Event: Division 4

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Opponent	Rating	Result
Roger Bray	1520	1 - 0
Peter FK Evans	1400	1 - 0
Michael WA Hoare	1609	0 - 1

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

1643 = (4529 + 400 * (2 - 1)) / 3)