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Event: Open

Opponent Rating Result
Henry G Duncanson 2176 0 - 1
Jonathan S Hill 1973 ½ - ½
Hamish D Lyall 1788 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1979 = (5937 + 400 * (1 - 1)) / 3)

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