Event: Division 3

Opponent Rating Result
Nick J London 1706 0 - 1
Paul Wileman 1638 ½ - ½
Nikolai Harrison 1655 0 - 1
Thomas Pownall 1601 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1550 = (6600 + 400 * (1 - 2)) / 4)

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