Event: Division 2

Opponent Rating Result
Nick Mullan 1537 ½ - ½
Paul G Day 1680 0 - 1
Andrew B Mata 1849 ½ - ½
Chris S Edwards 1683 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1687 = (6749 + 400 * (1 - 1)) / 4)

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