Event: Silver Rook

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Opponent	Rating	Result
Mike Edbury	1606	0 - 1
Stephen Bastable	1777	0 - 1
Liam Knox	1582	0 - 1

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

1255 = (4965 + 400 * (0 - 3)) / 3)