Event: SCCA Division 3

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Opponent	Rating	Result
Simon Webber	1608	0 - 1
Bernard Ross	1242	1 - 0
Philip J Chapman	1263	0 - 1

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

1238 = (4113 + 400 * (1 - 2)) / 3)