♥ 10 4
♦ K 6 5
♣ K 8 7
| WEST | NORTH | EAST | SOUTH |
| 1♠ | pass | 1NT | |
| pass | 2♣ | pass | 2♥ |
| pass | pass | pass |
North opens 1♠.
South has 11 points, enough to respond 2♥ in standard bidding, but not when using 2/1. So she bids 1NT.
North would love to pass 1NT but is not permitted to do so. He has no good bid, so he must bid a 3-card suit. When holding two 3-card minors, usually bid ♣s.
South now shows the ♥ suit that she could not bid first round.
North was forced to reply to 1NT, but he is not forced to bid again. With his minimum hand and a tolerance for partner's suit he just passes and the partnership ends up in a reasonable contract.
This hand demonstrates one of the benefits of Forcing 1NT. In standard bidding South's first response would be 2♥, and North would have to bid again, probably 2NT. The partnership might go even higher but in any case would probably not reach a good contract.
Deal 16
♥ K Q J 7 5 3
♦ 4 3 2
♣ Q 5 4