Event: 400 League

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Opponent Rating Result
Alan S Taylor 80 ½ - ½
Martin Wilkes 80 1 - 0
Ivan Basarab-Horwath 110 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

90 = (270 + 400 * (1 - 1)) / 3)

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