0 present participle of castle
1 in chess, to make a special move that puts your king in a more protected place at the side of the board
Suppose, for example, that you have two communities of chess players: one plays the game with a rule that allows castling, while the other community plays it without this rule.
Second, if the king and rook are on their original squares, castling may or may not be allowed.
If a player starts to castle illegally, another legal king move must be made if possible, including castling with the other rook.
When castling, the king must be the first piece touched.
Then an additional s has to precede the castling tokens.
Such a position for either of the players is often achieved by castling by that player.
It is a common misperception that the requirements for castling are even more stringent than the above.
After the first move, players alternately move one piece per turn (except for castling, when two pieces are moved).
