Quote:what is recommended against KG, Four Knights, Vienna etc?
KG: "Against the King's Gambit I am a firm believer in 2...Bc5 as a simple and strong defence."
Four Knights: "I recommend that black play a simpler line [compared to the "aggressive" Rubinstein variation against the Spanish Four Knights], but one which retains more play in the position. Capablanca's 4...Bb4 5.00 00 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7 9.Re1 Nd8 10.d4 Bg4 leads to an interesting fighting game in which Black gets a share of the chances."
4.g3 is also considered in the Four Knights in one game. "4...d6 is a quite a nice idea because it forces White to lose time with 5.h3 if he wants to avoid 5.d4 Bg4." The game in question is Hector-Giorgadze, Spanish Team Championship, 2003 (0-1 in 72 moves).
Vienna: 3 games that start 1.e4 e5 2. Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Nf3 Be7 (Hellers-Karpov, Haninge 1990) and 1.e4 e5 2. Nc3 Nf6 3. g3 c6! ("might well put 3.g3 out of business") and 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nc6 4.d3 Na5 (This game is also meant to cover Black's response to the Bishop's Opening.)
One game on the Ponziani and one on the Center Game (black fianchettos his king's bishop) . Analysis of the Danish Gambit is incorporated with the analysis of the Scotch Gambit (also one game). The Scotch Four Knights and Belgrade Gambit are also covered in one game.
Obviously, there was a lot to cover in limited space.
The book is in the usual Everyman complete game style with summaries provided at the end of each chapter instead of an index of variations at the back of the book.
Obviously, the Ruy Lopez gets the lion's share of the coverage (101 of the book's 192 pages).
In the introduction, GM Davies writes that his goal was to make playing 1...e5 a "practical proposition" for club players. And that he adopted a "keep it simple" solution to most of white's options (except for the Ruy Lopez).
I hope this helped a bit.