Current class rules state: i. The mainsheet shall be a single line, and be attached to the becket of the aft boom block, and then passed through the traveller block, the aft boom block, boom eye strap, forward boom block and the mainsheet block. After the mainsheet block it shall be knotted. The mainsheet shall not be controlled aft of the forward boom block except to facilitate a tack or gybe. ii. The tail of the mainsheet may also be knotted or tied to either the base of the mainsheet block, the hiking strap, the hiking strap support line, or the hiking strap shock cord. Our current class measurer in the UK currently says that you must have a knot after the mainsheet block even if there is another knot tying it to the toestrap. See photos. Does the knot tying the mainsheet to the toestrap not count? It's still a knot.