Defending champion Viswanathan Anand will have to fight it out in rapid chess tiebreaker against challenger Boris Gelfand after a tied 6-6 result in the World Chess Championship match on Wednesday.

To start with, there will be four games under rapid chess rules with 25 minutes to each player and a ten seconds increment after every move is made.

In case of a 2-2 result, the two will play two blitz games with five minutes each with a three seconds increment.

There will be five such matches if the tie persists and finally an Armageddon game will be played with five minutes to white and four to black and white will be forced to win should this arise.

The tie-breaker is likely to see a high-tension drama which has been so far amiss from this World Championship, which produced just two decisive games apart from ten draws.

Playing his third match since winning the world title in a tournament format in 2007, this has been the least absorbing contest in World Championship matches for Anand.

On Wednesday the world champion will be known.