Event: Division One

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Opponent Rating Result
David Smith 141 ½ - ½
Golam S Ali 169 0 - 1
Nick W Roberts 170 ½ - ½
David Molineux 120 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

50 = (600 + 400 * (0 - 1)) / 4)

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