Chaser Arven aims left, Keeper Warrington goes right, Arven scores- ten points for Gryffindor!
Then, if the direction is changed the player in question can complain.
Or, what about if Keeper and Chaser PM the appropriate person- and then that person forwards the messages to the Chaser and Keeper respectively. Then they can react to their score or miss before carrying on with the game, and if the reactions don't match then something has gone distinctly wrong.
Or we could just ask someone who is active but not involved with this particular RPG to be Ref for the match.
But they're just ideas because it would be a shame not to have a scoring system- and I'm rambling a bit since I have no lessons until after lunch... I'm bored.
![:D](./images/smilies/icon_biggrin.gif)