1C* 1D*
2x      19-21 HCP, 5+x, NF
2N      19-21 HCP, BAL                     (後續同開2N)
3C*     19-22 HCP, 4441/5440, D short      (報上一級短門)
3D*     19-22 HCP, 4441/5440, H short      (報上一級短門)
3H*     19-22 HCP, 4441/5440, S short      (報上一級短門)
3S*     19-22 HCP, 4441/5440, C short      (報上一級短門)
3N*     19-21 HCP, minors 55+
4C*     23+ HCP, 4441/5440, m short        (4D*=ask, then 4H/S=D/C spl)
4D*     23+ HCP, 4441/5440, H short        (報上一級短門)
4H*     23+ HCP, 4441/5440, S short        (報上一級短門)

開叫的人拿4441/5440牌型決定叫3x或是4x
取決於是不是在對到答叫者拿白皮時依然想打一局

1C* 1D*
2x  答叫新花    NAT, F1
    加叫原花    inv
    跳叫新花    best fit, splinter

1C* 1D*
2N  後續詳同開叫2NT

1C* 1D*
3x* 答叫該短門  中高限ST, puppet to x+1 then set trump
    else        S/O

1C* 1D*
3N! ps/4m/5m    S/O
    4H!         set C, ST
    4S!         set D, ST
    4N!         6 key cards rkcb

1C* 1D*
4x* 答叫該短門  對最高長門牌組rkcb
    else        S/O