Event: Open Championship

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Opponent	Rating	Result
Steve K Dean	155	½ - ½
Paul DJ Hampton	193	1 - 0
Steve K Dean	155	½ - ½
Paul DJ Hampton	193	½ - ½

performance = (sum(opponents ratings) + 400(wins-losses)) / games

274 = (696 + 400 * (1 - 0)) / 4)