Event: A Division

Opponent Rating Result
Rayelynn Posadas 158 0 - 1
Bill March 114 ½ - ½
Peter Ridsdale 155 ½ - ½
Peter Harker 140 1 - 0
Jonathan Sams 155 ½ - ½
Paul D Perrett 156 0 - 1
Andy Corbyn 151 ½ - ½
David Richardson 128 ½ - ½
Stephen W MacCormack 146 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

145 = (1303 + 400 * (2 - 2)) / 9)

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