A client is having a problem with some of their pages being outranked by affiliates for some random terms. They are a PR6 site, and rank very well for competitive terms. However, for some lesser known terms they are being trumped by www.example.com?kbid=1111 instead of www.example.com.
Now I'm wondering if there is anything I can place in robots.txt to combat this problem and make sure those pages are not crawled, without hurting the current pages.