The promoter was Mr. Chit Ampolsin

(Kru Chit). Bouts were organized every Sunday from 4 to 7 p.m. The rules were
those of the Department of Physical Education. Bouts were five three-minute
rounds in length, with two minutes rest between rounds. The boxers were weighed
by stone. Two years later, weight was measured in kilograms, and in B.E. 2491
(1948 CE) pounds were adopted as the measure of a boxer’s weight so as to be in
accord with international standards. Divisions were assigned by weight, for
example, not over 112 pounds.