On a day of upsets, Indian Grandmaster Vishnu Prasanna defeated highly regarded Grandmaster Emil Sutovsky of Israel while former world junior girls' champion Soumya Swaminathan came with an inspired performance to beat American Kayden Troff to maintain a clean slate after two games.
Also ending on a high was Indian GM M R Venkatesh who scored a fine victory over Simen Agdestein of Norway.
Quinten Ducarmon of Holland had an extra pawn in the endgame arising out of a French defense but Harikrishna used his Bishop pair well to catch the Dutchman off-guard and won in 52 moves.
The day however belonged to Debashis Das. It was a Nimzo Indian Classical in which Topalov tried a lot of tricks in the middle game. Starting with a piece sacrifice on the 25th move the Bulgarian ripped apart white's position on the king side but Das came up with some remarkable counter play to keep himself in the game.