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Bridge & Bridgeframe

Unlike sides, corners are mutually exclusive, so the options for making a bridge are limited to begin with. A frame requires that the two corners involved are occupied before the frame is established, lest the opponent might refute the plan by snatching away one corner. This means investing in moves whose efficiency is granted only in a narrow context, inviting the opponent cut and render them useless.
Because of these properties, the bridge, like the ring, is mainly a tactical weapon. Cornerpoints, apart from their inherent danger as part of a bridge, play an important role in joseki (corner disputes) because they form a connection between two sides. Three stones can add up to two sides and a corner, and if a chain containing such a triplet comes out in the open, it may connect up successfully almost anywhere.

For some tactical implications of the bridge, see the block.