Reuven The author presents us a real game book-like situation. This problem demonstrates how a threat of making life may posses enough aji to make life elsewhere. In the game, is played at to which the opponent may respond with a monkey jump to 3, denying any chance of making an eye there.
Incredible how this stones aji helps to keep it alive. Rarely do we get to see such a perfect setting for a tsumego discovered in amateur games.
Black can't deny the life in the corner - White either makes an eye or captures 3 stones to the same effect.