Event: Div 2 - Weston Trophy

Opponent Rating Result
Kevin R Marshall 1785 0 - 1
Steve Withington 1717 0 - 1
Hashim Tuffaha 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

767 = (3502 + 400 * (0 - 3)) / 3)

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