How do I castle?

Simply move (as in any other chess programs) your king TWO squares to the side you want to castle.

The following conditions must be true before you can castle:

1. your king and rook have never been moved
2. your king is not under attack (in check)
3. your king is not passing through or arriving upon a square controlled by the opponent and
4. all of the squares between the king and rook are vacant

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