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Lila
Discontinued ♞ lichess.org: the forever free, adless and open source chess server ♞ [Moved to: https://github.com/lichess-org/lila] (by ornicar)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I put together another plot showing the same elo vs. time graph, but with a cutoff of 800 elo gain here: https://github.com/jcw024/lichess_database_ETL/blob/main/analytics/plots/blitz_elo_over_time/blitz_elo_over_time_800_elo_cutoff.png
That bump and dip in the first graph is interesting. The author speculates it could be due to player churn. I wonder if the period of intentional inflation could be part of the cause.