Visit this link: coronate.netlify.app.
Yes, this way it can be used on any OS.
Yes, use your favorite browser.
Yes, the source code is free to use and requires minimal system dependencies. See the development section of the readme for more information.
Use the "Click here to load the demo data" button to get dummy tournaments. You can remove all or some of the players, add players yourself, or change the names. You can even start a fresh empty tournament with the "Add tournament" button in the "Tournaments" tab.
For each tournament, you can select which players to include or include "all."
There is no need to set your total amount of rounds to be played. Coronate uses Swiss tournament rules to automatically calculate the following rounds.
Yes, and this is the minimum. With any number of players, when many rounds are played the program may pair some players again, but preferably with colors reversed.
There's no hard limit. So far we haven't found a number that will make it crash though.
Yes, sometimes people want to join later, it happens. Before each new round you can add players to the list, or unselect players which want to skip a round or just leave.
Can I save / export all results up to a certain round and later use those to continue the same tournament?
Yes, all your data can be exported to a single JSON file, a common open data format. Later you can load that file, see the Options page.
This is not recommended. You might corrupt the tournament (JSON) file if you don't know what you're doing. It's best to change any settings, e.g. player names, by the program menus.
Yes. In the "Players" tab of the main menu, click on the player you want to edit and you can change their name on the form that displays.
Yes. In the "Players" tab of the tournament screen, click the "Edit player roster" button. From there, you can uncheck the player you want to remove.
This will exclude the player from any future matches. It will not affect any matches they already played.
Yes. From the round screen, elect the pairing(s) you want to remove and click the "Unmatch" button. Then, on the "Unmatched players" tab, manually add the two players you want to pair and click the "Match selected" button.
Yes. On the "Players" tab of the home screen, select one of the players. Then find the other player on the "players to avoid" dropdown menu. Click "Add" to force them to avoid each other.
This will practically guarantee that they will never match. It may still be possible to artificially force them to match in pathological situations, though (e.g. if every other player was also told to avoid them too).
No, this feature is not implemented (yet).
If player with rating r1 earns s score against player with rating r2, and
has match count c, then:
k_factor = if c < 30 then 40 else if r1 > 2100 then 10 else 20
expected = 1 / (1 + 10 ^ ((r2 - r1) / 400))
new_rating = r1 + k_factor * (s - expected)
Score s is 1 if the player won, 0 if they lost, and 1/2 if they drew.
I copied these formulas from Wikipedia. They're a best-effort for a small tournament, and I don't recommend using Coronate as an authoritative rating calculator.
The Swiss system automatically sets the number of rounds based on your number of players. You can manually add extra rounds if you really want to, though.
Coronate uses the Swiss system. This automatically calculates the most efficient series of pairings to determine a winner in the smallest number of rounds. It mainly pairs players according to their scores from past rounds, and avoids that any two players meet.
To make the Swiss system work, Coronate mainly pairs players by their scores. It also looks at their ratings and tries to balance each player's "white" and "black" turns, although those are less important.
If you don't like the automatic pairing, you can manually pair players too.
On the tournament screen, click on each numbered round under the "Rounds" in the sidebar.
On the tournament screen, click on the "Score detail" on the sidebar.
No, there's no print function inside the program, but your browser can print any (web based) page, also create a (PDF) file.
You can remove the most recent round with the "Remove last round" button on the tournament screen. To remove a round before that, you have to remove the rounds that came after it first.
Normally this is done automatically, the program always finds a best suitable opponent, according to rating and tournament results so far.
No, Coronate uses a hard-coded set of rules which are not (yet) customizable.