Zalmen Kornin
Die Schwalbe, Heft 192, 2001

13+14. (Forced castling) Mate in 2 moves a) diagram b) -bQb1
"Forced castling": If castling is legal, it must be played.
(The stipulation as published in the magazine, translated to english)
***** OR ***** it could work as well as just
#2 (a) diagram; (b) without the Qb1
Solution: (when the point in my reazoning becomes clear) : in one of the tries, Black is already, say - practically - forced to castle, otherwise the Try would not be refuted, it would be a second solution itself! - So, if Black castled in the TRY (therefore turning the move to a VIRTUAL possibility) - Why he would not be able to castle also in the actual solution and in every other propicious moment without the introduction of a FORCED condition ?!
...a detailed solution coming soon ... (edited August 4th 2010) ... ... Well, in the end, I came to know that very few solvers were able to send the correct solution, so it was very pleasant for me anyway
