This page gives a detailed view into the inner workings of the Zero-K rating system. The graph at the top shows the rating over time. Below you can find some more detailed information about current rating, ladder position and rank progress of the selected players.
Ratings consist of an expected skill and variance. The lower the variance, the more certain the system is of the assigned skill. Variance starts at infinity for new players and generally decreases as the number of played games increases. They are calculated using a system called Whole History Rating.
Ladder rating is used to rank players. It generally follows the WHR expected skill, but is subject to some other rules. Ladder rating starts out at 1100 for any new player. Each victory it increases between 1 and 50 points and on each defeat it decreases between 1 and 50 points. The exact change is calculated as a moving average that converges to the average WHR of the last 30 days. If no game has been played within the last 30 days, the player is considered unranked.
Player ranks, visualized as colored chevrons and stars next to their name, will change color depending on their rating. The rating required to reach a new rank is automatically updated so that each rank contains a set percentage of players. Thus, the rank color is a fairly direct indicator of a player's ranking percentile. The rank is calculated for every rating category, but only the best one is displayed.
In order to change rank in either direction, a player's rating has to surpass a 20% threshold into the next rank.
Zero-K is a free real time strategy (RTS), that aims to be the
best open source multi-platform strategy game available :-)