Event: Dons Christmas Allegro

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Opponent	Rating	Result
Keith C Osborne	1570	0 - 1
Johnny Danger	1520	½ - ½
Chris Jones	1583	0 - 1

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

1291 = (4673 + 400 * (0 - 2)) / 3)