Event: Division 2

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Opponent Rating Result
David O Vaughan 151 ½ - ½
Thomas McLaren 163 1 - 0
John H Sleggs 118 1 - 0
Elena Dyulgerova 140 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

243 = (572 + 400 * (2 - 1)) / 4)

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