Event: A&B Division

Opponent Rating Result
Martin P McLoughlin 1820 1 - 0
Chris Swales 1706 0 - 1
Peter McKay 1597 1 - 0
Jim A Rogers 1615 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1785 = (6738 + 400 * (2 - 1)) / 4)

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