Event: Worcestershire Challengers' League

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Opponent	Rating	Result
Joe Rastall	1700	0 - 1
Phil Maddocks	1734	0 - 1
Antonia (Toni) T Reed	1569	1 - 0
Scott Russell	1817	0 - 1
Luke Barton	0	1 - 0
Luke Barton	0	1 - 0
George Charman	1785	0 - 1
Matthew Jordan	1745	0 - 1

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

1194 = (10350 + 400 * (3 - 5)) / 8)