In chess, a blunder is a critically bad move or decision that severely worsens the players situation by allowing a loss of material, checkmate, or anything similar). It is usually caused by some tactical oversight, whether due to time trouble, overconfidence, or carelessness). Blunders can occur at any point during the game, from the opening to the endgame, and can be made by players of all levels. What qualifies as a "blunder" rather than a normal mistake is somewhat subjective). A weak move from a novice player might be explained by the players lack of skill, while the same move from a master might be called a blunder). Blunders can be costly in chess, and it’s important to consider the opponents forcing moves, such as checks, captures, and threats, at each move to avoid them.