Charl Schwartzel increased his lead to four strokes at the Thailand Golf Championship with a second straight 7-under 65 on Friday.Schwartzel was at 14-under 130 after the second round at the Amata Spring Country Club, where play was delayed due to bad light. Daniel Chopra moved into second place (67), one stroke ahead of Masanori Kobayashi (67)."I seem to play better on courses which are narrower," said Schwartzel, the 2011 Masters champion. "I concentrate better and better and I'm just hitting pretty good off the tee and giving myself good chances."I've put two great rounds together. I hit the ball really nice and gave myself a lot of chances."Chopra took over second place with a second straight 67."I wasn't quite sure how my body was going to react with the jet lag and all that, but I woke up just before my alarm and came out here and warmed up in the dark and off I went," Chopra said. "I birdied the first hole and it was easy after that."Japanese star Ryo Ishikawa (66) moved up the leaderboard into fourth, two strokes ahead of 2012 Masters champion Bubba Watson (70), Sergio Garcia (69) and Scott Hend (68).