The pilot was carrying out a period of solo circuits as part of a check on the aircraft type. Following the third circuit, the aircraft was observed to approach and land normally into the 10 to 15 knot headwind. During the subsequent landing roll, while still travelling at about 30 knots, the aircraft veered suddenly to the left. The pilot applied full right brake and rudder and then both brakes in an attempt to stop the aircraft. However, before the aircraft stopped it struck one of the boundary fence posts. An inspection of the aircraft did not reveal any mechanical defects that could have contributed to the occurrence, and the pilot was unable to explain the reason for the loss of directional control. This accident was not the subject of an on-site investigation.