Event: Division 4

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Opponent	Rating	Result
Jonah Tomsett	1566	0 - 1
John Pocock	1482	½ - ½
Sam Clayton	1630	½ - ½

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

1426 = (4678 + 400 * (0 - 1)) / 3)