[Retros] Fake castling speed record

[Gianchess at aol.com]

Hi Joost -
 
I'm guessing your 5.5-move game goes like this: 1. f4 b6 2. Kf2 Bb7 3. Qe1  
Bxg2 4. Nf3 Bxf1 5. Rxf1 b5 6. Kg1, with the only possible variant being 
1...b5  and then choice of any Black move #5.  

Can it be proved that there is no 4.5 game?  
 
Best,
 
Gianni
 
 
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