https://support.chess.com/article/1135-what-is-accuracy-in-analysis-how-is-it-measured
How Is Accuracy Determined?
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I've been following some of these beginner tips like analyzing every game. After analysis however I find my accuracy jumps all over the place. One game I'll get a 93, then the very next it'll drop down to the 50s or 40s then back up to 80 again.