Rohana (67-64-67), the halfway leader by three shots, enjoyed a steady front-nine where he managed one birdie and eight pars to maintain a safe distance between himself and his nearest challengers Aadil Bedi, Mukesh Kumar and Rashid Khan.
Rohana, who won the last of his five titles on the PGTI exactly a year back in Jamshedpur, had a contrasting back-nine thanks to a hot putter that helped him build on his lead.
He drained birdie putts from a range of seven to 15 feet on the 11th, 13th and 18th. Rohana also landed his tee shot within three feet on the par-3 15th to set up another birdie.
Chouhan (68-68-67) was even-par for the day till the fourth hole but he picked up the pace with five birdies between the fifth and the 11th to end up with a 67. He thus gained four places from his overnight tied sixth position.
Two-time Asian Tour winner Rashid gained one spot from his overnight tied third after a round of 68. Rashid was even-par for the day through the front-nine but he made a charge with four birdies on the back-nine.
C Muniyappa was the highest-placed Bengalurean in sixth place at 11-under-205. Muniyappa was six-under for the day till the 17th hole but conceded a double-bogey on the last hole to close the round with a 68.
Reigning champion Udayan Mane (69) of Ahmedabad was a further shot back in tied seventh along with Bengaluru's M Dharma and Kolkata's Divyanshu Bajaj, both of whom carded the day's best 66, and Patna's Aman Raj (71).
Bengaluru's Aryan Roopa Anand, the only amateur to make the cut, came up with a 72 in round three to be placed tied 39th at one-over-217.
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