Event: D&DCL Div 1

Opponent Rating Result
Martin Pettinger 1941 0 - 1
David Smith 1825 1 - 0
Simon R Edwards 2038 0 - 1
D Martin Howard 1996 0 - 1
Derek A Jarvis 1869 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1694 = (9669 + 400 * (1 - 4)) / 5)

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