Bocchi-Duboin

Leads(suit):3/5,Low=Odd

A(ask ATT)=AK,AKJT(+),

AKx(+),Ax(+)

K(ask CTRL)=AKJT(+),AKx(+)

Q=KQ,KQ(J/T)x(+),KQx(+)

J=QJx(+)

T=T9,JTx(+)

9=T9x(+)9x,HT9x(+)

Hi-x:Sx,xSxx,HxSx,HxxxSx

Lo-x:xxS,xxxS,HxS,HxxxS

Leads(NT):

Open:3/5,Attitude

Subsequent: 3/5,Low=Odd

A(ask ATT)=AK,AKx(+),Ax(+)

K(ask CTRL/UB)=AKJT(+),

KQT9(+)

Q=AQJx(+),KQ(+)KQ(J/T)x(+),

QJx(+)

J=(A/K)JTx(+)JTx(+)QJx(+)

T=T9,T9x(+),HT9x(+)

9=H98x(+)

Hi-x:Sx,HxS,xSx,xSxx,

HxSx,HxSSx

Lo-x:HTxS,HHxS,HTxxS,HHxxS

Signals:

order of priority

Partner lead:

1. Odd=Encourage

2. Hi/lo=Odd

3. S/P

Declarers lead:

1. Hi/lo=Odd

2. S/P

SUIT(Discards):

1. Odd=Encourage

2. S/P

NT(Discards):

1. S/P

Trumps:

1. Hi/Lo=Interest

Smith signal,Lavinthal

S/P=If cannot follow:

LOW(lower suit)

HIGH(higher suit)