Two Over One System Notes

1m – 2m: inverted minor 1m – 2H: mixed raise or 16+ HCP balanced 1m – 2S: reverse flannery, Inv. 9–11 HCP 1m – 1NT 2NT: artificial GF. 3C asking. 3NT=18–19; o.w. Shortness

1D 4+ D, deny M if < GF. 1M = 1H/S 4+ M 2M 12–14 HCP, 4 M or minimum 3 M with shortness. Responder uses Spiral to check. 3M 15–17 HCP, 4 M with or without shortness 3M+1: asking. 4-level response showing: 1. Void in m or M, relay to ask. Then 2-level resp to show void in om or oM 2. Singleton in om 3. Singleton in oM 4. No shortness 2NT 18–19 HCP, may have 4 M 3C is Wolff signoff 3D is GF checkback 4M Shape hand, to play < 16 HCP (3/4) oM or 4om Splinter 4m 16+ HCP, 6 m + 4 M 1m 1S – 3H: splinter in H, inv. 1C 1H – ?   1S: does not promise unbalanced 1NT: denies 4 S 1NT 6–10 HCP, balanced. 2NT: artificial GF 3C: asking 3NT: 18–19 HCP 3D: long C, singleton in D (om) 3H/S: long C, singleton in H/S 2D/H/S: reverse 54 3D/H/S: 6 C + 5 D/H/S, GF 3NT: 18–19 HCP 2C Inv+ (10+ HCP), 5+ C, force to 3C 2D/H/S 5C + 4D/H/S 2NT Forcing one round (incl 18–19 bal) 3X: shortness (<15 HCP) 3C Min. Unbalanced. 3D/H/S Splinter, non-minimal 4C Optional minorwood 4D/H/S Excluded RKC 2D* Reverse flannery (S5+H4+, S≥H). Weak < 8 HCP. 2H* Mixed raise 7–9 HCP in C (caseA) OR 15+ balanced hand (caseB), both deny M 1C 2H* – ? 2S* Asking (unbalanced) 3C Mixed raise in C (caseA) 2NT 16+ HCP, balanced, GF 3C: 6+ C, slam interest 3D/H/S: shortness 2NT 12–14 HCP, balanced. Pass or 3C (caseA) 3NT/4NT (caseB) 3D/H/S 6 C + 5 D/H/S. GF 3NT 18–19 balanced. 4C Optional minorwood 2S* Reverse flannery (S≥H). Shape Inv. 2NT Inv. 11–12, balanced, deny M 3C: NF 3X: shortness 3C Weak raise 3D/H/S Splinter in C (15–17 HCP) 3NT 13–15 HCP, balanced, deny M

1M = 1H/S 4+ M. Similar to 1C 1M. Spiral 1D 1H – 1S does not promise unbalanced 1NT 6–10 HCP, balanced. 2NT: artificial GF 3C: asking 3D: 5D4C 3H/S/NT: long D, singleton in H/S/C 3C: GF 5–5 3NT: 18–19 HCP 2C GF (default 5 C) 1D 2C – ? 2D5+ D 2H/S4 H/S, deny 5 D 2NTBalanced 3C4+ C 3DGood D, good hand 3H/SC fit, splinter 2D Inv+ (10+ HCP), 4/5+ D, force to 3D 2H/S/3C5 D + 4 H/S/C 2NT Forcing one round (incl 18–19 bal) 3X: shortness 3DMin. 3H/S/4CSplinter, non-minimal 4DOptional Minorwood 4H/S/5CExcluded RKC 2H* Mixed raise 7–9 HCP in D (caseA) OR 15+ balanced hand (caseB), both deny M 1D 2H* – ? 2S* Asking (unbalanced) 3DMixed raise in D (caseA) 2NT 16+ HCP, balanced, GF 3D: 6+ D, slam interest 3C/H/S: shortness 2NT 12–14 HCP, balanced. Pass or 3D (caseA) 3NT/4NT (caseB) 3C5 C + 5 D GF 3H/S6 D + 5 H/S. GF 3NT18–19 balanced. 4DOptional minorwood 2S* Reverse flannery (S≥H) 9–11 HCP Inv. 2NT Inv. 11–12, balanced, deny M 3C: 2nd suit, NF 3D: to play, NF 3M: shortness, GF 4C: 5–5, slam interest 3DWeak raise 3H/SSplinter in D 3NT13–15 HCP, balanced, deny M

