Black to move. What is the least number of moves for black to checkmate the white king? Assume that both black and white play optimally.
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This is an easy puzzle that can serve as a warm up for tactics. You can see the mate in a second. The two rooks forms a battery. The front black rook checks the white king, the white king has only only one move, king to h2. Now the second black rook checkmates the white king.