Castling Chess:
1. A king is allowed to castle even if it has already moved.
2. A king is allowed to castle with any piece of either colour, standing on the same diagonal or orthogonal, under the assumption that intevening squares are empty, it is not in check and it will not cross fields attacked by the enemy.
3. For the implementation of castling the king moves two squares towards its partner, while this partner jumps over the king and lands on the next square.

Locust(L): Moves along Queen lines only by capturing an enemy unit, arriving on the square immediately beyond that unit, which must be vacant.