The wide attack is closed by playing a straight in the centre. Forced plays do the rest. Loop attacks may use more tiles than the examples shown here, and appear in all shapes and sizes. A corner is any single path that may be formed into a loop attack in a single turn. The simplest type of corner is a single curve.
Corners are important in TRAX because they represent attacking potential.
A connectable pair is a pair of adjacent paths, which when linked at either end, will result in a loop attack at the other end. Connectable pairs and corners are of similar importance in terms of potential. A white connectable pair is shown here. A cave is an empty region of the playing area which has tile on any three or all four sides. An L is a special case of a 2-stage threat where 2 simultaneous attacks may be made by playing into an L shaped region.