[pescetom]

playing 5cM with strong NT, your partner opens 1m more or less natural, his LHO overcalls 2M described as weak.
What are your agreements for Double and the various possible bids?

[TylerE]

Just standard stuff. X is negative, bids are natural and forcing. Might make sense to play a lebensohl type structure here, but in my main partnership we don't. Honestly, it's not generally an action I expect to score very well for our opponents most of the time, so we just want to get to our obvious games/slams and otherwise I'm happy to sit back and collect 50 (or especially 100) a trick, like if I've got some random 9 count or something. Precision partnership with 14-16 NT so I know (Assuming a 1d opening and not 1c) partner is max 13 balanced or a bad-average 15 unbalanced.

[pescetom]

Thanks, although I did say 1m more or less natural. Either both 3+ cards or clubs 2+ (2 only in 4432) and diamonds 4+, both unlimited 12(11)+ HCP.

[TylerE]

pescetom, on 2026-June-10, 15:34, said:

Thanks, although I did say 1m more or less natural. At most clubs 2+ in 4432 and diamonds 4+, both unlimited 12(11)+ HCP.

You asked what I would do given a 5cM/Strong NT framework. You didn't specify an exact system.

[bluenikki]

TylerE, on 2026-June-10, 14:56, said:

Just standard stuff. X is negative,

But isn't the issue what the meaning of "double" is at that level? How firm is the promise of 4+ in the other major?

[mike777]

Pretty firm.
98.61%

[awm]

Double definitely shows the other major. New suits natural and forcing (three-level new suits game forcing). Simple raise is something like 8-11 and usually five-card support (maybe four is possible in a pinch). 2NT natural. Double and then freely bid the other major is constructive but not forcing.

We do play lebensohl in the auction 1m-(2M)-Pass-(Pass)-Dbl-(Pass); so bidding directly here shows some values (typically like 7-10, enough for game opposite 18-19 balanced for example) while going through 2NT is weaker.

[pescetom]

 awm, on 2026-June-11, 01:31, said:

Double definitely shows the other major. New suits natural and forcing (three-level new suits game forcing). Simple raise is something like 8-11 and usually five-card support (maybe four is possible in a pinch). 2NT natural. Double and then freely bid the other major is constructive but not forcing.

When you say 2NT natural, does that imply both NF and some degree of stop in opponent's suit?

What is a cue (so at 3 level, but non-jump) of opponents' major suit? Another raise of Opener's minor, a splinter raise, or a stopper ask? If not a stopper ask, then how does one go about seeking 3NT with 13-16 but no stopper: bid 3 in the other minor as game force? What are the meanings of Opener's 3M rebids after that?

[mw64ahw]

I aim to mirror the transfer lebensohl approach I play over 1N, easier on the memory.
1♣ is often a Weak NT and playing an unbalanced ♦ the 2M overcall mostly represents opener's shortage.
X is invitational with the other Major or 5+♣ if partner opened 1♦