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On an empty board, how can you place a White king, two White, rooks, and a Black king so that White can give mate in 4 ways from that position?
[FEN "8/8/8/8/8/8/2R5/k3K2R w K - 0 1"]
From this position, Kd2 Ke2 Kf2 and O-O deliver checkmate
Required, but never shown