Chennai: Of all the five world titles he has won so far, Indian chess wizard Viswanathan Anand has rated the most latest one as the toughest in terms of intensity.
Anand has been the undisputed world champion since 2007 and he is back in the country after defending his fifth world title, against challenger Boris Gelfand of Israel.
"When you finish an event progressive, it is the toughest ever. It was certainly the longest world championship as such. If you see earlier matches, I finished in game 11 and game 12 but this one went to the tie breaker. I think in terms of intensity this was the toughest," Anand said in an interview.