Queen vs. Rook and Rook vs. Knight Endgames

I'm having a lot of trouble with these challenges on Chessmaster (King and Queen vs. King and Rook, King and Rook vs. King and Knight), and can't seem to find any decent sites which explain how to win these. Do you guys know of any good sites or articles on these?

hrmm.... those are very tough positions :) anyone want to write on those?!

i think you might be best off with a book on that subject! 

Why don't you post the precise positions to the Endgame Study forum?

• Rook vs Knight is usually drawn.
• Rook vs Queen is usually won, but extremely difficult against best play.

I'm guessing Chessmaster is not giving you random theoretical positions, but rather practical ones that are easy to wins with some thought.

Most endgame books cover this material. These aren't easy enough to deal with in just a short article on the internet.

--Fromper 

There are actually information on the internet:

Rook vs Knight:
http://www.everything2.com/index.pl?node=Rook%20vs%20Knight%20Endgames
That is the first link from this Google search:
http://www.google.com/search?hl=en&q=Rook+vs+Knight&btnG=Google+Search

Queen vs Rook:
http://www.google.com/search?hl=en&q=Queen+vs+Rook&btnG=Search