[Retros] shortest proofgames of castling switchback

[Mario Richter]

> change the sequence 12 Re3 Qf3  13 Bh2 Qh3  14 g3  to

> 12 Rg3 Qf3  13 Rg5 Qh5  14 g4,  giving this diagram:

> 

>   r Q B . k . . r  hg-19.0

>   p . p p p p . p

>   n p . . . n p R

>   . b . . b . R q

>   P . . . . B P P

>   . P . P . . . .

>   . . P . P P . .

>   . N . . K . N .  16+16

> 


This still doesn't work, the position can be reached
without black 0-0:

1.a2-a4 g7-g6 2.Ra1-a3 b7-b6 3.Ra3-h3 Bf8-g7 
4.b2-b3 Bg7-d4 5.d2-d3 Ke8-f8 6.Qd1-d2 Kf8-g7 
7.Qd2-h6 Kg7-f6 8.Qh6-f8 Bc8-a6 9.Rh3-h6 Ba6-b5
10.h2-h4 Qd8-c8 11.Rh1-h3 Qc8-b7 12.Rh3-g3 Qb7-f3 
13.Rg3-g5 Qf3-h5 14.g2-g4 Bd4-e5 15.Bf1-g2 Nb8-a6 
16.Qf8-b8 Kf6-g7 17.Bg2-b7 Ng8-f6 18.Bb7-c8 Kg7-f8 
19.Bc1-f4 Kf8-e8


  mario