1 Club Opening bid & Responses

   

These sequences following a 1 at the 1-level are very different to sequences over all other 1-level openings.

Requirements:
         2+ card Club suit 12-18 HCP.  7 1/2 LTC maximum. In short - a sound opening. Denies a 5 card Major or Diamonds or 4-4 in Majors.
         With 12-14 1NT is to be preferred to a 1 opening whenever the hand respects all the 1NT opening bid requirements

Important '& transfer' sequences & other continuations:

Note: Completing the 'transfer' shows a 12-(15)HCP 4 card fit in Hearts or Spades!

1 12+HCP & 2+ Clubs   Note: 1 is strictly 12+ , responder must reply at the 1-level if holding a 4+ card Major - regardless of strength!

. 1 4+ Hearts 4+ HCP – holding 4 or more Spades is not excluded, a subsequent 2 rebid                                                     shows 6 cards and <9HCP. A suit rebid by responder is always weak and 6+ cards in Beta..

. . 1 4+ Hearts 12-14-(15) HCP - FIT.

. . . 1 Responder now shows 4-4 or better in Majors

.       .       .       .       2+opener shows the double major fit

.       .       .       .       1N 12-16 Denies 4 Spades - usual 9+2 Crowhurst, else 2Ma

. . . 2|3N or 2񔬊 To play - anything else is forcing

. . 2 4+ Hearts (15)-16+ HCP - Forcing fit

.        .        .      Shows any 2nd suit with control & 10+ DP Game forcing

.        .        .      PASS

.        .        .      2N Flat hand  9+HCP

.        .        .      Limit raises based on DP

.       .         .      4mi SWISS Balanced solid raises to at least game

. . 1   4 Spades 0-3 Hearts 12+ HCP

.        .        .       2♦ 5+  Diamonds  <9  HCP

. . .  2 To Play, 6+ cards weak <9 HCP

.        .        .       2 10+ 'Inverted' 4+ Clubs, 10+ HCP

.        .        .       3 Weak, 5+ Clubs , some distribution,<=9HCP

.        .        .       1N <=9 HCP

.        .        .        3 (9)10+ 5+ diamonds

.        .        .        3 6+ cards (9)10+ HCP

.        .        .        2񔬊 4+ Spades, Natural, limit bids, over any intervention (more distributional)

.        .        .        2N is Trustcott over intervention ONLY, Spade fit to at least the 3-level (based on DP)

.        .        .        2N no intervention (9)10+HCP, Natural Balanced, 3433 or 34{42} Note: always 3 Spades

.        .        .        4mi SWISS Balanced solid raises to game

. .  1N 12-16 HCP Balanced: i.e. 3-3-{3-4} or {3-3-2}-5

. . .    2 Re-transfer to hearts - Shows 5 card Hearts <9HCP

.        .        .        2 To Play 6+ cards <9HCP

.        .        .        2 Shows 5+ Spades in addition to Hearts already shown <9 HCP

.         .       .        2 Crowhurst  Inquiry - 9+ HCP Adapted responses in 1 sequences: 

                                Note: Crowhurst is modified following 1 opening.         

.       .         .        .        3 3 card support partner's Major 12-14

.        .         .        .       3 4 card Hearts 12-14 (partner showed 4+ Spades & denied 4 H's)

.        .         .        .       2 min 12-14 

.        .         .        .       2N: (14)15: Balanced

.        .         .        .       3♣!: 16HCP Balanced

.        .         .        .       3 1516 3 card Heart support or 4 card Hearts if partner showed 4+ Spades

.        .         .        .       3 1516 3 card Spade support 

.        .         .        .       3: 4 card diamonds

.        .         .        .       3!: 5+ card clubs (as 4 card Majors would already be expressed instead of 1N). 
                   

.         .         .        .       PASS

. . .       2N Invitational - opening values balanced

. . 2 5+ Clubs Natural

. . . 2 To Play 6+ cards

.        .         .      Raises natural limit bids.

. . 2 See below: rebids after 1 response

. . 2 4+ Spades 4+ Clubs (15)16+  4-5 LTC

. . 2N 17-18 HCP Balanced - Natural continuations: 3N to play, 3 rebid 6+ card suit weak, other 3-level bids Forcing

. 1 4+ Spades 4+ HCP – 0-3 Hearts. A later rebid of 2 shows 6+ cards

. 1 shows 4+ card Spade fit 12-14-(15) HCP

. . 2 4+ Spades (15)-16+ HCP 

. . 1N 12-16 HCP 3-3-3-4 or 3-3-2-5    denies 4 card Spades or Diamonds 

. . .       2 Inquiry.9+ HCP 

.        .       .       Otherwise <9HCP: PASS, 2 re-transfer to spades 5+ cards, 2  6 cards, 2 5+ Cards
.        .      2 5+ Clubs Natural 

.     2 4 card Diamonds , denies 5+ Clubs

. . 2 4 Hearts , denies 5+ Clubs

. . 2N 17-18 HCP Balanced

. . 3 6+ Cards, 15+ HCP

.      1! (9)10+ denies any 4 card major

.       .       2   Natural 5+ Cards 12-14

.      .        .           2  5+ Diamonds denies a Club fit

.      .         .           PASS

.      .         .           3  fit

.      .         2   4  Diamonds. 12-14 HCP. 

