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| Feb-08-15 | | Cheapo by the Dozen: White is up a pawn. Black's mating threat starting with ... Bg2+ would leave White one free tempo to defend. Ra7 looks difficult for Black to deal with, with one potential followup being Ng6+/Ne7+ In a speed game I'd surely try
42 Ra7+ Qb6
43 Ng6+ Kg8
44 Ra6 (Q moves)
45 Rxc6
Assuming that a Sunday puzzle can't be nearly that easy, I'm probably at the moment overlooking some Black defense or counterplay. |
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Feb-08-15
 | | An Englishman: Good Evening: A defensive brilliancy! I can only claim half-credit--saw the first two moves, but thought that White would only succeed in salvaging a "miraculous" draw. |
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| Feb-08-15 | | mike1: I think " Bright1" is right. Rublewski's 43.Qa7 could be countered by f5! 44.Bf5 Rxg2 and it is all over. |
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| Feb-08-15 | | devere: <mike1: I think " Bright1" is right. Rublewski's 43.Qa7 could be countered by f5! 44.Bf5 Rxg2 and it is all over.> It certainly would be "all over" after 45. Qh7# |
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| Feb-08-15 | | mistreaver: Sunday. White to play. 42. Insane?
Black has a nasty pressure against g2 square.
White has two ways to prevent it: Ra7 or Rxc6
First let's see what would happen after Ra7:
42 Ra7 Qb8
43 Ng6+ Kg8
44 Ne7+
Maybe black has something better then 42 ... Qb8?
42 ... Qb6
43 Ng6+ Kg8
44 Ne7+ Kh8
Also doesn't bring much joy.
42 ... Rxg2!
I "brilliantly" thought of this after seeing everything else most likely fails for black.
However
43 Rxb7 Rxh2+
44 Kg1 Rh1 is mate
43 Bxg2 Bxg2
44 Kg1 Ne2+
45 Kf2 Nxf4 disch
And it seems that whie king will perish since
46 Kg1 Nh3 is mate.
After convincing myself that attack on g2 is indeed dangerous i will stick to the second,
more radical way of dealing with that threat:
42 Rxc6 Qxc6
43 Qa7
This is my instinctive reaction. White queen knight and bishop have nice coordination.
After any move by black, say
43 ... Re8
44 Qf7 is quite strong. Or
43 ... Qe8 (To prevent Qf7)
44 Bf5 etc.
I think this gives white nice compensation and probably great attack.
i can't calculate all possible defences and find a direct knockout blow however.
Time to check and see.
---
Ok, first of all i was right about 42 Ra7, except that instead of 45 ... Nxf4, 45 ... Qb6ch wins in that variation.
Secondly i didn't even consider 43... Nd1, but it turns out that white can even take that knight:
44 Rxd1 Rc1
45 Qa8+ Kg7
46 Nf5+ Kh7
47 Qa7+ Qc7
48 Qxc7 Rxc7
With decisive material advantage.
And the text move also wins, but white could have even taken on c2 and won.
Imho not that hard for Sunday, i didn't see that insane move, i reckon the hardest part was to see why Ra7 doesn't work. |
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Feb-08-15
 | | al wazir: <bright1: 42. Rxc6 Qxc6 43. Ng6+ Kg8 44. Ne7+> Rxe7. |
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| Feb-08-15 | | agb2002: White is one pawn ahead.
Black threatens 42... Rxg2 (43.Rxc6 Rxh2+ 44.Kg1 Qg7+ mates in two). The knight check doesn't seem to go anywhere: 42.Ng6+ Kg8 and 43.Rxc6 Qxc6 44.Ne7+ fails miserably to 44... Rxe7. However, this suggests the possibility of attacking the black king with queen, bishop and knight after 42.Rxc6 Qxc6 43.Qa7, threatening Bf5 followed by Qh7#: A) 43... Re8 44.Bf5 Kg8 45.Bh7+ (or 45.Qh7 Kf8 46.Ng6#) and 46.Ng6# (an unusual mate pattern). B) 43... Ne4 44.Ng6+ Kg8 45.Qb8+ (surely better than 45.Ne7+) wins. For example, 45... Kf7 46.Qf8+ Kxg6 47.Qg8+ Kh5 48.Qg4#. C) 43... Nd5 44.Qf7 (44.Ng6+ Kg8 45.Qb8+ Re8 looks winnnig for Black) 44... Ne7 (44... Nxf4 45.Qf8+ Kh7 46.Bf5+ Ng6 47.Bxg6#) 45.Bf5 Qxg2+ (45... Nxf5 46.Ng6#) 46.Nxg2 Nxf5 47.Ra1 + - [Q vs R]. D) 43... Qe8 44.Bf5
D.1) 44... Re7 45.Qxe7 Qxe7 46.Ng6+ and 47.Nxe7 + - [B+P]. D.2) 44... Qg8 45.Ng6+ Qxg6 46.Bxg6 and mate soon.
