Curling is a precision team sport similar to bowls or bocce, played on a rectangular sheet of prepared ice by two teams of four players each, using heavy polished granite stones which they slide down the ice towards a target area called the house. Points are scored for the number of stones that a team has closer to the center of the target than the closest of the other team's stones. The level of precision and complex nature of the strategic thinking required to win has led curling to be referred to as "chess on ice."
The word curling first appears in print in 1620 in Perth, Scotland, in the preface and the verses of a poem by Henry Adamson. The game was (and still is, in Scotland) also known as "the roaring game" because of the sound the stones make while travelling over the pebble (droplets of water applied to the playing surface). The word derives from the Scots language verb curr * which describes a low rumble (a cognate of the English language verb purr). The word does not take its name from the motion of the stones, which due to their deviation from a straight-line trajectory are said to curl.
In the early history of curling, the rocks were simply flat-bottomed river stones which were sometimes notched or shaped; the thrower had little control over the rock, and relied more on luck than skill to win, unlike today's reliance on skill and strategy.
Outdoor curling was very popular in Scotland between the 16th and the 19th centuries as the climate provided good ice conditions every winter.
Scotland is home to the international governing body for curling, the World Curling Federation, Perth, which originated as a committee of the Royal Caledonian Curling Club, the mother club of curling.
Today the game is most firmly established in Canada, having been taken there by Scottish emigrants. The Royal Montreal Curling Club, the oldest active athletic club of any kind in North America, was established in 1807. The first curling club in the United States began in 1832, and the game was introduced to Switzerland and Sweden before the end of the nineteenth century, also by Scots. Today, curling is played all over Europe and has spread to Japan, Australia, New Zealand, and even China and Korea.
The first world curling championship in the sport was limited to men and was known as the "Scotch Cup" held in Falkirk and Edinburgh, Scotland, in 1959. The first ever world title was won by the Canadian team from Regina, Saskatchewan, skipped by Ernie Richardson. (The skip is the team captain, see below.)
Curling has been an official sport in the Winter Olympics since the 1998 Winter Olympic Games. In February 2006, the International Olympic Committee retroactively decided that the curling competition from the 1924 Winter Olympic Games (originally called Semaine des Sports d'Hiver or International Winter Sports Week) would be considered official Olympic events and no longer be considered demonstration events. Thus, the first Olympic medals in curling, which at the time was played outside, were awarded for the 1924 Winter Games with the gold medal won by Great Britain and Ireland, two silver medals by Sweden and the bronze by France.
During each round of play, called an end, each player slides two stones along the surface of the ice. Play alternates between teams, each throwing one stone on their turn. The person throwing the stone influences where the stone stops by the amount of force used, called the weight, the spin (turn), and the direction of the throw. Additionally, the final position of the stone is changed by sweeping or brushing the path in front of the stone to reduce curl and increase distance. Once all the stones have been thrown during an end, the score is determined and the play reverses direction back to the other house.
The players are known as the lead, second, third and skip, and traditionally throw stones in that order . The skip acts as the team’s captain, determining the position played by each player, strategy during the game, holding the broom in the house as a target for the shooters, and representing the rink. However, there is nothing in the rules to say where in the order the skip plays and in recent years the skip has thrown second or third stones on some teams.
The basic goal of each end is to have your curling stones nearer to the center of the target once all the stones from both teams have been thrown for that end. Therefore, the maximum number of points a team can earn per end is eight, though this is extremely rare because only the closest stones belonging to one of the two teams are counted. Strategies used during play, such as blocking (guard) and hitting rocks to reposition them (bump) or remove them from play (take-out) lead to lower scores. The term draw is used to describe a shot that comes to rest in the house without making contact with another stone. To peel means to remove both the target stone and the shooter's stone from play. For more information, see Types of shots below.
To help ensure the stone lands where intended, the skip stands in the house and indicates to the player throwing where to aim given the desired effect of the shot. The other two players sweep in front of the rock. Once thrown, players may not touch a stone while it is moving, so sweeping is the only way to influence the stone once thrown. Games, called matches, usually last eight ends, though in competitive curling there are usually ten ends and some recreational games last six ends.
The curling arena is a sheet of ice 146 feet (45.5 m) in length by 14 feet 2 inches (4.318 m) to 15 feet 7 inches (4.75 m) in width, carefully prepared to be absolutely level so as to allow the rocks to glide with as little friction as possible. A key part of the preparation is the spraying of fine water droplets onto the ice, called pebble. Due to the friction between the stone and pebble, the stone turns to the inside or outside, causing the stone's path to 'curl'. The curl changes during a game as the pebble wears out.
