#3268: Offside

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[A single-panel comic showing a standard 8-by-8 chessboard, with the position 4Rk2/8/2p2p2/1p2PNbB/B2pn2n/1Q1P4/r4P2/3K4 b, with the most recent move of the white rook from e7 (green background) to e8 (yellow background). The black king on f8 is in check from the white rook on e8, and trapped by the white knight on f5, the white bishop on h5, and redundantly the white queen on b3. A horizontal, dashed red line cuts across the chessboard above the sixth rank, where the least advanced black pawns are. On the right-hand side of this line, past the edge of the board, is a checkered red-and-yellow soccer referee's flag.]

[Caption below panel:]

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