Event: Two West

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Opponent Rating Result
Stephen JM Hamilton 0 0 - 1
Edoardo De Angelis 0 ½ - ½
Laurie Mackellar 1690 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

430 = (1690 + 400 * (0 - 1)) / 3)

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