Event: Rated club games

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Opponent Rating Result
Roy A Ludlow 1640 0 - 1
Alex Mountford 1431 ½ - ½
Ian Threlkeld 1576 0 - 1
David L Weston 1666 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1278 = (6313 + 400 * (0 - 3)) / 4)

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