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Give genuinely doubtful line calls to the opponent
In matches without line judges — recreational, club, and many amateur tournaments — players call their own lines. On any genuinely uncertain call, the convention is to award the point to the opponent. Taking an ambiguous call in your own favor is a significant breach of trust and widely condemned.
Call your own service faults in recreational and club play
In social and club matches without service judges, a player who knows their own serve was illegal — shuttle too high at contact, racket head above wrist, feet not grounded — is expected to call the fault. Badminton's complex service rules make self-policing a meaningful honesty test; hiding known faults is considered cheating.
Do not make distracting sounds or movements during an opponent's stroke
Intentionally coughing, shouting, making sudden movements, or otherwise attempting to break an opponent's concentration at the moment of play is broadly condemned as gamesmanship. The unwritten rule extends beyond BWF's written prohibition on deliberate hindrance to cover any behavior clearly intended to unsettle an opponent's shot.
All players competing at BWF-sanctioned events are subject to the BWF Anti-Doping Regulations, which conform to the World Anti-Doping Agency (WADA) Code. Testing may be conducted in-competition or out-of-competition.
Why people argue about this
People often assume that anti-doping tests in badminton are only conducted during matches, which is a common misconception since BWF regulations allow for out-of-competition testing as well, potentially catching athletes at times when they're not playing games.
Play shall be continuous from the first service until the match is concluded, subject only to the intervals provided under Law 16. A player must not delay play deliberately.
— Law 16
Why people argue about this
People often assume that a player can take as long as they want between points without penalty, thinking it's just about point scoring efficiency. But actually, the rule strictly mandates continuous play from serve to serve, with no deliberate delays allowed under penalty.
Floor surface: Courts shall have non-slip surfaces. Wet or slippery courts must be dried or treated before play commences. Players may request a delay if they consider the court surface unsafe, and the umpire shall consult the referee.; Lighting: Adequate and uniform lighting is required across t...
Why people argue about this
People often assume that they can use any part of the court for their warm-up, leading them to argue about which exact area should be used during that 5-minute period. The confusion arises because the official verdict specifies a standard 5-minute warm-up on the match court, not allowing players to choose their own preferred areas within it.
The court dimensions are specified in Law 1 of the BWF Laws of Badminton. The court shall be a rectangle marked out with lines 40 mm (1.57 in) wide.
— Law 1
Why people argue about this
People often assume that the 40 mm line measurement refers to the width of the net itself rather than the distance from the net to the sidelines where players hit the shuttlecock. The confusion arises because they overlook the fact that these lines are part of the playing area, extending 15 cm (6 inches) onto each side of the net, defining the court boundaries accurately.
The BWF does not mandate a specific court surface material; however, international and major tournaments are played on wooden (parquet) or synthetic sport surfaces approved by the BWF. The playing area must be free from obstructions.
Why people argue about this
People often assume that badminton courts must be made of wood like a traditional ping pong table, which leads them to argue about wooden flooring being mandatory when in fact, the BWF only requires approved surfaces and no specific material is specified. The confusion arises because they mix up badminton with another sport's equipment.
The BWF publishes and maintains an approved list of shuttlecocks for use in BWF-sanctioned tournaments. Rackets used in play must conform to the specifications in Law 3.
— Law 3
Why people argue about this
People often assume that any shuttlecock will do as long as it flies well, but in reality, only those on the BWF's approved list can be used in official tournaments, which means players must check and ensure their shuttlecocks are compliant with the specs to avoid disqualification.
Rackets found to be broken, cracked, or structurally compromised must be replaced before the next rally. Players are responsible for maintaining their equipment in a safe condition.; Shoes worn on court must be appropriate badminton footwear providing adequate lateral support and grip for the cou...
Why people argue about this
People often assume that BWF's equipment safety rules are solely about ensuring players' physical gear is in good condition for play, but they actually misunderstand that these rules extend far beyond sports equipment to encompass athletes' health and performance, including adhering to anti-doping regulations as part of a comprehensive athlete welfare program.
A "fault" is a violation of the Laws of Badminton. When a fault is committed, the rally ends immediately and the non-offending side wins the rally and a point.
— Law 13, Law 13.6.2, Law 9.1.3, Law 9.1.4, Law 9.1.5, Law 9.1.6, Law 9.1.7, Law 9.1.8, Law 13.6.3, Law 9.4, Law 13.4, Law 13.4.1, Law 13.4.2, Law 13.4.3, Law 13.4.4, Law 13.4.5, Law 13.4.6, Law 13.4.7, Law 13.4.8, Law 13.4.10
Why people argue about this
People often argue that a fault is only called when they clearly see an error by their opponent, forgetting that faults can also occur due to hitting the shuttlecock out of bounds or below the net – misunderstandings arise because these gray areas aren't always obvious and can lead to missed calls.
