Nelson hit back for a 3-3 draw in their first Oxford & District Summer League Section 2 clash.
Terry Green put Democrats in front scoring 8,060, including a break of 4,500.
But Nelson bounced back with good wins from Lewis Stratford (6,120) and Sean Stratford (10,740).
Green (7,800) then won his second game to level the scores, before John Patey (7,750) put Demos 3-2 up.
Stratford (8,620) took the final game to seal the draw.
Don Jenkins (6,990) and two wins by Tony Harvey (3,180 and 3,610) helped Corner House B to a 5-1 victory against Dolphin B.
Didcot Con Club kicked off their Section 1 campaign with a 4-2 win at Masons.
Jenny Abbott (4,040), Sue Atkins (2,000) and Dennis Atkins (5,910) and (10,590) put Didcot 4-0 up.
Martyn Wood (8,860) and Alan Lowe (6,230) won took the last two games for Masons.
In Section 3, Gladiators won 5-1 at Marlborough, thanks to victories from Bob Pincombe (2,480 and 2,440), Phil Clark (3,900 and 3,330) and Jenny Webb (2,050).
Bletchingdon thrashed Headington Con B 6-0 with Shaun Brookbanks, Andy Skinner and Pete Soanes all victorious.
RESULTS
Section 1: Masons 2, Didcot Con 4; Dolphin A 4, Corner House A 2.
Section 2: Corner House B 5, Dolphin B 1; Nelson B 3, Democrats 3.
Section 3: HCC B 0, Bletchingdon 6; Marlborough C 1, Gladiators 5.
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