Event: Division One

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Opponent Rating Result
John Cox 225 ½ - ½
Michael W Healey 212 1 - 0
Michael W Healey 217 ½ - ½
Richard Britton 198 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

413 = (852 + 400 * (2 - 0)) / 4)

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