Penguin Recovery tactics
 

Hello Friends,

Does anyone know how penguin works or have some advice what else I can do besides checking all the links to my site manually?

Thanks in advance.

Yes, there are some tips which is good to get recover from penguin updated:
De-optimize the web site
Increase quality links to pages
Make sure to link anchor text is more natural
Remove links from Blogrolls
Scale back the internal link anchor text
Exact match domains hurt
Practice negative SEO
Move content to a new domain
Build a smaller site with very few pages
Write better content.