Event: Division 4

Opponent Rating Result
Bryan D Harkness 1983 1 - 0
John S Marsh 1705 1 - 0
Ian R Rook 1503 1 - 0
David Simm 1551 0 - 1
David Stewardson 1615 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1911 = (8357 + 400 * (4 - 1)) / 5)

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