Event: Summer League

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Opponent	Rating	Result
Derek I Lomax	1489	1 - 0
Peter Nelson	1728	0 - 1
Richard Maclannan	1719	0 - 1
Graham K Brown	1815	1 - 0
Derek I Lomax	1489	1 - 0
Peter Nelson	1728	1 - 0
Richard Maclannan	1719	1 - 0
Graham K Brown	1815	½ - ½

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

1838 = (13502 + 400 * (5 - 2)) / 8)