1m – pass – 1M – pass 2M – pass – 2M+1* (asking; all 4 M invitations go through 2M+1) 1st step (2M+2): 3 M + shortness in om. 2nd step (2M+3): 3 M + shortness in oM. 3M-1 (=2M+4): 4 M support, non-min 3M: 4 M support, min 3NT: 4333, 4 M, max 4m: 6 m + 4 M 4om/(3/4)oM: 4 M, shortness 4M: 4 M, max, to play 3X – helper suit with 5 M 3m/3M – GF with 5 M

Good 16+, 5-4 or 4441 The cheapest 2NT or the 4th suit is kind of Lebensohl. Then show an NF hand. Any bids after 2NT/4th suit are GF. 1C – 1S – 2H – ?   2NT*: relay to 3C, then show an NF hand All other biddings incl 2S are GF 1C – 1S – 2D – ?   2H*: relay to 2NT, then show an NF hand All other biddings incl 2S are GF 1C – 1H – 2D – ?   2S*: relay to 2NT, then show an NF hand All other biddings incl 2H are GF

1X   1Y 1NT   ? 2C: relay to 2D, then pass to show weak D or bid to invite 2D: GF. Opener clarify M holding from low to high 2Y: NF 2Z (Z > Y): new suit, GF  (e.g., 1C 1D // 1NT 2H/S showing 5 D + 4 H/S) 2NT: relay to 3C, then pass to show weak C 3X: X fit, GF 3Y: single Y suit, GF 3Z (Z < Y): new suit, GF  (e.g., 1C 1H // 1NT 3D: showing 5 H + 4 D) 3Z (Z > Y): self-splinter, long Y suit, GF  (e.g., 1C 1H // 1NT 3S: H suit + short S) 1X   1Y – 1S – ?   2C/2D/2NT etc. same as above 3S: GF 1C   1D – 1H – ? 2C/2D/2NT etc. same as above 1S: forcing one round (flawed 1NT: no S stopper or not good to declare). < Inv. 1NT: natural 2S: GF 5 D + 4 S

1m (Dbl) ? 2m: 4 support 2/3 om: inv+ 2H/2S: weak, 6+ 2NT: m support weak (4–6) 3m: mixed raise (7–10) 1M forcing 1 round, as if it's non-forcing. Later 2-way check back system on

1S 4+ S, forcing. Opener's 2NT is Artificial GF. 2NT Art. GF 3C Asking 3D5 H + 4 D 3H5 H + 4 C 3S5 H + 3 S 4C/D6+ H, cuebid, deny 3 S 3NT18–19 HCP, balanced 4H6+ H, No extra 3D 7–9 HCP, 6+ good suit 3S4 S, 15–17 HCP 4H<18 HCP, long H 1NT Semi-forcing. pass5332. 12 HCP 2C/D2/3-card. 12–17 HCP 2H6 H, 12–15 HCP. Could be 4522 with good 5 H 2SReverse. 4 S + 5 H 2NT Artificial GF 3C Asking 3D5 H + 4 D 3H5 H + 4 C 3S/4C/D6+ H, cuebid 3NT18–19 HCP, balanced 4H6+ H, No extra 3D7–9 HCP, 6+ good suit 3C/D18+ HCP, GF, 5 H + 5 C/D 3H16–18 HCP, 6+ good suit 3NT16–18 HCP, 6+ solid H 2C 2+ C, general GF 2H6 H 2NTWaiting 3HSemi-solid H. Partner can raise with singleton 2D5+ D, GF 2H3+ H, constructive raise 8–10 HCP 2S4 H + 5 S, fitshowing GF 2NT* 4 H, Inv+ 3C 16+ 3D asking. Response in BLMH: 3H=bal; 3S=C short; 3NT=D short; 4C=oM short 3D Accept inv., more to show. 3H asking. Response in BLMH: 3S=bal; 3NT=C short; 4C=D short; 4D=oM short 3HMinimum. Do not accept inv. 3S/4C/D2nd suit. Source of tricks. 3NT18–19 HCP, balanced 4HNo extra. No shortness After interference: 1M pass 2NT* X: shortness pass: no control, non-min Bid: control + cuebid 3M: not accept inv. 1M – pass – 2NT – pass – 3C/D – pass – 3D/H – X (XX, Pass) show the first two levels in response (D0P1) 3C/DNatural, Inv., usually no fit in H 3HVul: mixed raise Non-vul: preemptive 3SS, weak 3NTSplinter in S (oM) 4C/DSplinter in C/D 4STo play

