Event: Division 3

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Opponent Rating Result
Trevor Murch 1690 0 - 1
Andrew Walker 1406 ½ - ½
Sarah Pearson 1263 1 - 0
James Rushton 1254 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1403 = (5613 + 400 * (1 - 1)) / 4)

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