The fundamental objective during play is to keep the shuttlecock in play (a rally) by striking it over the net so that it lands within the opponent's court, or to force the opponent to commit a fault. The shuttle may only be struck once by a playe...
— Law 14.2
Why people argue about this
People often assume that hitting the shuttlecock once is all it takes for a point, forgetting that forcing their opponent into a fault by missing or mishitting also counts as a valid play under the general rules of Badminton. The confusion arises because they overlook how points are awarded based on when and how the opponent commits a fault rather than just counting hits.
BWF Tournament Regulations include guidelines for play in high-temperature or high-humidity environments. If indoor venue temperatures exceed recommended thresholds, the tournament director and medical officer may invoke heat policy provisions, in...
— Law 16.2, Law 16.3
Why people argue about this
People often assume that if it's too hot outside, matches will simply be postponed without considering other potential adjustments like reducing court size or limiting play time per session, which they mistakenly believe is BWF’s only response to heat policy provisions.
A maximum of 90 seconds between games is allowed (Law 16.2).; A maximum of 5 minutes is allowed between the second and third games (Law 16.3), during which players may leave the court. Players may also receive coaching during this interval.; When the leading score reaches 11 points in the third g...
— Law 16.2, Law 16.3, Law 16.4, Law 16.5
Why people argue about this
People often assume that players switch ends every 11 points in all games, which is a common misconception since it only applies when leading score reaches 11 points specifically in the third game of a match. The rule's specificity about the third game can lead to confusion and disputes over when changes should occur.
A "let" is called when a rally is stopped and replayed with no point awarded. A "let" shall be called (Law 13.3) in the following circumstances: The shuttle is caught in the net and remains suspended on the top of the net after passing over the net (except on service).; During service, if the rec...
— Law 13.3, Law 13.3.4, Law 13.3.5, Law 13.3.6, Law 13.3.7, Law 13.3.8, Law 13.1
Why people argue about this
People often think that a let is called when the score gets tied 0-0 in a rally, which isn't accurate according to BWF rules. Actually, a let is triggered by an unclear or ambiguous situation where replaying the rally could change the outcome of the game, like if both players hit the shuttlecock simultaneously off court.
The scoring system is governed by Law 8 of the BWF Laws of Badminton. The following rules apply to all BWF-sanctioned competition: A match shall consist of the best of 3 games (Law 8.2).; The side first scoring 21 points wins a game (Law 8.3).; If the score reaches 20-all, the side which gains a ...
— Law 8, Law 8.1, Law 8.2, Law 8.3, Law 8.3.1, Law 8.3.2, Law 8.4, Law 16.4
Why people argue about this
People often assume that in a BWF badminton match, each game is played until one player reaches 21 points first, but actually, it's 25 points (with a 2-point lead). The confusion arises because of how some players and spectators might misinterpret the rule, thinking games end at 21 instead of 25.
BWF-sanctioned events shall appoint the following officials to administer a match: Conducting the toss.; Calling the score in the prescribed manner.; Deciding faults that occur in the umpire's field of vision (generally the net and above).
— Law 17, Law 18, Law 9.1
Why people argue about this
People often assume that since the referee has overall authority, they make every decision, which leads to misunderstandings about their role in a match. In reality, while the referee oversees everything, decisions like scoring calls and enforcing certain rules are typically made by individual umpires or service judges, leaving room for debate on specific rulings within their jurisdiction.
In addition to rally-point faults, the umpire and referee may impose disciplinary sanctions for player misconduct.
— Law 16.1, Law 16
Why people argue about this
People often assume that only serious offenses like cheating would warrant disciplinary penalties in badminton, forgetting that minor infractions like unsportsmanlike conduct or disrespecting officials can also trigger these sanctions under Law 16 and BWF Code of Conduct, leading to confusion about what exactly constitutes misconduct.
In addition to rally-point faults, the umpire and referee may impose disciplinary sanctions for player misconduct.
Why people argue about this
People often assume that misconduct penalties are only for extremely egregious behavior like foul language or physical altercations, but in badminton, they can be applied even for minor infractions such as arguing a point decision or showing poor sportsmanship during a match, leading to confusion about when and how these sanctions should be used.
The BWF and member associations are responsible for player welfare at sanctioned events. All major BWF events must have qualified medical personnel available courtside or in the venue.
