Event: Division Five

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Opponent Rating Result
Rob Frost 1200 0 - 1
Harry McCormack 1000 ½ - ½
Richard F Collett 1391 ½ - ½
David W Randall 1270 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1215 = (4861 + 400 * (1 - 1)) / 4)

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