[Retros] Fastest fake Castling / double Rochadeparadoxon

[raosorio at fibertel.com.ar]

Hi friends,

On sept 24 Nicolas Dupont wrote,
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Some years ago, I constructed a game showing fake castlings for both 
sides (Phénix 2002-2003). The game goes as follows: 

1.g3 g6 2.Fh3 Fh6 3.Fé6 Fé3 4.f×é3 f×é6 5.Rf2 Rf7 6.Df1 Df8 7.Dg2 Dh6 
8.Dé4 Dh3 9.Cf3 Ch6 10.Tf1 Tf8 11.Rg1 Rg8 

Is it possible to show this same double trick quicker ? Constructing 
such a pg but with long castlings would be interesting. 

The "opposite" question of the "invisible" castling is also interesting. 

Formal definition: On the position diagram a King and some Rook stand 
on their initial squares, but a castling involving those pieces occurs 
during the game. 
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This has already been shown by Andrey Frolkin (double  Rochadeparadoxon, P0000185,
7053 Die Schwalbe 124 08/1990, H14 FIDE Album 1989-1991 1997, also published as a
"Selected Problem" in Orbit),

1. e4 c5 2. Ld3 c4 3. Se2 cxd3 4. 0-0 dxe2 5. c4 e1=T 6. c5 Te3 7. c6 Tf3 8. c7 Tf4 9. f3 e5 10. Kf2 Lc5+ 11. Ke1 Se7 12. Th1 0-0 13. cxd8=T Sec6 14. Te8 Sd8 15. Te6 Sbc6 16. Tg6 f6 17. Tg3 Kf7 18. Db3+ Ke8 19. Dd5 Th8

As far as I know, the equivalent  task on the queen side is still pending. I would add to the
Nicolas' definition that it is not "some" rook, but actually the rook involved in castling.

Best,
Roberto