The Rules
Castling
Two pieces, one move
The idea
Castling is the only move where two pieces move at once. The king slides two squares toward a rook, and that rook jumps over the king to the square right next to him. It gets the king to safety AND activates a rook in one move. Conditions: neither piece has moved, the king isn't in check, and the king doesn't pass through or land on an attacked square.
Example 1 of 1
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Both sides ready to castle. The squares between king and rook are clear on both wings.
2
Try it
Your move
Castle kingside (also called short castling, written O-O).
8
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a1
b
c
d
e
f
g
h