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Apr2719
  Chessdreamer: A slightly different version given by Razuvaev in Chess Informant 27/527; <1.d4 e6 2.Nf3 Nf6 3.c4 d5> 4.Nc3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bc4
cxd4 8.exd4 Be7 9.OO OO <10.Re1 Nxc3 11.bxc3 b6 12.Bd3 Bb7> transposing to our score. 

Apr2719   Walter Glattke: 16.Nxe6 fxe6 17.Bxh6 Rf7 18.Bg6 Qe8 19.Re3 Bf6 20.Rg3 Kf8 21.Re1 Bxh2 22.Bg5 Ke7!? 23.Bxf6 gxf6 24.Bxf7 Qxf7 25.Qh6 white wins. 

Apr2719   spazzky: Engine says Qc7 saves black
1) +1.44 (20 ply) 16.Nh7 Qc7 17.Bxh6 gxh6 18.Qxh6 f5 19.c4 Nxc4 20.Rxe6 Bxe6 21.Nxf8 Rxf8 22.Qxe6+ Kg7 23.Bxc4 Qd6 24.g3 Qxe6 25.Bxe6 Kf6 26.d5 f4 27.Kg2 Ke5 28.Rh1 f3+ 29.Kh3 Bb4 

Apr2719   goodevans: I went with the Nsac <16.Bh7+ Kh8 17.Nxf7+ Rxf7 18.Bg6>. This looks promising but fails to the spectacular <18...Rxf2!>. click for larger viewIf white tries to plough on with his attack with <19.Bxh6> black can stop it with <19...Rxg2+ 20.Kf1 Rxg6>, whilst after <19.Kxf2 Bxh4+ 20.g3 Qf6+> black also thwarts white's attack. 

Apr2719   schachfuchs: I would have tried 16.Nh7 but was not sure about black's reply. It's interesting that after 16...Re8?! SF10 exactly follows the game line 17.Bxh6 gxh6 18.Qxh6 f5 19.Re3 Bxh4 20.Rg3+ Bxg3 21.Qg6+ Kh8 22.Nf6 Bh2+ 23.Kh1 Qxf6 24.Qxf6+ and then gives a)24...Kh7 25.Bxf5+ exf5 26.Qxf5+ Kg7 27.Qg5+ Kf8 29.Qxd5 Bc7 (+8.9) b)24...Kg8 25.Kxh2 b1)25...Reb8 (+11.5) b2)25...Rac8 (+15.6) b3)25...Rad8 (+15.7) 

Apr2719
  Dionysius1: Very nice. A familiarlooking starting position, with some standard elements to the solution sparked off by a new one on me  17. Nh7, opening up lots of lines. 

Apr2719   Cheapo by the Dozen: Who knew that Black's DSB was overloaded? I didn't see that at all. I focused my attention on Nxf7, but Black as long as Black doesn't get greedy for material he seems to be fine. 

Apr2719
  Willber G: Unusually for a Saturday I got this. Back when I played regularly I favoured the Colle and tactical attacks like this were not uncommon. 

Apr2719   Walter Glattke: I am not interested in 16.Nh7 Bxh4 17.Nxf8 Qf6 18.Be3 Rxf8, I prefer white initiative with 16.Nxe6 (fe6 see above) 16.Bxe6 17.Rxe6 fxe6 18.Bxh6 Qe8 19.Bg6 Rf7 (or viceversa Rf7 before Qe8) 19.Bg5 Bf6 20.Qh7+ Kf8 21.Re1 Bxg5 22.hxg5 Rc8 23.d5 e5 22.f4 Rxc3 23.Rxe5 Qxe5 24.fxe5
White Advantage, so as it is after 16.fxe6 above. 

Apr2719
  FSR: Hard to analyze the position exactly, but I would also have played 16.Nh7 Re8 17.Bxh6. The position cries out for a sacrifice. 

Apr2719   goodevans: <Walter Glattke> In many lines in today's puzzle the play is far from forced. For the lines in each of your posts there are important alternatives you haven't explored. To be honest, an exhaustive analysis would be beyond me too, but I do feel that in each of your posts you've missed one or two of the more obvious ideas. In your second post I think you underestimate the strength of <16.Nh7>. After your <16...Bxh4> white needn't be in such a hurry to take the R. After all, the N on h7 is covering f6 and g5 which are important squares in several lines. The game shows how ...Re8 doesn't give good prospects so instead of the immediate capture, the B sac <17.Bxh6> is screaming to be played. Now if <17...Re8> white has <18.Qg4 Bf6 19.Nxf6+ Qxf6 20.Bg5> winning the queen. click for larger viewWhat if black delays saving his R until after accepting the sac? After <17...gxh6 18.Qxh6 Re8 19.g3> black has no good retreat for his B. click for larger viewOf course there are many alternatives for black that don't involve moving the R (too many for me to analyse) but my point is that 17.Bxh6 needs to be considered before 16.Nh7 can be so readily dismissed. Back in your first post, after <16.Nxe6 fxe6 17.Bxh6> you didn't consider <17...Bxh4> (ironic, as 16...Bxh4 was the only move you analysed after 16.Nh7!). click for larger viewIn this line this move comes with a threat to f2. There are many options to be analysed for both sides but I don't think you can rightly espouse the virtues of 16.Nxe6 without such analysis. 

