Event: Silver Rook

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Opponent	Rating	Result
David Halpin	0	0 - 1
Ethan Stuckey	0	0 - 1
Barry Fulthorpe	78	½ - ½

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

-241 = (78 + 400 * (0 - 2)) / 3)