A typical game of hockey is governed by two to four "officials" on the ice, charged with enforcing the rules of the game. There are typically two "linesmen" who are mainly responsible for calling "offside" and "icing" violations, breaking up fights, and conducting faceoffs, and one or two "referees", who call goals and all other penalties. Linesmen can, however, report to the referee(s) that a penalty should be assessed against an offending player in some situations. The restrictions on this practice vary depending on the governing rules. On-ice officials are assisted by off-ice officials who act as goal judges, time keepers, and official scorers.