The rankings currently use the same selection criteria that the Top 100 lists use, with one exception. A player must have a published and established US Chess rating to be included in the Top 100 lists, but players who have enough games for a published US Chess regular rating (eg, 4) are included in the rankings.
These are national rankings, not international ones, though all US Chess members are included in the rankings, even those who live outside of the USA or who are registered with FIDE under another nation.
As an example of how the selection criteria work, here’s the criteria that were used for both the April 2014 Top 100 lists and the April 2014 rankings:
- US Chess membership that expires on or after January 1, 2014.
- Most recently rated event rated on or after March 1, 2013.
- For the age based lists, age as of April 1, 2014. The junior list is for players who are under age 21, the senior list is for players who are age 65 or older.
Age, sex and state information are drawn from US Chess records, please send corrections firstname.lastname@example.org.
Percentile rankings are also shown, eg, the top 5% are in the 95th percentile and the 0.1% are in the 100th percentile.
The rating used for rankings are official ratings, which are issued once a month, and will be updated when a new official ratings list is generated, but rankings can change during the month if other information (eg, membership status, birthdate, address) change.
When a ranking is follwed by ‘(T)’, it means there is a tie for that position.