fjd wrote on 08/03/18 at 20:03:22:
I've just downloaded the e-book version of this book. Comparing Pert and P/I's analysis, the latter seem to recommend 15 Qf3 for White (in their Game 43, Pert's line A), when they mention Pert's suggestion 15...Ke7 as "possible", without giving it an evaluation.
Following the course of the main game, Pert's recommendation of 17...Nd4 is again mentioned, and a game is quoted as leading to a draw, but without further assessment.
I don't have Pert's book, but I have P&I's book, so I will refer to that.
The first line you mention.
1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Nc3 Bb4 5. Bg5 dxc4 6. e4 c5 7. Bc4 cd4 8. Nd4 Qa5 9. Bb5! Bd7 10. Bf6 Bb5 11. Nb5 gf6 12. O-O Nc6 13. a3 Bc3 14. Nc3 Rg8
15.Qf3 Ke7!? 16. Rfd1 Rad8 "is possible," P&I. I am still learning this stuff, so will lean on Stockfish 14, which indicates the game is equal (SF-12 or so).
Your second line.
1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Nc3 Bb4 5. Bg5 dxc4 6. e4 c5 7. Bc4 cd4 8. Nd4 Qa5 9. Bb5! Bd7 10. Bf6 Bb5 11. Nb5 gf6 12. O-O Nc6 13. a3 Bc3 14. Nc3 Rg8
15. f4 Rd8 16. Qe1 Qb6 17. Rf2 Nd4
P&I give several alternatives for black on move 17. "17...Kf8!?" in particular evaluates well with SF (around SF 0). The position is sharp, but I think there may be a few satisfactory moves, and perhaps some unsatisfactory ones as well.