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| Sep-11-16 | | diagonalley: hardly "insane", but a beautiful attack nonetheless |
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| Sep-11-16 | | Caissas Clown: <diagonalley: hardly "insane", but a beautiful attack nonetheless>
My thoughts exactly.I suppose the Q sac is fun,but it was quite simple.
If I can solve on a Sunday , it's not insane ! |
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| Sep-11-16 | | Doniez: Sad 15th anniversary. |
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| Sep-11-16 | | drollere: Attention immediately goes to e6 ... 2 pawns for a knight, a linked passed pawn and a busted K redoubt. What then? Ne4 attacking Q and Rc1? Only inroad I could find is pretty routine ...
26. Nxh7, Kxh7
27. Rd3, Bg7
28. Rh3, Kg8
I didn't like Ng8 at all at first, black's problem is the bishop not the rook. But the point is Bxf6, exf6 still blocks e7 escape. f5 is a discouraging development for sure. |
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| Sep-11-16 | | AlicesKnight: I was with <An Englishman> with a view to removing the Black KB and f5 for the Q, so way off... very pretty; there doesn't seem to be enough room in the R-file bottleneck to get enough attacking force through but White solves the problems. |
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| Sep-11-16 | | Cheapo by the Dozen: I went with a wholly different plan: an immediate Qf2/Q4, followed by trying Nxe6 as a waystation to Nxf8. Black can try to stop that with ... h6 and ... Rxc5, however, and it's not immediately clear how material shakes out. Note also that the h4 queen and f6 bishop are pointed at Black's e7 knight, once White's g5 knight has captured at e6. |
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| Sep-11-16 | | YouRang: Insane Sunday 26.?
click for larger view
This position does have kind of an "insane" look to it. White does have some firepower near black's king -- both pieces and pawns. I'm thinking there's a tactic to break up black's defense and get our Q into the attack. Perhaps first a little pawnstorm of <26.f5> to (1) open a diagonal for our queen, and (2) attack Pg6.
click for larger view
To keep his king defense intact, I'd expect <26...exf5>, and then <27.e6>.
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Our extremely well protected Pe6 is now attacking Pf7. White has some nasty attack in view if black allows exf7, since blakc's kingside defensive pieces can be traded off and we can play Qh6 and still have our Nc5 and Re1 to join the attack. I don't think black wants to counter with ...fxe6, which allows Ngxe6, with threat of Nxf8, which will allow Qh6, which looks like death. What can black to to stop exf7? Not much. Perhaps <27...Ne4>, which blocks or Ne1 and threatens our DSB. But then we can trade it off with <28.Bxe4>, and I think we still have a good attack with threatened with exf7, but it's fuzzier. ~~~~~
Checking with the computer, I'm almost surprised that this 26.f6 idea holds water, although not quite as much as the played 26.Nxh7!, which frankly never crossed my mind. |
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| Sep-11-16 | | stacase: <YouRang: ...26.Nxh7!, which frankly never crossed my mind.> Chess is funny that way, I'm pretty much a wood pushing patzer yet 26.NXh7 was the first and pretty much the only move I considered. Go figure! |
