India's chess champion Viswanathan Anand has successfully retained his world No. 1 title by winning the fourth game of his rapid chess tie-breaker against challenger Boris Gelfand in the World Chess Championship on Wednesday. This is Anand's fifth world title. Anand led 2-1 going into the fourth game of the tie-breaker, which was set up after a tied 6-6 result with his Israeli challenger Boris in the 12th and final game in Moscow on Monday, and finished the fourth game 2.5 to 1.5. Anand, playing his third match since winning the world title in a tournament format in 2007, won the second game and drew the first and third to move close to the title. Gelfand tried hard in the fourth game, and had several chances to press home the advantage, but failed in his bid as Anand defended well.