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Sep0218
  agb2002: The bishop on d4 xrays the black king. This invites to play 19.Bxd5. For example, 19... Bxd5 20.Nxd5 exd5 21.e6+ f6 (21... Kg8 22.Rxh7 looks winning, for example 22... Bxg5+ 23.Rxg5 Kxh7 24.Rh5+ gxh5 25.Qxh5+ Kg8 26.Qh8#) 22.Qh5 gxh5 23.gxf6+ and mate in three. However, a number of Black's answers require attention at any point of the calculation: Qf4+, Qxg3, Nd3+, Bxg5+, etc. I don't have time for more. 

Sep0218   Walter Glattke: 19.Bxd5 Rad8 20.Bxe6 Rxd4 21.Rxd4 Bxg5+
24.Kb1 Nxe6 /20.Bb3 Bxg5+ 21.Rxg5 Rxd4
white advantasge 

Sep0218
  whiteshark: <Lovuschka: <I saw the first moves, but not 22.Qh5. But, of course, once the move is played, it is all obvious. That is, if you don't see the zwischenzug with check on d3. Great play by White! >>
Me too! 

Sep0218   Afhammouda: I think 19 Nxd5 is a blunder as black must reply with 19 .. Nxb3+ and white loose 

Sep0218   catlover: What <Lovuschka> and <whiteshark> said. This puzzle deserves the four stars. 

Sep0218   onedog: Mayankk: I got the idea behind d5 sacrifice to clear the long diagonal via an e6 later. However I had Nxd5 first followed by Bxd5. Does it make a difference? Yes it does because black replies 19.Nxb3 with check and then takes on d5 with the bishop, so he isn't forced to move the epawn. 

Sep0218   Strelets: What a performance by White. A model demonstration of the attacking resources available to the first player in one of the sharpest antiSicilian lines. Take motifs from puzzles and games like these and use them in your own. 

Sep0218   Walter Glattke: 19.Bxd5 Bd5 20.Nxd5 Nd3+ 21.Qxd3 exd5 22.e6+ Kg8 23.Rxh7 Bxg5+ 24.Rxg5 Qf4+ 25.Be3! / 22.f6 23.Rxh7+ Kxh7 24.Rh3+ Kg7 25.Rh6 Rh8 26.Qxg6+ Kf8 27.Qf7# 

Sep0218
  Jimfromprovidence: Great match, but does 19...b4 spoil white's plans? click for larger view 

Sep0218   5hrsolver: Great puzzle. Got the first two moves but was floored by 22. Qh5. 

