Have you taken into account that the squares your king has to pass through are attacked by an opposing piece? I'm sure that you have but I have to ask the question before someone else has. I have had no problems but 960 does give different results in castling.
Castling in chess960
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Why is it so hard for me to castle in chess 960 ? I have done clicking on the king then the rook and also picking up the king & moving it onto the rook or the square it should land on after castling; sometimes it has worked but many times it has not.
Has anyone else experienced this ?