Event: D Division

Opponent Rating Result
John Marsden 1399 0 - 1
Richard Stevenson 1166 ½ - ½
Stanley Allan 1309 0 - 1
Nick Tadd 1174 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1162 = (5048 + 400 * (1 - 2)) / 4)

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