Source: www.rpbridge.net

In a Nutshell

In the mid 1970s the usual expert way to cope with an overcall of partner’s 1 NT opening involved the Lebensohl convention — an artificial 2 NT response which forced 3Club Suitby opener, then responder could pass or show various hand types. A serious flaw in this was the loss of the transfer aspect (unless responder has clubs), which is even more important after an overcall.

My solution was to define all bids from 2 NT through 3Heart Suitas transfers to the next higher suit, with the provision that transferring to the enemy suit becomes Stayman. Since a bid of 3Spade Suit is no longer needed, I use it artificially to ask for a stopper.

Details

West
1NT
2NT
North
Dbl
Dbl
East
?
?
South
Call Meaning
Redouble rescue with one minor suit; opener should bid clubs
Other entire system on

After an enemy suit overcall, a different structure is incorporated as described below. Competitive transfer bids show game interest if suit could be bid naturally at the 2 level; else they may be weak.

West
1NT
1NT
2NT
North
2 X
3 X
3 X
East
?
?
?
South
Call Meaning
Pass forcing after 2NT opening; opener should usually double (optional)
Double
penalty at 2 level, negative at 3 level
2 of suit takeout if shown by enemy natural if not shown; NF
2NT thru 3Heart Suit transfer to suit above, or “Stayman” if next higher suit was naturally bid (not implied) by the overcaller
3Spade Suit asks for stopper in enemy shown suit
3NT sign-off
4Club Suit Gerber (even if nonjump)
4Diamond Suit, 4Heart Suit transfer to major above, or splinter slam  try if next higher suit is enemy suit
4NT quantitative

 

West
1NT
North
2NT*
East
?
South

*minors

Call Meaning
Double creates forcing auction
3Club Suit Stayman (not puppet)
Other as above

Rebids by opener:

West
1NT
?
North
Bid
East
Xfr
South
P
Call Meaning
Complete Xfr maximum; good fit
Jump raise maximum; good stopper
3NT  
West
1NT
?
North
2 X
East
Sta
South
P
Call Meaning
Cue-bid no stopper; no unbid major
3 unbid major 4+ cards
3NT stopper; no unbid major
West
1NT
?
North
Bid
East
3Spade Suit
South
P
Call Meaning
3NT stopper in enemy suit
4 of suit 4+ cards; no stopper; NF
Cue-bid maximum; no stopper; GF