Event: Division 2

Opponent Rating Result
John Lightowler 1676 ½ - ½
Ian P Blencowe 1612 1 - 0
Thomas Brown 1587 0 - 1
David Horton 1186 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1615 = (6061 + 400 * (2 - 1)) / 4)

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