Event: Division 2

Opponent Rating Result
Matthew Hammond 1807 0 - 1
Thomas Brown 1568 0 - 1
Thomas Brown 1801 1 - 0
Graham K Brown 1735 ½ - ½
John Lightowler 1676 0 - 1
John S Burrows 1505 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1549 = (10092 + 400 * (1 - 3)) / 6)

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