Event: Bak

Opponent Rating Result
Derrick J Mason 1430 1 - 0
Ralph Barraclough 1502 0 - 1
Gary Kent 1097 0(def) - 1
Rik Panesar 1237 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1256 = (4169 + 400 * (1 - 2)) / 3)

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