4-3-3 4-3-3 FormationThe 4-3-3 was a development of the 4-2-4, and was played by the Brazilian national team in the 1962 World Cup. Quite simply, it is a more attacking 4-3-2-1. The extra player in midfield allows a stronger defence, and the midfield could be staggered for different effects. The three midfielders normally play closely together to protect the defence, and move laterally across the field as a coordinated unit. The three forwards split across the field to spread the attack, and may be expected to mark the opposition full-backs as opposed to doubling back to assist their own full-backs, as do the wide midfielders in a 4-4-2. When used from the start of a game, this formation is widely regarded as encouraging expansive play, and should not be confused with the practice of modifying a 4-4-2 by bringing on an extra forward to replace a midfield player when behind in the latter stages of a game.A staggered 4-3-3 involving a defensive midfielder (usually numbered 4 or 6) and two attacking midfielders (numbered 8 and 10) was commonplace in Italy, Argentina and Uruguay during the 1960s and 1970s. The Italian variety of 4-3-3 was simply a modification of WM, by converting one of the two wing-halves to a libero (sweeper), whereas the Argentine and Uruguayan formations were derived from 2-3-5 and retained the notional attacking centre-half. The national team which made this famous was the Dutch team of the 1974 and 1978 World Cups, even though the team won neither.In club football, the team that brought this formation to the forefront was the famous Ajax Amsterdam team of the early 1970s, which won three European Cups with Johan Cruyff. Most teams using this formation now use the specialist defensive midfielder; Chelsea F.C. and F.C. Barcelona are the most famous recent examples.[7]At the 2006 FIFA World Cup Spain and The Netherlands played both a variation of 4-3-3 without wingers. The three strikers would interchange positions and run the channels like a regular striker would.Each team consists of a maximum of eleven players (excluding substitutes), one of whom must be the goalkeeper. Competition rules may state a minimum number of players required to constitute a team; this is usually seven. Goalkeepers are the only players allowed to play the ball with their hands or arms, provided they do so within the penalty area in front of their own goal. Though there are a variety of positions in which the outfield (non-goalkeeper) players are strategically placed by a coach, these positions are not defined or required by the Laws.[8]The basic equipment or kit players are required to wear includes a shirt, shorts, socks, footwear and adequate shin guards. Headgear is not a required piece of basic equipment, but players today may choose to wear it to protect themselves from head injury. Players are forbidden to wear or use anything that is dangerous to themselves or another player, such as jewellery or watches. The goalkeeper must wear clothing that is easily distinguishable from that worn by the other players and the match officials.[25]A number of players may be replaced by substitutes during the course of the game. The maximum number of substitutions permitted in most competitive international and domestic league games is three, though the permitted number may vary in other competitions or in friendly matches. Common reasons for a substitution include injury, tiredness, ineffectiveness, a tactical switch, or timewasting at the end of a finely poised game. In standard adult matches, a player who has been substituted may not take further part in a match.[26]A game is officiated by a referee, who has "full authority to enforce the Laws of the Game in connection with the match to which he has been appointed" (Law 5), and whose decisions are final. The referee is assisted by two assistant referees. In many high-level games there is also a fourth official who assists the referee and may replace another official should the need arise.[27]