— Law 16.5
Why people argue about this
People often assume that having medical personnel at events is just for emergencies like severe injuries, but they misunderstand that these professionals are also there to provide general health advice and support throughout matches, which can help prevent minor issues from becoming major problems.
Before play commences, a toss shall be conducted. The side winning the toss shall exercise one of the following choices: (a) to serve or to receive first;; (b) to start play at one end or the other.
— Law 4, Law 5, Law 8.4, Law 10, Law 16
Why people argue about this
People often assume that coaches can only be in the stands observing from a distance, which leads them to argue about whether they're allowed to whisper coaching tips to their players during matches. Actually, the BWF Code of Conduct clearly states no outside coaching is permitted at all during play, not just from the sidelines.
Posts shall be 1.55 m (5 ft 1 in) in height from the surface of the court and shall remain vertical when the net is strained.; Posts shall be placed on the doubles side lines, regardless of whether singles or doubles is being played.; The net shall be made of fine natural or artificial cord of da...
— Law 1.6
Why people argue about this
People often assume that badminton courts must be made of wood like a traditional squash court, which leads to misunderstandings about what surfaces are acceptable under BWF regulations. However, the actual rule allows for both wooden and synthetic materials as long as they meet the requirement of being free from obstructions, thus avoiding confusion over specific surface types.
The racket is governed by Law 3 of the BWF Laws of Badminton. The following specifications are mandatory for all BWF-sanctioned competition: The overall length of the racket frame shall not exceed 680 mm (26.77 in).; The overall width of the racket frame shall not exceed 230 mm (9.06 in).; The fr...
— Law 3, Law 3.3, Law 2, Law 2.1, Law 2.2, Law 2.3
Why people argue about this
People often assume that Law 3 of the BWF Laws of Badminton only applies to rackets used in competitions, forgetting that it also covers equipment for training purposes. The confusion arises because they overlook the fact that these rules extend beyond just competition settings to encompass all aspects of badminton play and practice.
The court dimensions are specified in Law 1 of the BWF Laws of Badminton. The court shall be a rectangle marked out with lines 40 mm (1.57 in) wide.
— Law 1, Law 1.6
Why people argue about this
People often assume that the 40 mm lines are just decorative borders around the court, when in fact these lines are crucial for defining the playing area precisely according to BWF standards, ensuring fair play by delineating boundaries strictly as per the rule.
Before play commences, a toss shall be conducted. The side winning the toss shall exercise one of the following choices: (a) to serve or to receive first;; (b) to start play at one end or the other.; Conducting the toss.
— Law 4, Law 5, Law 8.4, Law 10, Law 16, Law 17, Law 18, Law 9.1, Law 16.2, Law 16.3, Law 16.4, Law 16.5
Why people argue about this
People often assume that coaching is only strictly prohibited during official intervals, thinking you can coach anytime else, leading to arguments over when exactly it's allowed or not. The confusion arises because the BWF Code of Conduct specifies no outside coaching at all, except during those officially designated breaks.
The fundamental objective during play is to keep the shuttlecock in play (a rally) by striking it over the net so that it lands within the opponent's court, or to force the opponent to commit a fault. The shuttle may only be struck once by a playe...
— Law 14.2, Law 9, Law 9.1.1, Law 9.1.2, Law 9.1.3, Law 9.1.4, Law 9.1.5, Law 9.1.6, Law 9.1.7, Law 9.1.8, Law 9.2, Law 9.4, Law 9.6, Law 9.7, Law 10, Law 10.1.1, Law 10.1.2, Law 10.1.3, Law 10.1.4, Law 10.1.5
Why people argue about this
People often assume that once a shuttlecock is hit over the net, it's automatically considered in play if it lands on their side of the court, which isn't correct. The official verdict clarifies that for the shot to be valid and kept in play, the opponent must not commit a fault; simply landing within their own court doesn’t ensure the rally continues.
The scoring system is governed by Law 8 of the BWF Laws of Badminton. The following rules apply to all BWF-sanctioned competition: A match shall consist of the best of 3 games (Law 8.2).; The side first scoring 21 points wins a game (Law 8.3).; If the score reaches 20-all, the side which gains a ...
— Law 8, Law 8.1, Law 8.2, Law 8.3, Law 8.3.1, Law 8.3.2, Law 8.4, Law 16.4
Why people argue about this
People often assume that a game ends as soon as one player reaches 21 points in each set, forgetting about the "Advantage" rule which can extend games longer. Actually, players need to reach 30 points before declaring a winner, and if it's tied at 29-29, play continues until one player is ahead by two points. So they keep playing even after reaching 21 points in each set.
