Event: Division 2

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Opponent	Rating	Result
Charles J Richmond	1592	½ - ½
Charles J Richmond	1613	½ - ½
Alan Wadsworth	1693	1 - 0
Sam Inman	1350	1 - 0
David Cattermole	1637	½ - ½
Nathan Weersing	1553	0 - 1
Mark Heffer	1679	½ - ½
Amy John	1574	1 - 0
David Cattermole	1646	½ - ½
Yoav Pilowsky Bankirer	1729	0 - 1
Robert L Jones	1688	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

1650 = (17754 + 400 * (3 - 2)) / 11)