An Inaccuracy is a move that is not the best option.
A Mistake is a move that totally weakens your position.
A Miss Is a move that misses a big advantage.
A blunder is a serious error that makes you lose the game.
What’s the difference between an Inaccuracy, Miss, Mistake, and Blunder?
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Inaccuracy Fix: Qb8!
Blunder Fix: Bxb7!