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Ranking calculation
Base rank
n is the number of participants in the tournament
p is a player's place among the participants in the tournament
r is a player's base rank for a tournament:
Weights
A player's total ranking is a weighted sum of base ranks from all tournaments. The tournament weights are:
- w = 1 for a local tournament
- w = 2 for a national championship
- w = 5 for a European championship
Time limit
- Tournaments get half weight after 2 years.
- Tournaments no longer count to the MERS after 4 years.
Normalization
Multiply the ranking with 1000 in order to get "nice numbers". That way all rankings will lie between 0 and 1000 instead of 0 and 1.
Total ranking
Subscripts 1, 2, 3 etc. refer to different tournaments. Using weights a player's total current ranking, R, is:
| R = |
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w1*r1 +
w2*r2 +
w3*r3 + etc.
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w1 +
w2 +
w3 + etc.
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| * 1000 |
In other words: the total ranking, R, is a weighted sum of the base ranks. The equation above says that the weighted sum is calculated by adding all the base ranks after they are multiplied by their weights, and then divide this result by the sum of weights.
Oprettet 2005-09-17
Tina Christensen
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Opdateret 2007-11-12
Tina Christensen
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