Event: A Division

Opponent Rating Result
Jonathan Sams 155 1 - 0
Virgil Szekely 187 0 - 1
Stephen W MacCormack 146 1 - 0
Peter Harker 140 1 - 0
Peter Ridsdale 155 0 - 1
Brian R Myers 144 ½ - ½
Richard J Harris 140 0 - 1
Brian Ellis 155 ½ - ½
performance = (sum(opponents ratings) + 400(wins-losses)) / games

153 = (1222 + 400 * (3 - 3)) / 8)

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