Occasionally, small ice crystals, "ice picks", will bond on the bottom of the stone (called the "running surface"), which increase friction and change the stone's path. As the pebble wears down, more ice picks develop, especially if the water is not treated to remove excess minerals.
On the sheet, a 12 foot (3.7 m) wide set of concentric rings, called the house, is painted near each end of the rink. The centre of the house is marked by the junction of two lines that divide the house into quarters and is known as the button. The two lines are the centre line, which is drawn lengthwise down the centre of the sheet, and the tee line, drawn 16 feet (4.9 m) from the backboard and parallel to it. Two other lines, the hoglines, are drawn parallel to each backboard and 37 feet (11.3 m) from it.
The rings that surround the button are defined by their diameter as the four-foot, eight-foot, and twelve-foot rings. They are usually distinguished by colour. The inner rings are merely a visual aid for judging which stone is closer to the centre; they do not affect scoring; however, a stone that is not at least touching the outside of the 12-foot ring (i.e. more than 6 feet from the centre) is not in the house and therefore does not score (see below).
Twelve feet behind the button (therefore 4 feet from the backboard), the centre line is crossed at right angles by the hack line. The hack is a device used to provide traction to the curler making a shot; the curler places the foot he or she will push off with in the hack. On indoor rinks there are usually two fixed hacks, rubber-lined holes, one each side of the centre line with the inside edge no more than three inches (7.6 cm) from the centre line and the front edge on the hack line. A single moveable hack may also be used.
Depending on the tradition, the lead may flip a coin with the opposing lead to determine who will have last rock advantage at the beginning of a game. The winner of the toss has the option to pick either last rock, or the colour of the rocks they wish to play with. In major tournaments, these decisions are usually made beforehand.
After each round of play (or "end"), the thirds for both teams must reach an agreement about which team scored and how many points. If there is a disagreement, or uncertainty, the thirds may measure the rocks to see which ones are closer. At this time, only the thirds are allowed in the house. In major tournaments, the scorekeeping is left to an official. Depending on the tradition, when the third's team scores, the third will record it on the score-board.
The skip rarely does any sweeping, except in the house and behind the tee line. The skip is required to stay out of the playing area when it is the other team's turn, but he is allowed to sweep stones in motion behind the tee line as a result of their shot. (In International rules, the skip, when he or she is not throwing, is the only player allowed to sweep their opponent's stones behind the tee-line.)
In earlier days, brooms were made of corn strands and were similar to household brooms. Brushes were used primarily by elderly curlers as a substitute for corn brooms. Today, brushes have replaced traditional corn brooms at every level of curling, but are universally referred to as brooms. Brooms are also used by some curlers as a balancing aid during delivery of the stone.
The curling stone, or rock, weighs a maximum of 44 lbs. (19.96 kg) and is fitted with a handle on top allowing it to be rotated as it is released. If the handle is rotated across the body (clockwise for a right-handed thrower, counter-clockwise for a leftie), the shot is said to be an in-turn, and if rotated away from the body (counter-clockwise for a right-handed thrower, clockwise for a leftie), it is an out-turn. The handles are colour-coded to differentiate one team's rocks from the other's (usually, one team's rocks are red and the other's are yellow). The handle may also contain circuitry for detecting hog line violations. *
The bottom of the rock is not flat, however, but concave with the actual surface in contact with the ice ("running surface") being only ¼ to ½ inch (6 to 12 mm) wide along the rim of the concave bottom. This narrow running surface allows the pebble applied to the ice to have an effect on the action of the rock. On properly prepared ice, the rock's path will bend (curl) in the direction the front edge of the rock is turning, especially toward the end of its delivery. The degree of curl depends on several factors, including the preparation of the ice and the flattening of common paths to the house during the game. Ice on which the rocks curl well is said to be swingy.
The Scots in particular believe that the best quality curling stones are made from a specific type of granite called "Ailsite", found on the Ailsa Craig, an island off the Ayrshire coast. According to the Scottish Curling Stone Company, Ailsite has very low water absorption which prevents the action of freezing and melting water from eroding the stone. * In the past, most curling stones were made from this granite. However, the island is now a wildlife reserve, and is no longer used for quarrying. Because of the particular rarity of Ailsite, costs for curling stones can reach as much as $1500 (USD) for Olympic grade stones. Many curling clubs use a lower grade stone that can be upwards of $500. There are also stones which use a disc of ailsite attached to another type of granite to provide the running surface. Very informal neighbourhood curling clubs with limited resources may make cylindrical "curling stones" out of concrete-filled cans.
The curling stones used at the 2006 Winter Olympics in Torino were provided by the Garn For granite quarry at the Yr Eifl mountain on the Llŷn Peninsula in North-West Wales.
