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| Nov-07-14 | | patzer2: With my pick of 28. Nf6+! for the Friday puzzle, it's five in a row I've solve this week. Got as far as 28. Nf6+! Nxf6 29. Bg5  to  . Didn't expect a Queen sacrifice with the desperado 29...Nxg4, but it doesn't appear to give White much, if any, difficulty. |
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| Nov-07-14 | | plumbst: Difficult. Material is even.
Black's kingside is fragile and White's pieces are primed for attack but he must break open the shell. The g5 pawn is crucial for holding it together, so 28.Nf6+!
Interfering with the Queen's defense of the g5 pawn and also attacking the other defender, the h7 Knight. 28...Qxf6 drops the Queen.
28...Kh8 29.Nxh7 Kxh7 30.Bxg5 f6 31.Bxh4.
28...Nxf6 29.Bxg5 Nxe4 30.Bxe4.
28...Bxf6
29.Rxf6! Nxf6
30.Bxg5 Nxe4
31.Bxe4 f6 (32...Qc7 33.Bf6)
32.Bxf6 Qc7
33.Qg5+ Rg7 (33...Kf8 34.Qh6+)
34.Bh7+! Kh8 (34...Kxh7 35.Qh5+)
35.Qh5 Ree7 (35...Qd7 36.Bg6+; 35...Rf8 36.Bf5+)
36.Bxg7+ Rxg7 (36...Kxg7 37.Qg6+ mates)
37.Rf8+ Rg8 (37...Bg8 38.Bxg8+)
38.Bxg8+ Kg7
39.Bxe6 Kxf8
40.Qh8+ Ke7
41.Qg7+ Kd8 (otherwise Qxc7)
42.Qf8# |
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| Nov-07-14 | | TheBish: Ivanchuk vs Radjabov, 2011 White to play (28.?) "Difficult", material is even.
One thing to notice is that Black's Nc6 is undefended. But after looking for a way to exploit that and finding none, I decided that White is geared up for a kingside attack, and found a way to exploit the weakened kingside pawns, specifically g5 (but also h4 if g5 goes). 28. Nf6+!! Bxf6
The knight move looks crazy at first, but after a little inspection, it becomes clear that for a modest investment (exchange for a pawn), White develops a lethal attack. If Black opts to avoid this line, White will either win the crucial g5 pawn or the exchange (rook for knight). If 28...Nxf6 29. Bxg5, and thanks to the nasty pin, White nets a pawn. 29. Rxf6 Nxf6
This isn't forced, but if Black declines the exchange, Bxg5 is coming anyway. So Black must pick his poison! 30. Bxg5 Qe7
This seems pretty forced, anticipating Bxf6 and Qh6 with certain mate if Black's last move isn't played. 31. Bxf6 Qf8 32. Qg5+ Kh7 33. e5! Nxe5
The knight was attacked, as well as Be4+ threatened, so this looks forced. If instead 33...Ne7 (hoping for 34. Be4+ Ng6), White plays 34. Bxe7 Rexe7 35. Be4+ f5 36. exf6+ Kh8 37. Nf4! (even 37. fxe7 Qxf1+ 38. Ng1 should win, but Nf4! is crushing) and White has too many threats, mainly Ng6+. 34. Bxe5! dxe5 35. Be4+ f5 36. gxf5
Also good is 36. Rxf5 Bxf5 37. Bxf5+ Kh8 38. Bxd7.
36...Kh8
Hoping for 37. fxe6 Qxf1+.
37. f6 Bg8
The threat was 38. Qh5+ Kg8 39. Rg1+.
38. Qh5+ Rh7
Or 38...Bh7 39. f7!.
39. Bxh7 Bxh7 40. Rg1 Rf6 41. Rg7 and Black must give up the queen to stop mate, i.e. 41...Qxg7 42. fxg7+ Kxg7 43. Qxh4 with an easy win. |
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| Nov-07-14 | | gofer: Black has a pawn on f7 and a big pawn on e6. If we can keep these
two where they are for a while and remove Nh7 and Bg7, then we
can attack the king. So first things first, remove one defender
on Pg5 and not allow Bxd5 and threaten Nxe8 and Nxd7 and also do
that without losing tempo...
<28 Nf6+ ...>
28 ... Kh8
29 Nxh7 Kxh7
30 Bxg5 Qc8 (f6 31 Bxf6 Bxf6 32 Rxf6 )
31 Bf6
28 ... Nxf6
29 Bxg5
28 ... Bxf6
29 Rxf6 Nxf6
30 Bxg5
Either way we win Pg5 due the pin on Qd8, probably cement our
bishop or rook on f6 (with any luck) and then give mate by
bring our queen to h6 or g5... ...well that's the plan... ~~~
Hmmm, well I "saw" Nxg4, but didn't really think it was an option, but
I doubt I would have been able to find the beautiful combinations that
followed. I probably would have struggled in the Q+R+N+B v 2B+2R+N middle-game... |
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| Nov-07-14 | | Cheapo by the Dozen: Material is dead even, and not hanging on either side. I presume the solution starts 28 Rf5. If Black doesn't play ... f6, White is apt to get a pawn or two for the exchange, as well as having broken the position open. If Black does play ... f6, material is more like a rook for 2 or 3 pawns, but White also has a promising pin on what will be an f6 knight. However, I haven't worked things through at all.
