Event: Division 2 - Weston Trophy

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Opponent Rating Result
Steve J Mann 157 ½ - ½
John R Mercy 157 0 - 1
John R Mercy 157 0 - 1
Alan S McIntosh 146 ½ - ½
Steve Bracey 152 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-6 = (769 + 400 * (0 - 2)) / 5)

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