The result sees East Bengal climb to third in the standings with 14 points from seven matches, while Chennaiyin FC remain 12th with five points.
Notably, all four goals in the contest were scored by Indian players. Bipin Singh was adjudged the Player of the Match for his decisive contribution.
East Bengal made a confident start and took the lead in the seventh minute through a well-worked move.
Captain Saul Crespo threaded a precise through ball into the path of Edmund Lalrindika, who showed composure to control and slot a right-footed finish past Mohammad Nawaz to make it 1-0. Chennaiyin gradually grew into the contest and came close to equalising in the 20th minute when Irfan Yadwad's header struck the post following a cross from Farukh Choudhary. The hosts continued to push forward and were rewarded in the 28th minute.
Laldinliana delivered a perfectly weighted ball and Irfan timed his run to perfection before delicately chipping the ball over East Bengal keeper Prabhsukhan Gill to level the score at 1-1.
The second half began with Chennaiyin applying sustained pressure, with Alberto Noguera, Farukh Choudhary and Irfan Yadwad all going close, but failing to find the target.
East Bengal responded through Vishnu and Mohammed Rashid, though Nawaz remained alert in goal, producing a series of important saves, including a double stop to deny Vishnu and Youssef Ezzejjari.
As the match entered its final phase, East Bengal found the breakthrough in the 83nd minute.
A well-delivered cross from Vishnu on the left flank found Bipin Singh inside the box, and the winger comfortably headed the ball into the net, restoring the lead at 2-1.
East Bengal sealed the victory deep into stoppage time with a swift counterattack. Miguel Figueira carried the ball forward from his own half before setting up Nandha Kumar, who calmly slotted his finish into the near post to make it 3-1 in the 90+6 minute.
The final whistle confirmed a crucial away win for East Bengal FC, as they strengthened their position in the title race with a clinical performance in Chennai.

Kerala Blasters rally to beat 10-man Bengaluru

A spirited second-half comeback saw Kerala Blasters FC secure their first victory of Indian Super League 2025-26 season with a 2-1 win against 10-man Bengaluru FC at the Sree Kanteerava Stadium on Saturday.
After an own goal from Fallou Ndiaye handed Bengaluru the lead, Víctor Bertomeu restored parity before substitute Francisco Feuillassier struck the decisive winner.
The breakthrough arrived in the 28th minute through an unfortunate moment for the visitors. Ryan Williams burst past his marker and delivered a dangerous ball into the centre, where Fallou, attempting to intervene ahead of Sunil Chhetri, inadvertently diverted it into his own net to give Bengaluru the lead.
The match took a dramatic turn in the 34th minute when Braian Sánchez was shown a straight red card for violent conduct following an altercation with Matías Hernández, reducing the hosts to ten men.
The Tuskers, however, began to assert control and were rewarded in the 60th minute. Ebindas threaded a precise through ball to Bertomeu, who showed composure to guide a right-footed finish into the bottom-right corner, bringing the visitors level.
With momentum on their side, the Blasters continued to press, and their persistence paid off in the 78th minute. Substitute Feuillassier marked his ISL debut in style, latching onto another incisive pass from Ebindas before weaving past his marker and finishing from a tight angle through Gurpreet's legs to put Kerala ahead 2-1.
The result lifts Kerala to 13th in the standings, while Bengaluru remain fifth points. (PTI)