Brooklyn chess teacher Boris Izrayelit, 33, had to keep his eyes on two games at once at the World Chess Championship on Friday.

World champion Magnus Carlsen of Norway and challenger Sergey Karjakin of Russia were playing the sixth game of the match in the Fulton Market Building in lower Manhattan. In an adjoining room, Izrayelit watched them on video screens while next to him, two of his students, Nura, 10, and Vincenzo, 9, were playing a game of their own.