If you moved the king or both rooks, you can't castle, but you probably knew that. Not really sure what you're saying.
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In this computer game I cannot move the king or rooks. It started as a Sicilian and for a while White's king and rooks were not in the opening that followed the book.
But then I discovered the game would not let me castle: Is there some modification
of the game, like an exercise to solve?