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I used lichess to analyse some of my games (lichess.org -> tools -> import game). It puts my bad moves (and those of my opponent) in one of three categories; "inaccuracy", "mistake" and "blunder". I guessed from the names (and the positions) that an inaccuracy is better than a blunder, but I wondered what the definitions were.

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Blunder: 300 centipawns

Mistake: 100 centipawns

Inaccuracy: 50 centipawns

This is sourced from http://en.lichess.org/qa/75/how-are-these-determined-blunder-mistake-and-inaccuracy

It is the first thing that appears when you google "lichess inaccuracy mistake blunder".

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