E) 43... Nd1 44.Rxd1 Rc1 45.Qb8+
E.1) 45... Qc8 46.Qxc8+ (not 46.Bxc8 Rxd1#) 46... Rxc8 47.Bxc8 + - [B+N+P] E.2) 45... Kg7 46.Nf5+
E.2.a) 46... Kf7 47.Nxh6+ Kg6(7) (47... Ke7 48.Qd8#) 48.Qg8+ Kxh6 49.Qh8+ Kg6 50.f5+ Kg5 (50... Kf7 51.Qh5+ and 52.Qxe2 + - [B+2P]) 51.Qg7+ Kf4 52.Qg4+ Ke3 (52... Ke5 53.Qxe2+ + - [B+2P]) 53.Qg3+ Ke4 54.Qf3+ Ke5 55.Qxe2+ + - [B+2P]. E.2.b) 46... Kg6 47.Qg8+ Kh5 48.B(Q)g4#.
E.2.c) 46... Kh7 47.Qa7+ Qc7 (else mate soon) 48.Qxc7+ + - [B+N+P vs R]. E.3) 45... Kh7 46.Bf5+ Kg7 47.Qa7+
E.3.a) 47... Kf8 48.Ng6+ Kg8 (48... Ke8 49.Bd7+ Kf7 50.Bxc6+ Kxg6 51.Rxc1 wins) 49.Qb8+ Re8 (49... Qe8 50.Qxe8+ Rxe8 51.Rxc1 wins and if the king moves it is mate in two at most) 50.Qxe8+ Qxe8 51.Rxc1, threatening Rc8 and Rc7-Re7-Be6+ looks winning. E.3.b) 47... Kg8 48.Qh7+ Kf8 49.Ng6+ Ke8 50.Qg8#.
E.3.c) 47... Kh8 48.Qh7#. |
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| Feb-08-15 | | houtenton: <mistreaver> <Cheapo by the Dozen> I got this morning the same idea about Ra7 but unfortunate the chessgames system was blocked, so there goes my first price. 42 Ra7 Rxg2+
43 Bxg2 Bxg2+
44 Kg1 and Qb6! is even quicker! |
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| Feb-08-15 | | houtenton: <Edeltalent> thank you for your kind welcome words some problems ago. As I am from the Netherlands I wrote by force of habit dutch notation. From now on I try to use the englisch one. Since it will cost you a lot of time to be busy with the daily problems I will not be there every day. |
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| Feb-08-15 | | thegoodanarchist: <Phony Benoni: ...
The frustration of the rooks on 7th rank is palpable.> I read in a chess book a long time ago that doubled rooks on the 7th were often called pigs on the 7th. I had never heard that term before, and after I started going to chess tournaments regularly, I <still> rarely heard that term used. Maybe 3 or 4 times in dozens of tournaments in my life. I think the author of the book was just trying to get his chess slang popularized. |
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| Feb-08-15 | | Mating Net: Great Sunday puzzle, way above my pay grade. This puzzle/game really highlights the fine line between victory and defeat in chess. Black was very active and had counter play, but it wasn't enough. |
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Feb-08-15
 | | Jimfromprovidence: <agb2002> <42.Rxc6 Qxc6 43.Qa7, threatening Bf5 followed by Qh7#:> Ditto for me. I thought the main line would be one of the many you pointed out; 43... Nd1 44.Rxd1 Rc1 45.Qb8+.
click for larger viewWhite is in a pickle here with his pinned rook. The problem is how white avoids settling for a perpetual while maintaining his material advantage. Luckily his bishop and knight are in position to assist. If 45...Kg7 then 46 Nf5+ Kh7. This allows 47 Qa7+.
click for larger viewNow black has to trade queens and play 47...Qc7 to avoid mate. it's a similar situation if 45...Kh7. Then white has 46 Bf5+ Kg7 47 Qa7+, etc. 
click for larger view |
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| Feb-08-15 | | agb2002: <Jimfromprovidence: ...
