Event: Division 2

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Opponent	Rating	Result
Andy Medcalf	1515	1 - 0
Ric Woodcock	1458	1 - 0
Ian Craig	1431	½ - ½
Sri Sriharan	1426	1 - 0
Ric Woodcock	1466	1 - 0
Ian Craig	1416	0 - 1
Aart Gehrels	1085	1 - 0
Leslie F Bresnen	1500	1 - 0
Sri Sriharan	1426	1 - 0

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

1680 = (12723 + 400 * (7 - 1)) / 9)