and { only { filter_eq { all_rows ; tournament at which lead began ; australian championships } } ; eq { hop { filter_eq { all_rows ; tournament at which lead began ; australian championships } ; player } ; roy emerson } } = true
select the rows whose tournament at which lead began record fuzzily matches to australian championships . there is only one such row in the table . the player record of this unqiue row is roy emerson .