I haven't studied your analysis in detail, but overall, my first impression is that you played very well. A bishop endgame with your pawn on e4 instead of d5 looks like a dream outcome, and you use the normal technique for winning Bishop endings against an isolated pawn, namely zugzwang. The only place where my first impression was that I would have played differently, was on the 32nd move. You mention the line 32...Ke6 33.fxe4 fxe4 34.Kd2 Kd5 35.Kc3. I believe this still looks winning for Black after 35...Bf6, relying on zugzwang again. If White is forced to play 36.Bg1, Black has 36...Bg5 (zugzwang again) 37.Bh2 (37.Bf2 e3 38.Bg1 Ke4) 37...Be3 38.Be5 Bg1 39. Bg7 e3 40.Kd3 e2 41.Kxe2 Bxd4 winning. Even if White had inserted b4 somewhere, this final position must be winning. If White tries to advance his kingside pawns to restrict your bishop, that would leave the way open for your king to intervene. At first sight, I preferred the line above to 32...exf3+, as White could have played 33.gxf3. My first thought was that if your only plan there is to create a passed pawn on the g file, White can shuffle his bishop between e3-f2-g1 and both protect d4 and stop your pawn. However, it looks like you can use zugzwang there as well. A position like Be3 v Bf6 with your pawn on g3 would put White in zugzwang. Then Bg1 v Bg5 and it's zugzwang again. So, while I haven't studied this thoroughly and I haven't used a computer for analysis, for the moment the pure bishop ending looks winning to me. Moving back to the diagrammed position, if you had anything better than what you did, I'm not seeing it. However, it would surprise me if that position is already objectively winning for Black. As White, I would have rushed the rook from g4 to the queenside, cover the important squares on the e file with a pawn on f3, a king on f1 and a bishop on f2, and only then offer the exchange of rooks (not necessarily both pairs, but if you get a pure bishop endgame with your pawn on d5 instead of e4, it looks hard to break through). Thus, 22...Rfe8 23.Rg3 Bf8 24.Rb3! (annoying!) 24...Re4 25.Be3 Re7 (what else?) 26.f3 Rae8 27.Re1 g6 28.Kf1 Bh6 29.Bf2 and White was in time to consolidate. You could try to improve on this with 22...Rae8 23.Rg3 Bd8 24.Rb3 Rf7 25.Be3 Rfe7, but after 25.Kf1, I don't see how you can interrupt White's plan, e.g. 25...f5 26.Re1 f4 27.Bd2 followed by f3, and White doesn't appear to be in trouble. If you are to try something else, 22...b6, as you mention, could be it. You should be better after that move as well, but I find it hard to believe it's winning.
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