Various 1st and 4th round pairings from 1966, 1967, 1968, 1975 and 1983
1966 -- 1st Round -- Six Minute Intervals
1966 -- 4th Round -- Seven Minute Intervals
1967 -- 1st Round -- Seven Minute Intervals
1968 -- 1st Round -- Seven Minute Intervals
1968 -- 4th Round -- Eight Minute Intervals
1975 -- 4th Round -- Eight Minute Intervals
1983 -- 4th Round -- Eight Minute Intervals