Sep0218
  AylerKupp: Interestingly, from the position after 19.Bxd5
click for larger viewStockfish 9 does not consider 19...Bxd5 as played in the game (and the seemingly most natural move, at least to me) to be among Black's top 3 replies. Instead, at d=38 Stockfish considers 19...b4 as Black's best move, evaluating the resulting position as White almost standing clearly better at [+0.99] after 19...b4 20.Bxc5 bxc3 21.Bxe7 Qxe7 (the apparently obvious 21...cxb2+ would probably transpose into the analysis line after 22.Kb1 ) 22.Bb3 Rac8 23.Kb1 cxb2 24.Qd2 Kg8 (a seeming loss of time, without a White DSB Black's king could stay at g7 without worrying about a possible discovered check, and indeed Black's king soon returns to g7) 25.Qb4 Qxb4 26.Rxb4 Rc7 27.Kxb2 Rfc8 28.Rd3 Kg7 29.Rbd4 h6 30.h4 Rc5 31.f4 a5 32.Bxe6 fxe6 (I'm curious how 32...Rxc2+ followed by 33...R8c7 would have turned out) 33.Rd7+ Kf8 34.Rxb7 Rxc2+ 35.Kb3 h5 36.Rh7 R2c4 37.Rh8+ Ke7 38.Rxc8 Rxc8 39.a3 Rc1 40.Rc3 Ra1 41.Rc7+ Kd8
click for larger viewThis looks to me like a winning position for White. White is a pawn up and his command of the 7th rank will prevent Black's king from joining the action. His rook can either decimate Black's kside pawns faster than Black can do the same for White's or White can defend his fpawn and go after Black's weak apawn. Restarting the analysis from this position Stockfish evaluates the resulting position at d=39 as winning for White, with an evaluation of [+3.20] after 42.Rg7 Rf1 43.Kc4 Rxf4+ 44.Kc5 Ke8 45.Kd6 Rxh4 46.Kxe6 Kf8 47.Rxg6 Ra4 48.Rf6+ Kg7 49.Rf3 Rg4 50.Kd7 Rd4+ 51.Kc6 Re4 52.Kd5 Re1 53.e6 Kg6 54.Kd6 Rd1+ 55.Kc7 Re1 56.Kd7 Rd1+ 57.Ke8 h4 58.e7 Kg7 59.Rf7+ Kg8 60.Rf4 h3 61.Rf6 Kg7 62.Rh6 Rd3 63.a4 Re3 64.Kd7 Rd3+ 65.Rd6 So what about 32...Rxc2+ instead of 32...fxe6?
click for larger viewProbably not much different of an outcome. At d=41 Stockfish evaluates the resulting position as White standing clearly better, [+1.11], after 33.Kb3 a4+ 34.Ka3 fxe6 35.Rd7+ Kg8 36.Rxb7 hxg5 37.hxg5 Rf2 38.Rb4 Kf8 39.Rh3 Rcc2 40.Rb8+ Kg7 41.Rbh8 Rf3+ 42.Rxf3 Kxh8 43.Kxa4 Rxa2+ 44.Kb3 Ra1 45.Rd3 Kg8 46.Kc3 Rf1 47.Rd4 Kf7 48.Kd3 Rd1+ 49.Ke4 Re1+ 50.Kf3 Rf1+ 51.Ke2 Rh1 52.Rd7+ Kf8 53.Ra7 Rh3 54.Rb7 Ra3 55.Rd7 Rh3 56.Rd3 Rh1 57.Kf2 Rb1 58.Kf3 Kf7 59.Ke3 Re1+ 60.Kf2 Rb1 So I can hardly fault Gonzalez for playing 19...Bxd5 in an incredibly complicated position; the merits between 19...b4 and 19...Bxd5 are hard to determine. And, yes, Stockfish at d=33 evaluates the resulting position as White having a decisive advantage, [+3.43], after 19...Bxd5 20.Nxd5 Qb7 21.Nxe7 Qxe7 22.Qf3 Nd7 23.Qf6+ Qxf6 24.exf6+ Kg8 25.Rh6 Rfc8 26.Rgh3 Nf8 27.b4 e5 28.Bc5 Rxc5 29.bxc5 Rc8 30.Ra3 Ne6 31.Rxa6 Nxg5 32.Rh4 h5 33.c6 Nf3 34.Re4 Nxh2 35.Rxe5 Ng4 36.Rxb5 Nxf6 37.c7 Kg7 38.Rc6 Ne8 39.Rb7 h4 40.Rc3 h3 41.Rxh3 Rxc7 42.Rxc7 Nxc7 43.Kd2 Nd5 44.Rb3. But note that Stockfish does not allow the discovered check after 19.Bxd5 Bxd5 20.Nxd5 exd5 21.e6+, preferring instead 20...Qb7 instead of 20...exd5 as in the game. After 20...exd5 21.e6+ Stockfish considers Black's (relatively) best reply to be 21...Kg8, evaluating the resulting position at d=39 as White having a clear advantage and likely winning, [+12.52], after 21. ... Kg8 22.Rxh7 Qf4+ 23.Qe3 Qxe3+ 24.Rxe3 f6 25.Rxe7 Rfe8 26.Bxc5 Rxe7 27.Bxe7 f5 28.Kd2 Re8 29.Bb4 d4 30.Re1 d3 31.c3 Kg7 32.b3 Rc8 33.Bd6 f4 34.c4 Re8 35.c5 a5 36.c6 Kg8 37.Rc1 Rxe6 38.c7 Re8 39.c8Q Rxc8 40.Rxc8+ Kf7 41.Bxf4 Ke6 42.Kxd3 Kf5 43.Rf8+ Ke6 44.Rf6+ Kd7 45.Rxg6 Kc8 46.Ra6 Kb7 47.Rxa5 Kb6. In contrast, after the game continuation 21...f6, Stockfish evaluates the resulting position as effectively lost for Black, [+54.07], after 21. ... f6 22.Qh5 Nd3+ 23.Kb1 gxh5 24.gxf6+ Kh8 25.fxe7+ Ne5 26.exf8R+ Rxf8 27.Rxh5 Rxf2 28.Bxf2 Nc6 29.Rhg5 h6 30.Rg6 Kh7 31.Be3 Qxg3 32.Rxg3 h5 33.Bd4 Kh6 34.Bc5 h4 35.Rc3 Kg6 36.e7 Nxe7 37.Bxe7 Kf5 38.Ra3 d4 39.Rxa6 h3 40.Rb6 Ke4 41.Rxb5 d3 42.cxd3+ Kxd3 43.Rg5 Ke3 44.Rg3+ Kd4 45.Rxh3 Kd5 46.Kc2 Ke6 47.Rh7 Kf5 48.Rh4 Ke6 49.Bb4 Kf7 50.Rh5. So, of Black's two mistakes while the game was possibly still in doubt, 19...Bxd5 and 21...f6, the second was the worse one as far as Stockfish is concerned, although it doesn't make any practical difference. Black is apparently lost in either case. 

