Event: Division One

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Opponent Rating Result
Peter M Collins 158 ½ - ½
Martin D Smyth 160 ½ - ½
Neil J Owen 172 0 - 1
Julian H Summerfield 149 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

60 = (639 + 400 * (0 - 1)) / 4)

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