Sankalan, playing black, opted for his favourite Sicilian Dragon and broke open the queenside of his illustrious opponent.
Unable to defend against the onslaught of the combined forces of Sankalan, Das resigned on the 26th move.
IM Swayams Mishra, also from Odisha, won a minor piece ending against Akash Tiwari in a Queen's Indian defence while Prantik Roy had to sweat it out against Vishal Didwania before winning a pawn in the ending where he had a knight against a bishop.
In other important results, Mitrabha Guha beat Sohini Ganguly, Deborshi Mukherjee beat Yudhajeet De, Chandreyee Hajra beat Sayan Bose and Arpita Mukherjee beat Sayantan Mukherjee.
Also Read
In the U-10 girls' section, Sinthia Sarkar won her second game on the trot by beating Ashpriha Das while Souhardo Basak took his tally to two points by getting the better of Devansh Roy Choudhury in the U-10 boys section.
In the U-16 section, second seed Ayushman Majumdar went down to Disha Mundhra while top seed Rounak Pathak and fourth seed Basant Das had little difficulty in winning their respective games.