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©-1ª=

Pass=Trans -> DBL

     *4+ª

     *MAX,unbal,0-1ª

DBL=2-3ª

1NT=Stopper

2§=minimum,5+§,0-1ª

2¨=minimum,5+¨,0-1ª

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

2ª=minimum,5+ª,0-1§

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

1©-2¨=

Pass=Trans -> DBL

     *4+¨

     *MAX,unbal,0-1¨

DBL=2-3¨

2©=Preempt

2ª=minimum,5+ª,0-1¨

3§=minimum,5+§,0-1¨
1ª

1ª-1NT=

Pass=Trans -> DBL

     *2+ª

     *MAXIMUM,unbal

DBL=4+ª

2§=minimum,5+§

2¨=minimum,5+¨

2©=minimum,5+©

2ª=Preempt

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

1ª-2§=

Pass=Trans -> DBL

     *4+§

     *MAX,unbal,0-1§

DBL=2-3§

2¨=minimum,5+¨,0-1§

2©=minimum,5+©,0-1§

2ª=Preempt

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

1ª-2¨=

Pass=Trans -> DBL

     *4+¨

     *MAX,unbal,0-1¨

DBL=2-3¨

2©=minimum,5+©,0-1¨

2ª=Preempt

2NT=Stoppers

3§=minimum,5+§,0-1¨

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

1ª-2©=

Pass=Trans -> DBL

     *4+©

     *MAX,unbal,0-1©

DBL=2-3©

2ª=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§

2ª=minimum,5+ª,0-1§

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

1NT-2¨=

Pass=Trans -> DBL

     *4+¨

     *MAX,unbal,0-1¨

DBL=2-3¨

2©=minimum,5+©,0-1¨

2ª=minimum,5+ª,0-1¨

3§=minimum,5+§,0-1¨

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

1NT-2©=

Pass=Trans -> DBL

     *4+©

     *MAX,unbal,0-1©

DBL=2-3©

2ª=min,5+ª,0-1©

3§=min,5+§,0-1©

3¨=min,5+¨,0-1©

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

1NT-2ª=

Pass=Trans -> DBL

     *4+ª

     *MAX,0-1ª

DBL=2-3ª

3§=min,5+§,0-1ª

3¨=min,5+¨,0-1ª

3©=min,5+©,0-1ª