[Retros] Invisible castling SPG in 7.5

[CAILLAUDM at aol.com]

Dans un e-mail daté du 11/02/2005 17:22:22 Europe de l'Ouest,  
andrew at anselan.com a écrit :

Here is  a C+ promotion-free invisible castling position in 7.5  moves:

#############################################
## Euclide  0.92, ©2000-2002 Étienne Dupuis  ##
#############################################

Problème analysé  :
rnb1kbnr/ppp1pppp/3p4/8/8/4PP2/PPPP2PP/RN2K2RwKQkq-
15

Solution #1  :
---------------------------------------------------------------------
Blah  blah blah
4. 0-0
Blah blah blah

Verdict :
Solution unique
12.64 secondes  

Cheers,
Andrew.




Excellent!!
BTW, I think in the field of SPG records we should distinguish realizations  
with or without apparent promotee.
For example, taking the famous 100-dollars thema in helpmate (double  
Excelsior with promotion to Knight in a single-line h#5), there exist some  settings 
with promoted force; but no helpmate composer would consider them as  "the 
real thing", only interesting experimental works.
SPG is a younger genre than helpmate, so maybe this is a reason to be more  
permissive; SPGs with promoted force are quite common and few people object to  
them (some people do nevertheless). But in record field, there should be a 
place  for "single box" presentations...
(in the invisible castling case, this debate has now no meaning with  
Andrew's ingenious realization).
 
Best,
 Michel 
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