Event: Doncaster Jamboree

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Opponent Rating Result
David P Hatfield 1570 0 - 1
Jordan Bircumshaw 0 1 - 0
Peter M Tate 1579 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1050 = (3149 + 400 * (1 - 1)) / 3)

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