Chess move grading guides

Explore questions chess players ask about move labels. ChessGrade is in development; early access is free.

• Why is a brilliant chess move labelled brilliant?

  Why is a brilliant chess move given that label, and can it be nearly best? Understand one documented classification and its limits.

• Inaccuracy, mistake and blunder: what is the difference?

  Learn what inaccuracy, mistake and blunder labels can mean, why grading systems differ, and how to interpret a surprising move label.