Bridge Bidding System Guide: 2/1, SAYC, Acol + Free Bid Tool

A bidding system in bridge is the set of agreements that tells you and your partner what every bid means: which hands open, how strong a 1NT opening is, and what each response and rebid shows. The systems most players use today are 2/1 Game Force and its simpler relative SAYC, Acol, Standard French, and club systems such as Precision and Polish Club.

The rules of the auction are the same in every system of bidding in contract bridge. What changes from one system to the next is the meaning you attach to each call. This page explains how systems work, walks through every major family, compares them in one table, and gives you a practical way to choose one and learn it with a partner. 2/1 Game Force is the reference system here: when a bid is explained without a system name, it has its 2/1 meaning.

If you have never bid a hand before, start with how bidding works in contract bridge and come back once you know what an opening bid is.

Bridge is a partnership game, and you are not allowed to tell partner what you hold. The only legal way to describe your hand is with bids, and a bid carries information only if both of you agree on what it means. A contract bridge bidding system is that agreement.

A complete system answers four kinds of questions:

• Openings: how many points and how many cards each opening bid shows.
• Responses: what partner's replies show, and which of them partner must not pass.
• Rebids and later rounds: how the auction develops after the first round, all the way to slam.
• Competition: what your bids mean when the opponents bid too.

Your system is not a secret. In every club game and tournament, the opponents are entitled to know your agreements. You fill out a convention card so they can read them, and you explain any call they ask about. Playing a system the opponents cannot find out about is not allowed.

Players mix up the two words all the time, so here is the difference. The system is the skeleton: the opening bids, the strength of 1NT, the length you need to open a major, and the general approach to forcing bids. A convention is one artificial bid with a special meaning that you add to that skeleton.

Stayman is a good example. After a 1NT opening, a 2♣ response asks opener for a four-card major. It says nothing about clubs. Jacoby transfers and Blackwood are other conventions. A weak two bid is not one: it shows the suit it names, so it is natural. You can play Stayman in 2/1, in SAYC, in Acol and in Precision, and in each of them it means the same thing.

So two pairs can both say 'we play 2/1' and still differ on a dozen conventions. When you sit down with a new partner, agree the skeleton first, then go through the conventions one at a time.

A natural bid shows length in the suit you name. 1♠ with five spades is natural. An artificial bid shows something else: a 2♣ opening that shows a very strong hand, or a 1♣ opening that shows 16 or more points and may hold a void in clubs.

Every system mixes the two. Even the most natural one has a few artificial bids, such as the strong 2♣, Stayman and Blackwood. The useful question is where a system puts its artificial bids:

• Natural systems keep almost every opening natural and use one artificial opening, usually 2♣, for the very strong hands. 2/1 Game Force, SAYC and the rest of the Standard American family, Acol and Standard French are all natural systems.
• Strong club systems make 1♣ artificial and strong. Every other opening is then limited, often to about 11-15 points, so partner knows a lot after one bid. Precision, Blue Club and Moscito work this way.
• Multi-way club systems give 1♣ two or three possible meanings, one of them strong. Polish Club is the best known.
• Highly artificial systems go further, with transfer openings, relay auctions where one player asks and the other describes, or even a strong opening pass. They are rare, and many clubs and events restrict them, so check the rules before you bring one to a game.

Natural methods are easier to learn and easier for the opponents to defend against. Artificial methods buy accuracy in some auctions, but you pay for it with memory work, and a forgotten agreement costs more.

The fastest way to see how much the system matters is to give the same hand to six partnerships. You are the dealer and you hold:

♠ A Q 7 4 ♥ K J 3 ♦ K 8 2 ♣ K 6 4 (16 HCP, 4-3-3-3)

• 2/1 and SAYC: open 1NT. It is balanced and inside the 15-17 range.
• Standard French: open 1NT, for the same reason.
• Polish Club: open 1NT. Polish Club also plays a 15-17 notrump.
• Acol: open 1♠. The Acol 1NT is 12-14, so with 16 you open your four-card major and show the strength by rebidding notrump.
• Precision: open 1♣. Every Precision hand with 16 or more points opens 1♣, whatever its shape.

Three different opening bids from the same 13 cards, and each one is correct in its own system. This is why you never judge a call without knowing the system behind it, and why the opponents get to see your convention card before the first board.

There are hundreds of named systems, but almost all of them belong to a handful of families. Learn the families and you can make sense of any convention card you meet.

