Block sites for one channel?

I have a site-wide advertiser who I want to block in one channel.

[hyperstat]

I have site that is mostly about statistics. However, I have one page about chess. Recently I've been getting a lot more traffic on the chess page. Unfortunately, ads from a site-wide statistics advertiser often appear on this page. Any suggestions?

[timwestla]

If you go into the Custom Channels section of AdSense Setup, there's an "edit settings" link next to each channel. When you edit the settings you can check a box that says "Show this channel to advertisers as an ad placement." If the advertiser is targeting your site that way, you could easily define the pages where you want them to advertise. If they are targeting your entire domain then I suppose it would be more difficult, maybe impossible.