This pdf excerpt shows analysis of the Quaade Gambit (p. 139-145 in the book), yet not the main line. It is mainly about the ancient 7...g2+?. Do you really find it so impressive how Shaw is covering this long refuted side-line? Let's see a key position of this chapter:
So this line is old, according to Shaw's "notes". It was studied by Korchnoi/Zak, even by Levenfish. That would be
1940. The truth is, 9.Qh5 had already been analyzed an four pages by C. von Schmid in
Deutsche Schachzeitung 1884, p.195-198.
Henk Smout has compared Shaw's results with this source, and with other authors. Shaw's analysis may be fine, but he has this strange aversion to mention earlier authors. Would anybody call his analysis in this concrete chapter "dense", knowing that Shaw avoids to consider existing analysis by Schmid, Euwe, Keres, Schneider?
However, I am personally more interested in main lines. That main line of Shaw's recommended Quaade follows the game Zvjaginsev - Smirnov, 2008:
1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Nc3 Nc6 5.g3 d6 6.d4 Bg7 7.d5 Ne5 8.gxf4 gxf4 9.Bxf4 Bg4 10.Bb5+ Kf8 11.Be2 Bxf3 12.Bxf3 Qf6 13.Bxe5 Qxe5. Shaw recommends "14.Qd3!?N". One of his lines goes: "14...Qg5 also stops long castling, but then 15.Ke2!? (unclear) is fun; the rooks are likely to be well placed on f1 and g1." A possible continuation would be 15...Re8 16.Raf1 Nf6.
Not much fun for White, if you ask me. Black has a slight plus.