[Retros] invisible castling / capture free fake castling - the queen side case

[raosorio at fibertel.com.ar]

Hi friends,

Olli Heimo wrote,

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r1b2bnr/pp1ppppp/1kp5/8/4PB2/Q2P3N/PPPnBPPP/R3KNqR 


> SPG 12.5 



> Intended solution: 



> 1.e4 Nc6 2.Qf3 Ne5 3.Qa3 c6 4.d3 Qb6 5.Bf4 Kd8 6.Nd2 Kc7 



> 7.0-0-0 Qe3 8.Nh3 Qe1 9.Be2 Qg1 10.Nf1 Kb6 11.Kd2 Nc4+ 



> 12.Ke1 Nd2 13.Ra1 

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very nice, the capture free rendition of invisible castling on the queen side.

I found the following for the fake castling task,


rn2kbnr/p2pp1pp/1pp4B/5p2/4NP2/2PP3b/PPQ1PqPP/2KR1BNR
9.5 moves    C+

1. Pd2-d3   Pc7-c6     2. Fc1-h6   Dd8-b6     3. Pf2-f4   Db6-f2    
 4. Re1-d2   Pb7-b6     5. Cb1-c3   Fc8-a6     6. Cc3-e4   Fa6-c4    
 7. Pc2-c3   Fc4-e6     8. Dd1-c2   Fe6-h3     9. Ta1-d1   Pf7-f5    
10. Rd2-c1   

9.5 moves. It's suspicious the fact that this is shorter than the previously shown O-O case (?)

Best,
Roberto