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| Sep-11-16 | | patzer2: When I first glanced at today's Sunday puzzle position (26. ?), I thought this looks "easy." "All I have to do is demolish the h-pawn with 26. Nxh7 and then swoop in for a decisive attack on the open h-file." I got the first move and the general idea right, but my execution and follow-up was terribly wrong. My poor plan was 26. Nxh7 Kxh7 27. Qe3? which gives a winning advantage to Black after 27...Ng8 28. Qh3+ Bh6  to  (-1.69 @ 21 depth, Deep Fritz 15). I suppose the "insane" aspect of today's Sunday puzzle is that after 26. Nxh7 Kxh7, the only winning follow-up is not with the Queen, who is usually the star attraction in a Kingside attack, but rather with a lesser piece (i.e. the the Rook) playing the lead role after the winning follow-up 27. Re3! As the combination progresses 27... Ng8 28. Rh3+ Nh6 29. f5 Qxa2, the Queen, who so badly wanted top billing in this drama, is forced to take an early exit by sacrificing herself with 30.Qxh6+!, leaving the Rook to be the star of the show after 30...Bxh6 31. g5  (diagram below) 
click for larger viewFrom here, the Rook confidently rides into our finale with guns blazing to execute mate-in-five with 31...Ne2+ 32.Kh1 Ng3+ 33.hxg3[] Kg8 34.Rxh6[] Qxg2+ 35.Kxg2 gxf5 36.Rh8# or 31...Kg8 32.Rxh6[] Ne2+ 33.Kh1 Ng3+ 34.hxg3[] Qxg2+ 35.Kxg2 gxf5 36.Rh8#. P.S.: The tactical theme in today's Sunday combination solution 26. Nxh7! Kxh7 27. Re3! is <putting pressure on the pinned piece.> To the occasional annoyance of their parents and grandparents, my young grandsons, after watching the Chess instruction video https://www.chesskid.com/article/vi..., refer to this tactic as <PP on the PP.> My seven-year-old grandson put a little pressure on some teens and adults in a tournament in central Texas yesterday, winning two and drawing one in to take third place in the under 1300 section of a four round Saturday swiss. His one loss was a close contest against the highest rated player in the section. |
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| Sep-11-16 | | Pawn Slayer: Didn't see enough follow up to Nxh7, so instead went for f5, which looks like it will lead to a very nasty attack. After exf5, e6 looks like it leads to a position I would not want to defend as black. Someone with a computer will doubtless tell me I'm wrong, but.....! |
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| Sep-11-16 | | patzer2: Black's not-so-obvious decisive mistake was 25...Nc3?, allowing 26. Nxh7! . If he could have seen it coming, Black should have defended with 25...Qb6! = (0.14 @ 18 depth, Deep Fritz 15) since 26. Nxh7 is no longer decisive as Black holds after 26..Kxh7 27. Re3 Ng8 28. Rh3+ Nh6 29. f5 exf5 30. Qxh6+ Bxh6 31. g5 Kg8 32. Rxh6 Qxf6 33. exf6 Nxd4 = (0.00 @ 20 depth, Deep Fritz 15). |
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| Sep-11-16 | | patzer2: <Pawn Slayer> The computer seems to like your 26. f5!  idea. It's not quite as strong as 26. Nxh7 , but as you indicate it makes the game very difficult for Black. Dmitry Svetushkin - Valentin Economescu, Astral Open Bucharest ROM 2001
click for larger viewAnalysis by Fritz 15 (21 depth):
1. (1.20): 26...Rxc5 27.dxc5 Qxc5+ 28.Kh1[] Bh6 29.fxe6 fxe6 30.Nxe6[] Bxd2[] 31.Nxc5[] Bxc1 32.Rxc1[] Kf7 33.Na6 Rc8[] 34.Nxb4 d4[] 35.Nd5 Nexd5[] 36.Bxd5+ Kf8 37.Kg2 Rc5 38.Bc4 Nd5 39.Kf3 Ne3 40.Ke4 Nxc4 41.bxc4 Ra5 2. (2.36): 26...exf5 27.e6[] Ne4 28.Bxe4 dxe4 29.Nd7 Nd5 30.Be5 Ra8 31.gxf5 f6 32.Nxf8 fxe5 33.Nxe4 Qd8 34.fxg6 Bxg6 35.Nxg6 hxg6 36.Rcd1 Nf4 37.dxe5[] Qxd2 38.Rxd2 Nxe6 39.Rd6[] Nc5 40.Rxg6+ Kf7 41.Rf6+[] Ke7 |
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| Sep-11-16 | | WorstPlayerEver: Board looks crowded, but insane..? No. |
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| Sep-11-16 | | mel gibson: A great game - black has no defense even if he doesn't take the knight. |
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| Sep-11-16 | | agb2002: Only the c-pawns have been traded.
Black threatens the a-pawn.
