The move which is not best also not blunder or mistake
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I'm relatively new to the site but not to chess. When I look at the analysis of my games/moves I see a number of inaccurate moves. WTH is that? Is the analysis comparing the moves to some standard move the AI expects to see? I play very unorthodox so I really don't care how the computer rates my moves but it's a curiosity.
An inaccuracy is a small mistake, but not one bad enough to shift to drastically effect the evaluation of a position. Perhaps a simple hypothetical example would be playing a move that wins a bishop but missing a move that wins a bishop and a pawn.
In analysis tools, it is the computer algorithm that dictates whether a move is considered inaccurate or not (based on other good moves in the position). Sometimes it is clear for a human to see why the computer rates a move as an inaccuracy and sometimes not.