Event: U1800 Cup

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Opponent Rating Result
Adrian Sanderson 1540 1 - 0
Mark A Pulman 1623 0 - 1
Martyn Colebrook 1480 0 - 1
Mark Heffer 1698 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1385 = (6341 + 400 * (1 - 3)) / 4)

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