Event: Doncaster League

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Opponent	Rating	Result
Martin McGowan	91	0 - 1
John E Beech	125	½ - ½
Gerald R Thickett	103	½ - ½

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

-27 = (319 + 400 * (0 - 1)) / 3)