♥ A Q 9 8 3
♦ 8 5
♣ 8 6
| WEST | NORTH | EAST | SOUTH |
| 1♥ | pass | 2♦ | |
| pass | 2♠ | pass | 2NT |
| pass | 3NT | pass | pass |
| pass |
North opens 1♥, his 5-card Major.
South, with 14 points, naturally responds 2♦, forcing the partnership to game.
North next bids 2♠, showing the other Major suit. In standard bidding North would not be able to bid the ♠s since that would be a Reverse and North is far too weak to Reverse. But after a 2/1 Response the concept of a Reverse does not apply, and the priority of showing a 4-card Major certainly does apply.
South assumes North to be 4-5 in the Majors, so she cannot support either. She bids 2NT. If North actually has 6 ♥s (or 5 ♠s) he will rebid the suit. South's 2NT bid guarantees a stopper in the fourth suit.
North does not have either 6 ♥s or 5 ♠s so he just bids 3NT. Notice that North never once considered the possibility of passing what might be a misfit - the initial 2/1 response unconditionally forced the partnership to reach a game somewhere.
Deal 9
♥ K 4
♦ A Q J 10 7
♣ K 9 7