Event: Division 1

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Opponent Rating Result
Roy Phillips 2179 0 - 1
Colin J Davis 2115 ½ - ½
Ahmed Khankar 1830 ½ - ½
Peter J Kirby 2059 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1946 = (8183 + 400 * (0 - 1)) / 4)

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