Lebensohl after weak two - folksbridge21/system2 GitHub Wiki

弱二阻击后的来本索尔:

敌方阻击开叫2H后，搭档加倍，应叫的一般原则：
(2H) X (P) 2S： Weak,低于8点
(2H) X (P) 3S： 5S； 邀叫，9-11
(2H) X (P) 3H： 问止张，否认有高花
(2H) X (P) 3NT：没有另外高花，有止张 (这点和一无将后的莱本不同，不是fast deny)
(2H）X (P) 2NT (P) 3C (P) 3H:有另外高花4张+，但是没止张 （这点和一无将后的莱本不同，不是fast deny)
(2H）X (P) 2NT (P) 3C (P) 3NT:有另外高花4张+，有止张

敌方阻击开叫2S后，搭档加倍，应叫的一般原则：
(2S) X (P) 2NT (P) 3C (P) 3H： Weak,低于8点
(2S) X (P) 3H： 5H，邀叫，9-11
(2S) X (P) 3S：S 问止张，否认有高花
(2S) X (P) 3NT：没有另外高花，有止张
(2S）X (P) 2NT 3C 3S:有另外高花，但是没止张
(2S）X (P) 2NT 3C 3NT:有另外高花，有止张

直接叫3NT表示有止张，这点和1NT后被干扰后的莱本索尔叫法不同。
直接扣和直接叫3NT都否认了另外一高花。

2NT directly or use Lebensohl to transfer to 3C then correct.
Doubler can deny 3C relay with good hand.

Invitational hand:

If you bid a suit at the 3-level (instead of using the 2NT sequence), it is encouraging, but not forcing. It shows a hand with constructive values (a good 7 to about 10 points), but not enough to jump to game. Doubler can pass with a minimum or bid on with extra values.
You can also use the Lebensohl 2NT to invite when your suit is higher in rank than the preempter's suit. If LHO opens 2H and you have spades, you can sign off in 2S if you're weak. If you instead use the Lebensohl 2NT sequence and bid spades at your next turn, it shows invitational values (8-10 points).

  • (2D)-X-(P)-3H/3S: invitational with 5 card H/S
  • (2D)-X-(P)-2NT-3C-3H/3S: invitational with 4 card H/S
  • (2H)-X-(P)-3S: invitational with 5 card S
  • (2H)-X-(P)-2NT-3C-3S: invitational with 4 card S
  • (2H)-X-(P)-3C/3D: constructive, not game-forcing

GF

  • Immediate 3NT: to play with stopper in Oppo's suit, usually denies 4 card in the other (both) major
  • Immediate cuebid: ask partner to bid 3NT with stopper in Oppo's suit, usually denies 4 card in the other (both) major
  • Immediate jump cuebid: Michaels, shows GF value but not slam
  • Lebensohl then 3NT: shows stopper in Oppo's suit, with 4 card in the other major
  • Lebensohl then cuebid: 4 card in the other major without stopper in Oppo's suit

Slam:

  • (2H)-X-(P)-3H-3NT-4C/4D/4S: single suited slam-invitational hand
  • (2H)-X-(P)-2NT-3C-4C/4D: slam interest with S and C/D
  • (2H)-X-(P)-2NT-3C-4H: slam interest with both minors

Reference: http://kwbridge.com/leb.htm

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