1 {scene: the Millennium Falcon}
1 Han: I have a really bad feeling about this...
2 {Draak and Chewbacca are playing dejarik}
3 Han: I dunno which one of them is gonna rip the other’s arms out of their sockets first!

So - of course - there are documented rules for Dejarik, the holographic chess-like game they play in Star Wars. I expected they'd be kind of abstract strategy, like chess. But no... it's basically a tactical wargame, with each of the holographic monsters having different stats for armour, hit points, damage, attack range, movement, and so on.^[1]

And yes, I believe this is the first ever Fantasy/Star Wars theme crossover comic. (Reminder to myself: Add to the cast page after publication.)

[1] This is the official rules, as published in an officially licensed Star Wars Dejarik game. There are also many different fan-written version of rules, which differ.