1NT Semi-forcing. Mostly same as 1H 1NT. 2C2+-card 2D/H4-card suit. 12–17 HCP 2NT Artificial GF 1S – 1NT – 2NT – ? 3C Asking 3D/H5 S + 4 D/H 3S5 S + 4 C 4C/D/H6+ S, cuebid 3NT18–19 HCP, balanced 4S6+ S, No extra 3D/H7–9 HCP, 6+ good suit 3C/D/H18+ HCP, GF, 5 S + 5 C/D/H or 4 with shortness 2C2+ C, general GF 2D/H5+ D/H, GF 2S3+ S, constructive raise 8–10 HCP 2NT*4 S, Inv+. Similar to 1H 2NT 3C/D/HNatural, Inv., usually no fit in S 3SVul: mixed raise Non-vul: preemptive 3NTSplinter in H (oM) 4C/DSplinter in C/D 4HTo play

pass – pass – 1M – pass – ? 2C* Reverse Drury. 3+ card support. Inv. 2DNormal opening. Any new suit afterwards is Inv. 2MLight opening New suitGF. Slam interest 4MTo play 2NT 4+ card support with singleton 3C asking. Response in LMH: 3D=C shortness; 3H=D shortness; 3S=oM shortness

After 1M overcall, 2NT always shows 4 card support, Inv+. 3M after overcall: preemptive (Non-vul) / mixed raise (Vul). 3M after X: weak; mixed raise if jump oM. Cuebid opp's suit = 3 card support, Inv+ Jump cuebid = Splinter Jump new suit = fit-showing Dbl jump new suit = splinter New suits force 1 round. 1H (X) ? XX10+ HCP, no fit. Tend to penalize. New suit after XX is GF. 1NT/2CC/D suit. 6+ HCP. < GF. Partner bids as if non-forcing. 2D3 hearts support. Constructive. 8+ HCP. Unlimited 2HWeak raise. 0–7 HCP 2SMixed raise. 7–9 HCP. 4 hearts support. 2NTLimited raise. 10+ HCP. 4 hearts support 3C/D4 H, fit-showing 3HPreemptive 3NT/4C/DSplinter in S/C/D 1S (X) ? XX10+ HCP, no fit. Tend to penalize. New suit after XX is GF. 1NT/2C/DC/D/H suit. 6+ HCP. < GF. Partner bids as if non-forcing. 2H3 hearts support. Constructive. 8+ HCP. Unlimited 2SWeak raise. 0–7 HCP 3HMixed raise. 7–9 HCP. 4 hearts support. 2NTLimited raise. 10+ HCP. 4 hearts support 3C/D4 H, fit-showing 3SPreemptive 3NT/4C/DSplinter in H/C/D 1H (2H) ? 2SForcing raise in H 2NTC suit, Inv+ 3CD suit, Inv+ 3DLimited raise. 3+ H 3HCompetitive raise 1S (2S) ? 2NTC suit, Inv+ 3CD suit, Inv+ 3DForcing raise in S 3HLimited raise. 3+ S 3SCompetitive raise 1M (2NT) ? — HHLL 1H (2NT) ? 3CH fit, limit raise or better 3DSpades, GF 3HCompetitive raise 3SSpades, Inv. 1S (2NT) ? 3CHearts, GF 3DS fit, limit raise or better 3HHearts, Inv. 3SCompetitive raise

