Facebook has a hidden game of Chess in Messenger. Yes, we were surprised too.
You can play it by hitting a secret command that lets you challenge any of your friends to a battle of the minds.
To start the game, all you need to do is send "@fbchess play" to the person you would like to play with.
A miniature green and white Chess board then pops up.
To carry on with the game, you will need to is use 'Standard Algebraic Notation,' which sounds complicated but it is actually quite simple once you get the hang of it.
To move your pawn for example, type in "@fbchess h6" and the game will perform the action.
If you get a little lost, you can also punch in "@fbchess help," which will pull up the following instructions.
There also appears to be a Facebook page dedicated to the hidden game. Happy gaming.