Event: GP4 - December

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Opponent Rating Result
David Slidel 1197 1 - 0
Stephen D Blewitt 1932 0 - 1
Sharon Merchant 1492 1 - 0
William F Tracey 1677 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1575 = (6298 + 400 * (2 - 2)) / 4)

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