2C Stayman 2D No 4 M 2HGarbage stayman. 4/5 H + 4 S. Opener corrects to 2S with 2 H and 3 S 2S 5 S, unbalanced Inv. 2NT is max without S fit. Responder can continue 2nd suit 3S is inv. with S fit. 2NTInv 3C/D5+ C/D, GF 3H/SSmolen 4M5+oM, GF 4CGerber (04)123 4D/HTransfer to H/S 4NTQuantitative 2H 4 H 2S5 S, unbalanced inv. 2NT4 S, Inv. 3C/D 5+ C/D, GF 3S: 44 majors 3NT: no fit Others: cuebids in 2nd suit 3H4 H, Inv. 3S*4 H, shortness somewhere. 3NT ask. Response in LMH 4C4 H, quantitative. Then 4D is last train. 4DRKC in H: (14)(30)(2)(2+) 4NTQuantitative with 4 S. 2S 4 S 3H*4 S, shortness somewhere. 3S ask. Response in LMH 4C4 S, quantitative. 4DRKC in S: (14)(30)(2)(2+) 4NTQuantitative. 2D Transfer to H 2S (2M+1) Superaccept, max, 4+ support 2NT (for S)/3C: 2nd suit 3D (3M-1): re-transfer 4X (3S): shortness 3HNuisance superaccept (non-max, good shape, 4+ support) 1NT / 2D / 2H / 2S = 54 Inv.    1NT / 2D / 2H / 4H = mild slam interest, bal. 2H Transfer to S 2NT (2M+1) Superaccept, max, 4+ support 3C/D: 2nd suit 3H (3M-1): re-transfer 4X: shortness 3SNuisance superaccept (non-max, good shape, 4+ support) 1NT / 2H / 2S / 3H = 55 GF    1NT / 2H / 2S / 4S = mild slam interest, bal. 2S Range asking or 6+ C 2NT Min 3CC, to play 3D/H/SShortness 4COptional minorwood 3CMax. Same as above. 2NT D (any strength), or D+C (usually weak) 3C Better C than D 3DD, to play 3H/S/4CShortness, a single D suit GF 3NT6+ D, mild slam interest (14–15 HCP) 4D6+ D, optional minorwood 3DBetter D than C. Same as above. 3C Least-Info Puppet Stayman 3D No 5 M 3H/S4 oM 3NTTo play 4mMinor suit, optional minorwood 3H/S 5 card H/S 3/4 oMSet trump, slam interest 3NTTo play 4mMinor suit, optional minorwood 3D 5–5 minors, GF 3H/SC/D fit 3NTNo fit 4C/DGood C/D fit, shortness 3H 31(54), GF 3NT: to play 4m: 4 card support 4H (singleton): max, ask partner to bid longer minor 4S: C KC 4NT: D KC 4S: to play 4NT: min, ask partner to bid longer minor 3S 13(54), GF 3NT: to play 4m: 4 card support 4H: to play 4S (singleton): max, ask longer minor 4NT: 2-suit KC (14)(03)(2+0Q)(2+1Q)(2+2Q) 4NT: min, ask partner to bid longer minor 3NTTo play 4CGerber: (04)-1-2-3 4D/HTexas transfer to H/S 4SPick a minor < 8 HCP. 65+ 4NTQuantitative 5C/DTo play