Apr2719   wtpy: There are, as others have noted, a lot of defensive options, but they seem to trend favorably to white. I saw many of the lines and would have played 16 Nh7 followed by 17 Bh6 so am giving myself credit for the day. I am 6/6high cotton. I predict tommorow will be a bear. 

Apr2719   Patriot: <goodevans> <I went with the Nsac <16.Bh7+ Kh8 17.Nxf7+ Rxf7 18.Bg6>. This looks promising but fails to the spectacular <18...Rxf2!>> Wow! 18...Rxf2 is the kind of move that makes Chess hard! I went with 18.Qxf7 Kxh7 19.Bxh6 Kxh6 20.Re5 thinking 20...Bg5 which looks bad for black. But I missed 20...g6! and white is busted. It makes me think good practice would be spending a great deal of time on how to reply to threats so simple moves like this would become more obvious. 

Apr2719
  agb2002: The first idea that comes to mind is 16.Nh7 Re8 17.Bxh6 A) 17... gxh6 18.Qxh6 (the knight prevents the defensive moves Qf6 and Qg5) A.1) 18... Bxh4 19.Re3
A.1.a) 19... f5 20.Rh3
A.1.a.i) 20... Be7 21.Qg6+ Kh8 22.Nf6#.
A.1.a.ii) 20... Kf7 21.Rxh4 recovers the piece with an extra pawn and keeps the attack. A.1.b) 19... f6 20.Qg6+ Kh8 21.Nxf6 wins (21... Re7 22.Qh6+ Rh7 23.Qxh7#). A.2) 18... f5 19.Re3
A.2.a) 19... Kf7 20.Qh5+ Kg7(8) 21.Rg3+ wins.
A.2.b) 19... Bxh4 20.Rh3 transposes to A.1.a.
A.2.c) 19... f4 20.Qg6+ Kh8 21.Nf6 wins.
A.3) 18... f6 19.Qg6+ as in A.1.b.
B) 17... Bxh4 18.Bg5 Bxg5 19.Nxg5 Qd7 20.Qh7+ Kf8 21.Qh8+ Ke7 22.Qxg7 Rf8 23.Bg6 Qe8 24.Nxe6 Bxe6 25.Rxe6+ Kxe6 26.Re1+ wins decisive material. 

Apr2719   Patzer Natmas: I saw the knight move but didn't see the spectacular finish. I feel victorious with one right move heheh. 

Apr2719
  Breunor: Stockfish on 16 Nxe6:
1) =0.00 (22 ply) 16...fxe6 17.Bxh6 Bxh4 18.f4 Rf5 19.Bxf5 exf5 20.Bg5 Bxg5 21.fxg5 Nc6 22.g6 Qf6 23.g4 Nxd4 24.Qh7+ Kf8 25.Qh8+ Bg8 26.cxd4 Qxd4+ 27.Kh1 Qxg4 28.Re6 Qf3+ 29.Kg1 Qg3+ 30.Kh1 Qf3+ 

Apr2719   Captain Hindsight: Best defense after 16.Nh7 is <16... Qe8 17. Nxf8 Qxf8> click for larger view and you still have to squeeze the win out of him. 

Apr2719   Walter Glattke: Goodevans: third diagram 17.Bxh4?? 18.Bh7+ Kh8 (Kxh7?? Bg5+ and BxQ) 19.Be3 threatens Bg6 and Qh7# why should I attack here with black? 

Apr2719   Walter Glattke: I see: 18.Kxh7 19.Bg5+ Kg8 20.Bxd8 Bxf2+ 21.Kh2 Bxe1 22.Rxe1 Raxd8 23.Re3 Rf2 24.Rg3 Nc4 damned difficult, that Chess! 

