The Open Championship Format Explained For British Fans

Prestwick, October 1860. Eight professionals played three circuits of a twelve-hole course in a single day, Willie Park senior returned 174, and that was the entire championship. The distance asked of an entrant has grown a good deal since. The principle has not moved an inch. Everybody plays the same holes in the same weather, the strokes are added together, and the lowest total wins.

That sounds almost too plain to need explaining, and for the first two days it more or less is. The interesting part is everything built around it: how 156 places are allocated, why the cut lands where it does rather than at a set number under par, how the R&A rebuilds the field into pairs on Saturday morning, what happens when a siren goes off at half past three on a Friday afternoon, and why a golf course beside the sea needs local rules that would be meaningless at Wentworth. The format is not complicated. It is specific, and the specifics are where the championship lives.

Seventy-two holes, and why the R&A has never shortened them

The Open was a 36-hole event for its first three decades. It went to 72 holes in 1892, when it was played at Muirfield, and the number has not been touched since. Four rounds of stroke play is now so standard across professional golf that it barely registers as a choice, but it was a deliberate one. Thirty-six holes over a single day rewards a hot morning, and the committee wanted a test that could not be won by one good stretch.

The scheduling around those 72 holes has changed far more than the 72 holes themselves. For most of the twentieth century the championship was compressed, with two rounds crammed into the final day. It became a four-day event in 1966. It first finished on a Sunday in 1980, which is the arrangement everybody now takes for granted and which exists largely because television wanted it.

• 1860First championship
• 1892Extended to 72 holes
• 1966Became a four-day event
• 1980First Sunday finish

Milestones from the championship's documented history, not figures taken from any single year.

Stroke play over four rounds does a particular job. It makes recovery possible without making it easy. A player who opens with a 76 in a squall is not eliminated, because 54 holes remain and the wind may turn, but nor are they handed the fresh start that a matchplay draw would hand them. The Amateur Championship, run by the same governing body, is decided by matchplay after a stroke play qualifying stage, and the two competitions produce visibly different sorts of winner. Matchplay rewards nerve across a single afternoon. Seventy-two holes of stroke play rewards a player who can make a bogey and then decline to compound it.

There is a second reason the R&A has stayed put. Links courses are the most weather-dependent in golf, and four rounds spread across four days is the only practical way of giving the draw some chance of evening out. It rarely evens out completely. Half the field can catch a benign Thursday morning and a brutal Friday afternoon, and no format corrects fully for that. Four rounds at least gives the imbalance more opportunities to unwind than two ever could.

The 156-player field and how the places are divided

The field is 156. That figure is not arbitrary. It is roughly the maximum a single-tee start can push around a links course inside one July day, which is the constraint that shapes most of the championship's logistics.

Those places arrive by two routes, and the split matters. Most of the field is exempt, meaning a player has earned a place through a published category and never has to play a qualifying round. The categories run to a couple of dozen and cover past Open champions up to a specified age, recent winners of the other three majors, leading finishers in the previous Open, positions on the world ranking, order of merit and points-list positions on the main professional tours, and a handful of amateur titles including the Amateur Championship and the leading position on the world amateur ranking. The precise wording and the cut-off dates are republished by the R&A every year, and they do get amended. The full breakdown sits in our guide to the Open's exemption categories.

Everything left over goes to qualifiers. Some of those places are won at Final Qualifying in Britain, played over 36 holes in a single day at a set of links venues a fortnight or so before the championship. Others come through the Open Qualifying Series, a set of designated tournaments on tours around the world where the leading finishers not already exempt pick up a place. If you want the whole ladder, from a club entry form to a championship tee time, it is set out in how Open Championship qualifying works.

The proportion shifts year to year. A championship in which several exempt players withdraw pulls more names off the reserve list. A year with an unusual number of first-time exempt winners squeezes the qualifying allocation. What does not shift is the total. If 156 is the number, 156 tee off, and the last place is filled on the Wednesday if it has to be.

1. 1Exemption categoriesThe bulk of the field, through published categories covering past champions, major and tour finishers, world ranking positions and a handful of amateur titles.
2. 2Open Qualifying SeriesLeading finishers not already exempt at designated tournaments on tours around the world pick up a place.
3. 3Final QualifyingThirty-six holes in a single day at British links venues, played a fortnight or so before the championship.
4. 4The tee sheetThe total does not move. If the number is 156, then 156 tee off, and the last place is filled on the Wednesday if it has to be.

