Event: Silver Rook

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Opponent Rating Result
Nathan Madzia 1579 1 - 0
Jacob Smith 1644 ½ - ½
John George 1738 ½ - ½
David Summerland 1488 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1812 = (6449 + 400 * (2 - 0)) / 4)

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