Professor Truebridge waited quietly for the Slytherin and Gryffindor players to step up to the Gobstones court. He had the red bag and the green one, with the matching gobstones hanging from his fingertips and he held them out and waited until a student from each house took them. As soon as they did he set up the rest of the stones and turned to the players. “Preliminary round… and all that… read the rules before you play or pay the price… and such. Ahem. Let’s begin then.”