The structure of the entry system as published by the R&A, not a count of places from any one championship.

Reserves and how a late withdrawal is filled

Qualifying produces an order, not simply a list of successful players. Those who finish immediately behind the qualifying places at each venue become first, second and third reserve for that venue, and the R&A works down the reserve list in a published order whenever an exempt player pulls out. Withdrawals are commonplace — an injury in the week before, a family matter, a player who arrives, plays nine practice holes and decides a wrist will not hold up. The consequence is that a reserve can find out on the Tuesday or Wednesday that they are in the field, which is why reserves turn up at the venue and practise as though they were playing. Some drive several hundred miles to sit in a car park and then drive home again.

The 36-hole cut and the top-70-and-ties rule

After two rounds the field is reduced to the leading 70 players and everyone tied with the seventieth. There is no target score. The line falls wherever the seventieth player's 36-hole total happens to fall, which is why a cut at The Open can sit at level par one year and eight over the next without a word of the regulations having changed. The weather sets it.

The ties provision is the part people underestimate. If eleven players share seventieth place, all eleven play the weekend and the field goes to 80. The R&A does not trim it back afterwards. Some tours apply a secondary reduction when a cut produces an unwieldy field. The Open, at present, does not, which is why a bunched Friday can leave a noticeably larger weekend field than the number 70 implies. The exact figure and any accompanying provisions are set annually in the conditions of entry, and both have been altered at various points in the championship's history, so treat the current arrangement as current rather than eternal.

Championship	Field	Cut after 36 holes
The Open	156	Leading 70 and ties
The Masters	Invitational, smaller field	Leading 50 and ties
US Open	156	Leading 60 and ties
US PGA Championship	156	Leading 70 and ties

Missing the cut is a hard stop. There is no consolation round, no secondary flight, nothing to play for on Saturday. A player who misses goes home on Friday evening with no official finishing position and, in most exemption systems, nothing counted towards the following year's entry. For a qualifier who spent a spring getting through two stages, the gap between a par and a bogey at the 36th hole is the gap between a full championship and a two-day one.

Why the cut line moves so much at links venues

The spread of 36-hole scores at The Open is usually wider than at the American majors, and the reason is wind rather than course length. A parkland set-up produces a narrow band of scores because conditions barely change between the first group and the last. On an exposed links, a morning starter in eight miles an hour of breeze and an afternoon starter in twenty-five are effectively playing two different golf courses. The cut line absorbs all of that. Predicting it before Friday afternoon is a waste of breath.

The three-hole aggregate playoff

If two or more players are tied on the lowest 72-hole total, the championship goes to a playoff over three designated holes, with the lowest combined score across those three holes winning. Should the tie survive that, the players continue hole by hole in sudden death until it breaks.

The current arrangement is the third the championship has used. Until 1988 a tie meant an 18-hole playoff the following day, which produced some famous Mondays and one obvious problem: it asked spectators, broadcasters and players to reassemble for a fifth round that might be effectively decided within twenty minutes if somebody made an early mess of it. From 1989 the R&A moved to a four-hole aggregate, used for the first time at Royal Troon. From 2019 that was reduced to three.

The holes are nominated in advance rather than picked on the night, and the choice is a genuine piece of course design in miniature. A good three-hole set gives the players at least one hole where an aggressive line is available and at least one where it is not, so a leader cannot simply play three defensive pars and dare the field to beat them. An aggregate rather than sudden death also means a player who loses a hole is not eliminated by losing it, which is the entire argument for the format. One bad bounce off a pot bunker lip should not end a championship that has taken four days to reach that point.

Period	Playoff format
Until 1988	18 holes, played the following day
1989 to 2018	Four-hole aggregate
2019 onwards	Three-hole aggregate, then sudden death

The other majors have each landed somewhere different. The Masters goes straight to sudden death. The US PGA also uses a three-hole aggregate. The US Open abandoned its full 18-hole Monday playoff in 2018 in favour of two holes. Nobody has convincingly argued that one of these is correct and the other three are wrong. They are four answers to the same question: how much golf does a tie deserve.

