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2. 2/1 game forcing - Wikipedia

   en.wikipedia.org/wiki/2/1_game_forcing

   1 ♠ – 2 ♣ 2 ♠ – 2NT. Forcing to game, with balanced hand and a good club suit. 1 ♠ – 2 ♣ 2 ♦ – 3 ♣ Forcing, unless the partnership has agreed that this is an exception to the "2/1 rule." 1 ♦ – 2 ♣ Forcing for one round only (as in Standard American), except in the variant of 2/1 where this sequence is game forcing as ...

3. Strong two clubs - Wikipedia

   en.wikipedia.org/wiki/Strong_two_clubs

   Bridge bidding systems that incorporate a strong 2 clubs opening bid include modern Standard American, standard Acol, 2/1 game forcing and many others. In most natural bridge bidding systems, the opening bid of 2 ♣ is used exclusively for hands too strong for an opening bid at the one-level. Typically, the bid is reserved for hands that are ...

4. Strong club system - Wikipedia

   en.wikipedia.org/wiki/Strong_club_system

   The Strong Club System is a set of bidding conventions and agreements used in the game of contract bridge and is based upon an opening bid of 1 ♣ as being an artificial forcing bid promising a strong hand. [1] The strong 1 ♣ opening is assigned a minimum strength promising 16 or more high card points. All other bids would therefore be ...

5. Bidding system - Wikipedia

   en.wikipedia.org/wiki/Bidding_system

   A bidding system in contract bridge is the set of agreements and understandings assigned to calls and sequences of calls used by a partnership, and includes a full description of the meaning of each treatment and convention. The purpose of bidding is for each partnership to ascertain which contract, whether made or defeated and whether bid by ...

6. XYZ convention - Wikipedia

   en.wikipedia.org/wiki/XYZ_convention

   For example, on the sequence 1 ♣-1 ♠ (with or without opponent's interfering);1NT-2 ♣;2 ♦,2 ♥ will show an invitational hand with minimum five spades and four hearts, 2 ♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3 ♣ typically an ...

7. Hand evaluation - Wikipedia

   en.wikipedia.org/wiki/Hand_evaluation

   The 4-3-2-1 high card point evaluation has been found to statistically undervalue aces and tens and alternatives have been devised to increase a hand's HCP value. To adjust for aces, Goren recommended [5] deducting one HCP for a hand without any aces and adding one for holding four aces. Some adjust for tens by adding 1/2 HCP for each. [1]