Event: Hepolite (Rapid Play)

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Opponent Rating Result
Ian Jewsbury 135 ½ - ½
Ian Jewsbury 135 1 - 0
Peter Shaw 207 0 - 1
Ihor Lewyk 203 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

70 = (680 + 400 * (1 - 2)) / 4)

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