Event: Division 3

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Opponent Rating Result
Stephen Smithson 1323 0 - 1
Keith Milner 1150 1 - 0
Simon A Jones 1383 0 - 1
Stephen Luff 1150 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1152 = (5006 + 400 * (1 - 2)) / 4)

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