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Tell us what is wrong, or who is missing

Think our math is wrong? Prove it.

The rules are summarized publicly; the full formulas are available to registered members. The method is a hypothesis we test, not a verdict. If you can show a better rule with evidence, we will change it, and we will credit you by name in the changelog if you agree.

Mathematicians, statisticians and analysts especially welcome. Read the rules first: the math, the backtest plan.

Challenge a ruleShow a better rule with data or a proof. If it holds up, we change the method in a new public version.Correct a numberA minute, a market value, a club, a date. Send the right figure and the source link.Suggest a playerKnow a professional footballer we should rank? Send his name and a link to his profile.

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Challenge a rule (all optional)Which ruleYour proposed change (formulas allowed)Evidence or reasoning (links, data, a proof) Credit me by name if my change is adopted

Player (optional)Page or player this is about (optional)Source link (optional)Message

Up to 2000 characters, at most 2 links. For a data correction, include the figure you think is right and a link to the source.