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     Acol Bidding System

Acol is one of the oldest bidding systems. System has started to be evolved in a bridge club on Acol street in London, England in the years of 1930s, so it is named after that street. It is mostly played by English bridge players.

Acol is a natural bidding system based on openning bid with minimum 12 HCPs and with the longest suit. NoTrump opennings are generally weak (12-14 HCP). But strong (15-17 HCP) or weak (12-14 HCP) opennings could be preferred according to the partnership agreement. Some Acol players apply strong opennings in vulnerable, weak opennings in nonvulnerable situation. A weak 5 card suit is not an obstacle for NoTrump opennings.  2 Clubs openning is game forcing , the other two level opennings are strong. Acol players who prefer weak two level opennings apply Benjamin convention (See Conventions for detail).   You can examine the rules of opennings and responses for Standard English Acol from the table below.

Second Round Biddings :

Opener	Responder	Opener's Rebid	Points and Distribution
1 Suit	1 Shifting Suit	1 NT  2 NT  3 NT	15-16 HCP  Balanced Hand  17-18 HCP  Balanced Hand  19 HCP  Balanced Hand
	2 Shifting Suit  (without jump)	2 NT  3 NT	15-16 HCP Balanced Hand  17-19 HCP Balanced Hand
1 Minor Suit	Jump Support	3 Shifting Suit	Stopper in that suit, inviting to 3 NT
1 Major Suit	Simple Support	3 Shifting Suit	Ask stopper in that suit, inviting to game
2 Clubs	2 Diamonds	2 NT  3 NT  4 NT	23-24 HCP  Balanced Hand  25-26 HCP  Balanced Hand  27+ HCP  Balanced Hand
1 NT	2 Clubs	2 Diamonds  2 Hearts  2 Spades	No 4 cards Major  4 cards Hearts, may be 4 cards Spades  4 cards Spades, no 4 cards Hearts
	2 Spades	2 NT  Lowest long suit	Minimum openning  Maximum openning
	4 NT	Pas  6 NT	Minimum openning  Maximum openning
	5 NT	6 NT  7 NT	Minimum openning  Maximum openning

 

Opener	Responder	Opener	Responder	Points and Distribution
1 Any Suit	Shifting Suit	3 NT	4 NT  5 NT	Invite to 6NT with maximum openning  Invite to 6 NT with minimum openning, 7 NT  with maximum
2 Clubs	2 Diamonds	2 NT      3 NT	Pass  Same as 2 NT  opennings  4 Clubs	0-3 HCP  4+ HCP    Stayman
2 NT	3 Spades	4 long suit	4 suits  6 NT	11-12 HCP  investigating 4-4 fit  15-16 HCP invites 7 NT with maximum

In the second round bidding tables we have not covered the natural biddings. So you can assume that the bidding not covered in the tables are natural.

In Acol bidding system 4th Suit Forcing convention is spreadly used. (See conventions)