There's a painful irony at the heart of chess improvement: the games you lose reveal exactly what you need to learn, yet most players never review them. They close the app, feel frustrated, and start a new game — repeating the same mistakes indefinitely.
A chess blunder analysis tool changes this cycle. Instead of vague awareness that "I blunder too much," you get concrete data: which types of positions cause your blunders, at which point in the game they happen, and — most importantly — the specific thinking error behind each one.
73% of Games
are decided by a single blunder or mistake in amateur play.
3× Faster
improvement rate when players review their own mistakes systematically.
Move 18
the average move where the decisive error occurs in amateur games.
The Three Types of Chess Blunders
Not all blunders are the same. Understanding which category your mistakes fall into is the first step to fixing them.
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Tactical Oversights
You simply didn't see your opponent's threat. A fork, pin, or skewer that you missed entirely. These are fixed through tactical pattern training.
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Calculation Errors
You saw a tactical sequence but miscounted the moves. You thought you'd win material but misread a trade. These improve with deliberate practice.
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Strategic Misjudgments
You made a move that seemed logical but violated a positional principle. Harder to see, but impactful as you climb the rating ladder.
How MoveSense Identifies Your Blunders
When you run a game through MoveSense's blunder analysis tool, the engine evaluates every position before and after your move. A blunder is defined as any move that causes a significant drop in your evaluation.
But raw evaluation drops don't tell the whole story. MoveSense's AI Coach adds the critical layer: a human-readable explanation of why the move was bad. Not just "Nf3 was better," but "This move left your king unprotected on the diagonal."