notable rule change

8 triples
GPTKB property

Random triples
Subject Object
gptkb:World_Boxing_Council_(WBC) introduction of instant replay in boxing
gptkb:World_Hockey_Association allowed players under 20
gptkb:1974_NFL_season introduction of overtime in regular season
gptkb:World_Boxing_Council_(WBC) reduction of championship bouts from 15 to 12 rounds
gptkb:World_Hockey_Association no reserve clause
gptkb:World_Boxing_Council_(WBC) introduction of mandatory challenger system
gptkb:World_Boxing_Council_(WBC) introduction of anti-doping programs
gptkb:1974_NFL_season goal posts moved to back of end zone