The 37-year-old came up with a sedate one-under 71 in the final round to edge out defending champion Anirban Lahiri (69) and Korea's Jeunghun Wang (68). The victory also secured his European Tour card.
The Kolkata Pro said: "This is very important as I don't have a full card. Hopefully I am playing Olympics and World Cup and so it is important. I am happy. I was nervous a bit but I focussed and breathed in and out and controlled my nerves."
It was Lahiri, who made a rampaging start to the final round as he blasted a hat-trick of birdies in the first three holes and caught up with Chawrasia when the Kolkata pro dropped a shot at the sixth hole.
Chawrasia, however, picked a stroke at the eighth and Lahiri dropped one at the ninth to be two strokes behind the overnight leader.
At the 14th hole, Lahiri gained another stroke and joined Wang after both his and Chawrasia's tee shot ended up in a bunker. While Lahiri managed to hit a birdie, Chawrasia saved par.
At the 17th, Wang was left cursing his luck when his birdie putt flipped out, while Chawrasia and Lahiri once again saved par.
Wang came up with a wayward second shot at the 18th but it kicked off from the trees into the fairways. However, he could not make use of it, missing a birdie putt to stay at 13-under.
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