Event: IM Brown Shield

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Opponent	Rating	Result
Jack Howorth	1689	0 - 1
Ian Barker	1542	1 - 0
Richard Tate	1547	0 - 1

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

1459 = (4778 + 400 * (1 - 2)) / 3)