Apr2719
  whiteshark: Razuvaev has analysed this game in his book <Key Concepts of Gambit Play>, Quality Chess, 2016, on pages 147+148.* The game was awarded a <brilliancy prize>. *game #29 

Apr2719   Ron game: I finally got a Saturday 

Apr2719   cormier: click for larger viewAnalysis by Houdini 4 d 22 dpa done
1. = (0.24): 15...Rc8 16.Bf4 Bd5 17.Re3 Bd6 18.Bxd6 Qxd6 19.Nh7 Rxc3 20.Nxf8 Kxf8 21.Bb5 Rc2 22.Qe5 Qxe5 23.dxe5 Rb2 24.Bf1 Nc6 25.a3 g6 26.Rc1 Kg7 27.Be2 Nd4 28.Bd3 a5 29.Rc7 Ra2 30.Be4 Nb5 2. + / = (0.31): 15...Qe8 16.Bf4 Bd5 17.Bh7+ Kh8 18.Nxe6 fxe6 19.Bg6 Qxg6 20.Qxg6 Rxf4 21.Rxe6 Bxe6 22.Qxe6 Ba3 23.Re1 Raf8 24.Re2 R4f7 25.Qg6 Rc7 26.Qg3 Rcf7 27.Qd3 Rc7 28.Re3 Kg8 29.Qe2 Nc4 30.Re8 Nd6 31.Qe6+ Rcf7 32.Rxf8+ Kxf8 33.g3 Re7 34.Qd5 Re1+ 35.Kg2 3. + /  (0.84): 15...Qd7 16.Nf3 f5 17.Bxh6 Bxf3 18.gxf3 Bf6 19.Bf4 Rfe8 20.Rac1 Qd5 21.Kg2 Nc6 22.a3 Ne7 23.a4 Red8 24.Re2 Rf8 25.Rce1 Rac8 26.Rxe6 Rxc3 27.Rd6 Qa2 

Apr2719   cormier: click for larger viewAnalysis by Houdini 4 d 22 dpa done
1. + / = (0.60): 15.Nh7 Qc7 16.Nxf8 Kxf8 17.Qe2 Rd8 18.Bd2 Bxh4 19.Be4 Be7 20.Rad1 Bd5 21.Bxd5 Rxd5 22.Qf3 Rf5 23.Qa8+ Qd8 24.Qxd8+ Bxd8 25.g4 Rb5 26.Rb1 Rd5 27.Bc1 Nc4 28.Kg2 h5 29.Rb4 b5 2. = (0.20): 15.Qh5 Rc8 16.Bf4 Bd5 17.Re3 Bd6 18.Bxd6 Qxd6 19.Rae1 Rc7 20.Nh7 Rfc8 21.Nf6+ Kf8 22.Nxd5 Qxd5 23.Re5 Qd8 24.Ba6 Nc4 25.R5e4 Qd5 26.Qg4 Re8 27.Qg3 Qd6 28.Rf4 Kg8 29.Kh2 Rd8 30.Rg4 g6 31.Bxc4 Qxg3+ 32.Kxg3 Rxc4 

Apr2719   cormier: click for larger viewAnalysis by Houdini 4 d 22 dpa done
1. + / = (0.37): 14...Bxg5 15.Bxg5 Qd5 16.Qg4 f6 17.Bc1 f5 18.Qg3 Rac8 19.Bf1 Qc6 20.Bg5 Rf7 21.h5 Nc4 22.Bf4 b5 23.h6 g6 24.Rab1 Na3 25.Rb4 Nc2 26.Bxb5 Qxc3 27.Qxc3 Rxc3 2. + / = (0.43): 14...g6 15.Qg4 h5 16.Qg3 Bd6 17.Nxe6 Bxg3 18.Nxd8 Bxf2+ 19.Kxf2 Rfxd8 20.Bd2 Bd5 21.Re5 Kg7 22.Re7 a6 23.Rae1 Rac8 24.Ra7 Bxa2 25.Bxa6 Ra8 26.Rxa8 Rxa8 27.Ra1 Be6 28.Bd3 Rc8 29.Rb1 Nb3 30.Be1 Ra8 31.Rb2 Ra1 

Apr2719   cormier: click for larger viewAnalysis by Houdini 4 d 22 dpa done
1. = (0.00): 13...Rc8 14.Ng5 h6 15.Qh5 Na5 16.Bf4 Bd5 17.Bh7+ Kh8 18.Bb1 Kg8 19.Bh7+ Kh8 2. + / = (0.30): 13...Qd7 14.Qc2 h6 15.Qe2 Na5 16.Ne5 Qd5 17.Qg4 h5 18.Qg3 Bxh4 19.Qh3 Rac8 20.Be4 Qd8 21.Ba3 Re8 22.Bb4 Qf6 23.g3 Bxe4 24.Rxe4 Bg5 25.Qxh5 Qf5 26.Nxf7 Be7 27.Qxf5 exf5 28.Rxe7 Rxe7 29.Bxe7 Kxf7 30.Bb4 Nc4 31.a4 a5 32.Ba3 Nxa3 33.Rxa3 Ke6 34.Kg2 


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