Dear Peter, I guess that you are talking about "Hylland free riding", rather than about "favourite betrayal".
See section 7 of my paper: http://m-schulze.9mail.de/schulze2.pdf "In this context, Hylland free riding means that a voter votes preferably for those of his favorite candidates who are lower in the expected party list. (...) With this strategy the stronger candidates get lower places than they would have got otherwise, while the weaker candidates get better places than they would have got otherwise; therefore, the aim of this strategy is that the stronger candidates get places that are still good enough and that the weaker candidates get places that are just good enough to get elected." Markus Schulze ---- Election-Methods mailing list - see http://electorama.com/em for list info
