Event: SCCU County Championship: U1850

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Opponent	Rating	Result
Laurie Mackellar	1700	0 - 1
David J Gilbert	1607	0 - 1
Conrad Hall	1564	1 - 0

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

1490 = (4871 + 400 * (1 - 2)) / 3)