I’m unclear on what you are trying to do, but, while it can be effective sometimes, neither of the search engines like you splitting up your content on a bunch of microsites and drawing on a larger domain to fake the popularity of the smaller domain, or much worse, use smaller domains as “doorways” to a bigger domain.
“Crosslinking” is natural and useful to a degree, but its a complete crap tactic that the engines punish harshly if taken to an extreme. If all you do is interlink a bunch of junky domains, then you risk little, but if you do have one key domain, interlinking it with a family that will likely get in trouble will get the main domain in trouble.
More to the point, making separate domains is worthless. Search engines rank pages. Make a new page on your main domain. That way you can always have your exact keyword in the url, like xyz.com/blackjack-odds.htm or whatever.
If you have a handful of really great keyword domains, then fine, having several things is fine. Having dozens of one page sites is either suicide, or doomed since you can’t generate any link power without interlinking.
Disclaimer: I hate trashy little bits of nothing. Make better sites and make more money.