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Took a look in code, made some minor tweaks but to me page were ok and page is still PR4. I couldn't find anything to be penalized. And other results in first position are not better. I mean, I can understand a shake of some positions, but this is different.
It's quite strange though. I can only think is related to a recent hosting change I made, but rest of site is ok, so wonder if Google is experimenting...
If I search in my domain using google page is there but is not listed in first 400 results and probably beyond.
You've probably been 950'd. Look for that thread in this forum, although you might have to go back some as it's been a continuing thread for most of this year.
I have a single 950'd page that actually GAINED pagerank from 2 to 4, and is still 950'd. It shows up on the last page, whether it's 700 results or 800 results or 950 results.
Last time I had this happen, I did two things - I acquired one good PR5 link to the page, and I also REDUCED the frequency of one of my main keywords (in this case, the name of a city) I don't know if it was either tweak, or both, or neither, but I popped right back up again. Your mileage may vary. I have tweaked my current 950 page, but it's hasn't been indexed yet since I did it.
I'd say that page was perhaps repating too much name of city and Google may treat that as keyword abuse to 950d.
Thread about 950 is almost impossible to follow (extremely long).
I guess I have no other choice that wait expecting my tweak works and recover some positions back after a while (months?)
This is not part of the 950 I can tell you that this is one or two things.
1- You are in a penality
2- You messed up the transfer and didn't wait till the SE bots had visited the site reconized the new dns change and been routed to the correct ip address.
This can take sometimes 3 days you are suppose to make sure the SE bots are NOT going to the old IP address before you shut the server down.
Were is your domain name if your do a search fot it? I can't tell from what you said. Is it 400 or what?
I am or was in the 950 and my domain search always was #1 in my search a 950 is most times related to a keyword term you use to rank but now have been sent to the last page on the search usually around page 900-950 depends on the term.
In position #2 comes a page of my site (other section) but my page citiname.html does not appear at all.
If I goto my site, and then search from google bar:
My page appears as first and only result which is logical. (does that mean my page have been removed from google's index?)
I don't think a technical problem may affect 1 page only. My whole site should be affected enterely...
Why would you assume this? I have seen tons of errors on one page that can cause indexing issues in Google, and in fact one just happened to me personally.