A standard game will have 2 umpires, one on each side of the field and controlling a circle each. A reserve umpire may also wait on the sideline, in case one of the otehrs is injured. Summer hockey also often uses one umpire only, as it is commonly played on a half field with smaller teams.
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During game play the are four (4) officials on the ice: Two (2) referees and two (2) linesman.
For complete listing of the exact number of officials (referees & linsemen) and their names please visit: www.NHLofficials.com.