Lebensohl Convention: The 2NT Relay Explained

Lebensohl is a convention for responder after partner opens 1NT and the opponents overcall at the two level: 2NT is an artificial relay to 3♣, which lets you sign off at the three level, while direct three-level bids are forcing. It also uses the timing of your cue bid or 3NT to show whether you have a stopper in the opponents' suit.

The same 2NT relay is used after partner's takeout double of a weak two. Lebensohl is standard equipment in 2/1 Game Force and most tournament versions of Standard American, and many Acol pairs play it too.

Partner opens 1NT and RHO overcalls 2♠. You hold ♠82 ♥J5 ♦KJ9763 ♣1084. You want to play in diamonds. Without Lebensohl, 3♦ would be ambiguous: is it weak, or forcing with a good hand? Partners who play 3♦ as forcing have no way to compete with a weak hand, and partners who play it as weak cannot show a strong one.

Lebensohl solves this:

• 2NT forces partner to bid 3♣. You then pass with clubs or bid your suit at the three level to play.
• A direct three-level suit bid is forcing to game.
• A two-level suit bid is natural and competitive, to play.
• 3NT and the cue bid carry stopper and major-suit information, below.

So the weak hand goes slowly (via 2NT) and the strong hand goes fast (directly). You can see what 2NT means in every system after 1NT (2♠), in 2/1 and four other systems.

The second job of Lebensohl is to find out whether 3NT is safe. You hold game values but no clear suit. The opponents have bid hearts. Does your side have a heart stopper?

The common rule is "fast denies" (often written FADS: Fast Arrival Denies a Stopper):

"Fast" means bidding at once; "slow" means going through 2NT first. When you deny a stopper, opener bids 3NT only with a stopper of their own; otherwise opener looks for another game, usually in a minor or a 4-3 major fit.

Some pairs play the opposite rule, "slow denies." Both work. What matters is that both partners use the same one.

The main uses:

1. Partner opens 1NT and RHO makes a natural two-level overcall. This is the classic case.
2. Partner makes a takeout double of a weak two-bid and RHO passes. Your 2NT is a relay for weak hands, and a direct three-level bid shows values (below).
3. After a reverse by opener, many pairs use a Lebensohl-style 2NT for weak hands, sometimes called Ingberman.
4. After an artificial overcall of 1NT, many pairs adapt it: when the overcall shows a known suit, they treat it like a natural overcall in that suit. Agree the details.

Lebensohl does not apply after a natural overcall at the three level: then 3NT is natural and a cue bid is usually Stayman-like. It also does not apply when RHO doubles 1NT; most pairs play "system on" or a runout scheme there.

A double of the overcall depends on your agreement: many pairs play it as takeout ("negative"), others as penalty. Write it on the card.

Partner opens 1NT (15-17) and RHO overcalls 2♠. This is the first hand from above, shown in full:

You have 5 HCP and six diamonds. Bid 2NT; partner bids 3♣; you bid 3♦ and partner passes.

Double dummy, 3♦ makes exactly: +110. Passing 2♠ would score only +50 here (it goes one down), and 3NT by partner would go three down. The relay gave you the best plus score.

More hands after 1NT (2♥):

• ♠KJ84 ♥73 ♦AQ5 ♣J984: 11 HCP, four spades, no heart stopper. Bid 3♥ at once: Stayman, no stopper. Partner bids 3♠ with four spades or 3NT with a heart stopper.
• ♠Q5 ♥KJ4 ♦K1083 ♣QJ72: 12 HCP, a heart stopper, no four-card major. Bid 2NT, then 3NT over 3♣: stopper shown.
• ♠AQJ1065 ♥84 ♦K62 ♣93: 10 HCP, six good spades. Bid 3♠, forcing: partner bids 4♠ with support or 3NT with a heart stopper and a doubleton spade.
• ♠63 ♥852 ♦Q4 ♣KJ10974: 6 HCP, long clubs. Bid 2NT and pass partner's 3♣.

• Bidding a weak suit directly at the three level. That is forcing. Go through 2NT.
• Forgetting that opener must bid 3♣. The relay is forced. Opener does not show extras over 2NT.
• Mixing up fast and slow. Write your rule on the card and review it before a session.
• Using 2NT as natural. In Lebensohl, 2NT is never natural after an overcall. With a balanced invitational hand, choose between a pass, a double (if your double shows values) and a stretch to 3NT.
• Using Lebensohl after a three-level overcall. It needs room: above 2♠, 2NT cannot be a relay.
• Signing off above the overcall's suit. After 1NT (2♥) 2NT - 3♣, a bid of 3♠ is not a sign-off in standard Lebensohl: it is invitational. Sign-offs are in suits below the overcall.

The same idea helps when partner makes a takeout double of a weak two. Take (2♥) X (P) ?. You must bid, and your hand can be anything from 0 to 12+ points. A direct 3♦ could be a bad hand with five diamonds or a decent hand with values. Lebensohl separates them:

• 2♠: natural, 0-7ish (it costs no level, so no relay is needed).
• 2NT: relay to 3♣, a weak hand (about 0-7) with a minor. You pass 3♣ or correct to 3♦.
• Direct 3♣ / 3♦: about 8-11, a real suit.
• 3♠ (jump): about 8-11 with four or more spades, invitational.
• 3♥ (cue bid): game values, asks for a stopper or a major.
• 3NT: to play, with a heart stopper.
• 4♠: to play.

The doubler with a strong hand can still bid again after the relay, so partner's 2NT does not end the auction when the doubler has extras.

1NT (2x) ? (x = the overcall)

• Pass: weak, or a penalty-oriented hand waiting for partner to reopen.
• X: negative or penalty, by agreement.
• 2-level new suit: to play.
• 2NT: relay to 3♣.
  • Pass 3♣: to play.
  • 3 of a suit below x: to play.
  • 3 of a suit above x: invitational.
  • 3x (slow cue): Stayman with a stopper.
  • 3NT (slow): to play with a stopper.
• 3-level new suit (direct): game forcing.
• 3x (fast cue): Stayman without a stopper.
• 3NT (fast): to play without a stopper.
• 4-level: natural, to play (or transfers, by agreement).

Lebensohl auctions are rare enough that most pairs forget them at the table. Regular practice fixes that. BridgeDummy's bidding puzzles include auctions where partner's 1NT is overcalled, and each call is checked double dummy over many deals that fit the auction, so you see when the sign-off, 3NT or the cue bid scores best.

For full deals with interference, play in the Bidding Room with EPBot robots, alone or with a partner at /bidding/partner.

Related pages: Stayman, Jacoby transfers, weak two bids and cue bids.