Event: Division 2

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Opponent Rating Result
Judith Heffer 1686 0 - 1
Jakob Tulic 1675 1 - 0
Graeme Jones 1721 0 - 1
James Irwin 1789 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1618 = (6871 + 400 * (1 - 2)) / 4)

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