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I'm not sure it's of much value to to identify a "-100" penalty or any other particular number, these days. Even the classic -30 and -950 penalties no longer show their characteristic "number".
For some people a penalty begins with a drop of one page. For others it can be 3 pages or 5 pages or 50 pages. I doubt that we'll ever penetrate any logic for the numbering scheme, or that the numbering scheme will even stay stable for very long.
Yes, the same site can have different degrees of penalty for different keywords and pages. Today's penalties are not necessarily calculated by substracting a number of positions. Instead, consider these possibilities that are all mentioned in one or more Google-owned patents.
The final ranking/relevance score for a url has several components. Some depend on the query terms and some, such as PR, are "query-independent." Just one component can be lowered by some number, or multiplied by some percentage -- then the final SERP is shuffled via what we can call a re-ranking.
Or more than one component may be affected by a subtraction or multiplication - or even a total zeroing out. Then it's also true that the final "composite" ranking can also just be subjected to a subtraction or multiplication.
So a lot of the time it's not going to fruitful to try to pinpoint a penalty "number" and use that to try to get the penalty removed.
[edited by: tedster at 9:11 pm (utc) on Aug. 5, 2008]
[edit reason] fix link [/edit]