Event: Division 2 - Weston Trophy

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Opponent	Rating	Result
Andrew J Mort	163	0 - 1
Geoff Frost	167	½ - ½
Andrew J Ledger	221	0 - 1

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

-83 = (551 + 400 * (0 - 2)) / 3)