Event: Division One

Opponent Rating Result
Ewan Wilson 2152 ½ - ½
Andrew MJ Robbings 1979 ½ - ½
Ewan Wilson 2174 ½ - ½
Andrew P Smith 2218 0 - 1
John D Wager 2064 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2117 = (10587 + 400 * (1 - 1)) / 5)

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