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Study recommended for dan players.
(Show more of this level)


is a defensive move which makes sure white will not take the corner.

In normal conditions white should not play as seen in the next diagram, because black will next play .

However if also black is convinced that this sequence is better for white. Then he can play the hane (see main diagram). As a result he can still setup a ko in a later stage of the game.

On the other hand the hane (as seen in the main diagram) is a waste of aji and kothreats if white did not even play to take the corner at all.