Event: Division 4

Opponent Rating Result
David McKee 1567 0 - 1
Joe Ledgerton 1418 ½ - ½
Lee Walls 1619 0 - 1
John Clarke 1531 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1234 = (6135 + 400 * (0 - 3)) / 4)

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