1NT

This bid in the opening position usually indicates that the bidder has a balanced distribution of suits however with some unbalanced hands you will respond 1NT just to keep the bidding low

The distribution of suits in the hand can be in either of the three following patterns5, 3, 3, 2 In any order
or
4, 3, 3, 3 In any order
or
4, 4, 3, 2 In any suit order

However the point count is different and depends on whether the bidder is responding or opening 1NT.

As a responder in both ACOL and Standard American 1NT means 6-9 HCP
As opener in Standard American 1NT is 15-17 HCP

As opener in ACOL 1NT is 12-14 HCP

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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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