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1♣: 17+HCP bal or 15+HCP unbal
- 1♦: 0-8(9) HCP
  - 1♥: 1) 15-18 w/5+♥ 2) Many unknown 19+hands
    - 1♠: Relay - asking
      - 1NT: 19-20, bal
      - 2♣: Any 22+unbal or any 23+bal
        
        2♦: Denying a 5+crd suit
        
        2♥: 1) ♥ or 2) 25+ bal
        
        2♠: Relay - asking
        
        2NT: 25+hcp
        
        3♣: 5+♥ & 4+♣
        
        3♦: 5+♥ & 4+♦
        
        3♥: 6♥ (One suiter)
        
        3♠: 5+♥ & 4+♠
        
        4♣: Slam try w/ ♥ support
        
        4♦: Slam try w/ ♠ support
        
        3NT: 25-26NT (very often no MA)
        
        2♠: 4+♠ (longer mi poss)
        
        2NT: 23-24
        
        3♣: 5+crd (Denying 4-crd ♠)
        
        3♦: 5+crd (Denying 4-crd ♠)
        
        3♥:
        
        3♠:
        
        3NT:
        
        2♥: 6-8, 4+♥ (longer mi poss)
        
        2♠: 6-8, 4+♠ (longer mi poss)
        
        2NT: (Don't excist)
        
        3♣: 6-8, 5+crd (no 4-crd major)
        
        3♦: 6-8, 5+crd (no 4-crd major)
      - 2♦: 15-18, 5+♥ & 4+♦
      - 2♥: 1) 6+♥, 15-18 or 2) 5+♥ & 4+♣, 15-18
      - 2♠: (18)19-21, 3-suiter w/4-5♥ (denying 4♠)
        
        2NT: Relay - asking
        
        3♣: Unknown 3-suiter w/4-crd ♥-suit
        
        3♦: Asking
        
        3♥: 3451
        
        3♠: 3415
        
        3NT: 1444 or 0XXX
        
        3♦: 1453 or 1435
        
        3♥: Asking
        
        3♠: 1453
        
        3NT: 1435
        
        3♥: 3541
        
        3♠: 3514
        
        3NT: 1534 or 1543
        
        3♣: p/c
        
        3♦: p/c
        
        3♥: To-play
        
        3♠: Unknown singleton w/4+♥
        
        3NT: Void in ♠, 4+♥
        
        4♣: Void, 4+♥
        
        4♦: Void, 4+♥
        
        4♥: To-play
      - 2NT: 21-22, bal
      - 3♣: 5+♥ & 5+♣, 17-18
      - 3♦: 5+♥ & 5+♦, 17-18
      - 3♥: Strong ♥-suit, 17-18
    - 1NT: 5+♣, 0-5
    - 2♣: 5+♦, 0-5
    - 2♦: 5+♥, 0-5
    - 2♥: 5+♠, 0-5
    - 2♠: 5+♠ & 5+in-a-minor, 5-8
    - 2NT: 5+♥ & 5+in-a-minor, 5-8
    - 3♣: 5+♣ & 5+♦, 5-8
    - 3♦: 5+♥ & 5+♠, 5-8
  - 1♠: 15-22, 4+♠
    - 1NT: (3)4-5
      - 2♣: 5/4 either way, 15-19
      - 2♦: 5/4 either way, 15-19
      - 2♥: 5/4 either way, 15-19
      - 2♠: 15-19, 6+♠
      - 2NT: 20-22, often bal
        
        3♣: Stayman-ish
        
        3♦: Transfer, 5♥
        
        3♥: "Transfer", 3♠ (not 4 or 5 ♥)
      - 3♣: 20-22, 5+♣
      - 3♦: 20-22, 5+♦
      - 3♥: 20-22, 5+♥
      - 3♠: 6+♠
    - 2♣: 6-8, 0-2♠ (denies 5♥)
      - 2♦: Weak relay (often 15-17)
        
        2♥: 4♥
        
        2♠: 2♠ (not 4♥)
        
        2NT: Not 4♥ and not 2♠ (often 1-3-X-X)
        
