor Szabo feenschach 1984 
rnbqk1nr/pppp2pp/4p3/8/P1B1P3/5P2/P1PP2PP/RNbQK2R
SPG 10.0 14+15 C+
with same 6.5 first moves, and where composer added moves to make the  
promotee disappear (Ceriani-Frolkin)
 
This mechanism was also used to show the only doubling so far of the idea  :
Andrei Frolkin 2nd Prize Die Schwalbe 1990
r1bnk2r/pp1p2pp/2n2p2/2bQp3/4Pr2/5PR1/PP1P2PP/RNB1K2R
SPG 19.0 14+15 C+
 

I have found a  shorter version of Francois’ excellent  composition: 
r3k2r/Qppp2pp/4pp1n/2P5/8/b7/PP1PPPPP/RNB1KBNR 
SPG 8.0 (16+12)  C+ 
wPc5 forces the order  of the Black kingside moves, and also luckily blocks 
pernicious cooks whereby  bK wanders to d6 & back. 
Cheers, 
Andrew.
Well seen,  Andrew!
New record for "without promotee"  presentation
 
Michel




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