Bridge

A bridge, or a two-bridge, is a type of connection between two pieces. It is the equivalent of a diagonal connection on a Go board.

The idea is that when the opponent "intrudes" on the bridge by moving in one of the empty hexes between the pieces, you simply move in the other. Bridges are often very strong, and a quick way to advance across the board. They can sometimes be exploited, by the opposing player gaining a "free" move on one of the connecting hexes (as the red player will probably want to respond by playing immediately on the other connecting hex, to secure his connection).