the red vest could take no further part in the game. Teams were limited to a single substitution per game. Players were substituted for tactical reasons or to replace an injured player. At the start of the 2016 season the substitute rule was removed, returning to four available interchange players. The substitute returned in the 2021 season, but was only available to replace an injured player. Utility players There are very few players in the AFL league who possess the skill and poise to be able to consistently perform to a very high standard in many different positions. Some of these players do not receive the recognition they deserve, while others, such as Matthew Pavlich, Jimmy Bartel, and Adam Goodes, are praised for their versatility and ability to influence a game from any position. Traditionally, a utility player is an unheralded but nonetheless important player. He does not dominate one position, instead he is like a "spare parts" player because he can fill in at a variety of positions and do a good job in each. Nowadays, the need for more versatility in players has resulted in many players "doubling up" their roles. Practically every midfielder can play Forward Pocket, Back Pocket, Half-Forward Flank or Half-Back Flank. Most, if not all, starting ruckmen can play as tall forwards, or in rarer cases, tall defenders. Some tall defenders can play as tall forwards and vice versa. This means that most AFL players have a specialist position and one or two "fill-in" positions. One exception to this would be a player who is actually a specialist at two positions, not just a fill-in (i.e. Adam Hunter, the Eagles' best Centre-Half Back, is also one of their most dominant Full Forwards). Another exception would be midfielders, such as James Hird and Anthony Koutoufides, who have the height and strength to play key positions. This requires an extremely rare blend of skills and abilities. Below are a number of players who are notable for their ability to dominate various positions. Notable players: Adam Goodes: Centre Half-Back, Ruck Centre, Half-Forward Bernie Quinlan: Ruck-rover, Centre Half-Forward, Full-Forward Malcolm Blight: Ruck-rover, Wing, Half-Forward Flanker, Full-Forward Barrie Robran: Centre, Ruck-rover, Centre Half-Back, Centre Half-Forward, Full-Forward Alex Jesaulenko: Centre, Ruck-rover, Half-Back Flank, Half-Forward Flanker, Full-Forward Gary Ablett: Wing, Half-Forward Flanker, Half-Back Flank, Forward Pocket, Full-Forward Peter Knights: Centre Half-Back, Half-Back Flank, Centre Half-Forward, Half-Forward Flanker, Full-Forward Phil Carman: Centre,