Event: C Division

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Opponent	Rating	Result
Stephen Ollis	1533	0 - 1
Ashton Woodward	1385	0 - 1
John Halliday	1150	1 - 0

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

1223 = (4068 + 400 * (1 - 2)) / 3)