Kosumi-tsuke
A diagonal attachment against an opposing stone, often used as a kick to apply pressure.
Also known as
A kosumi-tsuke is a move that attaches diagonally to an opponent’s stone. The played stone is placed on a diagonally adjacent point, creating immediate contact. This shape can restrict the opponent’s options for extending or connecting and may serve as a kick.
The purpose is to apply pressure, reduce mobility, provoke a response, or begin a tactical sequence. Unlike a general attachment, a kosumi-tsuke is defined specifically by its diagonal relationship to the opposing stone. Its value depends greatly on the surrounding shape and the liberties of the stones involved, so the diagonal attachment is not automatically forcing or favorable.
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