Definition:Chess/Rules/Castling

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Definition

Castling is a special move where, in one move, the king moves two squares towards a rook, and the rook jumps over the king and lands on the next square the other side of the king.

This can only be done if:

$(1): \quad$ The king and rook have not been moved yet.
$(2): \quad$ The squares in between the king and rook are empty.
$(3): \quad$ The king is not in check, and neither of the $2$ squares it moves through are under attack.


Position of king and rook before castling
abcdefgh
8
Chessboard-480.png
a8 black rook
e8 black king
e1 white king
h1 white rook
8
77
66
55
44
33
22
11
abcdefgh


Position of king and rook after castling
abcdefgh
8
Chessboard-480.png
c8 black king
d8 black rook
f1 white rook
g1 white king
8
77
66
55
44
33
22
11
abcdefgh