A tense battle with Malaysia's hope, International Master Mas Hafizulhelmi where for a long time he was starring at his first loss still ultimately ended with Jahongir Vakhidov emerging the winner in a time scramble winner and stay perfect after four rounds of play.
The young Uzbekistan player remains the tournament leader but top seeded Filipino International Master Oliver Barbosa is just half a point behind with 3.5 points after beating Singaporean Grandmaster Wong Meng Kong who remains on 0.5/4.
Another half a point behind on three points is another Filipino, International Master Richard Bitoon after he had a determined win over Vietnamese International Master Nguyen Van Huy who with just 1.5 points will now have to do something special to get himself back into contention.
Following him is the only other unbeaten player, Grandmaster Tahir Vakhidov who has won one and drawn three of his four games including his encounter with Singaporean International Master Goh Wei Ming who has 1.5 points and a mountain to climb, and the Indian International Master Arghyadip Das, who joins him on 2.5/4.
Das who is still very much in contention for the Grandmaster norm had a short draw with out of form but steadily improving veteran Vietnamese Grandmaster Nguyen Anh Dung who had earlier suffered three successive losses.