2/1 Game Force, written 2/1 and said 'two over one', is the standard system of North American tournament players and the default system of the BridgeDummy Bidding Room. It grew out of Standard American, so its openings are the classic American ones:

• 1♥ and 1♠ promise five or more cards.
• 1♣ shows three or more clubs. 1♦ shows four or more diamonds, with one exception: four spades, four hearts, three diamonds and two clubs opens 1♦ (some pairs open 1♣ with that shape instead). With 3-3 in the minors you open 1♣; with 4-4 you open 1♦.
• 1NT is 15-17 balanced and 2NT is 20-21.
• 2♣ is strong and artificial. 2♦, 2♥ and 2♠ are weak twos.
• Over 1NT you play Stayman and Jacoby transfers.

The big rule is in the responses. After a one-level major opening, a new suit at the two level by a hand that has not passed (1♥ - 2♣, 1♥ - 2♦, 1♠ - 2♣, 1♠ - 2♦, 1♠ - 2♥) forces to game. Most pairs want five hearts for 1♠ - 2♥, and some keep it out of the game force: that is a partnership choice. Over 1♦, a 2♣ response is forcing too, and many pairs play it as game forcing.

In 2/1 the two-level response says 'we are going to game, so let us take our time'. With game settled, both of you can bid naturally at a low level and use the spare room to find the best game, or to look for slam.

The cost is the forcing 1NT response. A responder with less than game values who cannot raise or bid a suit at the one level bids 1NT over the major, which covers roughly 6-12 points and asks opener to bid again. Many 2/1 pairs let opener pass it with a minimum balanced hand, a version called semi-forcing. The usual tools on top are limit raises, Jacoby 2NT, splinters and Roman Key Card Blackwood.

Max Hardy's books did much to spread 2/1.

Standard American is the natural system most North American players learn first. Charles Goren's books made point count the standard way to value a hand in the 1950s. His early methods used four-card majors, and five-card majors took over in the decades that followed. Today 'Standard American' means a family of methods: five-card majors, a 15-17 1NT, a strong artificial 2♣ and weak two bids. 2/1 is one member of that family.

SAYC, the Standard American Yellow Card, is one fixed version of it. The ACBL published it so that two strangers can sit down and play with no discussion, and the name comes from the card itself, which was printed on yellow paper. Its openings are the 2/1 openings above (with 3NT for 25-27 balanced, and weak twos of a good six-card suit and about 5-11 HCP). The differences are in the responses:

• A new suit at the two level, such as 1♠ - 2♣, shows about 10 or more points and is forcing for one round only, so both players often have to jump later to show extra values.
• A 1NT response to a major shows about 6-10 points, and opener may pass it.

SAYC is the card you can expect a pickup partner, online or at a new club, to know. The SAYC vs 2/1 article lists every difference.

Acol is the natural system of Britain and Ireland. It began in the early 1930s at a bridge club on Acol Road in London, and Terence Reese named Maurice Harrison-Gray, Jack Marx and S. J. Simon as its main creators. The first Acol book, by Ben Cohen and Terence Reese, came out in 1938.

Acol has two trademarks:

• Four-card majors. You may open 1♥ or 1♠ with only four cards.
• The weak 1NT, 12-14 balanced. It covers the most common opening hand, and it pushes the opponents to the two level if they want to compete.

With 15 or more balanced, you open one of a suit and rebid notrump. A 2NT opening shows 20-22, and 2♣ is the strong, game-forcing opening. The other two-level openings vary from club to club. Traditional Acol twos (2♦, 2♥, 2♠) are strong, with about eight playing tricks. Many players now use weak twos instead, or Benjamin twos, where 2♣ shows the strong one-suiter, 2♦ shows a game force, and 2♥ and 2♠ are weak. The English Bridge Union teaches its own beginner version, Standard English, with the same 12-14 1NT.

Acol is not the only weak notrump system. Kaplan-Sheinwold, an American method from Edgar Kaplan and Alfred Sheinwold, combines a 12-14 1NT with five-card majors. The trade-offs are in weak notrump vs strong notrump and five-card majors vs four-card majors, and the whole system is in the Acol guide.

Standard French is the teaching system of the French Bridge Federation (FFB), known in France as the SEF, short for Système d'Enseignement Français. Its openings sit close to 2/1 and SAYC: five-card majors, a 15-17 1NT, and a minor-suit opening in the longer minor, 1♣ with 3-3 and 1♦ with 4-4. Its two-level responses force for one round, as in SAYC, not to game.

The difference is at the two level, where Standard French has two strong openings. 2♣ is strong and forcing for one round, and 2♦ is a game force. 2♥ and 2♠ are weak twos. Because the federation teaches the same system in clubs across the country and publishes new editions, French players of every level share one base, which makes it easy to find a partner. The details are in the Standard French guide.

A strong club system opens 1♣ with every strong hand, whatever its shape. That one change limits every other opening. When a Precision player opens 1♠, partner knows opener holds at most about 15 points, so many auctions end sooner and with less guessing.

