Event: Doncaster League

Opponent Rating Result
Sean O McDonald 1908 0 - 1
Zak Tomlinson 1765 ½ - ½
Farrell P Clifford 1792 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1688 = (5465 + 400 * (0 - 1)) / 3)

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