Event: Div1

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Opponent Rating Result
Peter M Collins 160 ½ - ½
Brian Crofts 131 ½ - ½
Martin Cobham 149 0 - 1
Kevin J Dalley 171 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

153 = (611 + 400 * (1 - 1)) / 4)

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