A "fault" is a violation of the Laws of Badminton. When a fault is committed, the rally ends immediately and the non-offending side wins the rally and a point.
— Law 13, Law 13.6.2, Law 9.1.3, Law 9.1.4, Law 9.1.5, Law 9.1.6, Law 9.1.7, Law 9.1.8, Law 13.6.3, Law 9.4, Law 13.4, Law 13.4.1, Law 13.4.2, Law 13.4.3, Law 13.4.4, Law 13.4.5, Law 13.4.6, Law 13.4.7, Law 13.4.8, Law 13.4.10
Why people argue about this
People often assume that a fault is only called when they hit the shuttlecock out of bounds, forgetting that faults can also occur from hitting it too softly or making contact with their body parts other than their racquet. The confusion arises because in badminton, a wide variety of infractions are considered faults beyond just out-of-bounds hits.
The BWF and member associations are responsible for player welfare at sanctioned events. All major BWF events must have qualified medical personnel available courtside or in the venue.
— Law 16.5, Law 2.3, Law 16.2, Law 16.3
Why people argue about this
People often assume that having medical personnel at events is solely for treating injuries during matches, but actually, these professionals are there to ensure overall player safety throughout the entire event, from warm-ups to post-event check-ins, addressing all health concerns and emergencies promptly.
Service is the action that initiates a rally. Law 9 governs all aspects of the service action in detail.
— Law 9, Law 9.1.1, Law 9.1.2, Law 9.1.3, Law 9.1.4, Law 9.1.5, Law 9.1.6, Law 9.1.7, Law 9.1.8, Law 9.2, Law 9.4, Law 9.6, Law 9.7, Law 10, Law 10.1.1, Law 10.1.2, Law 10.1.3, Law 10.1.4, Law 10.1.5
Why people argue about this
People often assume that a successful serve in badminton means hitting the shuttlecock over the net without it touching either net post on its way, but actually, they overlook the crucial detail that the server must land the shuttlecock within the designated service court area to be considered valid - this is where the confusion arises.
Under Law 14, the shuttle is not in play once a fault has occurred, or a "let" has been called. In all other circumstances, the shuttle remains in play from the moment it is struck by the server's racket until it touches the court surface or a fault or let is called.
— Law 14, Law 14.2
Why people argue about this
People often assume that once a fault is called, the shuttle automatically goes out of play, forgetting that it stays in play until either a let or another fault occurs. This misunderstanding stems from their initial assumption based on instinct rather than the detailed wording of Law 14.
The racket is governed by Law 3 of the BWF Laws of Badminton. The following specifications are mandatory for all BWF-sanctioned competition: The overall length of the racket frame shall not exceed 680 mm (26.77 in).; The overall width of the racket frame shall not exceed 230 mm (9.06 in).; The fr...
— Law 3, Law 3.3
Why people argue about this
People often assume that Law 3 of Badminton only deals with what constitutes a valid racket, when in reality it covers much more - including how rackets must be constructed, their weight limits, and even requires them to have specific strings! The confusion arises because many overlook the comprehensive nature of this law.
The shuttlecock may be made from natural or synthetic materials. Regardless of the material, the flight characteristics shall, in general, be similar to those produced by a natural feathered shuttlecock with a cork base covered by a thin layer of leather.
— Law 2.1, Law 2.2, Law 2.3
Why people argue about this
People often assume that if a shuttlecock can be made from synthetic materials, it must fly differently than traditional ones, leading to arguments about performance differences. However, the official verdict clarifies that regardless of material, its flight characteristics should remain similar to natural feathered versions, addressing this misconception directly.
Players are entitled to a warm-up period prior to the start of a match. At BWF World Tour events, a standard warm-up of 5 minutes on the match court is provided.
— Law 2.3
Why people argue about this
People often assume that the 5-minute warm-up period is exclusively for them to get their racquets ready, forgetting about warming up their bodies too. But actually, it's meant to ensure players are fully prepared both physically and mentally before a match starts, addressing common misunderstandings about what constitutes proper preparation.
A player/pair wins the match by winning two games. There is no requirement to win by a set margin of games; the first side to win two games wins the match.
Why people argue about this
People often assume that winning by just two games means a huge margin of victory, so they argue about whether it's fair for one side to win decisively with such a small gap. But actually, the key point is that as long as one team reaches two wins before their opponents do, regardless of how close the scores are in between, they've won the match according to this rule.