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Chess puzzle
Two-rook ladder
Two rooks take turns cutting the king off: one holds the seventh rank while the other mates on the eighth.
rook-ladderMate in 2 · Endgame
White to move and mate in 2.
Find the move that forces mate whatever the defence.
Hint: move the rook on a1.
Show the answer
Ra7 Kf8 Rb8#