Table: tennis_matches_6
Columns: outcome
year
championship
surface
partner
opponents_in_the_final
score_in_the_final

Question: What championship was played with Allan Stone as a partner?
SQL: SELECT "championship" FROM tennis_matches_6 WHERE "partner" = 'Allan Stone'

Question: How many different partners played in the finale in 1973?
SQL: SELECT COUNT("partner") FROM tennis_matches_6 WHERE "year" = 1973

Question: What was the score in the final played with Fred McNair as partner?
SQL: SELECT "score_in_the_final" FROM tennis_matches_6 WHERE "partner" = 'Fred McNair'