Event: North Norfolk Championship (85|10)

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Opponent Rating Result
David L Jones 1510 1 - 0
Michael J Gibbons 1865 ½ - ½
Robin Blackwell 1831 ½ - ½
Jacob Mulligan 1155 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1790 = (6361 + 400 * (2 - 0)) / 4)

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