Event: Bak

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Opponent Rating Result
Scott Townend 0 0 - 1
Steve Gledhill 1375 0 - 1
Derrick J Mason 1439 0 - 1
Ralph Barraclough 1571 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

896 = (4385 + 400 * (1 - 3)) / 4)

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