XYZ - folksbridge21/system2 GitHub Wiki

1C 1H 1S/1NT or 1C 1D 1H/1S/1NT:

• 2♣ -relay to 2♦.

1C-1H/1S-1NT-2C-2D-2H/S, 5M, invit

• 2♦ Artificial and game forcing.
• 2NT - relay to 3C：1X 1Y 1Z 2NT, relay to 3c.
• 3♦/3♥/3♠ Strong suit or support – slam try.

打XYZ, 所有邀叫都走2C, 逼叫可以用各种手段 应叫人不使用XYZ,跳叫新花都是5-5套, GF
like : 1D 1S 1NT 3C/3D/3H

• 1C-1S-1NT-2H: 5S4H GF， 因为我们打reverse flannery
  
• 1C-1H/1S-1NT-2C-2D-3nt; 搭档没用2D check back, 表示5332，5张高花的平均逼局牌型，开叫人可以选择高花或者无将
  

XYZ is on for passed hand
XYZ is on after opp's takeout X
XYZ is off after opp's overcall