India's International Master B S Shivananda created a major upset when he defeated Grand Master Gagunashvili Merab, the fourth seed, in the 6th Mumbai Mayor International Chess Tournament here.
However, Shivananda's compatriot - IM Aditya Udeshi - muffed a golden chance to stun the tournament second seed, GM Amonatov Farrukh, despite having two extra pawns than his rival in the end game and settled for a draw.
At the end of the fourth round, GM Babujian Levon (ELO 2488) of Armenia and GM Pantsulaia Levan (ELO 2563) of Georgia held the joint lead with 4 points each at the National Sports Club of India.
GM Levon upset his countryman and 3rd seed, GM Andriasian Zaven (ELO 2608), in 50 moves.
The game of English opening between top seeded GM Mchedlishvili Mikheil (ELO 2645) of Georgia and GM Papin Vasily (ELO 2552) of Russia ended in a quick draw after 12 moves.
GM Levan opted for Reti opening against IM Rahul Sangma (ELO 2382) of Railways. On the 20th move Rahul exchanged his Queen and opted for equal end game. But on the 22nd move Levan forced him to give his Rook for the Knight and won the game in 42 moves.
The results: GM Mchedlishvili Mikheil (3.5) drew with GM Papin Vasily (3.5); GM Andriasian Zaven (3) lost to GM Babujian Levon (4); GM Pantsulaia Levan (4) bt IM Rahul Sangma (3); GM Petrosian Davit G (3.5) drew with GM Amonatov Farrukh (3); M Ankit R Rajpara (3) drew with GM Zubarev Alexander (3); GM Malakhatko Vadim (3) drew with IM Aditya Udeshi (3); GM Hossain Enamul 2487 (3) drew with IM Himanshu Sharma (3); IM Thejkumar M S (2.5) lost to IM Karthikeyan Murali (3.5); GM Laxman R R (2.5) lost to IM Rajesh V A (3.5); IM Shivananda B S (2.5) lost to GM Yagupov Igor 2428 (3.5).
