mate in 1
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I do not see the checkmate... Every move is check...
For example,
1.Bf4 is met with a Bd6
2.Rc8 and Bd8 is met with Kd6
3.Re7 is met by Bxe7 or Kd6 again!!!
The position is showing that you must not allow the king to have the option to the d6 square.
The only thing I can think of is that the rookwas supposed to be promoted into a knight instead of a rook.