Event: Worcestershire Rapidplay league

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Opponent	Rating	Result
Daniel M Lambourne	2100	0 - 1
Joe Conway- Lees	1688	0 - 1
David Spowart	1789	0 - 1
Julie C Wilson	1800	1 - 0
Daniel M Lambourne	2100	0 - 1
Joe Conway- Lees	1688	1 - 0
David Spowart	1789	0 - 1
Julie C Wilson	1800	1 - 0

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

1744 = (14754 + 400 * (3 - 5)) / 8)