Event: Division 4A

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Opponent	Rating	Result
Harry Duckworth	1504	1 - 0
Samuel Thomson	1468	0 - 1
Gregory Sumner	1444	½ - ½

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

1472 = (4416 + 400 * (1 - 1)) / 3)