Oscar is here to check your chess skills in the newest Duolingo course since the app began offering math and music lessons. "Hola, ajedrez" means "Hello, chess" in Spanish. You've always been able to ...

The following content is brought to you by Mashable partners. If you buy a product featured here, we may earn an affiliate commission or other compensation. Get schooled by real grandmasters. Credit: ...

In Dan Starbuck Pelletier’s program, the only kings and pawns in the room move on a black-and-white checkerboard. The playing field that exists outside the room is leveled to make way for the world’s ...