Event: Rainham Championship Div 2

Opponent Rating Result
Chris D Brown 1457 ½ - ½
Gary R Clifford 1489 0 - 1
Tyrone R Jefferies 1583 0 - 1
Robert Springett 1640 0 - 1
Andrew C Waters 1886 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1291 = (8055 + 400 * (0 - 4)) / 5)

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