Event: Watkinson League

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Opponent	Rating	Result
Richard S Boylan	142	½ - ½
Leo A Keely	178	1 - 0
Peter Shaw	196	½ - ½
Nigel R Hepworth	145	1 - 0
Leo A Keely	178	½ - ½

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

328 = (839 + 400 * (2 - 0)) / 5)