Event: Silver Rook

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Opponent Rating Result
Reece Campbell 1453 0 - 1
Steve Hutton 1127 1 - 0
Thomas Arrowsmith 1408 ½ - ½
Charlie Wainwright 1668 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1314 = (5656 + 400 * (1 - 2)) / 4)

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