Checkmate in one puzzle

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laurengoodkindchess

Hi! My name is Lauren Goodkind and I'm a chess coach based in California: www.ChessByLauren.com.  

White to move. What's the best move? This puzzle was taken from a recent game that I played.  

MarcLawson
Rc6
Rajjal

Rock c6

Grafakos

All the king's escape squares are covered, so white just needs to check him, and there's only one move that does that.

ShaanThebest

Rc6?

imkurkure

Rc6#

RoughlyUnderscore

rc6#

Infinite_Blitz

lol there is only 1 check so that is kind of obvious.....