Event: Online League Season 2, Division 3

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Opponent	Rating	Result
Robert C Nield	1690	0 - 1
John M Oughton	1153	0 - 1
Steve Withington	0	0 - 1
Daniel Crampton	1218	1 - 0
Dudley G Thorpe	0	0 - 1
Howard Cooper	1232	½ - ½
Rosie Irwin	0	1 - 0
Xiaorui Wang	1263	0 - 1

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

670 = (6556 + 400 * (2 - 5)) / 8)