The first idea that comes to mind is 26.Nxh7 to open the h-file: A) 26... Kxh7 27.Qf2
A.1) 27... Bg7 28.Qh4+
A.1.a) 28... Kg8 29.Re3
A.1.a.i) 29... Bxf6 30.exf6 Qd8 31.g5 followed by Rh3 wins. A.1.a.ii) 29... Rxc5 30.Rh3 Ne2+ 31.Kf2 Rxc1 32.Qh7+ (or 32.Qh8+ Bxh8 33.Rxh8#) 32... Kf8 33.Qxg7#. A.1.b) 28... Bh6 29.Re3 Ng8 (due to 30.Qxh6+ and mate next) 30.g5 (30.Rh3 Ne2+ 31.Kh1 Nxf4) with the plan Rh3, Qxh6+ and mate in two. A.2) 27... Rxc5 28.Qh4+ Bh6 29.Re3 is similar to previous lines. A.3) 27... Bh6 28.Qh4 looks similar to previous lines. B) 26... Qxa2 27.Rc2 folowed by Nxf8 seems to weaken decisively the black castle. C) 26... Bg7 27.Ng5
C.1) 27... Bxf6 28.exf6 Nc6 29.Qf2 Qd8 30.Qh4 wins. C.2) 27... Nc6 28.Qf2 followed by Qh4 and Qh7 is winning. I'm eager to see what I have missed. |
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| Sep-11-16 | | YouRang: (Note to self) A good take-away from this game is to recognize the potential of the R+B mate, especially if the king's primary escape square (f7 in this case) is solidly sealed (in this case by the Pf7 pawn, blocked by the attacking bishop). The point is that under such conditions, the R+B mating attack is persistent. This affords the attacker an "extra" tempo to set up the mate (in this case, having time to play Re3 *after* the knight sac, to set up Rh3+/Rh8#). It still doesn't afford the attacked king time to mount an adequate defense. I suppose what made this puzzle tricky (fit for Sunday) is that white also had to see that the R+B attack by itself actually wasn't sufficient. It needed the additional coordinated support of the queen, Pf4, and Pg4. These extra resources makes the attack feasible whether black defends with ...Ng8 (as in the game) or ...Bg7, or ...Bh6. |
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| Sep-11-16 | | agb2002: 27.Qf2 seems to be significantly weaker than the direct 27.Re3 according to Stockfish. |
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| Sep-11-16 | | drollere: i didn't consider f5 immediately because of Bh6, pinning the N. i'm also temperamentally wary of a pawn thrust that can be captured 2 or more ways ... have i really run down every variation? R's and N's are hard to visualize -- N's because two moves from now they can be almost anywhere else on the board, and R's because their paths aren't straight lines but corners. the open third rank for the e R was what made Nxh7 look feasible and dangerous. just as a style point, usually a position like the puzzle comes from two players who prefer to chip away at each other (for example, Q+N for a peasly rook pawn). and Nh7 is a chip. |
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Sep-11-16
 | | Jimfromprovidence: FWIW, I'm having problems if 29...Qa3.
click for larger viewNow 30 Qxh6+ exposes white to ...Qxc1+.
I figure to move the rook somewhere but I am not sure how to proceed. |
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| Sep-11-16 | | patzer2: <Jimfromprovidence> After 29...Qa3, the computer pick is 30. Rc2 Ne2+ 31. Qxe2 (9.23 @ 23 depth, Stockfish 6). |
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Sep-11-16
| | Jimfromprovidence: <patzer2> <After 29...Qa3, the computer pick is 30. Rc2 Ne2+ 31. Qxe2 (9.23 @ 23 depth, Stockfish 6).> Thanks. Now I have to figure out why that works. |
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| Sep-11-16 | | Jacob Arnold: Fairly easy compared to most Sunday puzzles in my opinion. The rook lift and queen sacrifice ideas jumped out at me immediately for some reason. |
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| Sep-11-16 | | RandomVisitor: Black is pretty much lost even one move back from today's puzzle: after 25.Ng5 there is little he can do
click for larger viewKomodo-10.1-64bit:
<+2.04/33 25...Qb6> 26.Kh1 h6 27.f5 hxg5 28.Qxg5 exf5 29.e6 Rb7 30.Qh4 Bg7 31.Bxe7 fxg4 32.exf7+ Bxf7 33.Rf1 Nc3 34.Nxb7 Qxb7 35.Qxg4 Re8 36.Bf6 Re6 37.Bxg7 Kxg7 38.Rce1 Rxe1 39.Rxe1 Nxa2 40.Qg5 Nc3 41.Re7 Qb6 42.Qe5+ Qf6 43.Rxa7 Qxe5 44.dxe5 Kf8 45.Rb7 Na2 46.Rd7 d4 47.Bd5 Bxd5+ 48.Rxd5 Ke7 49.Rxd4 Ke6 50.Rd6+ Kxe5 51.Rxg6 Nc3 52.Kg2 Kf5 |
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| Sep-11-16 | | patzer2: <RV> Thanks for the analysis of 25...Qb6. Looks like Komodo 10.1 @ 33 depth easily trumps Deep Fritz 15 @ 18 to 20 depth. Still I think 25...Qb6 was the best practical try as the precise winning Komodo line 26.Kh1 h6 27.f5! hxg5 28.Qxg5 exf5 29.e6! is not so easy for a human to find OTB. P.S.: So what does Komodo 10.1 show as the saving move(s) for Black. |
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| Sep-12-16 | | nalinw: Yes - I was only trying to get the Queen on the h file - not seeing how strong it was on the diagonal. |
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Kibitzing
sac: 26.Nxh7
