Sep1116
  fredthebear: White generates complications with an exchange sacrifice and fends off the Black pawn thrusts by penetrating with the knights, which become irritating to Black. The queens are exchanged due to threats made possible by the blockading Ng6 and White has an extra piece. Perhaps 21...gxBf6 or 23...Bc5 gets better results for Black, although he's still left with three leaky pawn islands. 

Sep1920
  al wazir: Where's the win after 18...Rxe1 ? If 19. Nxf6+, then Kh8 20. Nxd7 Qxd7, and black is still an exchange up. 

Sep1920
  Gregor Samsa Mendel: <aw>After 18..Rxe1 19 Nxf6+ Kh8 20 Qf5 looks pretty good for white. 

Sep1920   latebishop: After 18.Rxe1 19.Nxf6 + Kh8 White seems to have 20.Qf5 g6 21.Qxd7 leaving him with two knights for a rook. 

Sep1920   Walter Glattke: 17.Rxd7 wins, A) 17.Rxd7 18.Rxd7 18.Rxe1 (AlWazir) 19.Nf6+ gxf6 20.Qg4+ Bg7 21.Qxg7# A2) 19.Kh8 20.Qf5 g6 21.Nh5+ Kg8 22.Qf6 gxh5 23.Qh8# B) 18.Nd7 19.Qxf7+ Kh8 20.Ng6+ hxg6 21.Rxe8 Rxe8 22.Qxe8 Kh6 23.Ne5 Nxe5 24.Qxf8 Ng4 25.h3 won ending 

Sep1920   RandomVisitor: Black should have left the epawn alone on move 10: click for larger viewStockfish_20091507_x64_modern:
<39/45 04:22 +0.16 10...Be6 11.Qe2 00> 12.Nc4 Bxc4 13.Qxc4 Rfe8 14.a4 Rab8 15.Qe2 b5 16.Ne1 Nc5 17.Nd3 a5 18.Bc3 Nxd3 19.Qxd3 b4 20.Bb2 Bc5 38/53 04:22 +1.01 10...Bxe4 11.Nc4 Be7 12.Re1 Rd8 13.Qe2 Bxf3 14.Bxf3 00 15.Nxe5 Bb4 16.Nxd7 Nxd7 17.c3 Bc5 18.Kg2 Qb8 19.Qc2 Ne5 

Sep1920   Brenin: <Walter Glattke>: What about C) 18 ... Qxd7 (after 17 Rxd7 Rxd7 18 N(not R)xd7 in your line), rather than 18 ... Rxe1? After 19 Rd1 Nd5 White seems to have only a minimal advantage. White needed 18 Ng4, as played, to maintain any attack. Black did his best to disrupt the White pieces with moves like 20 ... h5 and 22 ... b5, but it was a lost cause. 

Sep1920   Walter Glattke: C) 19.Ne5 Qc7 20.Ng4 Rxe1 21.Nxf6+ Kh8 22.Qf5 seems to be the right answer, but stockfish always will be better than me, will have surely other moves here. 

Sep1920   Brenin: <WG>: C) 19 Ne5 Qd2, so that if 20 Ng4 Rxe1 21 Nxf6+ gxf6 22 Qxf6 then Black has Qd5+ 23 Kh3 Qe6+, forcing Qs off with material advantage. Alternatives 22 Bxf6 Qd5 or 22 Qg4+ Qg5 are no better for White. 

Sep1920   malt: First impression was 17.R:d7! R:d7
(17...N:d7 18.Q:f7+ Kh8 19.Ng4 R:e1 20.Nh6 Nf6 21.Q:c7 ) 18.Ng4 N:g4 19.R:e8 h5
(19...Nh6 20.Be5 )
20.h3
16...Nc5 looks stronger than 16...Bf8 

Sep1920   Walter Glattke: 19.Qd5 seems to be even better, while your line 19.Rd1 Nd5 20.Ne3 Qe6 wins a pawn for white, seem to be, as you said, always little white advantage after C) 18.Qxd7 

Sep1920   mel gibson: Too difficult for me.
Stockfish 12 says:
(17. Rxd7
(♖d1xd7 ♖d8xd7 ♘e5g4 ♘f6e4 ♖e1xe4 ♖e8xe4
♘g4f6+ g7xf6 ♕f3xf6 ♖e4d4 ♗b2xd4 ♖d7xd4 ♕f6xd4 b7b5 ♕d4g4+ ♔g8h8
♘c4e3 ♕c7d6 h2h4 h7h6 ♕g4e4 ♔h8g8 ♕e4f3 a7a5 ♕f3g4+ ♔g8h7 ♕g4f5+
♔h7g7 ♘e3g4 c6c5 ♕f5e4 c5c4 b3xc4 b5b4 ♕e4e5+ ♕d6xe5 ♘g4xe5 a5a4
♘e5d7 ♗f8e7 ♘d7b6 h6h5 ♘b6xa4 b4b3 a2xb3 ♗e7d8 c4c5 f7f6) +5.75/41
269)
score for White +5.75 depth 41 

Sep1920   Viking707: Wouldn't the white Q move 24, taking h5 have forced mate one move later (Qh8++)? instead, the choice to take the black Q extended the game longer than necessary. 

