Calum Hill dropped into a share of the lead with Robert MacIntyre and Richard Bland by bogeying the last hole in his second round at the British Masters.
Hill held a one-shot advantage when he teed off at the 18th at The Belfry on Thursday, but moved to back seven under in a disappointing finish.
The 26-year-old Kirkcaldy native was a shot back from overnight leader Matthias Schwab at the start of the day and a two-under 70 kept him firmly in the mix.
Hill birdied the third and chipped in from thick greenside rough to go seven under at the fourth, going out in 35 after a first bogey of the day at the par-four eighth.
Back-to-back gains followed straight after the turn, but he was unable to stay out on his own, bogeying the final hole after reeling off six consecutive pars.
MacIntyre made his move with a brilliant six-under 66, starting with five birdies in a row and picking up another three shots on the back nine after bogeys at the sixth and 12th.
The left-hander, tied for 12th in The Masters last month, had started the tournament with a 71, but surged up the leaderboard with a magnificent second round.
Bland backed up his opening 68 with a three-under 69 and the Englishman is bogey-free through his opening two rounds.
Frenchman Julien Guerrier signed for a sublime 66 to stand well poised just a shot off the leading trio along with Justin Harding and Eddie Pepperell.