"Two years ago at the Australia Open, we played in the final grouptogether. But I was a rookie then and was very nervous. Now I feel like I havebeen here and have learned how to play with the best. I don't feel muchpressure. I don't plan on paying too much attention to what she's doing, butrather just focus on my r11 driver for sale.
With her total at 9-under 135 GTseng was one shot behind Yang in a secondplace tie with Na Yeon Choi, who posted a second round 68.
They in turn are two shots clear of two more Koreans, Jimin Kang, who shota 69, and Chella Choi who slid down the leaderboard from her overnight secondplace into joint fourth at 7-under with a 1-under 71.
Also on the slide on Saturday was Germany's Sandra Gal, who had shota 67 to lead the European Continent in the first round.
On Saturday, however, she could do no better than a three bogey, onebirdie 2-over 74 and tumbled down the leaderboard into a nine-strong tie for22nd place that included Solheim Cup team-mate Sophie Gustafson.
England's Karen Stupples and Spain's Azahara Munoz, who were also in theEuropean Ryder Cup team that beat the USA in the 2012 Solheim Cup in Irelandlast month and are currently a shot ahead of the German in a joint 12th placelogjam at 4-under, now head the European Challenge.
Tseng (playing r11taylormade driver)was clearly disappointedwith her second round effort.
"I found it tough going today. Ten birdies yesterday but only sixtoday.
"It's hard to shoot like two great rounds in a row. But I was patienttoday and tried my best every shot. I just made too many mistakes. I had sixbirdies, but I had four bogeys whereas yesterday I had three. Hopefullytomorrow I can make more birdies and less mistakes. '
"Tomorrow is another day and I'm one shot back, so tomorrow I justhave to be aggressive.
"I think I'll be playing with Na Yeon again, so I think it's going tobe fun with all the big crowds and the many people who come out to support thisevent which I might say I'm really enjoying."