The Exceptions
If responder is a passed hand, the game force is off:
South:♠ A J 4 South West North East
♥ 9 8 Pass Pass 1♥ Pass
♦ K Q J 7 6 2♦
♣ 9 8 7
South’s 2♦ bid is not a game-forcing bid. It shows 11-12 points.
If there is an overcall or double after the opening bid, 2/1 is not a game-forcing bid:
North:♠ A 2 South West North
♥ K 9 7 1♠ 2♣ 2♦*
♦ K J 8 5 4
♣ 4 3 2
* Not Game-Forcing - North's 2♦ bid is only forcing for one round; it can be made with 11+ points.
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North:
♠ A 3 2 South West North
♥ 8 2 1♥ Dbl 2♣*
♦ 7 5
♣ Q 9 8 7 6 5
* Not forcing at all - North would show 10+ points by redoubling.