Event: Division 2

Opponent Rating Result
Thomas Ash 1642 0 - 1
Thomas Merchant 1368 ½ - ½
Thomas Ash 1724 0 - 1
Richard Collis 1486 1 - 0
Thomas Merchant 1603 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1565 = (7823 + 400 * (2 - 2)) / 5)

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