1N CS Openings

Strengths in Mode 0:

NV: 10-13
V: 14-16

May have 5-card major or 6-card minor

2♣
Puppet to 2♦. “5+♦ any strength, both minors GF, or a major invite”
- (1)
  Weak in ♦
- (2)
  Inv with long ♦
- (3)
  Long ♦ SI
- (4)
  5+♦ 4=M GF
- (5)
  5+4+ minors GF
- (6)
  Three suited short M SI, or
- (7)
  4-5M inv (not 4-card flat)
2♦
Trans to 2♥. 5+♥. Include 5-5 majors inv and 5+♥ 4=♠ GF
2♥
Trans to 2♠. 5+♠. Not 5=♠ inv
2♠
Size ask.
- (1)
  Bal inv (may have a 4-card major if flat)
- (2)
  Bal SI, or
- (3)
  Inv with long ♣
2N
Trans to 3♣
- (1)
  Weak in ♣
- (2)
  5+♣ 4=M GF, or
- (3)
  Long ♣ SI
3♣
5+♠ 4=♥ GF
3♦
4=♥ 4=♠ GF
3M
4=M COG. Usually 3-oM. May pull to 5m after 3N
3N
To play
4♣/♦
Long ♥/♠ GF+
4M
To play
4N
Quantitative

2♣ Puppet to 2♦

1N - 2♣; 2♦

P
Weak with ♦
2M
4-5M inv. Not 4333 or 4432. Keri
2N
5+♦ GF (not both m)
- 3♣
  Ask
  - 3♦
    5+♦ 4=♥ GF
  - 3♥
    5+♦ 4=♠ GF
  - 3♠+
    6+♦ SI
3♣
5+4+ minors GF.
- 3♦
  Ask
  - 3♥
    Short ♠. 5+4+ minors ST.
    3♠
    Ask better minor (3N=♦, 4♣=♣)
  - 3♠
    Short ♥. 5+4+ minors ST.
    3N
    NF
    4♣
    Ask better minor (4♦=♦, 4♥+=♣ and cue)
    4♦
    Fit ♦
    4♥+
    Fit ♣. Cue
  - 3N
    5-4 minors NF. 5422 or stiff honor. 4♣ ask better minor
  - 4m
    6m 4=om
  - 4♥/♠
    6+♣/♦ 5+om
- 3♥/♠
  Fit ♣/♦
- 3N
  To play
3♦
Long ♦ inv
3M
Three suited. Short oM

Majors Invite (Keri)

1N - 2♣; 2♦ - 2M

P
Min. 3=M
2♠
Min. 2=♥ 4-5♠
2N
Min. 2=M
- 3m
  5+m to play
- 3♥
  (After 2♠) 5=♠ 4=♥
3m
4=M. Help suit game try in m
3♥
Art. Max 4=oM. May have 3=M
- 3♠
  5=M
- 3N/4oM
  To play
3♠
Art. Max 3=M COG (or dispersed strength with 4=M)
3N/4M
To play

2♦/♥ Transfers

Normal Accepts

1N - 2♦/♥; 2M

2♠
5-5 majors inv+ or 5+♥ 4=♠ GF. 2N ask, then
- 3♣
  5+♥ 4=♠ GF. Continue like 1N - 3♣
- 3♦
  5+♥ 5+♠ GF. Natural continuation
- 3♥
  5-5 majors inv
2N
Art. 5+M 4+♣ GF
- 3♣
  Ask
  - 3♦
    5+♣. 3♥ Ask Hi / lo short
  - 3♥/♠/N
    4=♣. Hi / lo / no short
3♣
Art. 5+M 4=♦ GF. 3♦ ask short (hi / lo / no)
3♦
Art. 5+M 5+♦ GF. 3♥ Ask Hi / lo short
3M
6+M Inv
3N
5=M COG. Disperse values. 3N is still possible even with fit
3oM/4♣+
Long M ST

Super Accepts

1N - 2♦/♥

2M
Normal Accept
2N
Max. 4+M. No weak doubleton
Suit
Max. 4+M. Weak doubleton in suit
3M
5=M

After super accepts, no re-transfer except n immediate 4♦ / 4♥.

2♠ Size Ask

1N - 2♠

2N
Min
- 3♣
  Was long ♣ inv
- 3♦
  Confit
- 3N
  To play
3♣
Max
- 3♦
  Confit
- 3M
  4=M. Was bal inv. Then 3♠ is Nat.
- 3N
  To play, either bal inv or long ♣ inv

Confit

Responder has a balanced hand, investigates the number of controls and a fit for a slam.

