Event: Doncaster League

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Opponent Rating Result
Alan Bramall 1818 1 - 0
Zak Tomlinson 1821 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

2220 = (3639 + 400 * (2 - 0)) / 2)

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Opponent Rating Result
Phillip J Battye 1642 1 - 0
T Ed Sowerby 1603 ½ - ½
Pete Micklethwaite 2004 ½ - ½
Peter JE Ackley 2121 ½ - ½
Martin Presley 1623 1 - 0
Zak Tomlinson 1814 0 - 1
Neil R Lowther 1887 0 - 1
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1813 = (12694 + 400 * (2 - 2)) / 7)