How do Battle points work

I lose 5 games in a row and am down 200 points, then i win a game and get 10 points. No point in even trying to get to the next rank. Has anyone ever received a clear explanation of how the battle points work?

It is based on your trophy count versus opponent’s trophy count. If you are both the same then it will be 30 points up or down for a win or loss. For every 10 trophies less than your opponent you have you gain one extra trophy for a win with a maximum of 50 trophies if you beat an opponent with 200 more trophies than you. The opposite for every 10 trophies you have more than your opponent with a minimum of 10 trophies for a win against an opponent with 200 trophies less than you.