200: The Acol Bidding System

The Acol bidding system is primarily associated with bridge players in the United Kingdom, although it's also used in some other English-speaking countries like Australia, New Zealand, and South Africa. While it may not be as widely used internationally as some other bidding systems like Standard American or Precision, Acol remains popular in these countries, particularly among social and club players. In bridge, the Acol bidding system is straightforward for beginners. It's called a "natural" system because most bids are based on the strength and length of your cards. Opening Bids: When you start bidding, you usually need at least four cards in the suit you're bidding. If you don't have a long suit, you might bid a balanced hand with no long suits. Responses and Re-bids: When your partner makes an opening bid, you respond based on your own hand. Again, you generally need four or more cards in the suit you're bidding. You tell your partner about your hand's strength and any good suits you have. No Trump Bids: If you don't have a long suit, you might bid "no trump." This means you have a balanced hand without a strong preference for any suit. Acol is a simple system that helps beginners communicate with their partner effectively during the bidding phase of the game.

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.