MARY LOUISE KELLY, HOST: Basketball's March Madness may have just started, but the country's reigning college chess champions are preparing for their own final four. That's Saturday. The Texas Newsroom's Ana Campbell takes us to the U.S.-Mexico border. UNIDENTIFIED PERSON #1: (Laughter) UNIDENTIFIED PERSON #2: Good game. Good game, guys. ANA CAMPBELL, BYLINE: About 600 million people play chess around the world, but only 2,000 can call themselves grandmasters.