English pair Nick Dougherty and David Howell share the lead on 12 under at the halfway stage of the HSBC Champions tournament in Shanghai.
GB & Ire unless stated
-12 D Howell, N Dougherty
-10 N O'Hern (Aus), T Woods (US)
-9 K Ferrie, P Casey, T Wiratchant (Thai), Z Lian-wei (Chn), RJ Derksen (Ned)
-5 L Westwood, Pa Lawrie
-4 J Bickerton
-3 P Harrington
+1C Montgomerie, P Broadhurst
In miserable wet and misty conditions, Howell fired a second round 67 while Dougherty added a 68 to his opening 64.
World number one Tiger Woods is two shots back after carding five birdies and two bogeys in his round of 69.
Howell, whose score was the joint lowest of the day, said: "I'm really pleased to get round without a bogey."
The Swindon golfer added: "We could just do with some nice weather and everything would be great."
Dougherty, from Liverpool, admitted he played "nowhere near as well" as for his 64 and added: "It means a lot to stay tied for the lead.
"It's a really tough course when the wind blows and we had rain as well. It was fairly defenceless yesterday, but today you had to be smart."
Woods, who mixed 10 birdies with three bogeys in his first day 65, suffered another eventful day, typified by a dramatic closing par five.
He hit his second shot into the lake but made a 20-foot putt - after the ball hung on the lip before dropping just like his dramatic chip at the Masters in April.
"I am a little bit frustrated. I didn't really get going today," said the American.
"But for that last putt I would have been two over for the last three holes and that would have left a bad taste in my mouth."
Another Englishman, Kenneth Ferrie, dominated the early stages of the day's play, following a hat-trick of birdies from the second with a hole-in-one at the 209-yard sixth.
The Northumberland golfer turned in 31 but then came home in 38, dropping a shot at each of the last two holes while playing partner Paul Casey birdied both to join him on the nine under par mark. They are in a tie for fifth.
Ferrie said: "I would have taken this position before I started out yesterday, but I definitely wouldn't have taken it after nine holes today.
"A round of golf involves playing 18 holes, so no matter what I did earlier it wasn't an impressive finish."
Ian Poulter, showing off a range of colourful embroidered silk trousers this week, is eight under after a 69.
"I should be leading comfortably - I missed a shed-load (of putts) coming in," he said.
"But the greens are not that clever. Once you turn they're smelly with all the traffic that's been on them and you're not going to hole many."
Colin Montgomerie came off second best to playing partner Woods for the second day running and is 13 shots behind.
Going out in 32 raised the eight-time European number one's spirits after an opening 74.
But he came home in 39, bogeying the 15th and finishing with a double bogey seven after also visiting the water.