SAINT OMER (France) (AFP) Englishman Robert Dinwiddie took over the lead at the halfway mark of the Saint-Omer Open here on Friday when he struck a blistering six-under-par 65 in the second round. The 27-year-old, top of the Challenge Tour rankings and vying for his European Tour card, produced six birdies in a bogey-free round. He is six-under after two rounds and holds a one-stroke lead over first-round joint-leader Martin Wiegele. Im really happy with a 65, especially as my neck went after my first shot on the range this morning, said Dinwiddie. Its a very difficult track, but I did think the pins were a little easier today though maybe thats just because I was playing better. There were still some very tricky holes out there, so Im delighted to have kept the bogeys off the card today. Wiegele, who carded an opening round 66, had a mixed round with two birdies and two bogeys in his par 71 but he remains firmly in contention. I didnt play much worse than yesterday, said the Austrian. The wind got up pretty early again. So I was pretty pleased with how I played, but disappointed that I made a few mistakes on my back nine, which cost me some shots. Wiegele is one stroke ahead of Englands Jamie Elson and Matt Haines and Dane Mark Haastrup. Irelands Colm Moriarty, who was joint top after the first round, had a disappointing second round, carding a two-over 73 to slide down the leaderboard.