Rules ::
What is castling?
A "special" move was made in order to help the
protection of the King.
Castling can only be made when:
There are no pieces in between the Rook and the King.
The King has not yet moved.
The Rook that is castling with the King has never moved.
The King is not in check
The King will NOT be crossing squares that are attacked by
opponent's pieces.
Here are a few positions in which white can castle. These diagrams
will show how castling works:
White can castle by moving his King
two squares to the right (as indicated by the arrow).
White can
castle by moving his King
two squares to the left (as indicated by the arrow).
In this position, from a real game, white
can castle by moving his King to the right by two squares.
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Here, white cannot castle to the right (Kingside) because the black
queen controls one square in the King's trajectory. However White can
castle to the left (Queenside) because the queen covers no square in
the King's trajectory.
Black on the other hand can castle to the left(Kingside) but not to the
right (Queenside) as the white queen controls a square that the King
would have to go through.
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Here, white cannot castle to the right (Kingside) because his rook has
already moved. He can however castle to the left (Queenside).
Black on the other hand is in check by the Bishop. So he cannot castle
at all this move.
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