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acpl from chess insights

From time to time I check my chess insights (for fun and anxiety..), and over some months I see my Rapid (or before Classical) acpl swing between 27 and 32, going up and down even without me having played a game. How does that work ?
ACPL is only calculated for games that have a computer analysis. If you've been analyzing rated games from the past during that time, it could change the ACPL.

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