In 2014 PUL introduced the ladder system to help improve the quality of games week-over-week by pairing more evenly matched teams. This is a departure from the common standings approach, but it does better re ect current team results. Calculating that rating is based on this:
- A team’s percentage chance to win is computed based on the pre- game ratings values. This will determine what percentage of the game’s value the team must contribute. For example, if both teams are evenly matched, they will each contribute 50% of the total. If instead, Team A has a 60% chance of winning, they contribute 60% of the total value.
- After the game is complete, the pot value is computed. The pot value is double the winning score plus 10. For a normal game to 15, this would make the pot worth 40 points. For a game that ends in a timecapped win at 12, the pot would be 34 points. A game ending 17-16 after an overtime universe point would be worth 44 points.
- Each team’s contribution is calculated by multiplying the pot value by the team’s percentage chance to win. This represents the maximum number of ratings points that team could lose.
- The losing team then gains back the number of ratings points equal to their score. In an evenly-matched game ending 15-10, the losing team would gain back 10 points for a total loss of 10.
- The winning team then gains the remainder of the pot. So, for example, if their contribution was 20 points, and they won 15-10, they would get a pot of 30, for a net gain of 10. Consider this scenario:
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- Team A (1500 pts) plays Team B (1300 pts). Based on their relative points, Team A has a 54% chance of winning, Team B has a 46% chance.
- They play and Team A wins 13-9.
- Pot value is the winning score (13) x2 +10. Team A contributes 19 pts and Team B contributes 17 to the pot. Team A now has 1481 and Team B now has 1283 points.
- Team B gets back as many points as they score – in this case 9. Team A gets the rest – in this case 27.
- For the next week Team A has 1508 pts and Team B has 1292 pts.