So, yeah — being a ref in this case did not involve the kind of ref action you'd see in boxing or other physical sports. The players were well-behaved (no cheating that I saw, no pausing, etc.). But it's a real tournament, and the players are serious. They're also using thrift store equipment that could die at any time, so I was keeping track of scores in realtime in case we lost a console, TV, etc. and I had to call whoever was ahead. Keeping track of the two scores is actually pretty hard.