Chawrasia and Pepperell were one-under, while Pigem was four-under through 11 holes to take their total to six-under at the Gary Player designed course here.
The 38-year-old from Kolkata was leading by one stroke after the unfinished second round yesterday, while Pepperell (69,70) and Malaysia's Danny Chia (70,69) also had joined him at the top after completing their second round this morning.
"I stuck to the same game plan that I have had for the first two rounds. I just want to hit straight, keep the ball in play and keep giving myself chances all the time," he said.
"I am happy that I managed to do that, despite the bogey I dropped. On this course, a few misses (on the green) are bound to happen, but one cannot think about them.
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Pepperell bogeyed the sixth hole but held a one-under score at the turn after making a birdie-birdie finish.
Pigem picked up five birdies - four in the front nine and one in the 11th hole against a bogey at the sixth hole.
"I'm really happy about my round. I started strong with two birdies. I made one mistake with a bogey, then got another few more birdies. So if I can keep playing really good, let's see what can happen tomorrow," he said.
Malaysia's Gavin Green fired the best card of the day, sensational a six-under 66 to be one stroke behind the leaders, while Northern Irish golfer Michael Hoey and England's David Horsey shared the fifth spot after being two-under and par after 12 and 11 holes.
Among other Indians, 2015 Champion Anirban Lahiri was three-under at 16th hole to be tied 19th before play was suspended due to darkness, while Chiragh Kumar and Subhankar Sharma brought home a matching 71 to share the 23rd spot.
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