Mumbai, June 21 -- Candidate Master Madhesh Kumar toppled experienced Georgian GM Sanikidze Tornidze to pull off the upset of the fourth round in the Aurionpro International Grandmaster and Junior Chess Tournament. Madhesh also continued his fine run in the junior event to remain unbeaten after four rounds and lead the standings. In the Grandmaster section, GM Manuel Petrosyan clinically beat Alexei Fedorov, while GM Aleksej Aleksandrov held top seed Levan Pantsulaia. Young Advik Amit Agrawal impressed by drawing IM Alexander Slizhevsky. After four rounds, eight players are on 4/4. Top seed Aansh Nandan Nerurkar also stayed perfect in the junior event with a win over Vyom Malhotra, while Madhvendra Pratap Sharma edged Andalamala Hemal Varshan. Sahajveer Singh Maras (Elo 1849) drew with Advik Agrawal (2218) while Sravyasree Bheemarasetty (1747) held Avirat Chauhan (2168)....