Tee times, the draw and the single-tee start

Here is the detail that separates The Open from the other three majors, and it is a consequence of geography rather than tradition. In rounds one and two the entire field goes out from the first tee. There is no second wave off the tenth. Fifty-two groups of three, leaving at intervals of roughly eleven minutes, stretch from soon after half past six in the morning until late in the afternoon, and the only reason it is possible is that a British links in mid-July has daylight to spare at both ends of the day.

The draw splits into an early half and a late half, and it reverses for the second round. A player who went out at seven on Thursday goes out in the afternoon on Friday. That reversal is the championship's only mechanism for fairness in the draw, and it is a partial one. It corrects for a course that firms and quickens through the day. It cannot correct for a front that arrives at lunchtime on Thursday and clears overnight.

A two-tee start is not the norm here, common though it is elsewhere. It is a tool the committee holds in reserve. When a championship falls badly behind — a thunderstorm evacuation, fog that will not lift, a delay that eats two hours from a schedule with no slack in it — the options are to start groups from both the first and tenth tees, to send players out in threes at the weekend rather than pairs, or to shorten the intervals. All three have been used. In 2015 at St Andrews the championship lost most of a day to wind and rain and finished on the Monday. In 1988 at Royal Lytham weather pushed the finish back the same way.

One tee also gives the championship something the other three majors have given up. Every player in the field walks past the same starter, hears their name read out from the same box, and hits the opening shot of their week off the same square of turf, in front of a grandstand that is full from the first group of the morning to the last of the evening. Small on a scorecard. Not small to stand in. A two-tee start halves the thing, which is a further reason the committee treats the single tee as the default and reaches for the alternative only once the schedule has already gone wrong.

What the early and late draws actually feel like

The first group off on a Thursday plays a course that has been cut and rolled in the dark and not yet walked on. Greens are at their smoothest and their slowest, the wind is usually at its lightest, and the pins have been in position for perhaps two hours. By four in the afternoon those same greens have taken 150 pairs of spikes, the surfaces have dried in the breeze, and putts that rolled true at seven o'clock now bobble over old marks. Neither half of the draw is reliably better. Both are different enough that players discuss the draw as though it were a competitor.

How the pairings are rebuilt after each round

Rounds one and two are played in threes and the pairings are drawn rather than seeded, which is why the opening two days throw up combinations nobody would ever design. A past champion, a tour journeyman and a nineteen-year-old amateur walk eighteen holes together with almost nothing in common beyond a starting time.

From Saturday the structure changes. The reduced field plays in pairs, and the order is score-based: the highest 36-hole scores go out first, the leaders go out last. The exercise repeats on Sunday morning using the 54-hole scores. Two consequences follow. The first is practical, since pairing on score keeps the leaders together on the course and lets the day build towards one final group, which is as much a broadcasting decision as a sporting one. The second is competitive. A leader playing alongside the nearest challenger sees every shot that challenger plays. A player four groups ahead sees a scoreboard, at whatever interval they choose to look at one, and has to guess at the rest.

Ties within the re-pairing are broken by a published order, generally reverting to the previous round's score and then to the original draw. The composition of the final group on Sunday afternoon is therefore not a matter of anybody's judgement. It is arithmetic, applied identically every year.

Intervals tighten at the weekend as well. Pairs move faster than threeballs, so the reduced field can be sent out at shorter gaps and still finish inside the afternoon, which is what allows a Saturday or Sunday round to start considerably later than a Thursday one. If the committee needs to buy back time after a delay, restoring threeballs at the weekend is one of the first adjustments available, because it compresses the same number of players into a much shorter window. It changes the rhythm of the day for the leaders, who then have a third card to watch rather than one, but it is a small price against losing a round entirely.

Cards, markers and the recorders' hut

A leaderboard is not the score. The score is a piece of card in a hut behind the eighteenth green, and until it has been checked and signed the championship does not formally know what anybody has shot.

