Event: Division 3

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Opponent Rating Result
Graham J Gibson 1627 0 - 1
Philip Erentz 1534 ½ - ½
Jim Wellington 1488 ½ - ½
Nigel D Marshall 1433 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1521 = (6082 + 400 * (1 - 1)) / 4)

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