Event: Division 4

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Opponent Rating Result
John S Marsh 1736 ½ - ½
John S Marsh 1738 0 - 1
Robert Heyman 1563 ½ - ½
Phil H Jackson 1575 1 - 0
Joe Chan 1615 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1725 = (8227 + 400 * (2 - 1)) / 5)

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