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 ...

It was a move that changed everything. Ding Liren, the reigning world chess champion, played his rook to f2—a decision that would not only cost him the game but also his crown. Across the board, the ...