Person who is the sole judge of fair and unfair play, is who makes a decision in the interests of fair play for any situation not covered adequately by Rule; is responsible for the proper conduct of the game under these Rules; intervenes if he sees any infringement of these Rules; tells a player the colour of a ball if requested, and cleans any ball upon reasonable request by a player. The referee does not answer any question not authorised in these Rules, gives any indication that a player is about to make a foul stroke; gives any advice or opinion on points affecting play; nor answers any question regarding the difference in scores. If the referee has failed to notice any incident, he may take the evidence of the marker or other officials or spectators best placed for the observation to assist his decision.