Great it works as you say, if i set each board to permit access to guest, but then i disallow global SMF guest access.

The reason why i want the recent topics to work like this is because my site will have as one of its major key points the quality of the topics being discussed(so i hope, hehehe). I will use a "Register to read the whole article and/or to read/post in the forum" approach.

Therefore the mod_smf_recenttopics in the frontpage is another very good way of showing to first-time visitors to my site that it´s worth registering.

The other way to tempt them i also use is to show only the intro of articles to guest, but must register to read the whole article.

Thanks for replying anyway 
NiCo

Thank you very much Wolverine 

For now i prefer to leave the links for guests. I know it sounds weird, but in my case(it might not suit all type of communities) i want to leave it clear that "You interested in this? Then you must register". I left the normal behaviour(guest clicks on link and is taken to the Login/Register box) but i changed the language defines a little bit to include a link to the cb user register page and also a link explaining why i require registration, blah blah blah).

But thanks for posting this hack anyway. I write it down in case i have to change approach ;-)

Cheers,
NiCo