[Retros] Ortho-reconstructions

[Николай Белухов]

 Dear retro-friends,
I wrote one short paper on ortho-reconstruction 
problems and related genres; it is available to download on the links at the end of this message. 
An ortho-reconstruction 
is a problem where you are asked to play forward from a given position 
so that you reach the same position, but with the other side on the 
move; this may seem easy at first, but in reality there are quite 
complex ortho-reconstructions (a shortest solution of 343 single moves 
sure counts as complex, doesn't it?). Besides, the genre is not only 
interesting "for its own sake" - but more about this in the paper.
http://chessproblem.net/viewtopic.php?f=13&t=385
or
https://docs.google.com/fileview?id=0B84M-EsbAvopYjZiODIzMTUtM2VkZS00ZWE1LTljZmEtNGJiYzliNmYwZDZi&hl=en
Best
 wishes,
Nikolai
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