Event: Watkinsons League

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Opponent Rating Result
Andrew Batley 1576 0 - 1
Tony Pogson 1817 0 - 1
Colin Frank 1700 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1298 = (5093 + 400 * (0 - 3)) / 3)

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