Event: Bottom Half A&B Division

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Opponent	Rating	Result
Peter Townson	1510	1 - 0
Geoff Mann	1467	1 - 0
Kegan Harrison	1696	½ - ½

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

1824 = (4673 + 400 * (2 - 0)) / 3)