Table: giovanna_amati_race_results
Columns: year
entrant
chassis
engine
tyres
points

Question: For a year earlier than 1991 and a reynard 91d chassis, what's the highest points?
SQL: SELECT MAX("points") FROM giovanna_amati_race_results WHERE "chassis" = 'reynard 91d' AND "year" < 1991

Question: Total points for a bs automotive entrant?
SQL: SELECT COUNT("points") FROM giovanna_amati_race_results WHERE "entrant" = 'bs automotive'

Question: What is a colt racing entrant engine?
SQL: SELECT "engine" FROM giovanna_amati_race_results WHERE "entrant" = 'colt racing'