A particular move, usually used in the end-game, which can reduce one's opponent's territory significantly. A monkey jump can be played when the attacker has a strong stone on the second line and the defender has no nearby stones on the first or second line guarding his hoped-for territory. The attacker places a stone on the first line three spaces into the defender's territory from the strong stone. Due to the special properties of the edge of the board, the defender can not usually cut off the stone.