7-21-17 Daily Chess Puzzle ends in blunder

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Avatar of EOmcBug
In today's daily chess puzzle, it ends with Rd7, a blunder allowing white the easy win. According to stockfish, black is as good as lost after this move.

Why did this happen?
Avatar of Martin_Stahl

Probably just a mistake in posting the puzzle. Very likely meant for the rook to move to d8 and they didn't catch it. I have reported it and I imagine others have also so it should be fixed at some point.