Event: Bak

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Opponent Rating Result
Kenneth L Marsden 1378 1 - 0
Stephen Burton 1419 0 - 1
Nicholas Waite 1398 1 - 0
Steve Gledhill 1451 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1412 = (5646 + 400 * (2 - 2)) / 4)

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