Chess Tempo: White to move wins. Black's last move: Kf8-e8

Can anyone who's better at chess explain why f5 is so bad here for black? I'm a low rated player (~1200), and this move looked so natural. I proceeded to get obliterated

white to move checkmate in 4 : r/chess

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If you had a chessboard on which White's pieces were in the standard starting position and Black had only a king, what would be the shortest number of moves for White to

Chess Room Newsletter #983

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Tactic: RELOAD to exploit alignment