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handicap systems are not used in professional golf. Professional golfers often score several strokes below par for a round and thus have a calculated handicap of 0 or less, meaning that their handicap results in the addition of strokes to their round score. Someone with a handicap of zero or less is often referred to as a 'scratch golfer.'Rules and other regulationsThe rules of golf are internationally standardised and are jointly governed by the Royal and Ancient Golf Club of St Andrews (R&A), which was founded 1754 and the United States Golf Association (USGA). By agreement with the R&A, USGA jurisdiction on the enforcement and interpretation of the rules is limited to the United States and Mexico. The national golf associations of other countries use the rules laid down by the R&A and there is a formal procedure for referring any points of doubt to the R&A.The underlying principle of the rules is fairness. As stated on the back cover of the official rule book: "play the ball as it lies", "play the course as you find it", and "if you can't do either, do what is fair". Some rules state that:every player is entitled and obliged to play the ball from the position where it has come to rest after a stroke, unless a rule allows or demands otherwise (Rule 13-1)ain article: Golf handicapA handicap is a numerical measure of an amateur golfer's ability to play golf over 18 holes. Handicaps can be applied either for stroke play competition or match play competition. In either competition, a handicap generally represents the number of strokes above par that a player will achieve on an above average day.In stroke play competition, the competitor's handicap is subtracted from their total "gross" score at the end of the round, to calculate a "net" score against which standings are calculated. In match play competition, handicap strokes are assigned on a hole-by-hole basis, according to the handicap rating of each hole (which is provided by the course). The hardest holes on the course receive the first handicap strokes, with the easiest holes receiving the last handicap strokes.Calculating handicaps are often complicated, but essentially are representative of the average over par of a number of a player's previous above average rounds, adjusted for courseHandicap systems are not used in professional golf. Professional golfers often score several strokes below par for a round and thus have a calculated handicap of 0 or less, meaning that their handicap results in the addition of strokes to their round score. Someone with a handicap of zero or less is often referred to as a 'scratch golfer.'Rules and other regulationsThe rules of golf are internationally standardised and are jointly governed by the Royal and Ancient Golf Club of St Andrews (R&A), which was founded 1754 and the United States Golf Association (USGA). By agreement with the R&A, USGA jurisdiction on the enforcement and interpretation of the rules is limited to the United States and Mexico. The national golf associations of other countries use the rules laid down by the R&A and there is a formal procedure for referring any points of doubt to the R&A.The underlying principle of the rules is fairness. As stated on the back cover of the official rule book: "play the ball as it lies", "play the course as you find it", and "if you can't do either, do what is fair". Some rules state that:every player is entitled and obliged to play the ball from the position where it has come to rest after a stroke, unless a rule allows or demands otherwise (Rule 13-1)a player must not accept assistance in making a stroke (Rule 14-2)the condition of the ground or other parts of the course may not be altered to gain an advantage, except in some cases defined in the rulesa ball may only be replaced by another during play of a hole if it is destroyed (Rule 5-3), lost (Rule 27-1), or unplayable (Rule 28), or at some other time permitted by the Rules. The player may always substitute balls between the play of two holes. The Decisions on the Rules of Golf are based on formal case decisions by the R&A and USGA and are revised and updated every other year.There are strict regulations regarding the amateur status of golfers. Essentially, everybody who has ever received payment or compensation for giving instruction or played golf for money is not considered an amateur and may not participate in competitions limited solely to amateurs. However amateur golfers may receive expenses which comply with strict guidelines and they may accept non-cash prizes within the limits established by the Rules of Amateur Status.In addition to the officially printed rules, golfers also abide by a set of guidelines called Golf etiquette. Etiquette guidelines cover matters such as safety, fairness, easiness and pace of play, and a player's obligation to contribute to the care of the course. Though there are no penalties for breach of etiquette rules, players generally follow the rules of golf etiquette in an effort to improve everyone's playing experience.] Variations and similar gamesMain article: Variations of golfVariations of golf are games or activities based on or similar to the game of golf, in which the player utilizes common golf skills. Some are essentially identical to golf, with only minor rules changes, while others are more distant and arguably not simple variations but distinct games. Examples include Skins and Bingo Bango Bongo.Hitting a golf ballTo hit the ball, the club is swung at the motionless ball wherever it has come to rest from a side stance. Many golf shots make the ball travel through the air (carry) and roll out for some more distance (roll).Every shot is a compromise between length and precision, and long shots are often less precise than short ones. A longer shot may result in a better score if it helps reduce the total number of strokes for a given hole, but the benefit may be more than outweighed by additional strokes or penalties if a ball is lost, out of bounds, or comes to rest on difficult ground. Therefore, a skilled golfer must assess the quality of his or her shots in a particular situation in order to judge whether the possible benefits of aggressive play are worth the risks.Types of shotsStrictly speaking, every shot made in a round of golf will be subtly different, because the conditions of the ball's lie and desired travel path and distance of the ball will virtually never be exactly the same. However, most shots fall into one of the following categories depending on the purpose and desired distance: