Something to add flavour to your game I propose self imposed challenges. A challenge that you only do, the other player can do another challenge or play however he wants.

We played this today on the server. Some challenges that where used:

• Polite challenge - always bow the first 20 frames
• Stroke challenge - half of body must be relaxed at all times
• Mano challenge - Joints can only be full force or relaxed
• No grip challenge - No gripping
• No hands challenge - always start by removing your hands

etc..