D.A. Points fired a 6-under 66 on Saturday to join Allen, who posted a 3-under 69, in first at 16-under-par 272 after four rounds of this six-round marathon.
Nicolas Thompson and Scott Hend each fired the low round of the day on Saturday. At the Panther Lake Course, Thompson and Hend both shot 8-under- par 64s and share fifth place at 14-under-par 274.
The event is being played on the Panther Lake and Crooked Cat Courses at Orange County National Golf Center & Lodge. The low 30 scores and ties will earn PGA Tour cards for 2006. The next 51 finishers will earn fully exempt Nationwide Tour cards for 2006 and the remainder of the field will receive conditional Nationwide Tour status.
Allen, who has had sole possession of the lead after each of the first three rounds, struggled early at the Panther Course as he was 1 over par through six holes. He atoned for the mistake with back-to-back birdies from the seventh, but dropped a shot at No. 9 to make the turn at even-par 36.
Allen traded a birdie and a bogey at 11 and 13. He closed with three birdies in a row from 16 to leap back into familiar territory.
'It was an emotional roller-coaster all day long,' admitted Allen. 'I did not play well at all for most of the day, but I was able to get it together at the end. Finishing with three birdies definitely puts a good taste in my mouth after what had been a very difficult day.'
Points, who recorded the longest drive on tour this season with a 442-yard bomb, mixed three birdies and a bogey over his front nine. He collected two birdies in a row at the start of his back nine to get to 14 under par for the tournament.
At the 14th, Points drained a 20-footer for birdie to grab a share of the lead at minus-15. Points, who played in a threesome with Allen on Saturday, birdied the par-5 closing hole at Panther Lake to put himself in great position to return to the PGA Tour in 2006.
'There is still a lot of work left to do, but I'll take two more 66s and see you on Monday,' said Points. 'I certainly wouldn't say I was making everything, but I'm making my share.'
B.J. Staten shot a 7-under 65 and is alone in seventh place at 13-under-par 275. Bill Glasson (68) and Robert Garrigus (67) are knotted in eighth at minus-12.
Mathias Gronberg (69), Nick Watney (68), Alex Cejka (70), Peter Tomasulo (68), Ron Whittaker (66) and Henrik Bjornstad (68) are tied for 10th place at 11-under-par 277.