A mistake in chess is a significant error that greatly weakens a player's position, often resulting from tactical oversight, overconfidence, or carelessness. While this concept is subjective—what qualifies as a mistake depends on the player's skill—examples from historic games, such as Mikhail Chigorin’s fatal miscalculation in 1892 or Kramnik’s infamous 2006 "blunder of the century," demonstrate its impact.
Authors like Hilaire Belloc and Henry B. Wheatley examined mistakes as human failings, connecting them to moral or intellectual errors. Combining these viewpoints, a mistake goes beyond chess, representing the delicate boundary between human fallibility and strategic accuracy.