Event: U1850

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Opponent	Rating	Result
Jon SA Duckham	1847	½ - ½
David Barnes	1755	½ - ½
David Kierman	1752	1 - 0

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

1918 = (5354 + 400 * (1 - 0)) / 3)