Sep1920   5hrsolver: <al wazir: Where's the win after 18...Rxe1 ? If 19. Nxf6+, then Kh8 20. Nxd7 Qxd7, and black is still an exchange up.> <latebishop: After 18.Rxe1 19.Nxf6 + Kh8 White seems to have 20.Qf5 g6 21.Qxd7 leaving him with two knights for a rook.> 20...g6 opens up the diagonal for the bishop so something like this should win outright.
18...Rxe1 19. Nxf6+ Kh8 20. Qf5 g6 21. Nxd7+ Bg7 22. Qxf7 Bxb2 23. Qf8# 

Sep1920   malt: Missed out 18.Ng4 R:e1 19.N:f6+ Kh8
(19...gf6 20.Qg4+ Bg7 21.B:f6 )
20.Qf5 g6 21.N:d7+ Kg8
(21...Bg7 22.Q:f7 )
22.Qf6 

Sep1920
  Predrag3141: Today's puzzle is White to play on move 17. I didn't see any future in 17 Rxd7 Rxd7, because 18 Ng4 completely escaped my attention. 

Sep1920   5hrsolver: After 17. Rxd7 Rxd7 18. Ng4 I knew White will have some kind of an attack going. But I was more interested in pursuing the line after 17... Nxd7 17. Rxd7 Nxd7 18. Qxf7+ Kh8 19. Ng4 (intending to go to h6) Rxe1 20. Nh6 (threatening Qg8#) Nf6 21. Qxc7 Rd7 22. Qf4 and white should win with material advantage and an attack on kingside. 

Sep1920
  chrisowen: rd7 daddy long legs no? 

Sep1920   Brenin: <5hrsolver>: You're right: after 18 ... Rxe1 19 Nxf6+ Kh8 20 Qf5 g6 21 Nd7+ Black can interpose on e5 (with Q or R), f6 or g7, or play Kg8, but all lead to mate in a few moves, e.g. 21 ... Kg8 22 Qf6 Re5 23 Ncxe5 Bg7 24 Qxf7+ Kh8 25 Qe8+ Bf8 26 Qxf8#. In fact, after 18 ... Rxe1 19 Nxf6+ Kh8 (19 ... gxf6 20 Qxf6 is no better) 20 Qf5 it's a forced mate: apart from useless spite checks, Black's only alternative defence to 21 Qxh7# is 20 ... gxf6 21 Qxf6+ Kg8 22 Qh8#. 

Sep1920   cormier: RandomVisitor: Black should have left the epawn alone on move 10: Stockfish_20091507_x64_modern:
<39/45 04:22 +0.16 10...Be6 11.Qe2 00> 12.Nc4 Bxc4 13.Qxc4 Rfe8 14.a4 Rab8 15.Qe2 b5 16.Ne1 Nc5 17.Nd3 a5 18.Bc3 Nxd3 19.Qxd3 b4 20.Bb2 Bc5 

Sep1920
  agb2002: The pawn on f7 is defenseless. This suggests 17.Rxd7: A) 17... Rxd7 18.Nxd7
A.1) 18... Rxe1 19.Nxf6+
A.1.a) 19... gxf6 20.Qg4+ Bg7 (20... Kh8 21.Bxf6+ Bg7 22.Qxg7#) 21.Bxf6 Kf8 22.Qxg7+ Ke8 23.Ne5 Rxe5 (23... Qd6 24.Qxf7#) 24.Bxe5 wins a piece and a pawn. A.1.b) 19... Kh8 20.Qf5 g6 (20... gxf6 21.Qxf6+ and mate next) 21.Ne8+ Bg7 (21... f6+ 22.Qxf6+ Kg8 22... Bg7 23.Qf8# 23.Nxc7 wins) 22.Bxg7+ Kg8 23.Qf6 Rxe8 24.Bh6 wins (24... Qe5 25.Nxe5). A.2) 18... Qxd7 19.Rd1
A.2.a) 19... Qe7 20.Bxf6
A.2.a.i) 20... gxf6 21.Qg4+ Bg7 22.Rd7 Qe4+ 23.Qxe4 Rxe4 24.Rxb7 wins a pawn. A.2.a.ii) 20... Qxf6 21.Qxf6 gxf6 22.Rd7 Re7 (22... Re2 23.Rxb7 Rxc2 24.Rxa7 wins a pawn) 23.Rxe7 Bxe7 24.Na5 wins a pawn. A.2.b) 19... Qe6 20.Bxf6 gxf6 (20... Qxf6 21.Qxf6 transposes to A.2.a.ii) 21.Na5 with the better game (21... Rb8 22.Qf4 Qe5 23.Qxe5 fxe5 24.Rd7). B) 17... Nxd7 18.Qxf7+ Kh8 19.Ng6+ hxg6 20.Rxe8 Rxe8 (due to 21.Qxg7#) 21.Qxe8 wins a pawns at least with the better position. 

Sep1920   5hrsolver: <Viking707: Wouldn't the white Q move 24, taking h5 have forced mate one move later (Qh8++)? instead, the choice to take the black Q extended the game longer than necessary.> If instead of 24.Qxf7
24. Qxh5 Qf5 25. Qh8+ Kf7 26. Qxf8+ Kxg6 27. Qxf5+ Rxf5 Black will be up the exchange. At least there is no checkmate on h8. 