Although the rock is designed to be delivered by players grasping the handle as they slide down the ice, a special "delivery stick" may be used by players incapable of delivering the rock in this fashion. Such a stick is designed to attach to the handle so that it can be released without requiring the player to place a hand on the handle in a crouched position. This allows the game to be played by players with disabilities, as well as those unable to crouch comfortably. According to the Canadian Curling Association Rules of Curling, "The use of a curling aid commonly referred to as a 'delivery stick' which enables the player to deliver a stone without placing a hand on the handle is considered acceptable."
It is not uncommon at any level for a losing team to terminate the match before all ends are completed if it believes it no longer has a realistic chance of winning. Most competitive tournaments require eight ends to be completed before allowing a losing team to concede in this manner. Competitive games will usually end once the losing team is "run out of rocks" - that is, once it has fewer stones in play and/or available for play than the number of points needed to tie the game in the final end.
In international competition each side is given 73 minutes to complete all of their throws. Each team is also allowed two 60 second timeouts per ten end game. If extra ends are required each team is allowed 10 minutes of playing time to complete their throws and one added 60 second timeout for each extra end.
While the first three players throw their rocks, the skip remains at the far end of the ice to guide the players. While the skip is throwing, the third takes this role. Thus, each time a rock is thrown, there is one player throwing the rock, and another player at the far end.
The two remaining players, equipped with brooms, follow the rock and assist in guiding its trajectory by sweeping the ice before the rock. Sweeping causes the rock to decrease its curl but travel a greater distance. The sweeping players combine directions from the skip and/or the thrower with their own judgement for the weight of the rock, as well as extremely precise timing, to guide the rock into the appropriate position. Often when giving instructions, the thrower or skip will yell "HARD." They are referring to the amount of pressure the sweepers should use to sweep the ice. Teams confer between throws to determine where they will attempt to place the next rock.
When delivering the rock, it is important to remember that the momentum behind how much weight is applied to the rock depends on how much leg drive the delivery has. It is usually not wise to push the rock with the arm, unless absolutely necessary. When in the hack, one must crouch down with the body lined up and shoulders square with the skip's broom at the other end. While in the hack, one may hold a broom out for balance. Different curlers hold their broom out in many different fashions. The broom is held in the hand opposite from the rock, and should be positioned so that the non-sweeping side of the broom is against the ice. This prevents drag which would be caused by the soft head of the broom dragging against the ice.
Before any delivery is done, it is important to ensure that the running surface of the rock is clean, and that the area around you is clean as well. This is achieved by wiping the running surface of the rock with either your hand or with the broom, and then cleaning the area around you with the broom. The reason for this is that any dirt in the area or on the bottom of a rock could alter the trajectory of it and ruin the shot. When this happens, this is called a "pick".
After cleaning the rock, the next step is to know what rotation, or turn, to put on the rock. The skip will usually tell the thrower this information. The thrower will then place the handle of the rock generally at either a "two o'clock" or a "ten o'clock" position. When delivering the rock, the thrower will turn the rock from one of these two positions toward the "twelve o'clock" position before releasing it. A rock turned from ten o'clock to twelve will spin clockwise and curl to the right, and a rock turned from two o'clock to twelve will have the opposite effect. A generally desired rate of turn is about two and a half rotations before coming to a rest.
Once the thrower knows the turn to give the rock, the thrower will place the rock in front of his or her toe in the hack. At this point the thrower will then start his or her delivery. This begins by slightly rising from the hack, and moving the rock back to one's toe. This is the beginning of a pendulum movement that will determine the force given to the rock. Some older curlers will actually raise the rock in this backward movement, as this is what they are accustomed to. The forward thrust of the delivery comes next. The thrower moves his or her slider-foot in front of the other foot while keeping the rock ahead of him. The thrower then lunges out from the hack. The more thrust from this lunge, the more power or "weight" the rock will have. When lunging out, the gripper-foot will drag behind the thrower. When lunging out, it is important to push as precisely as possible in the direction of the skip's broom at the other end, so that the "line" of the rock is accurate. The rock should be released before the thrower's momentum wanes at which point the thrower imparts the appropriate curl, keeping in mind the stone should be released before the first hog-line.
The amount of weight given to the rock will also be told to the thrower by the skip at the other end. This usually occurs by the skip tapping the ice with his broom where he or she wants the rock to be delivered. In the case of a take-out or a tap, the skip will tap the rock that he or she wants removed or tapped.
It should also be noted that with a more skilled skip, where he wants the rock to land will not always be the exact place he holds the broom if the skip expects the rock to curl. When the rock is delivered accurately at the broom, it will curl towards where the skip wants it to land.
