Event: St Andrews Club Championship

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Opponent Rating Result
Robin A Edwards 120 ½ - ½
Bryan Wilson 110 0 - 1
David P Thrun 79 1 - 0
Stephen Garner 88 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-1 = (397 + 400 * (1 - 2)) / 4)

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