Game Completion Rate - what does "completion" mean?
(1) percentage of games resulting in mate, resignation or draw? nah, doesn't fit the data
(2) percentage of games started that were not abandoned? same as (1) doesn't fit the data
(3) what?
Percentage of games that you completed (you didn't abort and you didn't disconnect).
Takes only about last 30 games into account.
I have been told that it's the percentage of your last 20 non-wins that you completed (didn't leave the game or abort). Someone please correct me if I'm wrong, I couldn't find a source.
lichess.org/forum/lichess-feedback/game-completion-rate-15#4"Afaik it counts disconnects, failure to start, aborts, and letting time run out instead of resigning. However, to calculate the value, they look at your last 30 games excluding wins and draws. So only games you lost and games you aborted are considered for this statistic"
None of the people who responded to that topic are Lichess mods, so we can't really know for sure unless a mod responds- or if someone can provide proof of their answer.
As I was quoted in #4: not really a “proof” of my answer, but strong indications I based my answer on:
1. That your own wins are not counted can be checked by each player individually. Obviously you cannot win a game and keep it incomplete at the same time.
2. The percentage values displayed on lichess are discrete, and the nature of the values hints to the base of 30 games: so far I have only seen completion rates of 100%, 97%, 93%, ... Now 30/30=100%. 29/30=96.67% approx 97%. 28/30=93.33% approx 93%.
If someone finds a completion rate that cannot be calculated as X/30 we have a proof that my answer was wrong. For example, if someone finds a profile where the completion rate is 98% then my answer was wrong.
lichess.org/forum/general-chess-discussion/bug-game-completion-rate-incorrect#8* Completion rate is calculated over your last 30 losses.
* If you abort or don't play a game, it will also count against your completion rate.
Thanks to everyone who responded! These answers are very helpful. Re: Aborted games, I think there are two types (1) for some reason having to do with mental illness, your opponent decides not to play after first agreeing to play just a few second ago, (2) mutually agreed aborted games, e.g. a club tournament when it is discovered at the last minute that the pairings are wrong, or the colors are reversed from what they should be. we abort the game, usually with no moves played, and start again. This doesn't happen often. In over-the-board chess I once had a situation (as the TD) in which two highly experienced players (one a US Senior Master) were playing a wrong initial position. Exactly nine moves had been played and, since it under 10, we were able to abort that game and start over (someone had set up Kings and Queens on the wrong squares - it was Round 1 and the two players started using this board and set "as is.").
uhh...
Megalovania
