Question: Which entrant has 4 points and BRM P25 for the Chassis?
SQL: SELECT "Entrant" FROM "2-128171-1" WHERE "Pts." = '4' AND "Chassis" = 'BRM P25';

Question: Who is the entrant when the year is less than 1953?
SQL: SELECT "Entrant" FROM "2-128171-1" WHERE "Year" < 1953.0;

Question: How many points were scored when the Chassis is BRM P25?
SQL: SELECT "Pts." FROM "2-128171-1" WHERE "Chassis" = 'BRM P25';