how to improve my mathematics skill without reading the book?

and without playing the chess!! how.. activity that are fun and enjoyable…

What is a good chess website?

Preferably about tactics and how to improve your skills. Not for beginners.

Are there any computer version chess books? (Not ebook)?

I find chess books to be very helpfull in improving my chess play; however, chess studying thru a chess book is very time consuming and confusing at times because I have to set up a board and have to follow the annotations included in the book. I would like a chess book especially about strategy or game assessment that is made as a computer version software where the lecture is there via text or audio and the positions are played by pressing on the board arrows.