<Li> 1974: Use of "bigger ball" (1.68 in, 42.67 mm) made compulsory </Li> <Li> 1978: "10 - shot rule" introduced so that players within 10 shots of the leader make the cut even if outside the top 80 / 60 </Li> <Li> 1980: Play from Thursday to Sunday </Li> <Li> 1986: 54 - hole cut discontinued . Cut rule changed to top 70 and ties after 36 holes . Four - hole playoff introduced </Li>

Where is the british open played each year