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PF Rankings Methodology

NSD’s PF rankings use an ELO rating system where each team has a base rating of 1500.

Under an ELO system, the winner and loser of each round gain and lose points based on their relative ratings. Defeating a team ranked higher than you gives you a big boost, while beating a weaker team will benefit you slightly. Conversely, losing to a higher rated team will only cause your rating to drop a bit, while a loss to a lower rated team will drag your rating down more significantly.

We add a multiplier to the effects of the results of paneled rounds depending on the panel’s decision. A 7-0 is a more decisive than a 4-3, so we weight these decisive wins accordingly. Additionally, we account for the fact that teams may drop one or two panelist’s ballot(s) to a team they would never drop a ballot to otherwise, since teams may attempt to appeal to the average judge rather than every judge in a paneled round. In other words, a 2-1 decision is more decisive than 2 single judge wins and 1 single judge loss, since a good team often neglects the lay judge in favor of winning the two flow judges in a paneled round. Moreover, our multiplier system prevents a team from ever losing points despite winning a paneled round. Other ELO rankings system may punish a team for winning a 2-1 decision against a weaker team, since these systems count a 2-1 decision as 2 wins and 1 loss. We don’t think this is fair or accurate, as a good team will do what it needs to win a round and may even neglect a panelist in the process, not caring if they drop a single ballot to a team they normally beat 3 out of 3 times. For more information, our multiplier system is detailed in the chart below:

Decision

Multiplier

7-0

2.5

6-1

2.25

3-0

2

4-1

1.75

5-2

1.75

2-1

1.5

3-2

1.25

1-0

1

4-3

1

We also give an extra bonus for any type of elimination round win and make this bonus greater at the highest bid level tournaments. This intentional bias reflects that judging is most reliable in these rounds and that teams themselves put more of an emphasis on being prepared by the time these rounds happen, as success in these rounds is ostensibly the primary goal of competing in the national circuit.

These rankings are maintained by Inko Bovenzi and include data from every bid tournament that posts its results on Tabroom.

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