White is in a pickle here with his pinned rook. The problem is how white avoids settling for a perpetual while maintaining his material advantage. Luckily his bishop and knight are in position to assist.> For a rather long while I thought that White would have to settle for perpetual until I realized that the rook on e2 was defenseless and an eventual Qxe2 with tempo would gain decisive material and defend the remanining rook. In my opinion the most difficult line was E.3.a, where White must sacrifice the queen and it gives the impression that refutes 42.Rxc6. However, R+B+N+P vs Q wins relatively easy, although not necessarily quickly due to the need of moves like h3 to avoid back rank problems, when one finds the possibility of creating a mating net with rook, bishop and knight so that White finally emerges one piece ahead with a won ending. |
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Feb-08-15
| | Jimfromprovidence: <agb2002>
<For a rather long while I thought that White would have to settle for perpetual until I realized that the <rook on e2 was defenseless> and an eventual Qxe2 with tempo would gain decisive material and defend the remanining rook.> I can't visualize that scenario coming out of your e line. |
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| Feb-08-15 | | agb2002: <Jimfromprovidence: <agb2002>
...
I can't visualize that scenario coming out of your e line.> I meant my line E.2.a.
After checking with Stockfish I have found that I missed a mate in one with 53.Qd4#. Too focused on that rook... |
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Feb-08-15
 | | gezafan: ,<thegoodanarchist: I read in a chess book a long time ago that doubled rooks on the 7th were often called pigs on the 7th. I had never heard that term before, and after I started going to chess tournaments regularly, I <still> rarely heard that term used. Maybe 3 or 4 times in dozens of tournaments in my life. I think the author of the book was just trying to get his chess slang popularized.> I think you're right. I've been playing chess a long time and I've never heard the term used. |
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| Feb-08-15 | | patzer2: Here's my look with Fritz 12:
<41...Qb7?> This is Black's decisive error. Instead, Black can hold with good drawing chances after 41... Ra2! 42. Rxa2 Rxa2 when play might continue 43. Qc1 Be4 44. Re1 Rc2 45. Qe3! Re2 46. Rxe2 Nxe2! 47. Bf5! (47. Qxe2 $4 Qc1+ 48. Qf1 Qxf1#) 47... Bxf5 48. Nxf5 Kh7 49. Nh4 Nxf4 50. h3 Kg7 51. Qe4 Qe5 52. Qb7+ Kh8 53. Qc8+  . <42. Rxc6!!> This initiates an extremely difficult and brilliant combination to solve our Sunday puzzle. My failed try was 42. Bf5?? which loses to 42...Bxg2+ 43. Kg1 Bd5! (not 43... Bxf1?? 44. Ra8+ Kg7 45. Ra7  ) when play might continue 44. Bxc2 Rxc2 45. Ng6+ Kg8 46. Rf2 Ne2+! 47. Kf1 Bc4 48. Ra8+ Kg7 49. Ra7 Rc1+ 50. Qxc1 Nxc1+ 51. Kg1 Qxa7  . <42... Qxc6 43. Qa7 Nd1 44. Bf5 Qc7 45. Qa8+ Kg7 46. Ng6 Nf2+ 47. Kg1> Not 47. Rxf2?? Rc1+ 48. Rf1 Rxf1#.
<47... Nh3+ 48. Bxh3 Qc4 49. Nh4 Qd4+ 50. Kh1 Qxf4 51. Nf5+ Kh7 52. Ng3 Rf2 53. Rg1 Qe5 54. Qa7+ Kg8 55.
Qd7 Kf8 56. Nf5 Qc7 57. Qe6?!> This move wastes time and risks letting Black back in the game. Strongest is 57. Qd4! when play might continue 57...Rxf5 58. Bxf5 Rc6 59. Rd1 Qe7 60. Qf4 Kg8 61. h4 . <57... Qe5!> Setting a trap for black, hoping for 58. Nxh6? Qxe6!  . <58. Qd7!> White avoids the trap and steers the game back toward the strong 57. Qd4! line he missed earlier. If 58. Nxh6? then 58...Qxe6! 59. Bxe6 Rb2 risks throwing away the win by giving Black drawing chances. <58... Qc7 59. Qd4!> This arrives at the clear winning position White could have had earlier with 57. Qd4! . <59...Qe5 60. Qd8+ Kf7 61. Qd7+ Kf8> If 61... Kg6, then 62. Qg7+ Kh5 63. Qxh6#.
<62. Qg7+ Ke8 63. Qg8+ 1-0> Black resigns in lieu of <<63...Kd7 64. Nd4+! >> when play might continue <<64...f5>> If 64... Kc7, then 65. Nxc2 Rxc2 66. Qc8+ Kb6
67. Qxc2 .
<<65. Qf7+ Kc8 66. Nxc2 Rxc2>> If 66... Kb8, then 67. Nd4 Qxd4 68. Qe8+ Kb7 69. Re1 Qd6 (69... Qd5 70. Re7+ Kb6 71. Qb8+ Kc6 72. Qb7+ Kd6 73. Qc7#) 70. Qf7+ Kc6 71. Rc1+ Kb6 72. Ra1 Qxb4 73. Qa7+ Kc6 74. Rc1+ Kd6 75. Qxf2 . <<67. