This is an extension of Lebensohl that allows you to distinguish between competitive and invitational hands when the opponents’ bidding has forced your rebid to the the three-level. For example:
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Opener rebids 2NT as a relay to 3♣ to show a competitive rebid of his own suit, or responder’s major. Direct bids at the three-level show invitational hands that would have jumped to the three-level without competition. Both the 2NT bid and the 3-level bids are alertable.
When responder has a hand that cannot stand to be passed in 3♣, she should bid something else. This can be one of two hands: a weak hand with a better suggestion of where to play, or a hand that wants to try for game. The weak hand will only happen after a negative double.
For example:
| They | We | They | We |
|---|---|---|---|
| 1♣ | 1♠ | Dbl | |
| 2♠ | 2NT | Pass | 3♥ |
Would show a weak hand with long hearts and no club tolerance (if you had a good hand, you would have bid 2♥ the first time).
| They | We | They | We |
|---|---|---|---|
| 1♣ | 1♥ | 1♠ | |
| 2♥ | 2NT | Pass | 3♦ |
Forcing for one round.