Each player in a group keeps the card of one of the others. That marker records the hole-by-hole gross scores and hands the card back at the end of the round, the player checks the figures, and by certifying the card the player takes responsibility for every one of them. The Rules of Golf put that obligation on the player rather than the marker and it is not a formality. Return a card showing a lower score than was actually taken on a hole and the penalty is disqualification. Return one that is too high and the higher figure stands, which has cost people a good deal more than a stroke over the years.

The R&A and the USGA softened one edge of this in the 2019 revision. A player who signs for a score that is too low only because of a penalty they did not know about when they handed the card in is no longer thrown out of the championship; the missing penalty strokes are applied to the score instead. That change followed a run of televised cases in which a viewer's telephone call, hours after the event, cost a professional a tournament. The arithmetic obligation is untouched. Add the holes up wrong and the old consequence still applies.

Running alongside the paper is a second and much faster system. Walking scorers travel with every group and enter each shot on a handheld unit, and that is what feeds the on-course boards, the app and the television graphics. It is quick and it is unofficial. When the two disagree — a scorer takes a chip for a putt, two holes get transposed, a penalty is entered late — the card is right and the screen is wrong, and a player's position can move after they have left the course.

The recorders' area on a Friday evening is one of the quieter corners of a championship. Players who believe they are on the wrong side of the cut sign anyway and then wait, because the line is not fixed until the last group is in and the seventieth score is known. Somebody two outside at six o'clock is occasionally inside at half past eight, having done nothing whatever except watch the wind get up on somebody else's back nine.

Tees, pins and the daily answer to the forecast

A links course is set up in the morning for the wind that is coming, not the wind that came yesterday. That is the single largest difference between championship golf on the coast and championship golf inland, and it is why the same hole can play as a driver and a wedge one day and a driver and a fairway wood the next.

The championship committee has three levers. It can move the tee markers, sometimes by fifty yards or more on a par four where a forward tee brings the green into range and a back tee removes the option entirely. It can move the hole location, which on a links green with real internal contour changes the shape of the required approach rather than merely its length. And it can choose to do neither, leaving a hole exactly where it stood and letting the weather supply the variation on its own.

What the committee cannot do is water the course into submission. Links turf sits on sand, drains within minutes and firms up in a breeze, and the character of the whole test depends on the ball running out. Softening it to make scoring more predictable would remove the reason for going there in the first place. That argument is set out at greater length in our piece on why The Open is played on links, and the day-to-day mechanics are unpicked in how the R&A sets up an Open course.

One thing worth watching. A forward tee on a driveable par four is rarely generosity. It usually means the committee has found a hole location where the aggressive line is genuinely dangerous, and would quite like to see how many players take it on anyway.

Suspensions, the siren protocol and finishing a delayed championship

Play is stopped by siren, and the signals are standardised within the Rules of Golf rather than invented for the occasion. One prolonged note means an immediate suspension for a dangerous situation, typically lightning, and a player must stop at once — mid-swing if that is where the note catches them, and certainly without completing the hole. Three consecutive notes mean a normal suspension, and a group already on a hole may finish that hole before coming in. Two short notes mean play will resume.

The distinction between the two suspension types carries more weight than it looks. Under an immediate suspension a player marks the ball and leaves, then resumes from that exact spot whenever the horn sounds again, however many hours later that turns out to be. Under a normal suspension the group has a choice about completing the hole. Getting the difference wrong carries a penalty, which is why you will see caddies stop dead in the middle of a fairway conversation the moment a siren sounds.

1. 1One prolonged noteImmediate suspension for a dangerous situation. Play stops at once, even in the middle of a hole, and the ball is marked and lifted.
2. 2Three consecutive notesNormal suspension. A group already playing a hole may complete that hole before coming in.
3. 3Two short notesPlay will resume. Players go back to their marked positions and restart from exactly where they stopped.

The signals as standardised in the Rules of Golf, not a protocol written for one championship.

Completing a delayed championship is the committee's problem and the toolkit is limited: earlier starts, two-tee starts, threeballs at the weekend, and if necessary a Monday finish. The R&A's evident preference is to complete all 72 holes even at the cost of running into a fifth day. A championship reduced below 72 holes would be a last resort rather than a plan, and in practice the daylight available in Britain in July gives the committee considerably more room to recover than most tournaments anywhere else in the world.

