Event: IM Brown Shield

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Opponent Rating Result
Nathaniel Mackenzie 1273 ½ - ½
Peter T Perkins 1678 0 - 1
Dave Colledge 1718 ½ - ½
Simon Skinner 1612 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1570 = (6281 + 400 * (1 - 1)) / 4)

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