Event: IM Brown Shield

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Opponent	Rating	Result
Joshua Tedder	1571	1 - 0
Jack Howorth	1703	0 - 1
Steve A Spencer	1643	½ - ½

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

1639 = (4917 + 400 * (1 - 1)) / 3)