Long ago at the Columbus Go Club, a guy called Corey mentioned that a guy called Bruce Wilcox used to play tengen successfully on the 19×19 board. He had a very nice piece of software to learn about Go called Go Dojo. It is a playable book with over 900 pages of material covering 2 types of skills – contact fights (hand-to-hand combat) and sector fights (whole-board management).
Bruce recommends mastering the first 2 levels of contact fights and then moving on to the first two levels of sector fights.
A deep description and ordering information for Contact Fights is available here.
A deep description and ordering information for Sector Fights is available here.
You may learn more about his other products and more at his Senseis page.