1vs1 BZFlag League

ZELO Explanations

How do I compute my ZELO score?

Each player starts with a score of 1000 ZELO points.
After a game the new ZELO score for the winner and the new ZELO score for the looser (denoted by new_W(elo) and new_L(elo) respectively) are computed by the formula:

• new_W(elo) = W(elo) + int[C * A + A * max{0 , S * (L(elo)-W(elo))}]
• new_L(elo) = L(elo) - int[C * A - score * max{0 , S * (W(elo)-L(elo))}]

Where:

• W(elo) = Winner's ZELO before the game
• L(elo) = Looser's ZELO before the game
• score = Looser's score
• A= 10 - score
• S = 0.001
• C = 4+(L(elo)-W(elo))/250

and int[x] stands for the integer part of the number x.

Example

Match: root (1000) vs Zongo (1000),
Result: root wins 10-7
Thus we have: score=7, A=3, W(elo)=1000, L(elo)=1000 (before the game)
Formula now gives: root's new elo: 1000+12=1012; Zongo's new elo: 1000-12=988