CHESA-Trees, toquets d'ansuree, two pieces of wood bolted perpendicularly, one on the starboard, and another on the larboard, side of the ship. They are used to confine the clue, or lower corners of the main-sail; for which purpose there is a hole in the upper part, through which the rope passes that usually extends the clue of the sail to windward. See TACK.
The chess-trees are commonly placed as far before the main-mast as the length of the main-beam.