Why checkmate is a wrong move in this puzzle?

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DeutscheGabanna

Toldsted

Because it is not checkmate. White can put Knight and Queen between the Rook and the King and in that way cover the King.

Arnaut10

After doing a puzzle wrong, you can analyze the position first by yourself and after that you can also use engine to help you if you stuck somewhere, that is the best way to find out why your solution was not the best move and your tactics will improve quicker

DeutscheGabanna

Thank you I'll keep that in mind

Anniekal

And white will put his knight too

CenterMass51075

Rf2# was the correct move

Don’t forget to look for all possible moves

Toad1258

Rf2# is checkmate. when trying to checkmate look at the opponents pieces and see if the can protect the king

probium

Rd8+?

Vietnamxanh2k14

Rf2# it's checkmate