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Detail specifications 64BC - Level 3 ★

2♣ OPENING

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As a result of a 2♦ multicolor opening, a 2♣ opening now becomes the strongest opening.
As well as a 2♦ multicolor opening, 2♣ is also a forcing opening bid. You can use this opening with a regular hand with at least 22HCP, any extremely strong one-suiter hand or any other distribution which is Game forcing.
Generally, this opening is Game forcing.
Important 2♣ is Game forcing, except
  • after a negative or "Drop Dead" 2♦ response
  • and a rebid by 2NT.
    • In this situation, the sequence is only one round forcing.
     
    Responses to 2 ♣ Opening
    The Responder indicates whether he has any aces !
    • 2♦ : negative bid less than de 8HCP and no aces
    • 2♥ : 1 red Ace (♦ ou ♥)
    • 2♠ : 1 black Ace (♣ ou ♠)
    • 2NT : at least 8HCP or 2 Kings
    • 3♥ : 2 Aces of the same color
    • ♠ : 2 same ranked Aces (2 major or 2 minor Aces)
    • 3NT : 2 mixed Aces

    The bidding sequence is game forcing, except after a negative 2♦ bid. Opener rebids 2NT . In this case, Responder passes with a bust hand.
    A
    K
    J
    A
    K
    Q
    J
    9
    6
    8
    5
    7
    6
    SWNE
    2
    Pass
    3
    Q
    2
    8
    7
    4
    2
    A
    10
    9
    A
    9
    8
    2
    Exercise E9483 After a 2♣ opening, the Responder bids his Aces. In this case he has 2 Aces of the same rank (2 minor Aces), and therefore bids 3♠.
     
     
    Rebid after a 2 ♣ opening
    In the second bidding round, Opener describes his hand :
    • Regular hand 22-23HCP: the sequence is no longer Game forcing if the Opener bids 2NT after a 2♦ response. With a regular hand of 0 or 1 HCP, Responder passes.
    • Regular hand of 24HCP : Opener rebids 2♥
    • One-suiter hand: Opener bids his suit
    • In all cases, the bid of a suit (♠,♥,♦ or ♣) renders the bidding sequence Game forcing

    SWNE
    2
    Pass
    2
    Pass
    2NT
    A
    J
    9
    2
    K
    4
    K
    Q
    4
    A
    K
    Q
    3
    Exercise 9480 After a 2♣ opening, the Opener rebids 2NT to describe a regular hand with exactly 22-23HCP. The bidding sequence continues with the Stayman convention and the discovery of a fit in ♠. Responder can also pass when he has a bust hand! 
     
     
    After the negative 2♦ response :
    • Opener bids his suit (♠,♦ or ♣)
    • The Opener rebids 2CO in order to render the bidding sequence Game forcing. He may have:
      • either a regular hand with 24 HCP or more and the team will play at least 3NT
      • or a strong ♥ suit with at least 5 cards

    After the 2 ♥ rebid, Responder bids a 2♠ relay bid to allow the Opener to describe his hand (regular or ♥ one-suiter). The Opener bids
    • either 2NT if he has a regular hand and the bidding can continue with Stayman, Texas etc...
    • or 3CO with a one-suiter

     
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