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| Obstruction |
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Field hockey players may not use their sticks or bodies to prevent other players from hitting the ball. Doing so is obstruction. It's also obstruction if the goalkeeper lies on the ball. See also third-party obstruction.
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| Overtime |
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If a game ends in a tie, teams may play a sudden-death, ten-minute overtime period, with the victory going to the first team that scores a goal.
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