Precision. C. C. Wei, a Chinese-American shipping businessman, developed Precision in the 1960s with help from Alan Truscott. It became famous when a team from Taiwan, playing it, finished second in the Bermuda Bowl in 1969 and again in 1970, and the Italian Blue Team then switched to Precision and won the 1972 World Team Olympiad. Standard Precision looks like this:

• 1♣: 16 or more points, any shape, artificial and forcing. A 1♦ response is the negative, about 0-7.
• 1♦: 11-15, no five-card major and no six-card club suit. In many versions it can be short in diamonds.
• 1♥ and 1♠: 11-15 with five or more cards.
• 1NT: 13-15 balanced. Some pairs play 14-16.
• 2♣: 11-15 with six clubs, or five clubs and a four-card major.
• 2♦: 11-15 and short in diamonds, with 4-4-1-4, 4-3-1-5, 3-4-1-5 or 4-4-0-5 shape.
• 2♥ and 2♠: weak twos.

Jeff Meckstroth and Eric Rodwell, one of the most successful pairs in history, built their own strong club system on the same base. The Precision guide covers the responses and the auctions where the system is weakest.

Blue Club. Benito Garozzo developed the Blue Club for the Italian Blue Team, which dominated world bridge from the late 1950s into the 1970s. Its 1♣ shows 17 or more, and the step responses show controls, where an ace counts two and a king one. The other one-level openings show four-card suits and about 12-16 points. With two suits you often open the shorter one and bid the longer one next, a style called canapé. Its ancestor was Eugenio Chiaradia's Neapolitan Club.

Moscito. Paul Marston and Stephen Burgess of Australia created Moscito in 1985. The name stands for Major Oriented Strong Club, Intermediate (or Intrepid) Two Openings. It opens a four-card major ahead of any minor, uses a strong 1♣, and answers it with relays: one player keeps asking and the other describes the hand step by step. It is a system for dedicated expert pairs, and parts of it are not allowed in many club games.

The whole family, with its strengths and its weak spots in competition, is covered in strong club systems.

Polish Club, called WJ in Poland (Wspólny Język, 'common language'), is the most popular system in Poland, and players in many other countries use it too. Its 1♣ opening has three possible meanings:

• a weak notrump, about 12-14 balanced,
• a natural club hand with five or more clubs and about 15-17,
• any hand with 18 or more points.

Partner first answers as if opener has the weak notrump, and opener shows the stronger types on the rebid. The rest of the system looks natural: 1♦ shows four or more diamonds, 1♥ and 1♠ show five-card majors, and 1NT is 15-17. At the two level, 2♣ is Precision-style (six clubs, or five clubs and a four-card major), 2♦ is a multi that shows a weak two in one of the majors, and 2♥ and 2♠ show weak two-suiters.

The appeal is balance. You keep a mostly natural structure, you get a sharper meaning for 1♦ and the major openings than Standard American gives, and the strong hands still have a home in 1♣. Krzysztof Jassem wrote the standard books, and his WJ 2010 edition later appeared in English as Polish Club International. The Polish Club guide explains the responses.

Polish Club is the best known multi-way club, but the idea of a catch-all minor opening shows up in other systems too. The Precision 1♦ that can be short is one example. Some 2/1 pairs open 1♣ with four spades, four hearts, three diamonds and two clubs, so that their 1♦ always shows four cards.

The table puts the main systems side by side. Ranges are the standard versions; every partnership adjusts a few of them.

Two columns shape the feel of a system more than any other: the 1NT range and the length you need to open a major. A weak notrump with four-card majors (Acol) makes for an aggressive, preemptive style. A strong notrump with five-card majors (2/1, SAYC, Standard French) gives a steadier, more descriptive one. The strong club systems trade both for a different idea: limit every opening except 1♣. For the full opening chart and the exact auctions where the systems split, read bridge bidding systems compared.

Under the different labels, every system works toward the same targets, which is why your bridge sense carries over when you switch.

• The point targets. About 25 combined high card points for 3NT or four of a major, 28-29 for five of a minor, about 33 for a small slam and 37 for a grand slam. Every system is a set of tools for finding out whether your side has them.
• Hand evaluation. Shape adds value in every system. Hand evaluation, the rule of 20 for borderline openings and the losing trick count apply whatever card you play.
• Forcing and limit bids. Every system sorts bids into those partner may pass and those partner must answer. Most auction disasters come from a bid one player thought was forcing and the other passed.
• The major-suit fit. Every system tries to find an eight-card major fit first, then notrump, then a minor.
• The shared tools. Stayman, transfers, Blackwood, reverse bids and takeout doubles exist in nearly every system, often with the same meaning.

