Attention backgammon players: this book really will improve your game! I thought I was fairly good, without ever have studied theory, and I used to play casual lunch-hour sessions with a colleague at a dollar a point. It was about even. Suddenly, one week, he started winning much more often. He must have pulled a good 40 dollars ahead before he confessed he'd been reading Robertie (he's such a nice guy). I immediately ordered a copy, read it, and by the next week we were level again.
If you're another person who plays backgammon but knows no theory: my guess is that you're not playing aggressively enough in the opening. There will be other things you're doing wrong too, but that will be the most important one. You need to take more risks. Robertie will give you the details.