Event: Division 4 - Under 6000

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Opponent	Rating	Result
Simon Howard	1349	1 - 0
Ben Darlington	1400	½ - ½
Ellis Manning	1585	0 - 1
Ben Wotton	1407	1 - 0
Ben Wotton	1407	0 - 1

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

1430 = (7148 + 400 * (2 - 2)) / 5)