In a match full of drama at the Kanchenjungha Stadium, East Bengal trailed twice to be 0-2 and 2-3 against the qualifiers Kalighat MS, but Edeh Chidi and youngster Manandeep Singh rose to the occasion with a brace each.
Luck also favoured the red-and-golds as Sporting Clube de Goa lost 1-2 to ONGC in another must-win match at the SSB ground to ensure East Bengal's smooth passage to the semis.
Playing without their star central defender Uga Okpara, East Bengal conceded early goals as James Giblee (11th) and Tanmoy Kundu scored in a space of five minutes.
East Bengal, however, kept attacking and got their first goal in the 30th minute when Manandeep, scored from an Orji Penn cross.
Manandeep was once again in his elements to bring on the 2-2 equaliser when he scored this time from a Chidi cross.
But their joy was short-lived as Nigerian Christopher Chizoba helped Kalighat restore the lead in the 40th minute.
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There was more drama in store as East Bengal made it 3-3 at the interval after Chidi was fouled inside the KMS box.
The Nigerian converted the spot kick to add more spice as the match poised for an entertaining second-half.
In an action replay, Chidi was again fouled inside KMS box and the result was no different as he fired in the winner from the spot, for a superb East Bengal turnaround. MORE