3C Muppet Stayman 3D One or two 4-card major 3H/S4 card oM 4DBoth Majors 3H No 4 or 5 card major 3S: 5 S + 4 H GF 3S5 S 3NT 5 H 4CH fit, slam interest 4DTransfer to 4H 4H/SNo H fit, C/D suit 3D/H Transfer H/S suit 2NT – p – 3D – p – 3H – p – 3S: 5 H + 4 S 2NT – p – 3H – p – 3S – p – 4H: 5 H + 5 S 3S Minor suit, slam interest. Relay to 3NT, then: 4C/DSingle C/D suit. Optional minorwood 4H/SShortness. Both minors. 4NT/5C/5D: to play

A single 7+ card suit with AKQJ 4CPass or correct 4D Ask singleton 4H/SH/S singleton 4NTNo singleton 5C/DOther minor singleton 4H/S/5DTo play 4NT/5NTBid slam with 8 card suit

1NT (2C) ? If (2C) = two majors: X: defensive, tend to penalize 2D: to play 2H/2S: C/D, inv+ 3C/3D: C/D, weak 2NT: minors, competitive+ 3H/3S: shortness (usually minors) GF If (2C) = other artificial, or C suit:   X: stayman System on 1NT (2D) ? If (2D) = an unspecific suit:   X: values Pass then X: negative Lebensohl on. If (2D) = two majors, see 1NT (2C). 1NT (2M) ? — (2M) is a real suit. Lebensohl. X: negative 2S (if M=H): sign off 3S (if M=H): GF 3C/D/(3H if M=S): GF 2NT forces partner to bid 3C pass: long C, weak 3C/D/(3H if M=S): sign-off 3S (if M=H): invitational 3M: 4 card oM, GF, no stopper 3NT: 4 card oM, GF, with stopper 3M: shortness, GF, minors 3NT: to play. half-stopper+ 4D/H: Texas Transfer (off when opp compete at 3D or above) 1NT (Dbl) ? If (Dbl) = penalty: System on XX: force pd to bid 2C; usually have one minor pass: to play If (Dbl) = artificial: System on XX: show values

After Stayman — Opponent doubles 2C (assuming club lead directing) 1NT (p) 2C (X) – ? 2M: has stopper in clubs. Ignore X, system on. Pass: No stopper in C. Major holding unknown. 1NT (p) 2C (X) – pass (p) – ? 2D: 3-suit garbage Stayman. Opener bids major if having one 2H: 2-suit garbage stayman (H+S) 2S: 5 spades unbalanced inv. 3H/S: Smolen XX: re-stayman. Invitational+ 1NT (p) 2C (X) – pass (3C) – ? X: stayman. Invitational+ 3D: 5 S, unbalanced Inv. 3H/S: Smolen After Transfer — 1NT (p) 2D/H (X): ? Pass: 2-card in responder's M 2H/2S: 3-card support XX: 3-card support, Max 1NT (p) 2D/H/S (X) – pass (p) – ? XX: re-transfer. New suit after XX is forcing. New suit directly: competitive

2D Positive, waiting. Min is K&J 2H* Relay to 2S. Then transfer Kokish 2NT25+ HCP. Response same as 2NT opening 3C 5 H + 4 D 3D: good D fit 3H: good H fit 3D 6 H 3H: good H fit, like non-serious 3S/4C/D: H fit, cuebid 3H 5 H + 4 S 3S: good S fit 4C/D: good H fit, cuebid 3S5 H + 4 C Responder can break relay: 2NT/3C/D = C/D/S 3H = C+D 2S/3C/3DSingle suit 2NT22–24 HCP. Same as 2NT opening 3H/S4 H/S + 5 D 2H Busted hand, max is 2 Q's 2NT22–24 HCP. Same as 2NT opening 3NT 25+ HCP 4C: Stayman 4D/H: Transfer 2S/3C/3D 6-card suit with 2 of AKQ