        3♣: 6-crd
        
        3♦: 6-crd
      - 2♥: 5+♥
      - 2♠: 6+♠
      - 2NT: Strong relay (18+), often bal
      - 3♣: 5+♣, 18+hcp
      - 3♦: 5+♦, 18+hcp
      - 3♥: 5+♥, 18+hcp
      - 3♠: 6+♠, 18+hcp
    - 2♦: 6-8, exactly 3♠
    - 2♥: 6-8, 5♥ (denies 3♠)
    - 2♠: 3-5, 4+♠
    - 2NT: 5♣/5♦, 6-8hcp (0-2♠)
    - 3♣: HHxxxx
    - 3♦: HHxxxx
    - 3♥: 6-8, 6♥ & 3♠
    - 3♠: 6-8, 4+♠ (no singleton)
    - 3NT: Unknown singleton w/4+♠
    - 4♣: Void, 4+♠
    - 4♦: Void, 4+♠
    - 4♥: Void, 4+♠
    - 4♠: Many trumps (No singleton or void)
  - 1NT: 17-18
    - 2♣: Stayman
    - 2♦:
    - 2♥:
    - 2♠: Weak with either minor
    - 2NT:
    - 3♣:
    - 3♦:
  - 2♣: 15-18, 5+♣, unbal (denying 4♠)
    - 2♦:
      - 2♥:
      - 2♠: Singleton♠
      - 2NT:
      - 3♣:
      - 3♦: Singleton♦
    - 2♥:
    - 2♠:
    - 2NT:
    - 3♣:
    - 3♦: Singleton♦ w/good ♣ supp.
    - 3♥: Singleton♥ w/ good ♣ supp.
    - 3♠: Singleton♠ w/ good ♣ supp.
  - 2♦: 15-18, 5+♦, unbal (denying 4♠)
    - 2♥:
      - 2♠: 4♥
      - 2NT:
      - 3♣: 4+♣
      - 3♦:
    - 2♠:
    - 2NT:
    - 3♣:
    - 3♦:
    - 3♥: Splinter
    - 3♠: Splinter
    - 4♣: Splinter
  - 2♥: (18)19-21, 5+♥, unbal (denying 4♠)
  - 2♠: (18)19-21, 6+in-a-unknown-mi (denying 4crd MA)
  - 2NT: (18)19-21, at least 5-4 in mi
    - 3♣:
    - 3♦:
    - 3♥:
    - 3♠:
  - 3♣: (18)19-21, (5)6+♣ & 4♥
    - 3♦: Relay
      - 3♥:
      - 3♠:
      - 3NT:
    - 3♥:
    - 3♠:
    - 3NT:
  - 3♦: (18)19-21, (5)6+♦ & 4♥
  - 3♥: Solid or semi-solid suit (18-20)
  - 3♠: Solid or semi-solid suit (18-20)
  - 3NT: Often solid minor with side stoppers
- 1♥: 1) 5+♥ OR 2) bal-hand
  - 1♠: Relay - asking
    - 2♣: Bal
      - 2♦: Stayman-ish
        
        2♥: 4-5♥, Bal
        
        2♠: 4♠ (denying 4♥)
        
