Calcutta: Unfancied Indradeep Giri caused a major upset in the Premiere section beating third seed National A player Arghyadip Das of Railways on the opening day of Karvy the Interpolis Chess for Youth meet organised by Dibyendu Barua Chess Academy at Netaji Indoor Stadium here on Tuesday.

The top seed, IM Abhijit Gupta of Rajasthan was held by Bengal sub-junior champion Debaditya Sinha Biswas. Debaditya, in fact, was in a clearly better position in the end game but time pressure forced him to settle for a draw.

Former world U-12 champion, Deep Sengupta, too, survived a scare against Debayan Majumder and was lucky to win from an inferior position.

In the U-16 section, all the seeded players won their respective games with ease and have two points to their credit.