stayman convention

Stayman is a bidding convention used by a partnership to find a 4-4 or 5-3 trump fit in a major suit after making a one notrump 1NT or opening bid; it has been adapted for use after a 2NT opening as well.
After an opening bid or an overcall of 1NT (2NT), responder or advancer bids an artificial bid of 2♣ ( or 3♣ after a 2NT opening) to ask opener if they hold a four card major suit.
The club bid which is artificial typically promises four cards in at least one of the major suits and enough strength to continue bidding after partner’s response (8 HCP for an invitational bid opposite a standard strong 1NT opening or overcall showing 15-17 HCP, 11 HCP opposite a weak notrump of 12-14 HCP, or 5 HCP to go to game opposite a standard 2NT showing 20-22 points).
It also promises distribution that is not 4333.

The opener replies with the following rebids:

2♦ (or after 2NT- 3♦) denies four or more cards in either major suit.
2♥ (or after 2NT – 3♥) shows at least four hearts (also meeting the criteria for an honor holding as may be set by partnership agreement). 2♠ (or after 2NT – 3♠) shows at least four spades.

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The Acol Bidding System

*If you live in the UK, Ireland, Australia or New Zealand Acol is the most widespread system Acol has the following characteristics:
  • It is a natural system: most opening bids, responses and rebids are made with at least 4 cards in the suit bid, and most no trump bids are made with balanced hands.
  • It is a four-card major system: only four-card suits are required to open 1♠ or 1♥, unlike Standard American and many other systems where five-card suits are typically required.
  • It makes extensive use of limit bids: limit bids describe the hand so closely, in terms of high card points (HCP) and shape, that the one who makes the limit bid is expected to pass on the next round, unless partner makes a forcing bid.
  • Understanding and correct use of limit bids and forcing bids is fundamental to applying the system: all no trump bids below the level of 4NT are limit bids, as are all suit bids that merely repeat a suit already bid by the partnership; changes of suit may be forcing or not depending on the approach bids.
  • The level of the 1NT opening bid influences other bids: the normal choice is between a “weak no trump” (12–14 HCP) and a “strong no trump” (15–17 HCP).
  • All 1 of a suit opening bids then promise at least 4 cards in the bid suit
  • Notrump follow-up conventions include Stayman, Jacoby transfers Blackwood and Gerber Convention.
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