Sorry, I actually meant it cannot be done with three stars. Or I cannot find a way to do it. I first capture the horse, then block the bishop, and then I can castle but I get only two stars. Is there any way to get three stars there?
Forget it, I've done it. I thought you cannot castle while the rock was threatened by the enemy bishop. It seems I was wrong, or was I?
@fmmarzoa Bxh3 followed by O-O?
Yes the answer is you first take the knight with your bishop then castle. You are a bit confused with the castling rule : you cannot castle if your king passes or stops by a square where he's in check. But here, the king is free to go.
OK, that's what I realized later. Thanks!
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