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Did you read everything about Ilse in the discussion on Dutch search engines? [webmasterworld.com] and do you mean that you have actually tried all of that? I notice that your site is about insurance, which appears to be extremely competitive in the Netherlands. A few months ago, we had somone observing here that the whole first page of search replies for an auto insurance search seemed to be filled with sites that had been cloaked.
If that is true, then you are indeed up against very heavy competion from numerous professional search engine optimization experts. To make it, you will either have to buy their services or outsmart them - which is a lot less expensive, but much more time consuming.
Basically, you will have to analyze in great detail all aspects of the sites that outrank you for the keywords you want to target. If that is not possible due to cloaking, then you have to run a series of systematical experiments in order to get exactly what Ilse likes.
The real problem is there are too many sites with a 100% score. These are all ranked equally and rotated every 24 hours.
( Encouraging spam, with two sites you have a double chance of being on page one on any given day)
At the moment there are 95 listings in Ilse with a 100% score for the dutch translation to 'insurances' (verzekeringen).
This is common for competitive terms. Keyword research is very important for Ilse. They do have a lot of traffic...it pays to go for niche keywords.
I don't think they ever use human intervention for their spidered results if you don't trigger any of their (very limited) spam filters.
They do seem to be responsive to complaints about spam and will remove the offending site.
They seem to be experimenting with a new spider since last week. It's coming from
folk.l3.ilse.nl(213.244.181.190)
The referrer is usually
www.ilse.nl/robot.html
UserAgent
INGRID_4_SP/1.0