The 52-year-old former world champion now shares the lead with Magnus Carlson 8.5 marks each.
The regular classical game between Anand and So ended in a draw for 28 moves. The American then defeated the Indian GM in 46 moves through the game of Armageddon.
Indian ace won over France Maxim Vachier-Lagrave, Vaseline Topalov of Bulgaria and China hao wango In the first three rounds.
Meanwhile, Carlsen beat Dutchman Anish Giri in the classical game to collect three points and take the lead with Anand.
Azerbaijan’s Shakhriyari in another decider in the fourth round mamedyarov defeated Hao Wang while Taimur Radjavovi And the experienced Topalov used Vachier-Lagrave and . won through Armageddon against Aryan Tariq (Norway) respectively.
In the ongoing Norwegian chess tournament, players participate in Armageddon (sudden death) in case of a draw in the classical game.
he had won the Blitz The event before the classical program.