1M - pass - 2x - pass 後的2/1 system 簡介如下:
1. Opener rebids 2NT = 12-14 or 18-19 HCP,B.H,未叫各門有擋.
    Responder: 1. 叫原花色 = game forcing, slam try.
                        2. 支持開叫人
                           a.  1S - pass - 2C - pass ;
                                2NT - pass - 3S = choice of game or slam try.
                           b.  1S - pass - 2C - pass ;
                                2NT - pass - 4S = sign off,開叫人18-19才可再叫.
                        3. 跳叫新花 = splinter raise.
                        4. 叫3NT = To play.
                        5. 叫4NT = 邀請6NT.
                        6. 叫新花 = choice of game or slam try.
                        7. 可約定用4C or 5C 來問 Ace.

2. Opener rebids 3NT = 15-17 HCP,B.H,未叫各門有擋.
3. Opener rebids his major = 12-21 HCP,無其它適當叫品.
     Responder: 1. 叫原花色 = invitational and nonforcing.
                         2. 支持開叫人
                            a.  1S - pass - 2C - pass ;
                                 2S - pass - 3S = choice of game or slam try.
                            b.  1S - pass - 2C - pass ;
                                 2S - pass - 4S = 低限,但非絕對束叫.
                         3. 跳叫新花 = splinter raise.
                         4. 叫2NT = 12-14 or 18-19 HCP,未叫各門有擋,牌型不
                                           一定很平均.
                         5. 叫3NT = 15-17 HCP,B.H,未叫各門有擋.
                         6. 叫新花 = 可能是真牌組,也可能是假叫的"第四門花色"
                                 1S - pass - 2D - pass ;
                                 2S - pass - 3C - pass ;
                                 4C * 因為3C可能是假牌組,所以此時Responder之4D,4S
                                        都可能只是逃跑,不迫叫.
4. Opener rebids 3M = solid suit and slam try.
5. Opener rebids 4M = solid suit and no interesting in slam.
6. Opener bids a new suit (not reverse) = 12-21 HCP, 另一門牌組.
    Responder: 1. 叫原花色 = invitational and nonforcing.
                        2. 支持開叫人第一門花色
                           a.  1S - pass - 2C - pass ;
                                2D - pass - 2S = choice of game or slam try.
                           b.  1S - pass - 2C - pass ;
                                2D - pass - 3S = 16+pts, good S+C, slam try.
                           c.  1S - pass - 2C - pass ;
                                2D - pass - 4S = good S+C, no control in H&D.
                        3. 叫2NT = 12-14 or 18-19 HCP,未叫各門有擋,牌型不
                                           一定很平均.
                        4. 叫3NT = 15-17 HCP,B.H,未叫各門有擋.
                        5. 支持開叫人第二門花色 = 至少四張支持.
                        6. 跳叫新花 = 對第二門的 splinter raise.
                        7. 1S - pass - 2m - pass ;
                            2H - pass - 4H = good m+H, no control in S&om.
                        8. 叫新花 = 可能是真牌組,也可能是假叫的"第四門花色"
7. Opener bids a new suit (reverse) = 16+pts,建立了迫叫成局程序.
8. Opener jump shifts (at three level) = 12-21 HCP, good two suiter
9. Opener raises responder's suit = a. raise a Major:不需額外力量
                             b. raise a minor:要有額外力量.
              EG : 1. 1S - pass - 2H - pass ;
                          3H - pass - ?    4H/3NT = no other intresting
                          3S/4C/4D = cue bid
                          4S = good H+S, no control in C&D
                      2. 1S - pass - 2C - pass ;
                          3C - pass - ?    3D/3H = try 3NT or cue bid for slam try.
                          3S = spade raise
                          4S = good C+S, no control in H&D
                      3. 1S - pass - 2H - pass ;
                          4H = good S+H, no control in C&D
                      4. 1S - pass - 2H - pass ;
                          4C/D = splinter raise.