Convention Needed?
Playing rubber bridge you pick up the following hand:
Q T 9 3 
A 
7 3 
A Q J 8 5 3.
You open 1 and partner responds 1 . The opponents are silent and you rebid 1 . Partner bids 2 , an artificial game force, so you make your natural rebid of 3 . Partner now reveals spade support and extras with 3 .
What should you call?
The solution is here.