Table: snooker_world_series
Columns: date
venue
winner
runner_up
score

Question: When was the match that had Shaun Murphy as runner-up?
SQL: SELECT "date" FROM snooker_world_series WHERE "runner_up" = 'shaun murphy'

Question: Who was the winner in the match that had John Higgins as runner-up?
SQL: SELECT "winner" FROM snooker_world_series WHERE "runner_up" = 'john higgins'