Event: The Friendly League

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Opponent Rating Result
Michael Deasey 0 ½ - ½
Shaun Tumelty 0 0 - 1
Thomas Martin 0 ½ - ½
Neil Taylor 0 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-200 = (0 + 400 * (0 - 2)) / 4)

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