Event: Richard Furness(500) League

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Opponent	Rating	Result
Stephen Deakin	1650	1 - 0
Geoffrey Slater	1600	1 - 0
Vincent Shanahan	1650	1 - 0
Bryan Slater	1550	1 - 0

performance = (sum(opponents ratings) + 400(wins-losses)) / games

2013 = (6450 + 400 * (4 - 0)) / 4)