Event: The Friendly League

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Opponent Rating Result
John Jarmany 2188 ½ - ½
Martin Baxter 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

894 = (2188 + 400 * (0 - 1)) / 2)

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Opponent Rating Result
Steve J Horrocks 1923 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1523 = (1923 + 400 * (0 - 1)) / 1)