        2NT: Any 4-4-4-1 hand w/ singleton A or K
        
        3♣: Relay
        
        3♣: x-x-4-4
        
        3♦: 5♦332 type
        
        3♥: 5♣332 type
        
        3♠: 3-3-3-4 or 3-3-4-3, 9-12
        
        3NT: 3-3-3-4 or 3-3-4-3, 13-14
        
        4♣: 3-3-3-4, 15+
        
        4♦: 3-3-4-3, 15+
    - 2♦: 5♥ & 4♦
    - 2♥: 5♥ & 4♣
    - 2♠: 5♥ & 4♠
    - 3♣: 5♥ & 5♣
    - 3♦: 5♥ & 5♦
    - 3♥: 6♥ (one suiter)
    - 3♠: 6♥ & 5♠
  - 1NT: Often 17-18 bal
  - 2♣: 6♣
  - 2♦: 6♦
  - 2♥: 6♥
  - 2♠: 6♠
  - 3♣: Strong 7-crd suit (one suiter)
  - 3♦: Strong 7-crd suit (one suiter)
  - 3♥: Strong 7-crd suit (one suiter)
  - 3♠: Strong 7-crd suit (one suiter)
- 1♠: 5+♠
  - 1NT: Not necessarily bal.....but probably no 6-crd suit ;-)
  - 2♣:
  - 2♦:
  - 2♥:
  - 2♠:
  - 2NT: 4+crd ♠ support (Bekkasin)
  - 3♣: Mini-Splinter
  - 3♦: Mini-Splinter
  - 3♥: Mini-Splinter
  - 4♣: Voidwood
  - 4♦: Voidwood
  - 4♥: Voidwood
- 1NT: 5+♣
  - 2♣: Waiting
    - 2♦:
    - 2♥:
    - 2♠:
    - 3♣:
    - 3♦: Mini-Splinter
    - 3♥: Mini-Splinter
    - 3♠: Mini-Splinter
  - 2♦:
  - 2♥:
  - 2♠:
  - 3♣:
- 2♣: 5+♦
  - 2♦: Waiting
    - 2♥:
    - 2♠:
    - 3♣:
    - 3♦:
  - 2♥:
  - 2♠:
  - 3♣:
  - 3♦:
- 2♦: Multi (Weak-Two in a major) 6-8hcp
- 2♥: Any 4-4-4-1 hand (unknown singleton)
  - 2♠:
    - 2NT: Single ♠
      - 3♣: Control ask w/♣ support
        
        3♦: 0-2 controls
        
        3♥: 2 controls (2 kings)
        
        3♠: 3 controls
        
        3NT: 4 controls
        
        4♣: 5 controls
        
        4♦: 6 controls
      - 3♦: Control ask w/♦ support
        
        3♥: 0-2 controls
        
        3♠: 2 controls (2 kings)
        
        3NT: 3 controls
        
        4♣: 4 controls
        
        4♦: 5 controls
      - 3♥: Control ask w/♥ support
        
        3♠: 0-2 controls
        
        3NT: 2 controls (2 Kings)
        
        4♣: 3 controls
        
        4♦: 4 controls
        
        4♥: 5 controls
        
        4♠: 6 controls
    - 3♣: Single ♣
      - 3♦: Control ask w/♦ support
      - 3♥: Control ask w/♥ support
      - 3♠: Control ask w/♠ support
    - 3♦: Single ♦
      - 3♥: Control ask w/♥ support
      - 3♠: Control ask w/♠ support
      - 4♣: Control ask w/♣ support
    - 3♥: Single ♥
      - 3♠: Control ask w/♠ support
      - 4♣: Control ask w/♣ support
      - 4♦: Control ask w/♦ support
- 2♠: Any 5-4-4-0 hand (unknown void)
  - 2NT: Relay - asking
    - 3♣: X-X-X-0 type
    - 3♦: X-X-0-X type
    - 3♥: X-0-X-X type
    - 3♠: 0-X-X-X type
- 2NT: Preempt in ♣
  - 3♣:
    - 3♦:
      - 3♥: Control ask w/♥ support
      - 3♠: Control ask w/♠ support
      - 4♣: Control ask w/♣ support
    - 3♥:
      - 3♠: Control ask w/♠ support
      - 4♣: Control ask w/♣ support
      - 4♦: Control ask w/♦ support
    - 3♠:
      - 3NT: Nat.
      - 4♣: Control ask w/♣ support
      - 4♦: Control ask w/♦ support
      - 4♥: Nat. (not forcing)
      - 4♠: Control ask w/♥ support
    - 3NT: ♣ void (9-12)
      - 4♣: Puppet to 4♦
        
        4♦: Forced!
        
        4♥: Nat. (not forcing)
        
