Event: Dons Club Challengers

Opponent Rating Result
David J Payne 1804 0 - 1
Keith Bradley 1614 ½ - ½
Madhurima De 1336 1 - 0
Colin R Payne 1691 0 - 1
Stephen F Crane 1446 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1498 = (7891 + 400 * (1 - 2)) / 5)

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