Event: Rainham Championship Div 2

Opponent Rating Result
Terry Ogden 1350 ½ - ½
Gary R Clifford 1489 1 - 0
Tyrone R Jefferies 1583 1 - 0
Andrew C Waters 1886 0 - 1
Robert Springett 1644 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1590 = (7952 + 400 * (2 - 2)) / 5)

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