The centre (or center in the United States) in ice hockey is a forward position of a player whose primary zone of play is the middle of the ice, away from the side boards. Centres have more flexibility in their positioning and are expected to cover more ice surface than any other player. Centres are ideally stronger, faster skaters who can back check quickly from deep in the opposing zone. Generally, centres are expected to be gifted passers more so than goal scorers, although there are exceptions. They are also expected to have exceptional "ice vision", intelligence, and creativity. They also generally are the most defensively oriented forwards on the ice. Centres usually play as part of a line of players that are substituted frequently to keep fresh and keep the game moving. First-liners are usually the top players, although some top players make the second line to allow for offensive scoring opportunities.