Hello everyone. My name is Dylan. I am just curious as to know when a Provisional rating becomes a regular rating? What is the number of games necessary to have your rating become regular? I have played 25 rated games now and am just wondering. Thank you!!!

The answer to your question, and a little more.

âRegular Ratingsâ are those under the âRegularâ or âStandardâ Rating system, as opposed to âBlitzâ or âQuickâ or âCorrespondenceâ. What you mean to ask is when do provisional ratings become established ratings?

Mark Glickman, the Chairperson of the Ratings Committee, maintains a page with information on the rating system at:

If you look at this file: glicko.net/ratings/rating.system.pdf it has the current ratings specifications for US Chess.

The first point of the specifications outlines things as:

So provisional ratings become established after 25 games.

One caveat (doesnât apply to you) is that the rating will remain provisional if all of your games were losses. Iâve seen 46-game ratings that were still provisional because the player had not yet had a rated win or rated draw.

Are you sure it doesnât become established after the tournament that includes your 26th game? I.e. once you have more than 25 games.

Ratings are processed tournament by tournament, not game by game. So saying that your rating becomes established after 25 games, is pragmatically equivalent to what you wrote.

So provisional ratings become established after 25 games.

Are you sure it doesnât become established after the tournament that includes your 26th game? I.e. once you have more than 25 games.

Ratings are processed tournament by tournament, not game by game. So saying that your rating becomes established after 25 games, is pragmatically equivalent to what you wrote.

Not if your 25th game is the last round of a tournament.

It may be worth noting that the distinction between âprovisionalâ and âestablishedâ ratings is much less than it used to be. Way back in the day, a provisional rating was the average of the opponentâs rating plus 400 for a win, minus 400 for a loss. Currently, the rating system uses a âspecial formulaâ for a playerâs first eight games; thereafter, the playerâs rating is computed in the same manner as any other rating. The main difference is that the K factor is larger for players with very few games, making their ratings more volatile.

(For the (other) nitpickers in the audience, the special formula continues to apply after eight games if the player has either won all his games or lost all his games. In that case, as soon as the player has a different result in a game, the regular formula applies.)

Ratings are processed tournament by tournament, not game by game. So saying that your rating becomes established after 25 games, is pragmatically equivalent to what you wrote.

Not if your 25th game is the last round of a tournament.

Thatâs probably why Kevin said âafter 25 gamesâ rather than âat 25 gamesâ.

It may be worth noting that the distinction between âprovisionalâ and âestablishedâ ratings is much less than it used to be. âŚ

The distinction could still be important if the OP is considering playing in one of those rare events where provisional ratings donât count, e.g. where provisional players would be forced into the Open section and not allowed in the Under-xxxx sections, or something like that.

Bill Smythe

It may be worth noting that the distinction between âprovisionalâ and âestablishedâ ratings is much less than it used to be. Way back in the day, a provisional rating was the average of the opponentâs rating plus 400 for a win, minus 400 for a loss. Currently, the rating system uses a âspecial formulaâ for a playerâs first eight games; thereafter, the playerâs rating is computed in the same manner as any other rating. The main difference is that the K factor is larger for players with very few games, making their ratings more volatile.

(For the (other) nitpickers in the audience, the special formula continues to apply after eight games if the player has either won all his games or lost all his games. In that case, as soon as the player has a different result in a game, the regular formula applies.)

Yep. Itâs really not a big deal or a nit worth picking. Itâs after 25 games. One does better to play over a Capablanca game than to count how many rated games theyâve played to date.

So if the OP plays one more rated game then his rating will be established, unless all of his games were losses.

On a related note, is your own rating adjustment counted any differently if your opponentâs rating is provisional? Iâve had instances where my post tournament rating would change after my opponentâs rating inexplicably dropped and he was either unrated or a provisional player with very few games played.

On a related note, is your own rating adjustment counted any differently if your opponentâs rating is provisional? Iâve had instances where my post tournament rating would change after my opponentâs rating inexplicably dropped and he was either unrated or a provisional player with very few games played.

I donât understand. Do you mean on a re-rate? It is my understanding that the algorithm does unrateds first, then provisionals ((at lleast those under the special rating formula), then everybody else. It may have changed, though. Still, players with very few games are much more likely than players with many games to be strongly effected by a re-rate.

Alex Relyea

So if the OP plays one more rated game then his rating will be established, unless all of his games were losses.

On a related note, is your own rating adjustment counted any differently if your opponentâs rating is provisional? Iâve had instances where my post tournament rating would change after my opponentâs rating inexplicably dropped and he was either unrated or a provisional player with very few games played.

If events are initially rated out of order then the periodic re-rate will put them in the correct order. That would change it so that the second tournament (initially rated first) would be changed to use the post-first-tournament-rating and the first tournament (initially rated second) would use the original rating and not the one modified by the second tournament.

If an error is discovered (wrong ID, forfeit erroneously rated as a played game, other wrong result) then the game is corrected and a rerate done to fix the problem, with a rerating cascade then done to fix any other tournaments that had rating changes dependent on the changes in the erroneous tournament.

So if the OP plays one more rated game then his rating will be established, unless all of his games were losses.

As no one has yet answered the question in this post, I will. No. There is no difference in a playerâs rating adjustment based on whether the opponentâs rating is established or provisional (or even unrated at the start of the event).