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A double question mark marking a serious error.
Also known as: Double question mark, Blunder mark
Two question marks mark a blunder — a move that throws away a winning or drawn position, usually decisively. It is the harshest mark on the annotation scale.
Marks a move the annotator considers a blunder — a serious error, typically one that changes the result. A publishing convention rather than a rule.
Two question marks side by side, each a hooked stroke above a dot, written after the move.
Doubling intensifies in both directions: !! is the highest praise and ?? the harshest criticism.