Event: Mamhead

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Opponent Rating Result
Alan W Brusey 174 0 - 1
Robert H Jones 127 ½ - ½
Phil J McConnell 124 1 - 0
Michael H Stinton-Brownbridge 163 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

47 = (588 + 400 * (1 - 2)) / 4)

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