        4♠: Nat. (not forcing)
      - 4♦: Control ask w/♦ support
      - 4♥: Control ask w/♥ support
      - 4♠: Control ask w/♠ support
    - 4♣: 13+
      - 4♦: Control ask w/♦ support
      - 4♥: Control ask w/♥ support
      - 4♠: Control ask w/♠ support
      - 4NT: Nat.
- 3♣: Preempt in ♦
- 3♦: Preempt in ♥
- 3♥: Preempt in ♠
- 3♠: Any solid 7+crd suit
1♦: Nebulous 1♦, 11-15 HCP, (Often 11-13 bal)
- 1♥:
  - 1♠:
    - 1NT:
    - 2♣: 4th suit
    - 2♦:
    - 2♥:
    - 2♠: Usually 4♠ spades
    - 2NT:
    - 3♣: 5♥ & 5♣
    - 3♦:
    - 3♥:
    - 3♠:
  - 1NT: 11-13 bal
  - 2♣: 5-4 either way in minors (or 5-5)
    - 2♦:
    - 2♥:
    - 2♠: 4th suit
    - 2NT:
    - 3♣:
    - 3♦: Usually four diamonds
    - 3♥:
  - 2♦:
    - 2♥:
    - 2♠: Ostensibly natural, maybe NT probe, adv cue for ♦ or waiting
    - 2NT:
    - 3♣: Onstensibly natural, maybe NT probe or adv cue for ♦
    - 3♦:
    - 3♥:
    - 4♦:
  - 2♥:
  - 2♠: Splinter bid
  - 2NT: 6-7♦, max
  - 3♣: Splinter bid
  - 3♦: Splinter bid
    - 3♥:
    - 3♠: Notrump probe or advanced cue
  - 3♥:
  - 3♠:
  - 4♣:
  - 4♦:
- 1♠:
  - 1NT: 11-13 bal, singleton ♠ is possible
  - 2♣: 5-4 either way in minors (or 5-5)
  - 2♦:
    - 2♥:
    - 2♠:
    - 2NT:
    - 3♣: Can be a notrump probe or adv cue for ♦
    - 3♦:
    - 3♥:
    - 3♠:
  - 2♥: 5-6♦ & 4♥, max
  - 2♠:
  - 2NT: 6♦, max
  - 3♣: Splinter bid
  - 3♦: Splinter bid
  - 3♥: Splinter bid
- 1NT: 7-10
- 2♣: GF, except if rebid 3♣
  - 2♦: Extra length and/or minimum hand
  - 2♥:
  - 2♠:
  - 2NT:
  - 3♣:
  - 3♦:
- 2♦: GF, except if rebid 3♦
- 2♥: Weak-two
- 2♠: Weak-two
- 2NT: 11-12, no 4-crd major
- 3♣: 5+♣ & 5+♦, 9-11
- 3♦: 5+♣ & 5+♦,
- 3♥: Typical 3-1 in majors and (54) in minors
- 3♠: Typical 1-3 in majors and (54) in minors
- 3NT: 13-15(16), nat.
1♥: 5+♥, 9-15
- 1♠:
  - 1NT:
    - 2♥:
    - 2♠: Usually six spades
    - 2NT:
    - 3♣:
    - 3♦: Usually four diamonds
    - 3♥:
    - 3♠:
  - 2♣:
    - 2♦: 4th suit
    - 2♥: Possibly false preference
    - 2♠:
    - 2NT:
    - 3♣:
    - 3♦:
    - 3♥:
    - 3♠:
    - 4♣:
  - 2♦:
    - 2♥: Possibly false preference
    - 2♠:
    - 2NT:
    - 3♣: 4th suit
    - 3♦:
    - 3♥:
    - 3♠:
    - 4♦:
  - 2♥:
    - 2♠:
    - 2NT:
    - 3♣:
    - 3♦: Usually four diamonds
    - 3♥:
    - 3♠:
  - 2♠:
  - 3♣:
    - 3♦: 4th suit
  - 3♦:
  - 3♥:
  - 3♠:
- 1NT: 8-13
  - 2♣:
    - 2♦: 5+♦
    - 2♥:
    - 2♠: 5+♣, max
    - 2NT: 11-13
    - 3♣: 5+♣, min
  - 2♦:
    - 2♥:
    - 2♠: 5+♦, max
    - 2NT: 11-13
    - 3♣:
    - 3♦: 5+♦, min
  - 2♥:
  - 2♠:
  - 3♥:
