Over the years, Facebook has had a number of hidden easter eggs that provide sheer joy and amusement to those who find them. Whether through your favorite internet browser or in its mobile app incarnations, the largest social network knows you’ve been at it every step of the way. If you’re still looking for more, there’s a hidden chess game for you to play in Facebook Messenger.

If you want to engage in a battle with a friend, type in “@fbchess play” in the message box and battle it out. It’s all so interesting if you’re an avid chess player, or if you just want to hang out with your friends a bit differently.

However, it’s important to note that while you’re working with a touchscreen, the interface isn’t as intuitive as you have first imagined. You’re going to have to rely on text commands for every move you make, so it’s really essential for you to learn the standard chess notations if you want to beat your friends in this game.

Once you’re done getting your brains all worked out, you can end the game by simply typing “@fbchess resign” to put you and your friend out of your misery. While chess is a really fun game to play, it could have delivered a better experience if it made full use of the touchscreen feature. But of course, to keep things fair with desktop users, there’s parity that its developers had to keep in mind.

The chess game feature on Facebook was discovered by a Reddit user who goes by the name of “jargonaught.” However, the game has already been widely present for over a month now, which the age of the thread kindly indicates.

If you’re adept at playing chess and you’re already familiar with the standard chess notations, then this new Facebook easter egg may be the thing for you.