This conventions guarantee 7/8 tricks in a solid minor suit and excludes honors like A or K or 2Q in other suit, also any 4 cards in other suit and do not allow void in the hand.
Operner Responder
3nt <=
AKQxxxx(x) or
AKQxxxx(x)Examples of 3nt opening in any position are?
a)
xx
xx
xx
AKQ9832 <= 7 solid
tricks b)
x
xxx
xx
AKQ98432 <=
8 solid tricksc)
xx
xx
AKQJ432
xx <= 7 solid
tricks d)
x
xxx
AKQ108642
xx <= 8
solid tricksAfter 2nt opening Responder bids:
Opener Responder
3nt pass <= accept to play 3nt with all risks
4
<= sign-off Opener pass or correct to 44
<= asking for singleton and Opener bids:4
<= singleton in
Hearts4
<= singleton in
Spades4nt <= singleton in the other minor
5
/5
<= denies singleton 7222 distribution4
<= to play - Responder has solid suit in Hearts4
<= to play = Responder has solid suit in Spades4nt <= asking if the suit is 7 or 8 cards and Opener bids:
5
<= with 7
solid Clubs suit6
<= with 8
solid Clubs suit5
<= with 7
solid Diamonds suit6
<= with 8
solid Diamonds suit5
<= to play or correct5
<= to play (knowing that Diamonds is the Opener suit)6
<= to play or correct6
<= to play (knowing that Diamonds is the Opener suit) Note1: this convention give advantage in allow a transfer to declarer hand play in the solid minor suit of his partner keeping save his King or AQx to receive the lead.
DEFENDING AGAINST GAMBLING 3NT
Opener We
3nt double - play in 3 suits 15+ hcp hand 5431 or 4441 or 4432
4
/4
good 6+ cards and 15+ hcp may have 2 cards in a major4
/ 4 <= to playpass and after opponent stop in a minor then double shows weak distributional takeout for both majors 5/4 or 5/5 and partner decide
Note2: If they stop in 3nt the preference lead is ace to see dummy
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