Public tables and Elo ranking on Coincheur
Updated
Fancy taking on other players? Coincheur's public tables seat you at a table within seconds, and every game counts towards an Elo ranking. Here is how to join a table, and how your Elo is worked out, with the game's own numbers.
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Joining a public table
- On the home screen, open Play with friends, or Leaderboard then “Play a public table”.
- Pick a nickname: other players will see it, and so will the ranking.
- Tap “Find a table”. The table starts as soon as four players are waiting; otherwise, after 20 seconds of waiting, it starts with the players present and Medium-level AIs in the free seats.
Seats are drawn at random: you choose neither your partner nor your opponents, and two players connected from the same internet address are never seated at the same table. The game uses Coincheur's standard rules (a game to 1000 points, no No Trump or All Trump), and the coach is off.
How your Elo is worked out
Every player starts at 1200. For each game, Coincheur works out each team's strength: the average of its two seats, a player counting for their Elo and an AI for a fixed strength (1250 for the Medium AI that fills the tables). From that it derives your expected score, between 0 and 1:
expected = 1 / (1 + 10^((opponents' strength - your team's strength) / 400))
Then your change: 32 × (result - expected), rounded, with a result of 1 for a win and 0 for a loss. The K-factor is 32: a game can never win or cost you more than 32 points. Both partners gain or lose the same number of points, and an Elo never drops below 100.
Worked examples
| Situation | If your team wins | If it loses |
|---|---|---|
| Two teams of equal strength | +16 | −16 |
| You (1200) and a Medium AI (1250) against two Medium AIs | +17 | −15 |
| Your team is 200 points below the other | +24 | −8 |
| Your team is 200 points above the other | +8 | −24 |
So beating a stronger team pays well, and losing to a weaker one costs a lot. These figures come from the formula above: they are calculations, not observed averages.
What counts, and what doesn't
- Counts: every game played to the end at a public table. Your first game puts you on the ranking.
- Leaving doesn't protect you: the game goes on, an AI plays for whoever leaves, and the result still counts. A player seated at the table who never showed up, on the other hand, neither wins nor loses anything: their seat is played by an AI.
- Don't count: private rooms with friends, a “new game” restarted at the same table, and a game where two players at the table are connected from the same internet address.
- At most 30 counted games a day (a day in universal time): beyond that, you play as usual, but your Elo stays put until the next day.
- No stuck tables: if you don't play within 60 seconds on your turn, an AI plays that move for you; if you are disconnected, it takes over 45 seconds after you drop out.
The Leaderboard screen
It shows the top 50 players, with their Elo, their number of games and wins, and your own place among everyone ranked. Two AIs serve as benchmarks, the Easy AI at 1000 and the Medium AI at 1250: they are shown at their level, without a rank, and take nobody's place.
Your line is tied to your browser by a random identifier, with no account: in another browser, you start again from 1200. Your nickname is public there, and an offensive nickname is automatically replaced by a neutral name. Your line is erased after 12 months without a ranked game, or straight away with “Erase all my data”.
Two friends against two AIs
To team up with a friend, use a private room instead: your friend is seated opposite you automatically, and two AIs, Easy or Medium as you choose, take the opposing seats. These games don't count towards Elo: the ranking only keeps tables where seats are drawn at random, so nobody can choose their opponents.
During the game, in a room or at a public table, six quick reactions replace chat: 👍, 😅, 🔥, 😮, 👏 and “Well played”, one every 2 seconds at most. There is no free chat, so nothing to moderate. To do well in the ranking, the guides when to double an opponent and how to win at coinche are a good start.
See also
FAQ
How do I join a public coinche table?
On the home screen, open “Play with friends”, pick a nickname and tap “Find a table”. The game starts as soon as four players are waiting, or after 20 seconds with Medium-level AIs in the free seats.
What Elo do you start with?
1200. Your first finished game at a public table puts you on the ranking.
How many Elo points do you win per game?
It depends on the strength of both teams, with a K-factor of 32: 16 points between teams of equal strength, more if you beat a stronger team, less if it is weaker. Never more than 32 points per game.
Do games with friends count towards the ranking?
No. Only public tables count, because seats there are drawn at random. A new game restarted at the same table doesn't count either.
What happens if a player leaves the table?
The game goes on: an AI plays for them, and the result still counts. Leaving a game that is going badly therefore doesn't protect your Elo.