- 2♣: GF, except if rebid 3♣
  - 2♦:
  - 2♥: Minimum and/or extra length
  - 2♠:
  - 2NT:
  - 3♣:
  - 3♦:
  - 3♥:
- 2♦: GF, except if rebid 3♦
  - 2♥:
  - 2♠:
  - 2NT:
  - 3♣:
  - 3♦:
  - 3♥:
- 2♥:
  - 2♠: Opener must bid 2N
    - 2NT: Forced
      - 3♣: Trial-bid in ♣
      - 3♦: Trial-bid in ♦
      - 3♥: Trial-bid in ♠
  - 2NT: Short suit trial-bid in ♠
  - 3♣: Short suit trial-bid in ♣
  - 3♦: Short suit trial-bid in ♦
- 2♠: Limit raise in ♥
- 2NT: GF w/support
- 3♣: 10-12 w/support
- 3♦: 6-9 w/support
- 3♥:
- 3♠: Unknown singleton w/support
- 3NT: Support w/void in ♠
- 4♣: Support w/void in ♣
- 4♦: Support w/void in ♦
- 4♥: In principle preemptive but can be quite strong
1♠: 5+♠, 9-15
- 1NT: 8-13
- 2♣: GF, except if rebid 3♣
  - 2♦:
    - 2♥: 4th suit
  - 2♥:
  - 2♠: Extra length and/or minimum
  - 2NT:
  - 3♣:
  - 3♦:
  - 3♥:
- 2♦: GF, except if rebid 3♦
  - 2♥:
  - 2♠: Minimum and/or extra length
- 2♥: GF, except if rebid 3♥
  - 2♠: Minimum and/or extra length
  - 2NT:
  - 3♣:
  - 3♦:
  - 3♥:
- 2♠:
  - 2NT: Opener must bid 3♣
    - 3♣: Forced
      - 3♦: Trial-bid in ♦
      - 3♥: Trial-bid in ♥
      - 3♠: Trial-bid in ♣
- 2NT: GF w/support
- 3♣: 10-12 w/support
- 3♦: 6-9 w/support
- 3♥: 10-12 w/support
- 3♠:
- 3NT: GF w/support, unknown singleton
- 4♣: Void
- 4♦: Void
- 4♥: Void
- 4♠: Preemive in nature but can be quite strong
1NT: 14-16 HCP (5-crd major poss)
- 2♣: Puppet Stayman
  - 2♦: No 5-crd major
    - 2♥: 4♠
    - 2♠: 4♥
    - 2NT: Denying 4-crd majors
    - 3♣:
    - 3♦:
  - 2♥:
  - 2♠:
  - 2NT: No majors, min
  - 3♣: Max
  - 3♦: Max
  - 3NT: No majors, max
- 2♦:
- 2♥:
- 2♠: Minor Stayman
  - 2NT: No minor w/ Hxxx or better
    - 3♣: Both minors (5-5), sign-off
    - 3♦:
    - 3♥: Shortness
    - 3♠: Shortness
  - 3♣: Hxxx or better in ♣
    - 3♦:
    - 3♥: Shortness
    - 3♠: Shortness
  - 3♦: Hxxx or better in ♦
    - 3♥: Shortness
    - 3♠: Shortness
- 2NT: Transfer to 3♣ (Very often sign-off in ♣ but could be a GF with a Marmic hand)
  - 3♣: Forced ;-)
    - 3♦: 4-4-1-4 (singleton ♦)
    - 3♥: 4-1-4-4 (singleton ♥)
    - 3♠: 1-4-4-4 (singleton ♠)
    - 3NT: 4-4-4-1 (singleton ♣, 10-12)
    - 4♣: 4-4-4-1 (singleton ♣, 13+)
- 3♣:
- 3♦:
- 3♥: 3-1 in majors (54 in minors)
- 3♠: 1-3 in majors (54 in minors)
- 3NT:
- 4♣: 1430
- 4♦:
- 4♥:
- 4♠: 6-5 in minors
2♣: 6+♣, 9-15
- 2♦: Ask for major
  - 2♥:
    - 2♠: Can be nat. or can be a stopper
    - 2NT:
    - 3♣:
    - 3♦: Can be nat. or can be a stopper.
    - 3♥:
    - 3♠: Splinter
    - 4♣:
    - 4♦: Splinter
    - 4♥:
    - 4♠: Voidwood
