Event: IM Brown Shield

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Opponent	Rating	Result
Paul May	1876	0 - 1
Thomas Goulden	1470	0 - 1
A Jon Griffith	1742	1 - 0

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

1563 = (5088 + 400 * (1 - 2)) / 3)