It feels like there should be an e5 break in the mix, but that would probably have to be solely to clear e4 for the bishop, since ... Nxe5 would seem to clean up the other potential benefits of the break. |
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| Nov-07-14 | | agb2002: The material is identical.
The knight on h7 looks overburdened because it defends f6 and g5. This suggests 28.Nf6+, trying to cause an interference amongst the black pieces: A) 28... Nxf6 29.Bxg5 and the pinned knight and the pawn on h4 are lost. For example, 29... Ne7 30.Bxf6 Bxf6 31.Rxf6 Ng6 32.Qg5 Kh7 33.Nf4 Rg8 34.Nxg6 Rxg6 35.Qxh4+ Kh7 36.Rxg6+ fxg6 37.Qxd8 Rxd8 38.g5 + - [2P]. B) 28... Bxf6 29.Rxf6
B.1) 29... Nxf6 30.Bxg5
B.1.a) 30... Qe7 31.Bxf6 Qf8 32.Qg5+ Kh7 33.Qxh4+ Qh6 34.Qf2 and White has two pawns for the exchange and threatens Ng3-h5-f6. B.1.b) 30... Qe7 31.Rxf6
B.1.b.i) 31... Ne5 32.Rh6 f6 (32... Qf8 33.Bf6 Ng6 34.Qg5 Qg7 (else 35.Rh8#) 35.Bxg7 Kxg7 36.Nf4 + -) 33.Bxf6 with many threats (Bxe7, Qg5+, etc.) wins. B.1.b.ii) 31... Qf8 32.Bh6 Qxh6 (32... Qe7 33.Qg5+ Kh7(8) 34.Qg7#) 33.Qxh6 + - [Q+P vs R]. B.1.c) 30... Ne7 31.Bf6 Qc7 32.Qh6 and mate next.
B.2) 29... Qe7 30.Bxg5 Qf8 (30... Nxf6 transposes to B.1.b) 31.Rh6 and White will win a second pawn while keeping the attack. C) 28... Kf8 29.Nxh7+ wins.
D) 28... Kh8 29.Nxe8 wins the exchange and the pawns on g5 and h4 later. |
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| Nov-07-14 | | morfishine: A clear pattern or theme is not readily apparent;
However, control of one vital sqaure <f6> is
enough to force a winning position
<28.Nf6+> 28...Bxf6 29.Rxf6 Nxf6 30.Bxg5 (1) 28...Nxf6 29.Bxg5 recovering the piece and I don't see how Black
defends against the threat 30.Rxf6
*****
<Cheapo by the Dozen> 28.Rf5 is an interesting try ***** |
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| Nov-07-14 | | gofer: <http://www.chessvideos.tv/chess-puz...> give this POTD every so often, and has again today. Hort vs Chandler, 1982
White to move. <25 ?> 
click for larger viewThis really is a beauty! Obviously incredibly simple, maybe a <Tuesday> level, but the combinations available to white - if black tries to defend rather than capitulate immediately - are really quite fun... |
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| Nov-07-14 | | patzer2: Playing it out move-by-move with Fritz 12 gives <28. Nf6+ Nxf6> If 28... Bxf6, then 29. Rxf6 Nxf6 30. Bxg5 Kg7 31. Qf4 Bf5 (31... Qc7 32. Bxf6+ Kh7 33. Qg5 Rg8 34. Qh5#; 31... Rg8 32. Bxf6+ Kf8 33. Bxd8 ) 32. Qxf5 Re6 33. Nf4 Re5 34. Bxf6+ Kg8 35. Bxe5 Nxe5 36. Nd5 (+13.16 @ 20/40 depth). <29. Bxg5 Nxg4 30. Bxd8 Nxf2+ 31.
Rxf2 Rdxd8 32. Qg5> (+4.12 @ 20/43 depth). P.S.: The not-so-obvious move allowing the winning combination here was 27...g5?, but even after the Fritz best play suggestion of 27...Na5 28. Qd3  Black still has a difficult position. |
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| Nov-07-14 | | patzer2: If Black tries 29...Nxe4 (diagram below), White has a long winning combination.
click for larger viewHere, after 28...Nxe4, play might continue 30. Bxe4 Qc7 31. Bf6 Ne5 32. Qg5 Ng6 33. Bxg7 Kxg7 34. Rf6 Qc5 35. Rxg6+ fxg6 36. Qxg6+ Kh8 37. Qxe8+ Bg8 38. Rf8 Rg7 39. Rxg8+ Rxg8 40. Qf7 Rg7 41. Qf8+ Rg8 42. Qh6#. |
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| Nov-07-14 | | goldenbear: I never looked at Nf6+. I was too focused on Rf5, which I was unable to refute or prove a win. |
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| Nov-07-14 | | kevin86: I had no idea on this one. Nice conclusion by white! |
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| Nov-07-14 | | M.Hassan: "Difficult"
White to play 28.?
