[Retros] shortest proofgames of castling switchback

[CAILLAUDM at aol.com]

Hello,
 
Nor Natch or Euclide can test this one (maybe Mario?), but it is sure  option 
19.b3 cannot be maintained because of intervertion 13.b3 19.Nh3.  So 19.Kf1 
is the only option to test...
 
Best,
 Michel
 
Dans un e-mail daté du 18/07/2007 16:50:49 Paris, Madrid,  
elkies at math.harvard.edu a écrit :


So  this row of H.Onoda's table is no longer "vacant".  Still, perhaps
I  gave up too late on the 19.0 move version: with 7 Bf4 no longer used
for  Bh2,g3 etc.  we can try to put this Bishop on g5 to stop ...Kf6
(and  while I'm at it also to help restrict the bK's wife):

1 a4  g6  2 Ra3 Bg7  3 Rh3 Be5  4 d3 Nf6  5 Qd2 0-0  6 Qh6  Kh8
7 Bg5 Rg8  8 Qf8 b6  9 Rh6 Ba6  10 h4 Qc8   11 Rh3 Qb7  12 Re3 Qf3
13 Nh3 Qh5  14 g4 Bb5  15 Bg2  Na6  16 Qb8 Kg7  17 Bb7 Rh8  18 Bc8 Kf8
19 b3  Ke8

r Q B . k . . r  hg-19.0
p . p p p p .  p
n p . . . n p R
. b . . b . B q
P . . . . . P  P
. P . P R . . N
. . P . P P . .
. N . . K . .  .  16+16

NDE 18.vii.2007

I also retain the option of  changing 19 b3 to 19 Kf1.







   
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