Event: Hartley

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Opponent Rating Result
Hunain Malik 1689 0 - 1
Michael J Norris 1800 0 - 1
Iain Summers 1250 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1313 = (4739 + 400 * (0 - 2)) / 3)

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