Event: Division 4

Opponent Rating Result
Iain Reeve 1720 1 - 0
Matt Bourke 430 ½ - ½
Adam Tarling 1720 1 - 0
David Thomas 1765 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1609 = (5635 + 400 * (2 - 0)) / 4)

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