Event: Division 3 Rapidplay Cup

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Opponent Rating Result
David Welsh 1491 0 - 1
David Welsh 1491 0 - 1
Ken Lunn 1561 1 - 0
Ken Lunn 1561 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1426 = (6104 + 400 * (1 - 2)) / 4)

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