Lichess removing a good function :(
What was wrong with it? Personally I'd always like to know if players gained or lost rating points in a tournament.
There are only two fresh pieces of data:
1. Performance rating: how well a player played in the event
2. Current rating: estimated player strength (overall, not just in the event)
It may be fun to compare these values (perf - current) to see whether a player overperformed or underperformed with respect to everything we know about the player.
In contrast, "rating gain/loss" is using stale data and generates results of dubious (but not always wrong) quality.
