Methodology
How every figure is calculated.
FIDE Insights reads the public data in FIDE's official rating database. Nothing is estimated or made up: every figure comes from its records with the definitions on this page. Source: ratings.fide.com.
The data
- Profile: name, title, federation, year of birth, current ratings and ranking positions, from the player's FIDE profile.
- Rating history: the official classical, rapid and blitz rating published on every monthly list. The chart shows those values; it does not rebuild them.
- Games: every game on FIDE's individual calculation pages: tournament and dates, opponent and their rating, colour, result, the player's own rating used in the event, the K-factor and the rating change.
Data is stored after the first look-up. Updating only downloads new lists, at most once every 6 hours per player, to keep the load on FIDE's servers to a minimum.
Definitions
- Score
- Points per game as a percentage: (wins + ½ × draws) ÷ games. It is not the win rate: drawing every game scores 50%.
- Performance
- FIDE's performance rating: average opponent rating plus dp, the difference matching the score in FIDE's conversion table (Handbook B.02, table 8.1a). 75% gives +193 and 50% gives 0. Only games against rated opponents count.
- Above or below their rating
- Performance compared with the rating the player had in each game (the one FIDE used for that event), not with today's.
- Expected from ratings
- The score FIDE's formula predicts for each game from the rating gap (table 8.1b; gaps over 400 points count as 400). Comparing it with the real score shows whether someone scores more or less than their rating suggests.
- Opponent strength
- Rating gap at the time of the game: opponent's rating minus own rating. Much weaker: over 200 below · Weaker: 51 to 200 below · Similar: ± 50 · Stronger: 51 to 200 above · Much stronger: over 200 above.
- Rating ±
- The sum of FIDE's per-game rating changes (K × (result − expected result)). Changes in different time controls belong to different ratings, so they are always shown per time control.
- Rating gained in a year
- Official rating on the year's last list minus the one on the previous year's last list.
- White against Black
- Score and performance with each colour. A preference is only stated with at least 10 games per colour and a performance gap of 30 points or more.
- Recent form
- The last 12 months with games in the selection, and the last 12 tournaments: performance in each one minus the rating it was played with.
- Streaks and dates
- FIDE publishes each tournament's start and end dates and the order of the games within it, but not the date of each game. Games are ordered by the tournament's end date and then by that order; monthly activity uses the tournament's end date.
Limitations
- FIDE only publishes game-by-game data from about 2008.
- Games against unrated opponents and forfeits do not appear on FIDE's calculation pages, so they are not counted.
- Games between two players are matched by the name exactly as FIDE writes it.
About the project
FIDE Insights is an independent project by Odyssey Miranda and is not affiliated with or endorsed by FIDE. All rating data is © FIDE.