#3268: Offside

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[A single-panel comic showing a standard 8 by 8 chessboard. The game is in progress with black and white pieces scattered across the board. Near the top of the board, a white rook is highlighted with a bright yellow background square. It sits immediately to the left of the black king. A horizontal, dashed red line cuts across the upper third of the chessboard. On the right-hand side of this line, past the edge of the board, is a red-and-yellow checkered assistant referee's flag.]

[Caption below panel:]

I thought I had checkmate, but I didn't realize my rook was offside.