Event: calderdale 30

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Opponent Rating Result
John Nicholson 0 ½ - ½
Chris S Edwards 0 ½ - ½
Colin Frank 0 0 - 1
Angel A Gonzales 0 0 - 1
Steve Harrington 0 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

-80 = (0 + 400 * (1 - 2)) / 5)

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