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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. Unusual notrump - Wikipedia

    en.wikipedia.org/wiki/Unusual_notrump

    When an opponent opens the bidding with 1 ♥ or 1 ♠, the immediate overcall of 2NT shows at least 5–5 in the minor suits (that is, at least five clubs and at least five diamonds). If the right hand opponent (RHO) of the partner of the 2NT bid passes, that partner is expected to bid the minor suit that he prefers at the three-level.

  4. Forcing notrump - Wikipedia

    en.wikipedia.org/wiki/Forcing_notrump

    2NT is natural and invitational (showing about 18 HCP) three of a new suit (jump shift) is natural, normally agreed to be game-forcing, and shows about 19 points or more; When opener does not have a six-card original suit nor a four-card lower-ranking second suit, she will have to bid a short suit. Normally, she bids her three-card minor.

  5. Quantitative notrump bids - Wikipedia

    en.wikipedia.org/wiki/Quantitative_notrump_bids

    An opening bid of 2NT shows 20, 21 or 22 HCP. If responder has 13 HCP, then a small slam looks certain (13 + 20 opener's minimum = 33) and should be bid; If responder has 11 or 12 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.

  6. Jacoby transfer - Wikipedia

    en.wikipedia.org/wiki/Jacoby_transfer

    2 ♠ may also be used as a Baron range enquiry, to find whether opener is minimum or maximum, if responder has 11-12 points (looking for game in NT) or 17-20 points (looking for slam in NT or a minor) An alternative method of minor suit transfers is to use 2 ♠ as a transfer to clubs and 3 ♣ (or 2NT) as a transfer to diamonds.

  7. Jacoby 2NT - Wikipedia

    en.wikipedia.org/wiki/Jacoby_2NT

    Jacoby 2NT (Swedish: Stenberg 2NT) is a bridge convention in which a bid of 2NT over partner's opening bid of one heart (1 ♥) or one spade (1 ♠) shows a hand with both opening strength or better - normally at least 12 HCP or a hand meeting the "Rule of 20" criteria, and; at least four-card support for opener's major suit.

  8. Baron convention - Wikipedia

    en.wikipedia.org/wiki/Baron_convention

    After a 1NT opening, a 2 ♠ response asks opener whether he is minimum or maximum for his bid. Opener responds 2NT with a minimum or at the three-level in his lowest four-card suit with a maximum. Responder may have one of two ranges: 11-12 points (looking for game in notrump) or 17-20 points (looking for slam in notrump or a minor suit).

  9. Landy convention - Wikipedia

    en.wikipedia.org/wiki/Landy_convention

    A particular popular modification in the Netherlands is Multi-Landy, [6] a combination of Landy, the Multi 2 diamonds convention and the Muiderberg convention. In this modification, the 2 ♣ overcall is the same as in Landy, the 2 ♦ overcall shows a 6-card major suit, and 2 ♥ or 2 ♠ overcall shows five cards in that major suit and at least four cards in a minor suit.