Event: Division 4

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Opponent Rating Result
Roger Ball 1480 ½ - ½
Nigel Foster 1539 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1310 = (3019 + 400 * (0 - 1)) / 2)

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Opponent Rating Result
Matthew McHugh 1493 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1493 = (1493 + 400 * (0 - 0)) / 1)