Event: Harry Lamb

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Opponent Rating Result
Harry H Altoft 1262 1 - 0
Harry H Altoft 1262 ½ - ½
James Marshall 1393 ½ - ½
James Marshall 1393 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1528 = (5310 + 400 * (2 - 0)) / 4)

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