Event: B&DCL Div 4

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Opponent Rating Result
Robert Powell 1700 0 - 1
Andrew M Alderton 1578 0 - 1
Stephen Bailey 1180 1 - 0
Joe Wood 1420 ½ - ½
Joseph Ballard 1540 1 - 0
Rachel Richardson 1323 1 - 0
Ken Dixon 1368 1 - 0
performance = (sum(opponents ratings) + 400(wins-losses)) / games

1558 = (10109 + 400 * (4 - 2)) / 7)

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