There is no best system in the abstract. Pairs have won world titles with natural systems and with strong club systems, and no simulation or match record has settled the argument. The best system for you is the one that fits three things:

1. Your partner. A simple system you both know beats a clever one that only one of you remembers.
2. Where you play. Pick what your club plays: 2/1 (or SAYC) in North America, Acol in Britain, Standard French in France, Polish Club in Poland. You will read the opponents' auctions faster, and you will always find a partner.
3. How much time you have. A natural system takes a few weeks to learn well. A strong club system takes months, and it needs regular practice, because a forgotten agreement in a relay auction costs far more than a forgotten agreement in a natural system.

My advice to most club players in North America: learn 2/1 Game Force from the start. Its openings are the same as SAYC's, so you can still play with any pickup partner, and the game-forcing two-over-one response solves real problems on hands you meet every session. In Britain, learn Acol. Take up Precision or Polish Club only when you have a regular partner who wants to put in the hours with you. The full case for each choice is in best bridge bidding system.

Most players learn a system by reading a book alone and then finding out at the table that partner read a different chapter. Here is a method that works better.

1. Start from a published card. Take a standard 2/1 card, SAYC, or your federation's teaching system as the base. Agree that anything you have not discussed is played as on that card.
2. Fill in a convention card together. Do it side by side, line by line.
3. Learn one layer at a time. Openings first, then responses, then opener's rebid. Give each layer a week of practice before you add the next.
4. Keep the convention list short. Stayman, transfers, Blackwood and takeout doubles are enough for the first months. Add a convention only when a real hand shows you need it.
5. Bid practice hands together. Deal hands, bid them without talking, then compare what each of you thought every call meant.
6. Review every accident. After each session, find the auction that went wrong, decide who was right, and write the agreement in your notes.
7. Practice against robots that play the system. You get dozens of auctions a night without waiting for a game.

If you came here for the basics of bidding rather than for systems, here they are. The dealer bids first, and the auction goes clockwise. Each bid names a level from 1 to 7 and a strain: clubs, diamonds, hearts, spades or notrump, in that order from lowest to highest. A bid of 3♥ promises nine tricks (six plus the level) with hearts as trumps. Every bid must be higher than the last one. Once someone has bid, three passes in a row end the auction; if all four players pass at the start, the deal is thrown in. You count high card points (ace 4, king 3, queen 2, jack 1), and about 12 of them are enough to open.

That is the frame every system fills in. The full beginner walk-through is in how to bid in bridge, the openings are in bridge opening bids, and partner's replies are in responding to opening bids.

The free Bid Meaning tool shows what a call means in 2/1 Game Force, SAYC, Acol, Precision and Polish Club, side by side. Enter the auction so far, and it explains the last call in each system, using the EPBot engine's system cards: the same robots you bid with in the Bidding Room.

Three auctions to start with:

• See what 2♣ means after a 1NT opening: the Stayman ask, while the 1NT it answers is 15-17 in 2/1 and 12-14 in Acol.
• See what 1♠ - 2♣ means: game forcing in 2/1, forcing one round in SAYC.
• See what a 1♣ opening means: a natural club in 2/1, 16 or more with any shape in Precision, and one of three hand types in Polish Club.

Use it when an opponent's alert puzzles you, when you and partner disagree about a call, or when you want to see how a new system treats an auction you know.

Reading about a system and bidding it are two different skills. BridgeDummy gives you three good ways to close the gap.

• The Bidding Room deals random boards and seats you with EPBot robots that play your choice of five systems: 2/1 Game Force, SAYC, Acol, Precision and Polish Club. You set your side's system and the opponents' system separately, so you can bid Precision against a pair playing Acol and see what their weak notrump does to your auctions. After each board you see how the contract you reached compares with the other contracts available on that deal. With a friend, open the partner tab: the two of you bid North-South, each on your own device, against robot opponents.
• The bidding puzzles give you one real decision at a time. You are South and you choose one call. The hidden hands are dealt hundreds to thousands of times to fit the auction, every option is solved double dummy, and your call gets 1 to 5 stars, in matchpoint or IMP versions.
• What should I bid? takes your hand and the auction so far and shows the call the EPBot engine makes in the system you choose, with the meaning of that call.

The fastest way I know to learn a new system: read one section of its guide, then bid twenty boards in the Bidding Room in that system and look hard at every auction where the robots surprised you.

System guides

• Acol bidding system
• Standard French bidding system
• Precision Club system
• Polish Club system
• Strong club systems
• Kaplan-Sheinwold system
• Bridge World Standard

Comparisons

• Best bridge bidding system
• Bridge bidding systems compared
• SAYC vs 2/1
• Acol vs 2/1
• Precision vs 2/1
• Five-card majors vs four-card majors
• Weak notrump vs strong notrump

Tools for your partnership

• How to write a bidding system

New to bidding

• How to bid in bridge