Event: Worcestershire Challengers' League

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Opponent	Rating	Result
John F Varilone	1639	½ - ½
Kevin Hurney	2046	0 - 1
Julie C Wilson	1800	1 - 0
Phil Maddocks	1734	½ - ½
Joshua Clarke	1788	1 - 0
Matthew Jordan	1745	½ - ½
Scott Oxtoby	1493	0 - 1

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

1749 = (12245 + 400 * (2 - 2)) / 7)