Event: Division 4

Opponent Rating Result
Hanif Zaman 1643 0 - 1
Joe Chan 1614 0 - 1
David Simm 0 ½ - ½
Steven Eggleston 1615 0 - 1
David Simm 1601 ½ - ½
David Stewardson 1628 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1217 = (8101 + 400 * (1 - 3)) / 6)

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