How does white checkmate black in one move? A puzzle!

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laurengoodkindchess

Hi! My name is Lauren Goodkind and I’m a chess coach and chess YouTuber based in California: 

https://www.youtube.com/channel/UCP5SPSG_sWSYPjqJYMNwL_Q  

White to move!  How do you checkmate black in one move? This position was taken from a game that I recently played.  

SaiSatyanandMandol

Ra8#

laurengoodkindchess

Correct!

brisket

Ra8#

joacopuerto

I can't see the whole picture... :(

eric0022

I wonder what the rating of the player holding the Black pieces is. The material disparity is large.