Event: Good Friday Rapidplay

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Opponent Rating Result
Matthew Hill 1793 0 - 1
Ben Stephen Thomas 0 0 - 1
Thomas Chapman 1446 0 - 1
Damon Williams 1398 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

959 = (4637 + 400 * (1 - 3)) / 4)

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