Event: Division 2

Opponent Rating Result
Dave J Williams 1721 0 - 1
Ryan Jones 0 1 - 0
Richard Harris 1426 1 - 0
Jack Lintern 1387 ½ - ½
David I Tipper 1790 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1425 = (6324 + 400 * (3 - 1)) / 5)

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