Event: Open Championship

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Opponent	Rating	Result
Paul DJ Hampton	193	0 - 1
Jonathan WR Underwood	183	½ - ½
Paul DJ Hampton	193	½ - ½
Jonathan WR Underwood	183	½ - ½

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

88 = (752 + 400 * (0 - 1)) / 4)