1NT

      

Shape Constraints

This text is written for a 12-14NT. This system may be played with other 2 point range balanced hands or even a variable NT - adjust as required.
No singleton allowed.

Note: A 1 opening is prefered to a 1NT opening when holding a 4 card major with good (top honour AKQ ).

There are a number of strict shape constraints:

HCP Constraints

With a Major singleton we allow an opening of 1NT with 13-14 HCP. Your system card must state 'major singleton possible'. with 15+ open 1C & rebid 1N as usual.
With 12 HCP consider PASS seriously.
 
Responses:

BID
HCP
Nature
Responses
Constraint
2C
0+
Forcing, non-promissory
2D 2H 2S only
HS 4 cards
2DH
0+
 Forcing, major transfers
2H2S

2S
(1213)+
Forcing, No 4 card major
2NT...3NT
See Below
2N
+/- 12
Invitational
Pass3NT

3NT
13-15
To play. No major
Pass
Flat hand
3suit
16+
Forcing, 6+ card suit
Trump request

4CD
game values
Forcing, major transfers
4H4S
4HS

Distributional raises




PASS with (7)-(10) HCP

Continuations:

1NT-2C!-2D!HS:
Pass:            to Play
3C3D:         to Play 6+ card suit, 0+ HCP
HS-23 no jump:          6 card suit. WEAK

2NT3NT:    to Play

1NT-2C!-2HS:
3HS:             Invitational
4HS:             To Play
2N:                Offers choice of 3S or PASS
3N:                Offers choice of 4S or PASS
1N-2C!-2D:  2Ma to play; 3Ma invitational; 2N limit; 3N to play; PASS to play; 3C to play

1NT-2S: (12)+HCP Denies a 4 card major categorically however 2N or 3N may be better bid with good  guards in both Majors

3C:           Lowest 4 Card minor - Diamonds are 3 or 4 cards - no 5 card minor
3D:          Clubs are Hxx precisely
2NT:        12(13)HCP: with 5 card minor continuations:
3NT:            To Play c14HCP Maximum guards in both major  (rare needs guards in both majors)

1NT-2D-2H: or 1NT-2H-2S: Either weak 5 card suit or a 6 card with probable 9 tricks. Responder may raise to 3 of his major - invitational with the latter. Use NP 2C with a weak 6 card major. If responder offers game by raising bid 4 with a max or excellent cards (A's & K's rather than Q's & J's
If responder now bid another suit h is asking help.
1NT-RST-2N show singleton in responder's Major

1NT-2NT limit Opener may bid game or Pass
1N-3N To play