Thinking & Calculation
What is a Blunder in chess?
- Error
- Tactical
- Severe
A serious error that loses major material, allows mate, or throws away the result immediately.
What to look for on the board
- Unanswered checks.
- Loose queen or rook.
- Mate threats around your king.
Builds on
Related terms
Free game review
See where blunder decides your games
Chessiro reviews your games with an AI coach that names the concept behind every mistake, then drills you on the exact positions where it happened until you stop repeating them.