As far as I'm aware they never explain the rules of Stratagema. I feel pretty comfortable saying it seems like a terrible esport to spectate. You've got
Incredibly quick games (Data's first game with Kolrami ends in less than thirty seconds), so there's little to no time to appreciate whatever finer strategies are going on
crap graphics-- style is very bland and more importantly user unfriendly--as far as I can tell there are four colors, navy/blank, some sort of territorial highlighting colors (blue and yellow), and a red that appears to be units/agents of both players, which are not visually distinct except for small markers (seriously, why?).
probably crap controls-- I get you have to move multiple things simultaneously, but you'd think they'd make something more intuitive for whatever 3-D controls this game needs. With the benefit of modern video game hindsight I think something like a mini keyboard in one hand would be a lot more believable for whatever quick selection and movements are needed by this game.
Basically, take a minimalist strategy game like Go and an RTS game and stick them together in a way that uses the strengths of neither. That's Stratagema. Don't play this game, it's dumb.
(Minor edit, after thinking this over a little it's possible the red pieces are neutral objectives. I don't think that correlates as well with the finger movements, but whatever. That'd just make Stratagema 3d Liquid War with mario kart powerups tacked on)