Event: Doncaster League

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Opponent Rating Result
Zak Tomlinson 1781 0 - 1
Richard E Desmedt 1800 0 - 1
Shay Topping 1630 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1604 = (5211 + 400 * (1 - 2)) / 3)

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