After defeating the Norwegian superstar in the first blitz event in the classical division, Anand claimed victory in the thrilling Armageddon (the game of sudden death), when the regular match ended in a 40-run draw.
At Armageddon, 52-year-old Anand recreated old magic by stunning Carlson by winning 50 moves.
With 10 points in his kitty, Indian GM is on the field with four more rounds to go to the prestigious tournament, which has some of the best players in the game.
Anand started with three wins in a row in the classical event, finishing fourth in the fourth round by defeating Wesley Gold of the United States, Maxim Vachier-Lagrave (France), Veselin Topalov (Bulgaria) and Hao Wang (China).
Despite losing to a longtime rival, Carlson is in second place with 9.5 points.
Wesley So, who had previously won the blitz class, finished third along with Shakhariyar Mamedyarov (Azerbaijan) with 8.5 points.
In the fifth round, then went to Mamedyarov via Armageddon.
In the fifth round, Anish Giri (Netherlands) and Aryan Tari of Norway defeated Timor Radzabov (Azerbaijan) and Wang Hao, respectively.
Frenchman Maxim Vachier-Lagrave improved his score to 7 by winning the Sudden Death Game against veteran Vaseline Topalov (Bulgaria) in the second match.
In the current Norwegian chess tournament, players participate in Armageddon (sudden death) if they draw in the classical game.
