Note: In general the sign game is done with a double movement and the fronts of the fists make contact both times. But I've seen highly skilled signers like Dennis Platt (world traveler, heavily involved with Deaf sports events, and former president of the Utah Association for the Deaf) do this sign using a single movement without the hands touching.
So, here is my advice: When you are referring board games or simple little games between a two players then go ahead and do this sign with a double movement with the knuckles of the hands butting up against each other similar to the way rams butt their heads together. (That's just an example, do the sign lightly so as to not hurt yourself.) If you are referring to a sports match just do the movement one time and don't bring them all the way together.
