1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bf4 O-O 6. Rc1 dxc4 7. e3 Be6 8. Ng5 Bd5  9. e4 h6 10. exd5 hxg5 11. Bxg5 Nxd5 12. Bxc4 Nb6 13. Bb3 Nc6 14. Ne2 Rc8 15. h4! Nxd4 16. Nxd4 Qxd4 17. Qxd4 Bxd4 18. h5 ("despite the exchange of queens White has dangerous attacking chances for the pawn" quoth Glenn Flear, "Daring Defenses" May update) 18...gxh5  19. Rxh5

First question.   Instead of Berthelot's 19...c5 which led to trouble for Black, 19... Bxb2 (I propose this as best) 20. Rc2 (Flear mentions 20. Bf4 e5 21. Bxe5 Bxe5 22. Rxe5 without comment, but it seems to me that White will have trouble proving his pawn's worth) and now Flear gives 20... Bg7 21. Bxe7 Rfe8 22. Re2 c6 23. Rg5 as better for White.

But isn't 20...Bf6 a better try?  For example 21. Re2 Rfd8  22. Bh6 Rd4!  23. Re3 Rg4 and Black appears to hold, though White perhaps has enough play for his material.

Second question.  Flear gives 19...Bg7  20. Rc2 e6 as best.  However, doesn't the considerably more active 20. Rc5 preserve good winning chances?  For example, 20...Nd7  21. Ra5 a6  22. Rh3 or 20...e6  21. Be3.