Standard French Bidding (SEF): Majeure Cinquième Explained

Standard French bidding is SEF, the Système d'Enseignement Français: the five-card major system that the French Bridge Federation teaches to new players. It opens five-card majors (majeure cinquième), the better minor, a 15-17 1NT, a strong 2♣ called fort indéterminé, a game-forcing 2♦, and weak twos in hearts and spades.

If you play 2/1 or SAYC, SEF will feel close to home: the one-level openings, the notrump range and most conventions are nearly the same, and its two-level responses work the SAYC way. The differences sit in the strong openings, in a few response ranges, and in the French names for familiar tools. This guide covers all three, with sample auctions and two quizzes.

SEF stands for Système d'Enseignement Français, the "French teaching system". The French Bridge Federation (Fédération Française de Bridge, the FFB) publishes it and revises it every few years, so French books and club handouts often name the edition year next to it.

SEF grew out of the French five-card major tradition, and in France the phrase majeure cinquième ("fifth-card major", meaning a major of at least five cards) is almost a synonym for the system. Because nearly every French club player learns SEF first, it works like SAYC in the United States or Standard English Acol in Britain: a default you can play with anyone, with no discussion beyond "SEF?"

French teaching also has its own way of counting the hand, which you will see on every handout:

• H points are the usual high card points: ace 4, king 3, queen 2, jack 1.
• L points add length: one point for each card beyond four in a suit, so a six-card suit adds two.
• D points are added for shortness once a fit has been found.

So "12 H" means 12 high card points, and "14 HL" means 14 with length counted. The ranges below use plain points; where French books say HL or HLD, the idea is the same as adding a little for shape in hand evaluation.

The minor suit rule is simple. With no five-card major, open your longer minor. With three cards in each minor, open 1♣. A hand with four spades, four hearts, three diamonds and two clubs opens 1♦, so 1♦ can be a three-card suit in SEF, just as in 2/1 and SAYC.

Where 2/1 and SAYC put every big hand into one strong 2♣, SEF splits them in two:

• 2♣ fort indéterminé ("strong, undefined"). Responder almost always relays with 2♦. Opener then shows the hand: 2NT shows 22-23 balanced and is not forcing, while a suit shows a strong hand with that suit. Responder can stop below game when opener has the weaker type and responder has nothing.
• 2♦ forcing de manche ("game forcing"). This is the monster: about 24 or more, or a hand that makes game by itself. Responder's 2♥ is the negative; other responses are natural and show some values. Nobody passes until game.

The split helps on the biggest hands: once partner hears 2♦, both of you know game is certain and can spend the bidding space on slam. The cost is the weak 2♦. SEF has weak twos only in the majors, so a weak hand with six diamonds has to pass or preempt at the three level. None of the five robot systems in the free Bid Meaning tool plays SEF, but you can compare the 2♦ opening in 2/1, SAYC, Acol, Precision and Polish Club to see how differently each system uses it.

Responses to a one-level major opening:

The key point for American players: SEF's two-over-one is forcing for one round, not to game. That is the SAYC treatment, not the 2/1 Game Force treatment. A two-level new suit promises about 11 or more, and responder can stop in a partscore on the next round if opener is minimum and no fit appears. Compare 1♠ - 2♥ in SAYC and 2/1: the SAYC meaning is the one closest to SEF.

Over 1NT, SEF uses Stayman and transfers (more on the French names below). Over 2NT, the same tools move up a level.

North opens 1♠ with five spades and 14 points. South has 12 points and five hearts, so South bids 2♥: forcing for one round, and over 1♠ it promises five cards. North holds three hearts, which makes an eight-card fit, and raises to 3♥. South has an opening hand opposite an opening hand and bids 4♥.

The same auction works in SAYC. In 2/1 Game Force, South's 2♥ would already have set up a game force (for the many pairs who keep 1♠ - 2♥ game forcing), so North could raise more slowly. The result is the same contract; the difference is how much each bid promises along the way.

Most SEF conventions are the ones you already know, sometimes under a French name:

• Stayman. 2♣ over 1NT asks for a four-card major, as in the Stayman convention.
• Texas. The French word for a transfer. Over 1NT, 2♦ asks opener to bid 2♥ and 2♥ asks for 2♠, exactly like Jacoby transfers.
• Roudi. After 1 of a suit, a one-level response and opener's 1NT rebid, responder's 2♣ is an artificial checkback that asks opener to describe the hand further. It is named after Jean-Marc Roudinesco.
• Quatrième couleur forcing. Fourth suit forcing: responder's bid of the fourth suit is artificial and forcing.
• Blackwood 5 clés. Five key card Blackwood, the French form of Roman Key Card Blackwood.
• Splinters to show a short suit and support.
• Bicolores in competition: Michaels cue bids and the Unusual 2NT for two-suited overcalls.

SEF and SAYC are close cousins: an SAYC player can sit down with an SEF partner after five minutes on the 2♣ and 2♦ openings and the French names. A 2/1 player has one more change to make, the two-over-one that is forcing for one round only. And an Acol player has to swap four-card majors and the weak notrump for five-card majors and 15-17. For how every system fits together, see the bridge bidding system guide.

Strengths

• A natural, well-documented base that is easy to learn.
• The 2♦ game force gives the biggest hands room for slam.
• The 15-17 notrump and five-card majors make the opening bids reliable.
• In France and among French players, everyone knows it, so you always have a partner.

Weaknesses

• No weak 2♦: a six-card diamond suit has to preempt at the three level or pass.
• 2♣ covers two different hand types, so responder learns less on the first round.
• A two-over-one that is forcing for one round leaves some sequences ambiguous about game, where 2/1 Game Force is clearer.
• 1♦ can be a three-card suit, as in any better-minor system.

SEF is the system of French clubs and of the French federation's teaching, so it is what most French players learn first and many play for life. You also meet it wherever French-speaking players gather, including online. Many French tournament pairs build on SEF and add their own agreements, such as a game-forcing two-over-one or different two-level openings, so even expert French methods often look familiar to an SEF player.

The Bidding Room on BridgeDummy has five robot systems, and SEF is not one of them. The closest is SAYC: five-card majors, a 15-17 1NT, weak twos in the majors, a strong 2♣ and a two-over-one that is forcing for one round. Set your side to SAYC, sit South with a robot partner, and bid random deals. Keep two differences in mind: the robots' 2♦ opening is a weak two, and their 2♣ covers all strong hands. After each auction, your contract and the alternatives are solved double dummy on up to 20 layouts that fit the bidding, so you see the average score of each contract next to yours.

For judgment problems that do not depend on the system, try the bidding puzzles: you are South, you choose one call, and every option is scored double dummy across the deals that fit the auction. The judgment you build there (when to raise, when to compete, when to stop) carries straight over to SEF.

A short study plan:

1. Learn the opening table above until you can recite it, especially 2♣, 2♦ and 2NT.
2. Bid 20 deals with SAYC robots and, before each call, ask what SEF would bid instead.
3. Write the French names (Texas, Roudi, quatrième couleur, 5 clés) on your card so you recognize them at the table.