Event: Div4

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Opponent Rating Result
David Short 102 1 - 0
Harry Madden 113 ½ - ½
Paul Kelman 136 0 - 1
Craig Harrison 111 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

116 = (462 + 400 * (1 - 1)) / 4)

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Opponent Rating Result
Frank K Pearson 111 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-289 = (111 + 400 * (0 - 1)) / 1)