By virtue of the win, the Royals shot up to the second spot in the standings and are currently at 20 points from 11 games, while East Bengal continued to be in the sixth spot with 13 points.
It was Godwin Franco who scored the decider for the hosts at the stroke of half hour. It was Franco's first goal in RWFC colours.
It could have been a 2-0 win for the hosts, but a Jackichand Singh goal towards the fag end of the first half was called offside.
Coach Santosh Kashyap was delighted with the win over the Kolkatans and stated his side was a serious contender for the title this season.
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In the 12th minute Kim Yong had a chance to put the Royals ahead after being fed beautifully by Densill with a lofted pass. However, an advancing Subhashish Roy Chowdhury forced Kim to chip it over just wide of the nets on the left.
A corner on the half-hour mark finally gave the home side lead. Assigned with the kick, Jackichand Singh opted to pick out a lurking Godwin Franco outside the box, who let loose a right-footer to beat Mondal all ends out and gave the hosts the lead.
Towards the end of the first half, Jackichand smashed one into the back of the net from inside the box sending the crowd into raptures. Unfortunately for the Royals, he was given offside by the linesman.
Prem Kumar Singh was specially brilliant in front of the nets. The RWFC goalie made an excellent save to block an on-target Ranti Martins shot.
The Royals would take on Bengaluru FC in an away match on April 3.