Direct Seat: (1X) 1NT: 15–18 HCP with X stopper (1X) 1NT (pass) ? system on (2X) 2NT (pass) ? 3C: Regular stayman 3D/3H: Transfer 4D/H: Texas Transfer Balanced Seat: (1m) pass (pass) ? 1NT: 11–14 HCP X and then NT: 15–17 HCP 2NT: 18–20 HCP (1m) pass (pass) 1NT: System on (2X) pass (pass) 2NT: Regular Stayman, same system as (2X) 2NT

4m: optional minorwood in the bidding suit m Response: 4m+1: no interest; then 14 – 30 – 2w/oQ – 2w/Q If response shows trump Q: +1 level is specific king asking If response does not show trump Q: +1 level is trump Q asking; +2 level is specific king asking Applies in the following sequences: 1m – 2m/(2m+2) – 4m 1m – 2m – 2NT/3m – 4m* 1NT – 2S – 2NT/3C – 4C* 1NT – 2NT – 3C/3D – 4D* 2NT – 3S* – 3NT – 4m*

(1M) 2M = m + oM    (1M) 2NT = minors    (2M) 4m = m + oM    (3M) 4m = m + oM (1M) P (2M) 4m = m + oM    (1M) P (3M) 4m = m + oM (1m) 2m = Majors    (1m) 2NT = two lower suits (2D) 3D = Majors    (3D) 4D = Majors    (2D/3D) 4C = C + M (partner bids 4D to ask) (3C) 4C = Majors    (3C) 4D = D + M (partner bids 4H as p/c)

(1M) 2M (p) ? — 2M shows 5 oM + 5 m 2NTAsk minor 3CPass or correct 3DGood fit in oM 2/3 oMTo play (1m) 2m (p) ? — 2m shows 5–5 majors 2D/H/STo play 3H/SMixed raise 3C/DGood fit in H/S 2NT Asking range and shape. Inv+ 3C5–5 min 3D5–5 max 3H5 S + 6 H max 3S6 S + 5 H max (1M) 2NT (p) ? 3C/DTo play 3HGood fit in C 4C: to play 3SGood fit in D 4D: to play

(1m) X (1H) ? Jumps are preemptive 2m (low cue) = good hand with om 2H (high cue) = good hand with S X = hearts, constructive+ (1m) X (1S) ? Jumps are preemptive 2m (low cue) = good hand with H 2S (high cue) = good hand with om X = spades, constructive+ (1H) X (1S) ? Jumps are preemptive 2H (low cue) = good hand with C 2S (high cue) = good hand with D X = spades, constructive+ Curly cuebid also applies in (1x) P (1y) X (p) ? (1NT) ? XShow values 16+ HCP 2C Two majors (54) 2DPick a major 2H/STo play 3H/SCompetitive 2NT All invitations go through 2NT 3C 5–4 or 4–5 min 3D: bid your 5 card suit 3H: 4 H, to play 3S: 4 S, to play 3D5–5 min 3H4 S + 5 H, max 3S5 S + 4 H, max 3NT5–5 max 2DOne major 2H/S 5 H/S + 4+ m 3CPass or correct 3DGood raise in M 3H/SCompetitive 2NT Constructive+ 3C/DC/D, min 3H/SC/D, max 2NTTwo minors 3C/DSingle C/D suit

(1C) ? X2 suits of the same color (red HD or black SC) 1DH 1HS 1S2 suits of the same rank (majors or minors) 1NT2 suits of the same shape (rounded HC or pointed SD) 2XNatural (1C) p (1D) ? X2 suits of the same color (red HD or black SC) 1HH 1SS 1NT2 suits of the same rank (majors or minors) 2C2 suits of the same shape (rounded HC or pointed SD) 2XNatural

2D = 5 H + 4 S (2D) ? X16+ 2HTakeout. 2S/3C/3DNatural 2NTMinors

2D = any major preempt (2D) ? pass After figuring out the opponent's suit, treat it as a 2M opening. X: takeout 2NT: minors 4m: leaping michael X13–15 Balanced. Or bid suit afterwards to show 16+ HCP 2H/S5 card natural 2NT15+–18 HCP, bal. Strong NT 3H/S6 card suit, good hand.