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  2. XY Notrump convention - Wikipedia

    en.wikipedia.org/wiki/XY_Notrump_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 ...

  3. 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 ...

  4. 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 ...

  5. Losing-Trick Count - Wikipedia

    en.wikipedia.org/wiki/Losing-Trick_Count

    The Losing Trick Count, as used by the leading contract bridge tournament players, with examples of expert bidding and expert play. London: Methuen. p. 176. Nine editions published between 1935 and 1947. Republished in 2006 as Losing Trick Count - A Book of Bridge Technique by F. Dudley Courtenay, ISBN 978-1-4067-9716-9.

  6. Hand evaluation - Wikipedia

    en.wikipedia.org/wiki/Hand_evaluation

    In contract bridge, various bidding systems have been devised to enable partners to describe their hands so that they may reach the optimum contract.Key to this process is that players evaluate and re-evaluate the trick-taking potential of their hands as the auction proceeds and additional information about partner's hand and the opponent's hands becomes available.

  7. Takeout double - Wikipedia

    en.wikipedia.org/wiki/Takeout_double

    This hand is a minimal takeout double when the opponent opens 1 ♥. With other opening bids, it should be passed. Also, if the opening bid was 3 ♥, the hand would be not strong enough to double. 2) ♠ KQ83 ♥ A52 ♦ 10 ♣ AJ1062: If opponents have bid 1 ♦ – 1 ♥, the takeout double shows the unbid suits (spades and clubs)

  8. Quantitative notrump bids - Wikipedia

    en.wikipedia.org/wiki/Quantitative_notrump_bids

    If responder has 19 or 20 HCP, then a small slam is a possibility but more information is needed about opener's hand before it should be bid. This is where a quantitative bid should be made. A bid of 4NT "invites" opener to: bid 6NT with a maximum holding of 14 HCP (19 + 14 = 33 which is sufficient) pass with a minimum 12 HCP (20+ 12 = only 32)

  9. Cappelletti convention - Wikipedia

    en.wikipedia.org/wiki/Cappelletti_convention

    2 ♣ declares a one-suited hand - usually 6 or more cards, but some bid with a strong 5-card suit. Partner (known as 'Advancer') is expected to respond as follows: usually, Advancer makes an artificial 'relay' bid of 2 ♦, asking Intervener to pass if his suit is diamonds and otherwise to bid his long suit at the lowest level.