US Chess Tournament Helper
Compare two US Chess members through their shared opponents, look up rated histories and find events — plus why a handful of common games proves nothing.
Data comes live from the official US Chess ratings database. The first comparison of the day can take up to a minute while the server wakes up and pulls each player’s full game history; later lookups are much faster.
Player A
Player B
Player
What each tab does
Compare Players takes two US Chess members and works out how they match up. Because two club players have usually never met over the board, it looks for the people they have both played and compares their results against that shared field.
Individual Stats takes one player and summarises their rated history — results, the strength of the opposition they have faced, and how the rating has moved.
Find Tournaments searches upcoming and past events. You can look a player up by US Chess ID if you know it, or by name and state if you do not — the ID is the eight-digit number on a membership card, and searching by name will show you it.
How much to trust the common-opponent numbers
The comparison prints a performance rating for each player: roughly, the rating they played like against the shared opponents, rather than the rating they currently hold. Scoring evenly against a field means performing at its average; scoring above it means performing above.
That number is only as steady as the number of games behind it, and on a short shared history it is very unsteady indeed. Here is how far the performance figure moves if a player wins one more of their shared games:
| Games against the shared opponent | One more win moves the figure by |
|---|---|
| 1 | 800 rating points |
| 2 | 193 rating points |
| 3 | 122 rating points |
| 4 | 91 rating points |
| 6 | 60 rating points |
| 10 | 36 rating points |
| 20 | 18 rating points |
With two shared games, one result is worth 193 points — more than the gap between a strong club player and a master. With twenty, it is worth 18. And on a single shared game the figure carries no information at all: a player who has won their only game against someone has no measurable upper limit, so the calculation simply returns its maximum of 800.
So read the indirect rating gap as a hint about who has been playing better lately, not as a prediction. Check the games column before you believe any of it — and treat a comparison built on a handful of shared games as no comparison at all.
Reading a US Chess rating
US Chess keeps several ratings per player and they are not interchangeable. Regular covers slow games, Quick covers faster time controls and Blitz faster still. A player can be hundreds of points apart in two of them, and comparing someone's Quick rating with someone else's Regular tells you very little.
A rating is also provisional until enough rated games have been played, meaning it can move a long way on a single event. An established rating built over hundreds of games moves slowly; a provisional one is closer to a first guess.
None of these numbers translate to a rating from FIDE, Chess.com or Lichess. Each system runs its own separate pool of players, and a rating only means something relative to the pool it came from. Two players who both hold "1800" in different systems have not been shown to be equal in any sense.
How to use
- Pick a tab: compare two players, one player, or tournaments.
- Enter a US Chess ID, or search by name and state.
- The comparison uses opponents both players have faced.
- Check the games column before trusting any gap.
Frequently asked questions
What does Compare Players actually compare?
The opponents both players have faced. Two club players have usually never met over the board, so the tool finds their shared opponents and works out how each performed against that common field. It is an indirect comparison, and it is only as good as the overlap between the two careers.
How many shared games do I need before the number means anything?
More than most pairs have. On two shared games, one extra win moves the performance figure by 193 rating points, which is wider than the gap between a strong club player and a master. On ten it is 36 points and on twenty it is 18. Check the games column first and treat a handful of shared games as no comparison at all.
What happens on a single shared game?
Nothing useful, and the tool says so rather than printing a number that looks precise. A player who has won their only game against someone has no measurable upper limit, so the calculation returns its maximum of 800 and that figure carries no information whatsoever.
What is the performance rating it shows?
Roughly the rating a player played like against the shared opponents, rather than the rating they currently hold. Scoring evenly against a field means performing at its average, and scoring above it means performing above. Read it as a hint about recent form, not as a prediction of a game between them.
Can I compare a US Chess rating with a FIDE, Chess.com or Lichess one?
Not meaningfully, and this tool does not try. Each system runs its own pool with its own history, so the numbers are not on a shared scale and no conversion between them is reliable. Everything here stays inside US Chess for that reason.
Are Regular, Quick and Blitz ratings interchangeable?
No. US Chess keeps several ratings per player covering different time controls, and one player can sit hundreds of points apart in two of them. Comparing one person’s Quick rating against another’s Regular tells you very little, so compare like with like.
What does provisional mean?
That the rating is based on too few rated games to have settled, so it can move a long way on a single event. An established rating built over hundreds of games moves slowly; a provisional one is closer to a first guess and should be read as one.
How do I find someone’s US Chess ID?
It is the eight-digit number on a membership card. If you do not have it, search by name and state instead and the results will show you the ID, which you can then use for the other tabs.
Where does the data come from?
Live from the official US Chess ratings database, so it reflects whatever has been rated and published at the time you look. Nothing is stored by this page.
🌐 This tool looks up results using the official US Chess ratings database (US Chess MUIR). The word you enter is sent to that service to fetch results; nothing is stored by this site.