Table: f1_race_results_6
Columns: race
circuit
date
pole_position
fastest_lap
winning_driver
constructor
tyre
report

Question: In the Canadian Grand Prix, what tyre was used when Jacky Ickx held pole position?
SQL: SELECT "tyre" FROM f1_race_results_6 WHERE "pole_position" = 'jacky ickx' AND "race" = 'canadian grand prix'

Question: When Jackie Stewart had the fastest lap and Jochen Rindt held the pole position with a D tyre, what was the circuit?
SQL: SELECT "circuit" FROM f1_race_results_6 WHERE "tyre" = 'd' AND "pole_position" = 'jochen rindt' AND "fastest_lap" = 'jackie stewart'

Question: What was the circuit when Jochen Rindt won?
SQL: SELECT "circuit" FROM f1_race_results_6 WHERE "winning_driver" = 'jochen rindt'

Question: What tyre was used in Kyalami?
SQL: SELECT "tyre" FROM f1_race_results_6 WHERE "circuit" = 'kyalami'