InfoPath Limits Conditions to no more than FIVE clauses in a single rule!

I was very disappointed to discover that the InfoPath GUI limits my Conditional Formatting rules to a maximum of five condition clauses per rule.

I have a viable requirement that requires me to consider the values of six (that's right, 6) different fields before hiding a control, and this means I can't make it work through the UI tools.

What to do, what to do?!

It turns out you may be able to achieve the desired effect using a custom XPath expression. Standby while I learn XPath well enough to test this out. ;-)

If anyone has any tips to share on how to achieve this, please add a comment to this post.