National team rankings are calculated from results, but not from results alone. The weighting attached to each match determines what a team gains from winning, and it has reshaped how fixtures are arranged.
Counting wins alone produces bad incentives
A system that rewards victories equally invites teams to play the weakest available opposition as often as possible.
Under earlier versions of the ranking, arranging comfortable friendlies was a rational way to climb, and some associations did precisely that.
The rankings then stopped describing strength and started describing scheduling policy, which undermined the purpose of publishing them. A measure that changes behaviour must account for the behaviour it changes.
Points now move between the two teams
The current approach exchanges points between the sides according to the result and the gap in their existing ratings.
Beating a much weaker team transfers very little, while beating a much stronger one transfers a great deal, and losing to a weak side is expensive.
Because the exchange is symmetrical, the total in the system is broadly stable and a team can only rise by taking points from somebody else. Inflation is impossible, which keeps positions comparable across years.
Match importance still applies a multiplier
Friendlies, qualifiers and tournament matches carry different weights, so a result in a major tournament moves a rating more than the same result in a warm-up.
The multiplier reflects the assumption that teams play closer to their true strength when something is at stake. A friendly result is treated as weaker evidence, and weighted accordingly.
It also reduces the damage from experimental selections in friendlies, which associations use to test squads rather than to protect a rating. Coaches can experiment in a warm-up without a lasting cost.
Rankings feed back into competition design
Positions are used to seed draws for qualifying groups and tournaments, which means a rating directly affects the difficulty of a team's next campaign.
That creates a compounding effect, since a favourable draw produces better results, which produce a better rating and another favourable draw. Rising through the table therefore gets easier the higher a team already sits.
It also gives associations a strong practical reason to care about a figure that would otherwise be a talking point.
The formula's limits are well understood
Teams from regions with few strong opponents have limited opportunities to gain points, regardless of how good they are.
Friendly fixtures against distant, highly rated opposition are expensive to arrange, so the ability to improve a rating is partly a question of budget.
The governing body accepts these limitations, arguing that a transparent formula applied consistently is preferable to a subjective assessment of strength.
