Strong 2 Club
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Why do we open 2C?
Remember that an opening of 1 of a suit shows up to 21 HCP.  As a result, partner bids with 6 HCP to keep the bidding alive in case we have 20 or 21 so that if together we have 26 points we do not miss a game.  So we are safe opening 1 of a suit with 21 HCP.  We open 2♣ only when we have enough points to make game even if partner has less than 6.  So when deciding whether to open 1 of a suit or 2♣, you should ask yourself  “Can I make game if partner has less than 6 points?”.  If you can, then open 2♣.  If not, open 1 of a suit. When your partner opens 2C, she can have either a balanced or unbalanced hand. You will only know which type of hand she has when she bids the second time.  
Open this hand with 2C - 22+points any shape
Open this hand with 2C - 22+points any shape
How high does a 2C opening bid force your partnership to bid?
The 2C opening bid is forcing to any one of three levels:
1) 2NT,
2) 3- of either Major suit,
3) 4- of either Minor suit; i.e., one trick short of game ineach instance.  
Responder is obligated to keep the bidding open, at least until one of these three previously-mentioned levels has been reached, and may not “pass” until then.
How to respond to 2C
1) 2D - artificial waiting bid so that opener can tell you more about her hand
2) 2H and 2S - 5+ card suit, 8+ points and a good suit
3) 2NT - I strongly recommend of never bidding 2NT (if you don't have a 5-card suit just bid 2D waiting bid) you want the contract to be played by the strong hand
4) 3C and 3D - 6+ card suit, 8+ points  and a good suit
1 of 14. What do you bid over partner's 2C *
1 point
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2 of 14. What do you bid over partner's 2C *
1 point
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3 of 14. What do you bid over partner's 2C *
1 point
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4 of 14. What do you bid over partner's 2C *
1 point
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Rebids by 2♣ Opener with Balanced Hands
The level of the no trump rebids depends on the number of his points.
- 2NT - Opener's rebid with 22-24 points and a balanced hand
- 3NT - Opener's rebid with 25-27 points and a balanced hand
- 4NT - Opener's rebid with 28-30 points and a balanced hand
Note that you and your partner have to agree on these ranges. It is fine to modify them, but you do have to agree. The No Trump structure is so very precise. It is easier to bid in these (No Trump) scenarios as you have EXACT information about partner’s points and shape.
After 2C  - 2D and opener's 2NT rebid all system are on (just like partner would start the bidding with 2NT).
3C - Stayman (you only need 3+ points and a 4 card major to bid Stayman because opener shows 22-24)
3D - transfer to heart (0+ points and 5+card in hearts)
3H - transfer to spade (0+ points and 5+card in spades)
3S - transfer to minors (0+ points and 6+card in a minor)
3NT - to play
4C Gerber - asking for Aces
5 of 14. What do you bid over partner's 2C *
1 point
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6 of 14. What would you bid next? *
1 point
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7 of 14. What would you like to bid next? *
1 point
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Rebids by 2C opener with unbalanced hands.
New suit bid (2♥, 2♠, 3♣, 3♦) is natural, forcing, and promises at least 5 cards in the suit. With no 5-card suit, bid notrump. The third round of bidding allows both partners to bid 4-card suits. However, if a fit has been located, it's better to confirm that fit. A player who knows the right contract is notrump can bid notrump. New suit bids by both partners are still forcing.
8 of 14. What would you bid next? *
1 point
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9 of 14. What would you bid next? *
1 point
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What do you do after you found a fit?
As already stated, any suit bid by opener is forcing for one round. Responder can bid as follows.

Single raise - natural, 3+ card support and 7+points. This shows a supporting hand with slam interest, even if responder's first bid was 2D.
Double raise - natural, 3+ card support and 3-6 points. This is a signoff if responder's first bid was 2D.

With a good hand, it's better to bid "slowly" and save space for slam exploration. With a poor hand, it's less important to save space. Thus the distinction between single raises and double raises, which is based on the principle of "fast arrival".
10 of 14. What would you bid next? *
1 point
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11 of 14. What would you bid next? *
1 point
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Second Negative
The "Second Negative". Many players use a conventional second bid by responder to show a truly poor hand of 0-2 points. This is done by bidding the "cheapest" (i.e. lowest-available) minor suit.
12 of 14. What would you bid next? *
1 point
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13 of 14. What would you bid next? *
1 point
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14 of 14. What would you bid next? *
1 point
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