Event: Division 2

Opponent Rating Result
Chris A Fraser 1556 ½ - ½
Mick Sandham 1654 ½ - ½
Simon Scott 1698 0 - 1
Nader Nader 1500 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1602 = (6408 + 400 * (1 - 1)) / 4)

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