I have been reading this book for the last few days now. Honestly I am a little bit disappointed. One reason is that it seems to be poorly edited with a few obvious errors, omissions and a few oddities.
Some examples:
* after 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 0-0 there is no
mention of anything else than the Averbakh move 6.Bg5. This is
surprising since Bologans coach Lanka - to whom he refers
troughout this book – has won a nice game vs. Hort after 6.g4!?;
6.h4 is another possibility missing
* in the chapter about the Four Pawns I couldn´t find the line 5.f4 0-0
6.Nf3 c5 7.d5 e6 8.Be2 ed5 9.ed5. Since this is not as innocent as it
looks, it should have been adressed
* in the Saemisch after 5.f3 0-0 6.Nge2 c5 7.d5 e6 8.Be3 exd5 9.cxd5
he suggests that 9…Nbd7 10.Ng3 h5 11.Be2 h4 12.Nf1 is slighty
better for white and instead recommends 9…h5. In the next
paragraph he writes that white now should not play 10.Ng3 because
of Nbd7 followed by h4 leading to a good game for black. This is just
a simple transposition to the first line?!
* on the other hand there are whole chapters devoted to minor lines
like 3.Nc3 Bg7 4.Nf3 0-0 5.Bf4 or 4.e4 d6 5.h3 0-0 6.Bd3.
There are quite some more examples of this type in the book.
It is true that Bologan often analyses two, sometimes even three moves for black. But some of these lines are evaluated as inferior, mentioned perhaps for instructive reasons (though he doesn´t say so).
Furthermore the bibliography consists of only two (!) books and an index of variations is missing.
Despite my criticism above there is surely a lot of good material in this book. So I do think that every serious King´s Indian player should have this book on his bookshelf. But I´m also sure that with a little more effort this could have been a much better book
I would give this book 3,5 out of 5 (chess-)stars.