Event: Hargreaves Shield

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Opponent	Rating	Result
Gary Hilleard	119	½ - ½
I Redmond	80	½ - ½
Graeme Boxall	93	0 - 1

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

-36 = (292 + 400 * (0 - 1)) / 3)