Checkback Stayman is a convention. This convention is alertable.
Checkback Stayman is a convention to find a major suit fit. It is similar to 2♣ Stayman after 1NT opening, but checkback Stayman is applied by the responder after a 1NT or 2NT rebid by the opener.
Convention
The following sequences activate this convention:
| Opener | Responder |
|---|---|
| 1♣/1♦ | 1♥/1♠1 |
| 1NT2 | 2♣3 |
| Opener | Responder |
|---|---|
| 1♣/1♦ | 1♥/1♠1 |
| 2NT2 | 3♣3 |
- showing 4 or more of the suit
- denying 4 of responders suit
- checkback Stayman, shows at least invitational values with 5 cards in the bid major OR 4 cards in the other major.
After 2♣, opener's rebids are:
Implication
If checkback Stayman is on after a 1NT rebid by opener, the following sequence is weak:
| Opener | Responder |
|---|---|
| 1♣ | 1♠ |
| 1NT | 2♥ |
This shows at least 5 ♠s and 4 ♥s with about 6 to 9 points. With more points, 2♣ would be bid in place of 2♥.