Duolingo has been through a lot of changes over the past few years. What was once solely a language-learning app has grown into a social media marketing machine, a destination for math and music lessons, and now an online chess tutor.

In June, Duolingo launched a Duolingo Chess course to teach beginners the basic rules and moves by allowing them to play against an AI tutor named Oscar. This month, the company is taking the course further, launching a multiplayer version of the game where users can compete against one another.

Duolingo, which is on track to surpass $1 billion in revenue this year, has 48 million daily active users and 11 million paying subscribers. Though the company doesn’t reveal user numbers for the free chess course, at the Fast Company Innovation Festival in Septembe

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