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Whether a single or double question mark is used is subjective and may depend on the player's strength. A move that overlooks a forthcoming brilliant combination from the opponent would rarely receive more than one question mark, for example. The nature of a mistake may be more strategic than tactical in some cases, the move receiving a question mark may be one for which it is difficult to find a refutation. Mistakes often lead to loss of tempo or material. ? (Mistake)Ī single question mark "?" after a move indicates that the annotator thinks that the move is a poor one and that it should not have been played. Blunders occur at all levels of play to all human competitors. Occasionally, the sign is used for a move which transforms a won position into a draw, perhaps because the annotator feels that the mistake is unworthy of the player's skill level. A "?"-worthy move usually results in an immediately lost position. Typical moves which receive double question marks are those that overlook a tactic that wins substantial material or overlook a checkmate. The double question mark "?" indicates a blunder, a bad mistake.
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