Lebensohl after 1NT - folksbridge21/system2 GitHub Wiki

Fast deny 直接叫3nt否认控制和另外一高花，扣叫表示有另外一高花。直接扣叫没止有另外一高花，走莱本后扣有止也有另外一高花。

1NT-(2S)-3NT: denies control in oppo suit (Fast deny)

1NT-(2S)-2NT-3C-3NT: promise control in oppo suit (slow show)

1NT-(2S)-2NT-3C: pass or correct with weak hand (weak hand)

1NT-(2S)-3C/3D/3H: GF, 5 card suit, do not promise stopper in S

1NT-(2S)-X: take-out, forcing one round

1NT-(2S)-3S: 4 card H without stopper in S, GF

1NT-(2S)-2NT-3C-3S: 4 card H with stopper in S, GF

1NT-(2H)-2S: weak hand, non-forcing

1NT-(2H)-2NT-3C-3S: invitational with 6 card S

1NT-(2H)-3S: GF with 5 card S

1NT-(2H)-X: take-out, forcing one round

1NT-(2H)-3H: 4 card S without stopper in H, GF

1NT-(2H)-2NT-3C-3H: 4 card S with stopper in H, GF