How to Castle

King can't be under attack

There are other restrictions on castling. You can't castle if your King is under attack. In this diagram, the white Bishop is attacking the black King, so Black can't castle to either side.

Index: How to Castle

1. The King's special move
2. King two squares toward the Rook which hops over the King
3. Castle to either side
4. King and Rook can't have already moved
5. King can't be under attack
6. King can't move through attack
7. King can't end under attack
8. No restrictions on Rooks regarding attacks