Sep0218   Walter Glattke: I thought for queen sac and gxf6, not exf6 and Qxg3: 20.Qf3 bxc3 21.Qf6+ Bxf6 22.gxf6+ Kh8 23.Rh6 Nd3+ 24.Kb1 Nxe5 25.R3h3 Nxf6 26.Bxf6 and mate next 

Sep0218   cormier: click for larger viewAnalysis by Houdini 4
<15...d5> 16.Rh4 Qxe5 17.Qg4 Bb7 18.Qh3 Nxb3+ 19.axb3 Qf5 20.Qxf5 exf5 21.Rd4 Bc5 22.Rd3 d4 23.Bxd4 Bd6 24.h4 b4 25.Ne2 Rfe8 26.Be3 Bh2 27.Re1 f4 28.Bd2 a5 29.Rd7 Bc8 30.Rd3 g6 31.Nd4 Rxe1+ 32.Bxe1 Kg7 33.Bd2
= / + (0.40) Depth: 24 dpa 

Sep0218   Walter Glattke: Really merciless with 19.b4 20.Qf3 Kh8!?
21.Bxc5 Bxd5 24.Nxd5 exd5 25.Bxe7 Qxe7
26.Rh6 Qxe5 27.Qf6+ Qxf6 28.gxf6 Rfe8 R3h3 mating 

Jan1021
  wtpy: I got the game line through 21 ..f6 but did not see 22 Qh5; instead I would have played Rgh3, which is also winning, but not as decisively. Black shouldn't take the bishop on d5. I thought the best line was 19 ...Rad8 but Olga likes 19 ...h5 and only gives white a slight edge. 

Jan1021
  Jambow: Honestly I got the first 5 moves in blitz mode... I think i could have found the continuation after that but I couldn't possibly have examined the branches until the end? I think I see a promising continuation using some intuition and pull the trigger. Do any other players here do that or am I just lazy in my approach? Anyway I do believe i could have likely won his game using my methods and as i said the initial 5 or 6 moves were begging to be played. Nice puzzle. 

Jan1021   Walter Glattke: 22.Qh5 is the surprise 22.gxf6 Bxf6 23.Bxf6+ Rxf6 24.R3h3 Rh8 25.e7 Re6, but 22.Qh5 gxh5!? 23.gxf6++ Kf7 24.Rg7+ Ke8 25.Rxe7+ Qxe7 26.fxe7 leads to a won rook ending with Ph2, 

Jan1021   Walter Glattke: After 22.Nd3+ 23.Kb1 Kh8 white can play 24.f7+? Ne5 25.Rxh5 Bf6 26.R3h3 Kg7! in the match could follow 27.Qg7 28.Rxg7 Kxg7 29.Bxe5+ Kg6 30.Rh3 Rxf2 31.b3 Re2 32.Bf4 Rxe6 33.Rh6+ Kf5 34.Rxe6 Kxe6 (B and 4P against 4P) 

Jan1021   Brenin: I got 19 Bxd5 and the next few moves, though I was troubled by the fact that Black can just ignore the capture of the dpawn, e.g. 19 ... b4 (see Ayler Kupp's posting from Sep0218 for this response). I certainly didn't foresee 22 Qh5, and I raise my hat to anyone who did, though having got there one might well see that it allows the Q to join in the attack at last. 

