The Styal player, who has all but cemented his place in the GB & Ireland Walker Cup side to face the United States at Royal County Down in September, was one up with two holes left.
But Shufflebotham, a semi-finalist in the Welsh amateur championship in 2006, rolled in a 15-footer for a birdie-three to square the match.
He then trundled home a 30-footer for a birdie-three at 17 to go one-up before Horsey drove into the bunker at 18.
He was on the green in three after hacking out but Shufflebotham added insult to injury by holing his putt from 15 feet for a third birdie on the spin.
NICK Dougherty, seventh in last week's US Open, continued his fine form with an opening four-under-par 68 in the BMW International in Munich. The 25-year-old Shaw Hill pro is three shots behind Frenchman Raphael Jacquelin after four birdies in the inward stretch.
HAIGH Hall teaching professional Craig Corrigan birdied the last three holes on his way to winning his first Exel Tour event at Hesketh with a six-under-par 66.
ENGLAND'S Rebecca Hudson has a one-shot lead after the first round of the Vediorbis Open.
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