.      .         .         3 5+ Clubs unbalanced 

.      .         .         3  4+ Diamonds

.      .         .         2N min balanced,

.      .         .         3N to play,

.      .         .         2Ma either responder's major rebid 5+ cards or otherwise a guard;

.      .        1N  12-16 Balanced inducates 7 cards in Majors {34}

.      .         .        2 inquiry  9+ 

.      .         .        .        2  12-14 no major

.      .         .        .        2Ma 4card 

.      .         .       .         3 16  HCP

.      .         .       .         2N  15 HCP

.      .        .         PASS

.      .        .        3  5+ Clubs <9 HCP

.      .         2N Balanced Natural. 17-18 CP

. 1N 5-8(9) denies any 4 card major

, , PASS nothing to say

,       ,       2 To play 5+ Clubs

, , 2♦! 17+HCP 0-4 Diamonds Forcing unbalanced

.       .       .         2Ma: Guard

; . . 3 5+ Clubs

.       .       .       3  5+ Diamonds

.       2 5+ Clubs (9)10+ HCP - Inverted minor continuations - denies any Major suit. Attn: if opp. doubles: inverted requirements are NOT required but 5 cards are.

.        2 5+ Diamonds.  Denies any other suit.   (9)10+ HCP

. 2| (15)16+ & quality 5+ Card Major

. 2N Balanced 'Baron' – suits bid 'up-the-line' (15)16+ HCP - can show a good 3 card major guard en-route

.        3|4 Inverted pre-emptive  club raises  <=(9) HCP. Requires distributional features and 6+ card Clubs.; denies any Major suit

Jump rebids by opener:
     
A single jump in a NEW suit bid shows a side suit that's usually short 2-3 cards with at least (1)2  top controls in it - forcing. Also implies a single suited hand in clubs - 5+ cards.
A 2NT jump rebid shows 17-18 HCP balanced hand
A jump rebid in clubs shows 6+ card suit and 16+ HCP
A double jump bid in a new suit is a cue-bid (S or V or Ax) & 4 card support for partner's response suit. E.g. 1-1|-4mi or 4| responder may close auction bidding 4 or cue-bid|TURBO 4N etc.
Intervention 1 -12X simple overcall or weak jump overcall

X=

1D: This is easily circumvented:

*: If A T_O: Has no effect! But provides an additional bids of Redouble and PASS:

1Ma: Mild intervention: Limited effect


1N: Strength showing intervention

Breakouts

A jump to the 3-level is a Breakout over the 1 opening, shows a 7+ card suit & <=9HCP.
These reponses also explicitly deny holding any 4 card major side suit (9)10+ HCP

3
all show 7 card suits (possibly a very good 6 card suit).
Warning: These bids cannot be made if opponents intervene with a weak 2 overcall - as  Rubinsohl transfers for Majors only  are now now made available - weak or strong
- see below.
3 requires any 6 card or a  good 5 card auit, and some distribution. This is to be treated as a weak inverted minor bid even if bid over a weak 2 intervention.

NOTE: Breakouts are NOT available over 1 openings!

2 Level weak interventions

2-level suit overcalls, 5+ cards

        * Shows 10+HCP -  The suit below!

         2N-3: Rubinsohl transfers , shows a Good 5+ Card Suit, transfer to opponents suit shows 4 card in highest unbid Major

         3S transfer to 3N to play - guard promised
       PASS Natural.
  
Note: 2 suited hands cannot be shown with a single bid:
2N shows 16+  Baron - denies any 4 card Major NOT H+L! Likely to be 3-3 or {2-3} in the Majors & deny a 5 card unbid minor
1N shows weak hand 5-8(9) - denying any Major

~ Cue-bid of an intervention was raised by a partner (suggesting both highest  unbid 5-5) BUT this is not at all  in keeping with the character of 1C sequences. It therefore must deny any 4+ card Major, show 10+, and a balanced hand.
Consider: 1C-1D-2D Assuming D intervantion to be natural then: 12-14(15) likely to be either 33{43} or 2344 or 2235 - no trump type hands!;  as 1C-1D-2C is 10+ with 5+ Clubs.
Weirder is 1C-2C(likely to be Majors or Clubs depending on opps system)- 2D natural 10+5+  denies any Major -3C  5+ Clubs denies any Major 10+HCP.
~ An incident raised the following: 1C-1D(natural intervention)-*(4+ Hearts)-2D(op raises)-3D? It must clearly deny any 4+ card Major - Indeed it can only show exactly 3 Spades and at least 5 Clubs & be game forcing! Also 1C-2C(genuine)-? -2D 5+cards Diamonds & no 4 card Major; -2Ma natural 4+ cards; -* ;-3C logically: Both Majors 4-4 or better.