Event: Hutchinson

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Opponent Rating Result
Paul Kadzionis 105 ½ - ½
Stephen Burton 109 0 - 1
Mark McGinty 109 0 - 1
Mahboob Nawaz 93 ½ - ½
Dave Young 81 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

19 = (497 + 400 * (1 - 2)) / 5)

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