Match points are used for pairing and tie-breakers. Each guild earns 3 match points for every match they win, and 0 points for any draws or matches lost. Each guild is assigned an additional 0 to 0.999 match points based on their opponent's match win percentage. In short, these additional match points will be higher when you defeat opponents with a lot of wins than when you beat opponents with a lot of losses. These additional match points are calculated every time after a round, so they don't add up. This means that if the opponent you beat in the first round wins all other rounds your additional match points will rise.