Bidding and conventions
Lebensohl
Partner opens 1NT, the next player overcalls 2♥, and you hold six clubs and 5 points. You want to play 3♣ and nothing more. Bid it, and partner, holding 17, will raise you to game.
The interference steals a whole level
Without interference a weak hand with a long suit has an easy time: transfer, or bid two of the suit, and partner passes.
The overcall removes that. Every bid you have left starts at the three level, and the three level is where invitational and game-forcing hands live.
4 points. 3♣ is the limit of the hand and probably a better contract than 2♥ doubled.
15 points opposite a 15–17 notrump. This one belongs in 3NT or 6♣, not 3♣.
Both hands want to say "clubs" at the three level, and they want opposite things to happen next. Without an agreement, opener has to guess, and opener will guess wrong on whichever hand you did not have.
The mechanism, with no meaning attached
2NT by responder is a puppet. It carries no message about notrump and no message about strength. It obliges opener to bid 3♣ and nothing else.
That single relay creates a second, slower path to every three-level contract. Responder can reach 3♣ two ways — bid it, or puppet and pass, and 3♦ two ways, and so on.
Two routes to the same contract is two meanings, and that is the whole invention.
| West | North | East | South |
|---|---|---|---|
| 1NT | |||
| 2♥ | 2NT | Pass | 3♣ |
| Pass | Pass | Pass |
Slow shows, fast denies
The slow route — through 2NT — is the weak one. The fast route — bidding the suit directly at the three level — is game-forcing.
The same principle settles the other question the overcall raises, which is whether responder holds a stopper in the opponent's suit. With a hand worth 3NT, the slow route shows a stopper and the direct bid denies one.
The full scheme after 1NT — (2♥)
- 2♠ — natural, non-forcing, weak. Anything you can still bid at the two level means what it says.
- 2NT — puppet to 3♣. Then pass, or bid a suit, to sign off.
- 3♣ or 3♦ directly — natural and game-forcing.
- 3♠ directly — natural and game-forcing.
- 3♥ — a cue bid of their suit, asking opener to describe. Game-forcing, and typically shows the other major.
- 3NT directly — game values, denying a heart stopper. Through 2NT first, it promises one.
- Double — penalty, or takeout, by partnership agreement. Settle this one too.
The other place it lives
Lebensohl is also used after partner's takeout double of a weak two. Partner doubles 2♥, you hold 4 points and five spades, and you must bid, but bidding 2♠ and 3♠ are the only options and one of them overstates you badly.
The same puppet solves the same problem: 2NT forces 3♣, and the slow route to your suit shows the hand that had to bid rather than the hand that wanted to.
Is it worth learning?
Not first. It is a genuinely advanced agreement with several follow-up questions, and it only applies when an opponent overcalls a 1NT opening — perhaps one deal in twenty-five.
Ahead of it, in order: Stayman, transfers, negative doubles and takeout doubles.
What makes it worth reaching eventually is that it fixes a hand type with no other answer. Most conventions improve a contract you would have found anyway; this one is the difference between playing 3♣ for down one and 5♣ for down four.