Jacoby 2NT
This old convention was created by Oswald Jacoby (1902-1984) Sidney Lenz's
partner in the initial FOUR ACES team. Jocoby was selected by Lenz to be
his partner in the famous match Culbertson-Lenz in 1931. Jacoby made many
system inovation as the Transfer for major after 1nt open.
This convention receive modifications and now is a standard with the follow rules:
Rule#1:
2nt Jacoby is used by Responder after a open in a major in first or
second position and shows 12-16 hcp with 4+ cards support denying singleton
and asking if Opener have a singleton/void to be bided at level 3.
The responses after 2nt are:
Opener Responder
1
2ST
?
3
/3
/3
=> shows singleton or void in the suit
bided;
3 => strong hand 17-20 hcp - Responde should cuebid
3ST
=> balanced hand with 15-16 hcp
4
=> 5-5
with 2 top honors
(AK/AQ/KQ) in Clubs - 14-16 hcp
4 => 5-5
with 2 top honors
in Diamonds - 14-16 hcp.
4
=> deny singleton/void shows minimum 12-14 hcp
Opener
Responder
1
2ST
?
3/3/3 = > shows singleton or void in the suit
bided;
3
=> strong hand 17-20 hcp - Responder should cuebid
3ST
=> balanced hand with 15-16 hcp
4
=> 5-5
with 2 top honors
in Clubs - 14-16 hcp
4
=> 5-5
with 2 top honors
in Diamonds -14-16 hcp
4
=> 5-5 with 2 top honors
in Clubs - 14-16 hcp
4
=> deny singleton/void shows minimum 12-14 hcp
Rule#2:- After Opener bid his singleton Responder show
extra values bidding
other suit, or jump to game with minimum 12-14 hcp.
Rule#3: If Opener have chance
for rebid his
singleton that shows void, and the bid of another suit shows Opener's extra
values.
**************************************************************
**************************************************************
Another
version of Jacoby 2nt is:
Opener Responder
1 2nt <= Jacoby 4+ cards support 12-16 hcp
3 <= any minimum hand 12-14 hcp - can have singleton
4 <= not interesting if you have singleton
pass
===================================================
Opener
Responder <= Convention Jacoby 2nt for Spades
1 2nt <= Jacoby 4+ cards support 12-16 hcp
3 <= any minimum hand 12-14 hcp - may have singleton
3
<= Do you have singleton?
? Opener bids:
3 <= singleton
3 <= singleton
3nt <= singleton
4 <= no singleton but
A
4
<= no singleton but A
4 <= no singleton but A
4 <= no songleton and no cuebid
Now Responder decide what to do
===================================================
Opener
Responder
1 2nt <= Jacoby 4+ cards support 12-16 hcp
?
3
<= good hand and singleton in
3 <= good hand and singleton in
3 <= good hand 18-19 hcp distribution 5332
3nt <= good hand
and singleton in
4 <= good hand 5-5 (2 top honors) 15+ hcp
4
<= good hand 5-5
(2 top honors) 15+ hcp
4 <= good hand 5-5 (2 top honors) 15+ hcp
4 <= 6 cards with no singleton 15+ hcp
Now Responder decide what
to do
**************************************************************
Opener Responder
1 2nt <= Jacoby 4+ cards support 12-16 hcp
3 <= any minimum hand 12-14 hcp - may have singleton
4 <= not interesting if you have singleton
pass
===================================================
Opener Responder <= Convention Jacoby 2nt for Hearts
1 2nt <= Jacoby 4+ cards support 12-16 hcp
3 <= any minimum hand 12-14 hcp - may have singleton
3
<= Do you have singleton?
? <= Opener bids
3 <= singleton
3 <= singleton
3nt <= singleton
4 <= no singleton but
A
4
<= no singleton but A
4 >= no singleton
Now Responder decide what to do
===================================================
Opener
Responder
1 2nt <= Jacoby 4+ cards support 12-16 hcp
?
3
<= good hand and singleton in
3 <= good hand 18-19 hcp - 5332
3 <= good hand and singleton in
3nt <= good hand and singleton in
4 <= good hand 5-5 (2 top honors) 15+ hcp
4
<= good hand 5-5
(2 top honors) 15+ hcp
4 <= 6 cards with no singleton 15+ hcp
now Responder decide what to
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =
Thus, Jacoby 2nt convention have others versions and so it is necessary have agreements with your partner in select one Jacoby 2nt
convention.
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