Event: Doncaster Haystead

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Opponent	Rating	Result
Peter Dawson	122	1 - 0
David P Hatfield	127	1 - 0
John P Mainwaring	140	½ - ½

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

396 = (389 + 400 * (2 - 0)) / 3)