Local rules that only make sense on links land

Every championship publishes a local rules sheet, and The Open's is unusually specific because the ground is unusual. Several recurring items are worth knowing if you are watching.

Boundaries are frequently walls, fences or roads rather than white stakes, and they are often in play from the fairway. The best-known example in championship golf is the wall and road at the seventeenth on the Old Course at St Andrews, where the road itself forms part of the course and is playable while the ground beyond the wall is out of bounds. On the English rota, boundary walls and railway land at Royal Lytham and Royal St George's do comparable work. These are not hazards in any technical sense. They are simply the edge of the world, and a ball beyond them costs stroke and distance.

Revetted bunkers get no special treatment whatever. A ball under a stacked turf face is an ordinary ball in a bunker, played under the ordinary bunker rules, and if it cannot be advanced the options are an unplayable ball with the associated penalty or a sideways chip out. There is no free relief for an unfortunate lie. That is precisely why the faces are built that way.

Gorse, marram and heavy rough are ordinary ground rather than penalty areas, so a ball lost in them is lost and the player walks back. That single fact explains a great deal of what you see players do off the tee at Birkdale.

Grandstands, television towers, cabling and scoreboards are temporary immovable obstructions, and a specific local rule gives relief from them, including relief from a line of sight in some circumstances. On a course where the crowd is banked into a dune, that rule is used dozens of times a day. And under the current Rules of Golf a ball at rest that is moved by the wind is played from its new position with no penalty, which on an exposed green in a gale is far from a trivial provision.

The Open format against a standard DP World Tour week

Set the championship beside an ordinary tour event and the differences are smaller than the atmosphere suggests, though they are real.

Element	The Open	Typical DP World Tour event
Rounds	72 holes, stroke play	72 holes, stroke play
Field	156	Commonly 144 to 156
Cut	Leading 70 and ties	Commonly leading 65 and ties
Playoff	Three-hole aggregate	Usually sudden death
Entry	Exemption categories plus qualifying	Tour category ranking and invitations
Rounds one and two	Single-tee start, groups of three	Usually a two-tee start

The format is the same shape. What differs is the entry route, the size of the weekend field, and the playoff. The last of those is the most telling. A tour event resolves a tie as fast as it can, because there is a flight to catch and a golf course to hand back, while The Open builds in three holes on the grounds that the trophy is worth the extra half hour. English tour weeks and where they sit in the season are covered in our guide to DP World Tour events in England.

Sunday evening: the Silver Medal, the Claret Jug and the order of presentations

The prize-giving happens on or beside the eighteenth green, within a few minutes of the final putt, and it follows a fixed sequence rather than a script written on the night.

The leading amateur to complete all 72 holes receives the Silver Medal, and that presentation comes before the champion's trophy. An amateur who misses the cut receives nothing, however well placed they stood on Friday evening, which is why the medal is a genuinely difficult thing to win and why the list of past recipients so often reads like a preview of the professional game a decade later. Justin Rose's fourth place at Royal Birkdale in 1998, at seventeen and still an amateur, remains the benchmark performance. The wider story is told in amateurs at The Open and the Silver Medal.

Then the champion. The winner is announced as the Champion Golfer of the Year, receives the Claret Jug and a gold medal, and is expected to speak. The jug itself returns to the R&A before the following championship, while the winner keeps a replica and the medal permanently. The trophy has been presented since 1873, having replaced the Challenge Belt that Young Tom Morris won outright, and it is the same object handed over every July.

What the format asks that the other three majors do not

Strip away the ceremony and the format makes three demands the American majors largely do not.

It asks a player to score in wind, which is a different skill from scoring in benign conditions and one that extra distance improves surprisingly little. It asks them to accept an unfair draw without unravelling, because half the field will get the better half of the weather and there is no mechanism at all to compensate. And it asks for a ground game — running approaches into firm greens, judging bounces off slopes, reading contours that a target-golf education never taught them to see.

Those demands are why the list of champions is more varied than the world ranking would predict, and why a player who has never contended at Augusta can be genuinely dangerous at Sandwich. The starting point for understanding any of it is the ground itself, which is where our introduction to links golf in England picks up. There is more on the wider English game across our golf coverage, and the full set of regional guides sits on the England hub.