Event: Division 2

Opponent Rating Result
Simon Johnson 1835 0 - 1
Oliver Tatlow 1541 1 - 0
Stephen Burton 1419 ½ - ½
Victor Ibealozie 1355 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1638 = (6150 + 400 * (2 - 1)) / 4)

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