1N - 2♠; 2N/3♣ - 3♦

3♥
2-3 controls
- 3♠
  Ask again
  - 3N
    2 controls
  - 4♣
    3 controls, 4+ suits. Bid up the line
- 3N
  To play
- 4♣+
  4+ suits. Bid up the line
3♠
4 controls
3N
5 controls
4♣+
6+ controls. 4+ suit. Bid up the line

Then the development follows the following rules:

Any time the responder rebids NT, the opener must pass
The opener must not raise the level unless fitting
Both players bids suits up the line, rebidding shows 5
Fit partner by a raise

2N Transfer to 3♣

1N - 2N; 3♣

P
Weak ♣ to play
3♦
5+♣ 4=♥ GF
3♥
5+♣ 4=♠ GF
3♠+
6+♣ SI

3♣ 5+♠ 4=♥ Game Force

1N - 3♣

3♦
Ask
- 3♥/♠
  hi / lo short
- 3N
  5422
- 4m
  6+♠ short m
3M
Fit
3N
Not interested in a major

3♦ 4-4 Majors GF

1N - 3♦

3M
Fit M. Not the worst hand
- 3N
  Disperse values. MST
- 3m
  Shortness. ST
- 4M
  To play
3N
NF
4m
Double fit. Cue
4M
Fit M. NF

Modules

Major-Minor Game Forcing

After responder shows 5M 4+m after 1N - 2♦/♥; 2♥/♠ - 2N/3♣/3♦; shape ask, opener can continue as follows

5+M 4+m continuation

4m
SI in m.
4om/oM
SI in M. Cuebid
3N/4M/5m
NF

After responder shows 4=M 5+m, opener can continue as follows

5+m 4=M continuation

3M
Fit M. May have m fit
3N
No fit. NF
3♠/4m
Fit m.

Long Suit Slam Tries

After a transfer to a suit, responder can initiate long suit ST by bidding 3♠ (or 3♥ after ♠), 3N in a minor, or 4-level bids.

Long suit slam tries (Major) and continuation

3oM
ST. No short (may have singleton Ace / King)
- 4M
  Negative
- 3N
  Ask weak doubleton (worse than Jx)
  - 4m
    m
  - 4M
    oM
  - 4N
    No
4X
Splinter
4M
Mild ST. NF
4N
RKCB

Long suit slam tries (Minor) and continuation

3♠
ST. No short (may have singleton Ace / King)
- 3N
  Negative
- 4m
  Nat ST
- 4om
  Ask weak doubleton (worse than Jx)
  - 4♦ / 5♣
    (Original suit) om
  - 4M
    M
  - 4N
    No
3N
Mild ST. NF
4m
(Responder’s suit) Kick back RKCB
4X
Splinter

1N Contested Auction

1N (Dbl)

P
Ask for a 5-card suit. May be a strong hand
- P
  No 5-card suit. To play
- Rdbl
  Have a 5-card suit.
  - P
    To play 1N redoubled
  - 2♣
    Weak. P/C
Rdbl
A 5+card suit. Puppet to 2♣, then P/C
2♣/♦/♥
4+4+ in the suit bid and a higher suit. P/C
2♠
GF. 5+5+ in ♠ and another suit. 2N asks for the second suit
2N
GF. 5+5+ minors
3m
GF. 5+♥ 5+m
Higher
System on

1N (P) P (Dbl)

P
No 5-card suit
Rdbl
A 5+card suit. Max. Then 2♣ P/C
2X
5+X. Min.

1N (2X)

Lebensohl. Slow Show.
Unusual vs unsusual if two known suits (4+4+) has been shown
Dbl
Take out if nat. Suit-showing if art
4♣/♦
Long ♥/♠ GF
4M
To play even if it is their suit

1N (2N=Minors)

Dbl
Values. Further Dbls are penalties
3♣/♦
5+♥ / 5+♠. GF
3M
Nat. 6+M. Constructive. NF

1N (3X)

Refer to Against Preempt or Raise

1N, then opponent doubles responder’s puppet / asking bid

P
No stopper (Responder double to re-puppet)
Rdbl
Max with length in the doubled suit
Complete / answer
Stopper

1N, then opponent doubles responder’s transfer bid

P
No fit (Responder double to re-puppet)
Rdbl
Max with length in the doubled suit
Complete
Fit