Event: Division 2

Opponent Rating Result
Ken W Clow 1835 0 - 1
Leslie J Sargent 1351 1 - 0
Ryan Colclough 1624 0 - 1
Andrew P Willoughby 1734 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1536 = (6544 + 400 * (1 - 2)) / 4)

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