Event: Division 1

Opponent Rating Result
John Staniforth 1810 0 - 1
John Staniforth 1810 ½ - ½
Michael WA Hoare 1609 1 - 0
Steve F Tarr 1830 1 - 0
Tony Preece 1878 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1787 = (8937 + 400 * (2 - 2)) / 5)

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