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Rules of Chess: Castling FAQ. Frequent asked questions about castling.[All Comments] [Add Comment or Rating]
Jose Carrillo wrote on Sun, Sep 20, 2009 03:49 PM UTC:
The Excalibur program must have a bug. Castling is legal in that position.

Or you havenèt reset the castling flag or something like that on the Excalibur (I donèt own one, so I donèt know).

BTW, your Be3 moves are illegal in that sequence you provided, Bd3 is the correct move.

Your c1-Bishop (the one that actually can reach e3) is blocked by the d2-Queen.