Event: Doncaster Bell Trophy

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Opponent Rating Result
Ian Farrow 107 1 - 0
David P Hatfield 1467 0 - 1
Ian Farrow 107 0 - 1
David P Hatfield 1467 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

587 = (3148 + 400 * (1 - 3)) / 4)

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