Page 33 of sports class rules,

A10.9.3 Gate Finish
This is the "traditional" low-altitude finish, now modified so that times are taken from the Flight Log rather than by gate personnel. This finish is
much more dramatic and spectator-friendly than a Cylinder finish, but it also presents some complications and risks that should be understood:
- Pilots and gate personnel should understand that the radio call of "Mark - Good finish [contest ID]" is now mostly for show: the Scorer
determines whether the finish was within the lateral limits of the gate.
- Gate personnel do determine whether the finish was sufficiently high. If a finish was low, they must inform the CD. They must also note which
pilots do a rolling finish, and supply this information to the Scorer.
- On a task when finishes may come from several directions, some pilots may need to "hook" the end of the gate - to fly around it so they can
finish in the specified direction. Flying through the gate in the direction opposite to the finish is a safety violation.
- If local considerations make unpredictable finish direction a problem, the Cylinder Finish should be used.
- All pilots should understand that the "low pass" or "beat up" maneuver is potentially hazardous -- it has led to stalls and spin entries, and to
closer-than-comfortable encounters between sailplanes.