Event: Doncaster League

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Opponent Rating Result
Peter JE Ackley 2156 ½ - ½
Zak Tomlinson 1778 1 - 0
Peter JE Ackley 2084 0 - 1
Paul Shaw 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1605 = (6018 + 400 * (2 - 1)) / 4)

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