Event: Derby & District Division 1

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Opponent Rating Result
Martin Pettinger 2029 ½ - ½
Derek A Jarvis 1902 0 - 1
David Hatton 1791 0 - 1
Martin Cobham 1752 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1569 = (7474 + 400 * (0 - 3)) / 4)

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