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 sideboards. Centres have more flexibility in their positioning and are expected to cover more ice surface than any other player.
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Mari had 10,000 and Akkad 36,000 (Modelski, 6) while in 2300 BCE Uruk had a population of 50,000