I was thinking about Nc6, but after a long variation it comes down to a bishop+ knight vs. rook endgame, which is easily winning for black. Then I started looking at
The position comes from the source below. My God, the analysis makes Kasparov's analysis look like Chernev's.
http://www.chesscafe.com/text/dvoretsky71.pdf
And I received the following email from Mark Dvoretsky proving that Thud did not Blunder:
Dear Thud,
Thank you for your letter. You are right: I failed to find any advantage for White after both your defences. I believe, chances are about equal in both cases.
I) 4...e6! 5.Rde1!? (5.Rb1!?) 5...Rd2 6.Rf3 B:f4!, and now either 7.R:f4
Qd7(c7) 8.R:f6 Q:f7 9.R:f7 Nd6 10.Re7 - with four rooks on the board White
perhaps is not worse, or 7.Q:e6!? Qd7 (7...Kh6 8.R:f4 Kg7) 8.Qe4 Kh6
(8...g5?! 9.Rh3+ Q:h3 10.gh R:h2+ 11.Kg1 R:h3 12.Nf5 with White's advantage)
9.Q:f4+ Kg7 - White keeps fair compensation for a pawn.