Field hockey pitch

The hockey pitch is rectangular in shape. The longer perimeter edges are called the side line, the opposing shorter edges are referred to as the back line and the portion of this between the goal posts is known as the goal line. The side line must measure 91.40 m (100 yd) and the back line should measure 55.00 m (60 yd). There must be a minimum run-off of at the sidelines and at the backlines, which may be a different surface for the final metre. All line markings must be white and wide. In each corner of the pitch, a corner flag of no more than square is attached to a post of height . In 1975, the current width of 60 yards was written into the rules. On artificial surfaces, the field of play should be coloured green, ultramarine blue or signal blue. It is permitted for the run-off portion of the pitch to be an alternative colour. The London 2012 Olympics started a new trend for blue hockey pitches because blue turf helps television viewers to clearly see the ball and markings on the hockey pitch during gameplay. Not all hockey pitches have to be blue, but a yellow ball on blue turf is now the standard for professional field hockey tournaments. ==Goal==

. The goal is deeper at ground level with side and backboards around the base. Goals consist of two upright posts placed equidistant from the centre of the backline, joined at the top by a horizontal crossbar. The inner edges of the posts must be apart, and the lower edge of the crossbar must be above the ground. The goalposts and crossbar must be white and rectangular in shape with width and a depth of . The goal must be at least 1.20 m deep at ground level and at least 0.90 m deep at crossbar level. The goal area must be delimited at ground level by a goal backboard and two sideboards of height . Affixed to these boards, the posts and crossbar is a net to stop the ball. Hockey nets can come in different dimensions depending on how deep at ground level and at crossbar level the goal is. Typical dimensions for a standard field hockey net are around 3.7m (W) x 2.1m (H) x 1.2m (D). The first hockey goals were " tall posts placed apart" but were reduced to apart in the 1886 rules. In 1987, a rule was introduced so that at penalty corners "the first hit at goal should not cross the goal-line higher than ". This saw the introduction of a sideboard and backboard to the goals which are now mandatory. ==Circle==

A goal is scored when the ball passes completely over the goal line but only if the ball was played by an offensive player in the penalty circle. Additionally, the circle marks the area a goalkeeper may play the ball with any part of their body and the area where an infringement by a defender results in a penalty corner. The terminology circle (or D) is widely used although the area is actually formed by a straight line, parallel to the goal line, connected to two quadrant arcs. The 1876 rules stated that "no goals shall be allowed if the ball be hit from a distance of more than from the nearest goalpost". A visible "striking circle" with "radius of 15 yards" was codified in 1886. The radius of the circle was increased to in 1951 for men's hockey and 1968 for women's hockey. Any free-hit within 5 m of the circle has slightly different rules from others concerning other players’ distance; a broken circle 5 m from the penalty circle denotes this location. A penalty spot is centrally positioned directly in front of the goal and used for a penalty stroke. The spot is 150 mm in diameter and its centre is 6.475 m from the outside of the goal line. Penalty strokes were introduced in 1963 for deliberately stopping a certain goal; they were originally taken from goal. In 1973, a stroke could also be awarded for a deliberate foul in the circle and the spot was moved to from goal the following year. ==Other markings==

prepares to take a penalty corner from the 10 m mark. The 5 m line above demarcates the closest position a defender may stand. A half-way line, parallel to the back line, divides the pitch in two. The start of each period of play and resumption of play following a goal starts with all players in the half they are defending. The line was also used for the obsolete offside rule. Each half of the pitch is then divided again by a line, referred to as the 23 metre line or 25 yard line, positioned 22.90 m from each back line. Historically, this was first used to resume play after the ball passed over the back line and marked by flags at the side of the pitch. In 1949, deliberate defensive offenses in this area resulted in a penalty corner. From 1961, players on the defensive team who were not involved at the penalty corner stood behind this line (this was then moved to the half-way line two years later). The line was also used for the offside rule between 1987 until the rule was abolished in 1996. Nowadays, there are detailed rules regarding fouls and free-hits in the 23 metre region of the pitch. Since 2015, the 23 metre line has also been used for the attacking team to resume play when it has gone over the back line (this replaced long corners). There are additional markings 300 mm long and perpendicular to the back line that denote distances of 10 m and 5 m from each goal post. These are relevant at a penalty corner; the former is the mark from which the attacking team takes the penalty corner and the latter is the closest position which a defender may stand. These marks had been in earlier versions of the rules. There is a similar mark 5 m from along the side line (from where long corners were formerly taken) and a mark 14.6 m along the side line indicating the level of the top of the penalty circle. There are also 150 mm long markings where the goal posts are situated. ==Artificial playing surface==

{{blockquote| Artificial grass permits easier ball control and this in itself helps to reduce the number of infringements of the rules—which means less whistle and fewer stoppages. The game thus becomes easier to follow, as well as being a faster spectacle and much more interesting from a spectator point of view. Historically, the game was developed on natural grass turf. However, in 1976, the International Hockey Federation (FIH) made artificial pitches mandatory at all major competitions. The 1976 Summer Olympics in Montreal was the first of these; however at this time few players had seen or played on synthetic pitches. Although it is still permissible to play on natural turf, all national competitions and international matches must be played on an artificial surface. Elite-level competitions, such as the Olympic Games and World Cup, require a water-based playing surface. However, due to water conservation efforts, this is not seen as a long-term sustainable option and alternative elite surfaces that do not require water are being researched. There are three main types of artificial hockey surface: • Unfilled or water-based – artificial fibres that are densely packed for stabilisation, requires irrigation or watering to avoid pitch wear • Dressed or sand-dressed – artificial fibres can be less densely packed and sand supports the fibres for part of the pile depth • Filled or sand-filled – artificial fibres can be longer and less densely packed and sand supports the fibres for 100% of the pile depth On water-based pitches, shorter fibres and wetted turf reduce friction and increase the speed at which the game can be played. However, these pitches require watering before, during and after the game and maintenance costs are significant. Sand-dressed pitches cost more than sand-filled pitches but are preferable for hockey as there is an absence of sand close to the playing surface. However, a multi-purpose surface suitable for sports including association football and tennis is often required and hockey may not be the predominant sport. There are many different specifications and categorisations for artificial turf including shock absorption, surface rebound, friction, and strength outlined by the International Hockey Federation. Recently, longer-pile third-generation or 3G pitches have become popular, especially for football, but these do not usually meet the FIH's test criteria; they are often too inconsistent and slow. Criticism World Hockey magazine reported on the first hockey tournament played on an artificial pitch in 1975—a trial event in Montreal prior to the Olympics—and said the surface had "enormous benefits". Before the switch to an artificial surface the Indian men's hockey team were dominant, winning seven of the eight Olympic gold medals between 1928 and 1964. In 1996, Indian hockey player Ajit Pal Singh stated that despite its size "[India] can afford only 12 or so AstroTurf fields". When describing the change of surface, Ruskin said that "for India it was like starting over, with all nations even in field hockey." ==References==