[Retros] IBM chess problem

[Николай Белухов]

 http://chessbase.com/puzzle/puzz05d.htm 
- The same puzzle, together with a lot of interesting history (but no solution);
http://chessbase.com/puzzle/
- Many more interesting chess puzzles. Only one or two retroanalytical, in fact, but great fun anyway. 
Best wishes,
Nikolai
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