Event: Division 4 - Athenaeum Cup

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Opponent	Rating	Result
Peter T Sharpe	116	1 - 0
John Speck	101	0 - 1
George Peters	137	0 - 1

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

-15 = (354 + 400 * (1 - 2)) / 3)