Event: Challengers - U1900

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Opponent	Rating	Result
Paul Mottram	1747	0 - 1
Rob Mitchell	1729	1 - 0
Ben W Vaughan	1631	1 - 0

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

1836 = (5107 + 400 * (2 - 1)) / 3)