Event: Club Championship

Opponent Rating Result
Mike Berry 1541 0 - 1
Peter Gregory 1587 0 - 1
David Halpin 1179 1 - 0
Andrew Zigmond 1664 0 - 1
Chris J Watt 1264 0 - 1
David Callaghan 1106 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1257 = (8341 + 400 * (2 - 4)) / 6)

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