Event: Atkinson Cup

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Opponent	Rating	Result
Richard Atkinson	1590	½ - ½
Steve Tomlinson	1448	1 - 0
Peter T Perkins	1649	0 - 1

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

1562 = (4687 + 400 * (1 - 1)) / 3)