Event: 4-Board Division 1

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Opponent Rating Result
David P Thrun 97 1 - 0
F Hal Jorna 118 1 - 0
Jim snr McDonald 86 1 - 0
N Charles Clayton 97 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

500 = (398 + 400 * (4 - 0)) / 4)

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