Event: Division 2 - Weston Trophy

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Opponent	Rating	Result
David Watson	145	1 - 0
Geoff Frost	167	0 - 1
David Watson	147	0 - 1
Peter Cooper	133	0 - 1
W (Bill) Ward	133	0 - 1
James I Davies	0	1 - 0
Daniel Gottschalk	168	0 - 1

performance = (sum(opponents ratings) + 400(wins-losses)) / games

-44 = (893 + 400 * (2 - 5)) / 7)