Both players carded 69s at the Kelso course, with McNicoll, second in the Scottish Alliance Championship at Monifieth and Arbroath, coming out on top in a countback that went down to the final three holes.
Challenge Tour player Jamie McLeary finished a shot behind the pair in the scratch section in an event dominated by the professionals. In a field of 88, the handicap section was topped by Falkirk Tryst’s Daniel Airens with a net 72 playing off nine.
He was closely followed by Kingsknowe’s Alan MacKay, who had a 73 off three, with Liberton’s Steven Doyle next on 74 off six. The senior spoils went to Duddingston’s Iain Stavert with a net 77 off four.
After four events in the Order of Merits, Ratho Park’s Andrew Erskine leads the scratch event with 220 points, just ahead of Craig Imlah (Peebles) and Gordon Law (Uphall) on 200.5.
Archerfield’s Darren Love tops the handicap table on 64.5 points, followed by Airens on 50 and MacKay on 49.