How is this puzzle wrong?

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Avatar of BigVolleyball
How is this puzzle not mate in 1?

https://www.chess.com/puzzles/problem/1092380
Avatar of BigVolleyball
https://www.chess.com/puzzles/problem/1092380
Avatar of portilhe
It can’t be white’s move. Black’s in check, it would have been an illegal move.
Avatar of ThilinaAnjana

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