Too many solutions presented in this strike me as anywhere from probably wrong to almost certainly wrong. I'm not expert at this however I guess my history of playing computers has shaped my play in a way that finds 1975 strategy to be pretty wanting. On the one hand, it's probably an ok book for somebody who is more of a beginner, but, on the other hand, it's going to teach a bunch of wrong ideas in some places.
I should get my hands on Bagai's book where he goes through and revisits the positions this crop of older books got wrong.