I didn't just add content, I built good links to that content, which increased the quality of the sites backlink profile. More links spread across more pages is something that can certainly help.
Also, it could be that adding the articles wasn't what helped the site. I'm just going over everything I did in order to give BHW my full experience.
Doesn't matter... this isn't what Penguin does.
At any rate, not trying to bust your balls about it, but there are a lot more filters/algorithms than just the 3 you mention in this thread anyway. It could have been reduced for a variety of reasons, however, if it was Penguin it would have happened on 10/5-10/7 otherwise it was something else.
Above is a Penguin hit site's rank. Why did it recover? absolutely JACK CRAP that's why... it went from #1-#3 (for months) to #200, to #15 .... by doing nothing to it.
This is in a niche so competitive, that top rankers (like myself) make low 5 figs/day profit. Of course, I have another site ranking top 4 already... which I had waiting for this.
Penguin is NOT what you think it is, and it's NOT heavily related to anchor text, no-follow or otherwise. Except on the extremes of course.
The above is the anchor pie chart for the #1 site right now (post 10/7, before that my site was #1 for almost 3 months).
Notice that 41% of its anchors are the keyword it is ranking for or keyword XXXX
It also has 94% no-follow links
Penguin anchor diversity is a myth.F
Fair warning, no non-news/ultra authority sites made it through penguin 10/5-10/7, meaning that there may not be ANY long term strategy for ranking such ultra competitive keywords now. All niches I'm in, if the site was ranking for >3 months it's now not ranking on the first page (all but myself disappeared entirely).