    - 4NT: 1430
    - 5♦: Voidwood
  - 2♠:
    - 2NT:
    - 3♣:
    - 3♦: Can be nat. or can be a stopper
    - 3♥: Can be nat. or can be a stopper
    - 3♠:
    - 4♣:
    - 4♦: Splinter
    - 4♥: Splinter
    - 4NT: 1430
    - 5♦: Voidwood
    - 5♥: Voidwood
  - 2NT:
    - 3♣:
    - 3♦: Maybe nat. or maybe a stopper
    - 3♥: Maybe nat. or maybe a stopper
    - 3♠: Maybe nat. or maybe a stopper
  - 3♣:
    - 3♦: Ostensibly natural but can be a notrump probe
    - 3♥: Nat. or stopper
    - 3♠: Nat. or stopper
  - 3♦:
  - 3♥:
  - 3♠:
- 2♥:
  - 2♠: 0-2♥
    - 2NT: Nat. not forcing
    - 3♣: Nat. not forcing
    - 3♦: GF
    - 3♥:
  - 2NT: 1-2♥, min.
  - 3♣: 0-2♥, min
  - 3♦: max.
  - 3♥:
  - 3♠: Splinter
  - 3NT: 1-2♥, Nat., max
  - 4♦: Splinter
  - 4♥: Nat.
- 2♠:
  - 2NT: 1-2♠, min.
    - 3♣: Not forcing
    - 3♦: GF
    - 3♥:
    - 3♠:
  - 3♣: 0-2♠, min.
    - 3♦: GF
    - 3♥:
    - 3♠:
  - 3♦: 0-2♠, max.
  - 3♥: 0-2♠, max.
  - 3♠: Nat.
  - 3NT: Nat. max.
  - 4♦: Splinter
  - 4♥: Splinter
  - 4♠: Nat.
- 2NT: Puppet to 3♣ 1) Preempt in ♣ or 2) 5-5 hand, GF
- 3♣: Puppet to 3♦ 1) Weak hand w/long ♦ or 2) Slam try w/ a 6-crd suit.
- 3♦: Short ♦
- 3♥: Short ♥
- 3♠: Short ♠
- 3NT: Nat.
- 4♣:
- 4♦: 1430
- 4♥: To-play
- 4♠: To-play
2♦: Multi (Weak-Two in a major)
- 2♥: p/c
- 2♠: p/c
- 2NT: Relay ask
  - 3♣: Any max. (Unknown suit)
  - 3♦: ♥ suit, min.
    - 3♥:
    - 3♠:
    - 4♣:
  - 3♥: ♠ suit, min.
  - 3♠: AKQxxx in ♥
  - 3NT: AKQxxx in ♠
- 3♣:
- 3♦:
- 3♥: p/c
- 3♠: p/c
- 3NT:
- 4♣: Opener bids the suit under his major
- 4♥: To-play
- 4♠: To-play
2♥: Good preempt in ♣
- 2♠:
- 2NT: Ask for ♣ quality
  - 3♣: 1 top honnor in ♣
  - 3♦: 2 top honnors in ♣ and ♦ feature
  - 3♥: 2 top honnors in ♣ and ♥ feature
  - 3♠: 2 top honnors in ♣ and ♠ feature
  - 3NT: ♣AKQxxx
- 3♣:
- 3♦: Ask for 3-crd MA
  - 3♥:
  - 3♠:
  - 3NT: No 3-crd MA
- 3♥:
2♠: Good preempt in ♦
- 2NT: Ask for ♦ quality
  - 3♣: 2 top honnors in ♦ and ♣ feature
  - 3♦: 1 top honnor in ♦
  - 3♥: 2 top honnors in ♦ and ♥ feature
  - 3♠: 2 top honnors in ♦ and ♠ feature
  - 3NT: ♦AKQxxx
- 3♣: Ask for 3-crd MA
  - 3♦: No 3-crd MA
  - 3♥:
  - 3♠:
  - 3NT: No 3-crd MA (♦AKQxxx)
- 3♦:
- 3♥:
- 3♠:
2NT: Preempt in ♣
- 3♣:
- 3♦:
- 3♥:
- 3♠:
- 4♣:
3♣: Preemt in ♦
3♦: Preempt in ♥
3♥: Preempt in ♠
3♠: Any solid 7+crd suit
3NT: Preempt in ♣ & MA (6+/5+)
4♣: Preempt in ♦ & MA (6+/5+)
4♦: Preempt in ♥ & ♠ (6+/5+)
4♥: Preempt in ♠ & ♥ (6+/5+)
4♠: Preempt with both mi (6+/5+)
4NT: Preempt w/ both minors
5♣: Preempt
5♦: Preempt

∑OTZ (Precision style)