Norberto Bocchi(left) and Giorgio Duboin(right)

2001

2003

Inverted doubles

after overcall

  • As interference handle Bocchi-Duboin uses inverted doubles. This feature means that a pass by responder after a LHO is a strong call forcing opener to DBL.
  • The standard is:
    • Pass= 4+cards in opps.'  overcall suit or MAXIMUM unbalanced hand
    • DBL=2-3 cards in opps.' suit  or for penalty
    • New suit or raise are both weak

More info: Note 12

 

Signatures

  • Green = Opposition
  • Blue = First bid from our side
  • RED = Responds from our side
  • Purple = Openers rebids
  • #Black = System link
1

1-1

 

Pass=Trans -> DBL

     *3+

     *MAX,unbal,0-1

DBL=4+

1=4+

1=8+HcP,No 4cd MAJOR

1NT=Natural

2=8+HcP,5+

2=5+

2=5+

2=8-11HcP,4 + 5

2NT=7-10HcP,5 + 5

3=8-11HcP,4 + 5


1-1

 

Pass=Trans -> DBL

     *3+

     *MAX,unbal,0-1

DBL=4+

1=8+HcP,No 4cd MAJOR

1NT=Natural

2=8+HcP,5+

2=8+HcP,5+

2=5+

2=8-11HcP,4 + 5

2NT=7-10HcP,5 + 5

3=8-11HcP,4 + 5

3=8-10HcP,6+,good


Pass=Trans -> DBL

     *3+

     *MAX,unbal,0-1

DBL=4+

1NT=Natural

2=8+HcP,5+

2=5+

2=5+

2=9+HcP,No MAJOR

2NT=7-10HcP,5 + 5

3=8-11HcP,4 + 5

3=8-10HcP,6+,good

3=8-10HcP,6+,good

1

1-1=

 

Pass=Trans -> DBL

     *3+

     *MAX,unbal,0-1

DBL=4+

1=8+HcP,No 4cd MAJOR

1NT=Natural

2=Weak raise of diam

2=9+HcP,5+

2=*5,GF

    *6+,Limit or better

2=Limit or better raise of diamonds

2NT=7-10HcP,5+ + 5+

3=9-10HcP,6+,Good

3=Preempt


1-1=

 

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=4+

1NT=Natural

2=Weak raise of diam

2=*5,GF

    *6+,Limit or better

2=9+HcP,5+

2=Limit or better raise of diamonds

2NT=7-10HcP,5+ + 5+

3=9-10HcP,6+,Good

3=Preempt

3=9+HcP,6+,Good


1-1NT

Pass=Trans -> DBL

     *5-4 MAJORS

Pass-DBL-2=5-4 MAJORS

DBL=Penalty

2=minimum,5+

2=Preempt

2=minimum,5+

2=minimum,5+


1-2

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=Preempt

2=minimum,5+,0-1

2=minimum,5+,0-1