One of the interesting strategy aspects of curling is knowing when to sweep. When swept, a rock will always travel both farther and straighter. In some situations, one of the two is often not desirable (for example, a rock may have too much weight, but needs sweeping to prevent curling into a guard), and the team must decide which is better: getting by the guard but traveling too far, or hitting the guard.
Much of the yelling that goes on during a curling game is the skip calling the line of the shot. The skip evaluates the path of the rock and calls to the sweepers to sweep as necessary to hold the rock straight. The sweepers themselves are responsible for judging the weight of the rock and ensuring the length of travel is correct.
Usually, the two sweepers will be on opposite sides of the rock's path. Grip of the broom is vital - one hand grips the top (non-brush end) of the handle while the other grips the handle close to the head of the broom so that as much pressure as needed may be applied while sweeping, though the precise amount of pressure may vary from relatively light brushing to maximum-pressure scrubbing. It is important to never to touch the rock while sweeping (a rock touched by a sweeper is burned, and the opposing skip may opt to have the rock removed from play).
Sweeping can be done anywhere on the ice up to the "tee-line", as long as it is only for your own team's rock. Once your team's rock crosses the tee-line, only one player may sweep it. Additionally, when an opposing rock crosses the tee-line, one player from your team is allowed to sweep it. This is the only case that a rock may be swept by an opposing team member. In international rules, this player must be the skip, or if the skip is throwing, then the third.
This rule, a relatively recent addition to curling, was added in response to a strategy of "peeling" opponents' guard stones (knocking them out of play at an angle that caused the shooter's stone to also roll out of play, leaving no stones on the ice). A team in the lead would often employ this strategy during the game. By knocking all stones out, the opponents could at best score one point (if they had the hammer). Alternatively, the team with the hammer could peel rock after rock, which would blank the end, keeping the last rock advantage for another end. While a sound strategy, this made for an unexciting game.
The score is marked on a scoreboard, of which there are two types. One is the baseball type scoreboard, which is usually used for televised games. On this scoreboard the ends are marked by columns 1 through 10 (or 11 for the possibility of an extra end to break ties) plus an additional column for the total. Below this are two rows — one for each team. The number of points each team gets in an end is marked this way.
The other form of scoreboard is the one used in most curling clubs (see photo). It is set up in the same way, except the numbered row indicates points, not ends, and it can be found between the rows for the team. The numbers placed are indicative of the end. If the red team scores 3 points in the first end (called a three-ender), then a one (indicating the first end) is placed beside the number three in the red row. If they score two more in the second end, then a two will be placed beside the five in the red row indicating that the red team has five points in total (3+2). This scoreboard works because only one team can get points in an end. However, some confusion can exist if no team gets points in an end. This is called a blank end and the end number usually goes in the furthest column on the right in the row of the team who has the hammer (last rock advantage), or on a special spot for blank ends.
Curling is played in many countries including the United States, United Kingdom (especially Scotland), Norway, Sweden, Switzerland, Denmark, Finland and Japan, all of which compete in the world championships.
Curling is particularly popular in Canada. Improvements in ice making and changes in the rules to increase scoring and promote complex strategy have increased the already high popularity of the sport in Canada, and large television audiences watch annual curling telecasts, especially the Scott Tournament of Hearts (the national championship for women), the Brier (the national championship for men), and the women's and men's world championships.
Despite the Canadian province of Manitoba's small population, teams from that province have won the Brier more times than teams from any other province. The Tournament of Hearts and the Brier are contested by provincial and territorial champions, and the world championships by national champions.
Curling is the provincial sport of Saskatchewan, home of some of the most famous curlers. Ernie Richardson and his family team dominated Canadian and international curling during the late 1950's and early 1960's and are generally conceded to be the best male curlers of all time. CBC Television, Kings of the World: The Curling Richardsons (March 13, 2004). The late Sandra Schmirler led her team to the first ever gold medal in women's curling in the 1998 Winter Olympics. When she died two years later from cancer, over 15,000 attended her funeral.
The sport was depicted in the Canadian comedy film Men With Brooms, in 2002, the only known film based on curling to date.
Additionally, the weight (speed) of an individual rock can also be measured in seconds. This time is the time the rock takes to cross first one hogline and then the other. If this number is lower, the rock is moving faster, so again low numbers mean more speed. The ice in a match will be somewhat consistent and thus this measure of speed can also be used to measure how far down the ice the rock will travel. Once it is determined that a rock taking (for example) 9 seconds to go from hogline to hogline will stop on the button, the curler can know that if they can match that time with later stones, they can throw stones that will stop near the button.
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