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

     *4+

     *MAX,unbal,0-1

DBL=2-3

1NT=Stopper

2=minimum,5+,0-1

2=minimum,5+,0-1

2=Preempt

------------------------

1-1NT=

Pass=Trans -> DBL

     *2+

     *MAXIMUM,unbal

DBL=4+

2=minimum,5+

2=minimum,5+

2=Preempt

------------------------

1-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=minimum,5+,0-1

2=Preempt

2=minimum,5+,0-1

------------------------

1-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=Preempt

2=minimum,5+,0-1

3=minimum,5+,0-1

1

1-1NT=

Pass=Trans -> DBL

     *2+

     *MAXIMUM,unbal

DBL=4+

2=minimum,5+

2=minimum,5+

2=minimum,5+

2=Preempt

------------------------

1-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=minimum,5+,0-1

2=minimum,5+,0-1

2=Preempt

------------------------

1-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=minimum,5+,0-1

2=Preempt

2NT=Stoppers

3=minimum,5+,0-1

------------------------

1-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=Preempt

2NT=Stoppers

3=minimum,5+,0-1

3=minimum,5+,0-1

1NT

1NT-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=minimum,5+,0-1

2=minimum,5+,0-1

2=minimum,5+,0-1

------------------------

1NT-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=minimum,5+,0-1

2=minimum,5+,0-1

3=minimum,5+,0-1

------------------------

1NT-2=

Pass=Trans -> DBL

     *4+

     *MAX,unbal,0-1

DBL=2-3

2=min,5+,0-1

3=min,5+,0-1

3=min,5+,0-1

------------------------

1NT-2=

Pass=Trans -> DBL

     *4+

     *MAX,0-1

DBL=2-3

3=min,5+,0-1

3=min,5+,0-1

3=min,5+,0-1