Chawrasia had rounds of 71-69-72 and 67 for a total of five-under 279.
Today, Chawrasia had two birdies and two bogeys on the front nine and then proceeded to get birdies on 11th, 13th, 14th and 18th on the back nine for a fine finish.
S Chikkaranagappa had even better finish with a 66, but with rounds of 67-73-76 on first three days he finished tied- 30th at two-under 282.
Japan's Daisuke Kataoka birdied three of his last five holes for a closing one-under-par 70 to win his first Asian Tour title by two shots.
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Kataoka, who started the round one shot back, held his nerve to defeat his playing partners and overnight leaders Poom Sakansin of Thailand and countryman Tadahiro Takayama with a winning total of 12-under-par 272 at the Caledonian Golf Club.
Poom moved four shots clear after sinking two birdies in his opening eight holes but a costly triple-bogey on the ninth saw his lead reduced to one.
Poom settled for a share of second place with Takayama, who also returned with a 73 in the USD 1.37 million event.
Korean duo K T Kim, Younghan Song and Japan's Shugo Imahira shared fourth place on 275 following respective rounds of 66, 68 and 70 at the event co-sanctioned by the Asian Tour and the Japan Golf Tour Organisation (JGTO).
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