Event: Division One

Opponent Rating Result
John Mildenhall 151 ½ - ½
David Dunn 169 0 - 1
David R Thomas 148 0 - 1
John Green 119 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-53 = (587 + 400 * (0 - 2)) / 4)

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