Jan1021
  agb2002: Level 4: 19...?
E Delmar vs Lasker, 1892
click for larger view 

Jan1021
  chrisowen: Humour me vim hop quicks bxd5 ghost acrid mod vim a basins banals 1 in humour me kip rod winds vim binds vim quaint fatty taj jaffy it is cello its karp gait evict doses with conjoin i jazzy vim add tot eve it i hives black cinch jaffa it was eg choir bxd5 che it ce; 

Jan1021
  chrisowen: A little light headed fast no x 

Jan1021   mdz: White had to see the line 23...gxh5 24. gxf6+ Kh8 25. fxe7+ Ne5 26. exf8=Q+ Rxf8 27. Rxh5 Rxf2 28. Rxe5 Rf1+ 29. Re1+ 

Jan1021   RandomVisitor: Here are the top 6 black responses after 19.Bxd5: click for larger view Stockfish_21010817_x64_modern:
52/75 3:15:54 +1.83 19...Rh8 20.Bxb7 Qxb7 21.b4 Na4 22.Ne4 Qd5 23.Nd6 Rhc8 24.Qe4 Qxe4 25.Rxe4 Rc6 26.c4 bxc4 27.Rf4 Rf8 28.Ra3 Bxg5 29.Be3 Bxf4 52/73 3:15:54 +2.36 19...b4 20.Bxc5 bxc3 21.Bd6 Qd8 22.Bxb7 Bxg5+ 23.Kb1 Bxh4 24.Rxc3 Qg5 25.a4 Rad8 26.Ka2 Qf4 27.Qxa6 Qxh2 28.a5 Bxf2 29.Qe2 Qg1 51/81 3:15:54 +2.60 19...h5 20.Bxc5 Bxd5 21.Bxe7 Qxe7 22.Nxd5 exd5 23.Rd4 Qe6 24.Rgd3 Rad8 25.a3 Rd7 26.Rc3 a5 27.Rc5 Rb8 28.f4 b4 29.a4 b3 51/73 3:15:54 +3.54 19...Na4 20.Qg4 h5 21.gxh6+ Kh7 22.Bxb7 Qxb7 23.Ne4 Qc6 24.Rd3 Rac8 25.Rd2 Nb6 26.Bxb6 Qxb6 27.Rh3 Qa5 28.Nd6 Rc5 29.Ra3 Qb6 51/76 3:15:54 +3.60 19...Rac8 20.Bxc5 Bxd5 21.Nxd5 exd5 22.Bd4 Bc5 23.Rgh3 h5 24.gxh6+ Kh7 25.Rf4 Qe7 26.Kb1 Bxd4 27.Rxd4 Rc4 28.Rxd5 Qe6 29.Rhd3 Qf5 51/72 3:15:54 +3.66 19...Rad8 20.Bxc5 Bxd5 21.Bxe7 Qxe7 22.a3 Rc8 23.Qe3 Rc4 24.Rxc4 bxc4 25.Qd4 Qb7 26.Nxd5 Qxd5 27.Qxd5 exd5 28.Kd2 h6 29.gxh6+ Kxh6 

Jan1021   RandomVisitor: After 18...d5 the machine likes 19.f4 followed by 20.f5: click for larger viewStockfish_21010817_x64_modern:
<57/88 9:53:46 +2.76 19.f4 Rh8 20.f5> gxf5 21.Qh5 Kf8 22.Kb1 Ke8 23.a3 Qd8 24.Bxc5 Bxc5 25.g6 fxg6 26.Rxg6 Kd7 27.Rf6 Kc7 28.Rxe6 d4 29.Nd1 Rc8 <57/85 9:53:46 +1.64 19.Bxd5 Rh8> 20.Bxc5 Bxc5 21.Bxb7 Qxb7 22.Ne4 Be7 23.Rgh3 Rad8 24.c3 b4 25.c4 a5 26.Kb1 Rd4 27.Qf3 Qd7 28.Nd6 Rxd6 29.exd6 Qxd6 Note that Stockfish thinks 19...Rh8 is the top black response to 19.Bxd5. In the game 19...Bxd5 was played, where black can improve with 20...Qb7 as previously suggested by <AylerKupp>: click for larger viewStockfish_21010817_x64_modern:
<59/80 9:26:59 +6.37 20.Nxd5 Qb7> 21.Nxe7 Qxe7 22.Qf3 Nd7 23.Rgh3 h5 24.gxh6+ Kh7 25.Rg4 Rac8 26.Rhg3 Nb8 27.h4 Nc6 28.h5 Nxd4 29.Rxd4 Rg8 30.Qd3 Rc7 


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