Event: Division 2

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Opponent	Rating	Result
Tom Rosenberg	1829	0 - 1
Oliver Thornley	1799	0 - 1
Adam Langford	1517	½ - ½

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

1448 = (5145 + 400 * (0 - 2)) / 3)