Sides are equal.
I spotted that if White sacs his Knight on f6, he is likelyy to get it back: 28.Nf6+ Bxf6
29.Rxf6 Nxf6
30.Bxg5
Now Bisho pinns the Knight and can capture it plus the pawn on h4: 30........Qc8
31.Bxf6 Kh7
32.Qg5 Rg8
33.Qxh4+ Kg6
34.Nf5#
Time to check
=============
The game line is way different. 29...Nxg4 never occured to me |
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Nov-07-14
 | | Jimfromprovidence: If anyone gets this line, a condensed version of something <notyetagm> posted back in 2011, they should be getting paid to play chess. 28 Nf6+ Bxf6 29.Rxf6 d5 30.exd5 Nxf6 31.Bxg5 Rxd5 32.cxd5 Bxd5 33.Nf4 Bxg2+ 34.Qxg2 Qd6 35.Bxf6 Qxf6 36.Nd5 
click for larger view
It takes 17 ply to get to a clear winning position.
Here, there is really nothing black can do to prevent 37 Nf6+. |
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| Nov-07-14 | | JohnBoy: The combination itself was not all that tough. What I don't get is why black resigned at this point (rather than, say, a move or two earlier). What I see is 41...Re8 42.Bxc8 Rxc8 43.h4 and the h pawn gets shoved down black's throat, supported by the timely Qf5 with entry on the white squares. Maybe it was just that the time-control had been reached and the Chuckster no longer had the clock as enemy. |
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Nov-07-14
 | | scormus: As soon as I saw White (Ivanchuk) I knew there was no way I'd get this. I thought maybe 28 Nf6 but not much further into the labyrinth. And I also wondered about 28. Rf5. So just decide enjoy it, a genuine Chuky special. This is an example of <sevenseaman: ... like him plucking the stars for the most beautiful woman in his life> |
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Nov-07-14
 | | Penguincw: I got 28.Nf6+. :) |
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| Nov-07-14 | | Cheapo by the Dozen: For some reason I miscalculated and didn't see anything emerging from Nf6. Total whiff on the puzzle today. |
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| Nov-07-14 | | thegoodanarchist: <sevenseaman: <Vishy>'s assessment that <Chuky> is impulsive is spot-on. When <Chuky> is brilliant its like him plucking the stars for the most beautiful woman in his life. Then on another day, he is like a glass of insipid, flat beer.> Think I will have a cold one now... |
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| Dec-27-24 | | mel gibson: I chose the same first ply but I couldn't tell if it was a good move. Stockfish 17 says:
28. Nf6+
(28. Nf6+ (1.Nf6+ Bxf6 2.Rxf6 d5 3.exd5 Nxf6 4.Bxg5 Rxd5
5.cxd5 Bxd5 6.Nf4 Bxg2+ 7.Qxg2 Qd6 8.Bxf6 Qxf6 9.Nd5 Qe6 10.Nc7 Qe5 11.Nxe8
Qxe8 12.Qd5 Kf8 13.Qf5 Ne7 14.Qh7 Qc6+ ) +4.37/45 436) score for White +4.37 depth 45. |
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Dec-27-24
 | | chrisowen: I gen cad its wup jah its x v Nf6 its ha its coffin abe its leeway its dub its chi ada na abled its axled its Nf6 buff |
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Dec-27-24
| | chrisowen: Thee I follow Nf6 |
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| Dec-27-24 | | stacase: I parted company and would have moved 32.Rf4. I couldn't see what Black was going to do about it. |
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| Dec-27-24 | | vajeer: I saw the weakness on g5 and quickly saw the combination thinking "not so difficult". Then saw SF analysis where it comes up with a clever 29...d5 defense. After 28...Bxf6 29. Rxf6 d5 30. exd5 Nxf6 31. Bxg5 Rxd5 32. cxd5 Bxd5 we get to this key position
click for larger view
Here I think only 33. Nf4 keeps the advantage. I feel this makes it a difficult puzzle. |
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| Dec-27-24 | | King.Arthur.Brazil: The king didn't find many options, this time. Hearing to the "dificult" theme: 28. Nf6+ (Nxf6 29. Bxg5) Bxf6 29. Rxf6 Nxf6 30. Bxg5 with a very unpleasant pin. |
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