Event: 5th Somerset New Year Major

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Opponent	Rating	Result
Dave J Williams	0	½ - ½
Peter Jones	0	1 - 0
H William Ingham	0	0 - 1
Benjamin Lappin	0	0 - 1
George Georgiou	1785	½ - ½

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

277 = (1785 + 400 * (1 - 2)) / 5)