Prime Minister Manmohan Singh on Monday congratulated Viswanathan Anand for winning the World Chess Championship.
Anand regained the title after a gap of nearly seven years, drawing his 14th and final round game against Hungarian Peter Leko in Mexico City on Saturday.
The 'Tiger from Madras', as he is fondly called, also became the first undisputed World Chess Champion since 1993 as this world championship was the culmination of the reunification of the chess world.
Besides, Anand will keep his number one ranking in ELO ratings due to be released on October 1.
After regaining the crown he last won in Tehran (2000), Anand said, "Being the undisputed world champion is a relief. Since, last year the feud was resolved in chess and we instituted a unified chess title, I am the absolute world champion."