(not 20-21 bal).
Maybe less with playing strength, esp at FAV (everything is one point lighter).
Also unbalanced playing strength hands with CLUBS (14-15 HCP) are routinely opened 1C
Hands with 5cM and 15 points should open 1C if BAL, but might open 1M if shapely
*NEW* Unfave, 1NT is 14 - 16 “balanced”, so 1C becomes 17-19 if Balanced.

• 1D: Art, (8)9+, ANY GF
• 1H: (4)5-8(9), most hands.
• 1S: Art, 0-4, ANY (not 7 card D,H,S is this true? 3d &h are major defers now)
• 1NT: 5+H, 5+ Another, 4-7(8)
• 2C: 5+S, 5+ Another, 4-7(8)
• 2D: 6+ Hearts, 4-7(8)
• 2H: 6+ Spades, 4-7(8)
• 2S: (6)7+ Clubs 4-7(8)
• 2NT: 5/5+ minors (less than 8 points).
• 3C: (6)7+ Diamonds 4-7(8)
• NEW 3D/H: Tfr to H/S, Distributional Game bids in majors (less than 8 HCP, Max 1 KC).
• NEW 4C/D show 6/5 Majors (show longer), min GF

Bid Naturally.
..1M: can be 4+, usually 5
……2M shows 3 and Min
……3M shows 4 and Min (usually no SPL)
……2NT shows 4 and Extras
……SPL can be min+
……with 3 trumps and extras, change suit OR 1NT then 3M
..1NT = (15)16 - 19 or 22+ SYSTEM ON
..2C/2D Natural:
……STEP is WAITING (including weak hands with a fit)!!
……others Natural, good 5+ card suits (else step=waiting)
……2NT: ART shows the Replacement Suit
……(Raises of the minor are constructive, jumps are SPL)
..2M: ART, 5+ Diamonds and exactly 4M.
..3D/H/S: Solid suit, sets trumps, demands Cue Bidding

..1S = CLUBS Any strength (NF or GF), or (17)18-19 BAL
..1NT: NV 15-16(17), Vul (15)16-17, SYSTEM ON
..2C: ART, GF.
..2D/H/S N/F.
..2NT 22-24 BAL.
..3any: Nat GF sets trumps.

1C: .. 1H:
1S = CLUBS ANY strength, or (17)18-19 Balanced.
……1NT = Roughly 4-5(6) HCP, balancedish. Suggestion of contract opposite 18-19 BAL.
………..2C=Nat N/F
………..2D/2H/2S = Forcing showing clubs
………..2NT/3C = Inv, showing clubs.
………..3D/3H/3S = G/F Auto Splinters with clubs.
……2C = ART G/F opposite 18-19 Balanced, but not super accept for clubs.
……2D = ART G/F opposite 18-19 Balanced, and super accept for clubs. More about quick tricks for 3NT than promising huge club support. G/F opposite both.
……2M = NAT showing a good 5c suit or weak six -card suit too poor to show the first time.

……….After the 1S bid, if Opener bids a non-jump 3C it is NonF, others a GF with Clubs.

== 1C: 1H: 2C: ART G/F (but usually not with primary clubs, else start 1S)
..2D: Waiting (+ Kokish)
..2M/3m: Good 5/6c suits similar to over a normal strong 2C (except limited).
..3M: Canape with 5+ Diamonds & usually exactly 4M.

..1NT ANYTHING (15)16-19Bal or many semi Bal, system on
..2C: Strong, GF, (with full system on inc Kokish and Canape Diamond Jumps)
..2D/2H/2S/3C Non Forcing
..2NT 22-23, PASSABLE
..3X Natural ~9 tricks

..2C Asks
………..2D = H & D
………..2H = H & C *the ask suit
………..2S = H & S
..basically always ask
..3M sets H asks shortage
..2M to play??
..2D to play??
..Pass to play

..2D Asks
………..2H = S & H
………..2S = S & D *the ask suit
………..3C = S & C
..basically always ask
..3M sets S asks shortage
..2H to play??
..Pass to play

..PASS: non Forcing
..2M: To play
..3M Asks shortage

..3C: to play
..others: GF
..4C: C GF
..4D: Kickback

..3m: to play
..3M: Forcing
..4m: sets suit GF
……4m+1 kickback, others shortage inc 4NT replacement kickback shortage

..3D: to play
..others: GF
..4D: D GF
..4H: meant to be kickback, because you can bid 3H then 4H.

##New, to confirm

(C= longer H, D=longer S)

See: 1C Interference