Question: Who was the opponent at the QF(R) round?
SQL: SELECT "Opponent" FROM "2-12755786-4" WHERE "Round" = 'QF(R)';

Question: What day was the game held at Firhill against Ayr United?
SQL: SELECT "Date" FROM "2-12755786-4" WHERE "Venue" = 'Firhill' AND "Opponent" = 'Ayr United';

Question: What is the average attendance at a game held at Firhill for the 5(R) round?
SQL: SELECT AVG("Attendance") FROM "2-12755786-4" WHERE "Venue" = 'Firhill' AND "Round" = '5(R)';