STS-134 astronauts Greg Johnson and Greg Chamitoff ponder their next move for the Earth vs. Space chess match. The shuttle crew members also discuss their activities aboard the International Space Station and the benefits of playing chess. Participate in the match at uschess.org/nasa2011. You can also follow the contest via twitter, @Astro_Taz - Astronaut Greg Chamitoff and @ChessMagnet - Match Director Hal Bogner. Or stay posted on facebook at the Earth vs. Space Chess Match 2011 page and NASA's International Space Station page.