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