Event: Division 2

Opponent Rating Result
Andrew Swales 1765 0 - 1
David Ruppert 1300 1 - 0
Richard Ball 1435 ½ - ½
Vladimir Chtym 1534 1 - 0
Myles Brunger 1500 ½ - ½
Geoffrey Cooper 1638 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1595 = (9172 + 400 * (2 - 1)) / 6)

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