apollo1201, on 2020-September-25, 00:31, said:
Interesting methods, thanks (not « advertised » in my country). With a former partner we had actually tried to imagine some kind of transfers but just played in one event.
There are two commonly used methods:
1. Wolff Signoffs:
After 2NT, 3 of responder's original major is slam-going with 6+, and 3 of the other major just shows 5-4.
3C and 3D have special meanings.
3D first - that is GF and checkback to see if opener has 3-card support for responder's major or 4 cards in the other major. Some like to show 4OM first; others like to show 3 in the bid major first. There are advantages and disadvantages to both, but either will work. 3NT shows neither 4OM nor 3 in the bid major.
3C is a puppet demanding opener bid 3D. Now:
1. Responder can pass if he just wants to play 3D. Perhaps responder bid 1D over 1C and now just wants to sign off in 3D.
2. Responder can bid 3 of his original major to sign off there.
3. Responder can bid 3 of the other major to indicate a hand that is slam-going in the other minor. That is:
Axxx xx x AQJxxx
After 1D - 1S - 2NT, responder can bid 3H to show a hand with slam interest in clubs.
4. Responder can bid 3NT to show a hand with mild slam interest in opener's minor
5. Responder can bid 4C to show a hand with strong slam interest in opener's minor.
2. Transfers
Every suit transfers to the next higher suit. 3S shows clubs, but opener generally bids 3NT over 3S. You can pretty much intuit all the meanings. For example, you check for 3 of responder's major by transferring back into responder's major and then bidding 3NT:
1D 1S
2NT 3H(transfer)
3S 3NT
This shows 5H and a game-going hand.
I strongly prefer Wolff signoffs; they make a lot more intuitive sense to me. But that's just me.
Cheers,
Mike