This was mentioned in another thread: A ranking system of Invasion players in Poland!

I can't read Polish, I can barely read English (as made obvious from my Rules Discussion posts.) Does anyone know the equations for determining points / rank in this system? Is it a system that is used for other games that I could access easily, or was it designed just for Invasion? I think this would be great to institute in Canada, as people love closure and a ranking system would be able to say "There, you are 2nd of 6 players." Maybe more people would want to play!

It could also be used to reconcile the relative strength of playgroups depending on how the ranks work. For instance, if I ever find myself in Louisville and play an Invasion tournament there, it'd be nice to know how the strength of that group stacks up against my home group. I suspect the system is a simple one that rewards more games with more points, but any info is appreciated.

 I cant speak or read polish too but it looks like elo rating. Look it up at wikipedia.

So, this is a chess scoring system, but used for cards? Can someone verify that this is actually the Polish ranking system?

It seems to me like chess is non-random but cards are completely random (or should be, at least), thus you get a bad draw and your rating drops according to the chess scoring system.

If they do use ELO, there'd be nothing wrong with that. Of course there's randomness in Invasion, but if that bothers you, rankings and tournaments are impossible anyway. Due to luck, the superior player might lose a game to the inferior player, and that will impact both their ELO ratings, but this is short-term only. The more games you play, the more player skill matters in comparison to luck. If you gained more rating points due to luck than you should have based on your actual skill, you will lose them again rapidly, and if you lost some due to bad luck, it becomes easier for you to earn new ones. Works out fine.

Right, as long as everyone is playing lots of games, then it should average out. Which works when you have lots of tournaments with lots of participants.