3NT after One Over One

This rebid is reserved for a good hand and a long suit. After 1 Club - 1 Heart, the responder, holding:

• KQ2 7 AJ9 AKJ962 - rebids 3NT
• Q AK8 K54 AKQ973 - rebids 3 Clubs

In the latter case the opening bidder underbids because of the pronounced weakness in spades

Unlike the 2NT rebid, the 3NT rebid does not suggest balanced distribution. The responder must not rebid his own suit without a one-dimensional holding. After 1 Club - 1 Heart - 3NT, the responder, holding:

• K5 QJ8642 J52 53 - passes
• K43 Q98743 8 854 - bids 4 Clubs. The opening bidder may retreat to 4NT with a rock-solid club suit, or to 5 Clubs otherwise
• QJ2 KJ10986 J975 _ - bids 4 Hearts

3NT after Two Over One

This rebid handles balanced strong openers with a suit higher-ranking than the responder's. After 1 Heart - 2 Diamonds, the opening bidder, holding:

• AK5 AQ52 KJ3 A106 - rebids 3NT
• AK82 AKJ5 74 A83 - rebids 2 Spades
• A5 QJ854 KQ5 AK8 - rebids 2 Hearts
• AJ Q8654 KQ5 AK8 - rebids 3NT

After two over one, the opening bidder takes care to rebid a good five-card suit. The 3NT rebid tells the responder that the opening bidder opened a four-card suit or a weak five-card suit. In the second example, the opening bidder, as always, does not ignore a four-card suit that can be shown at the current level.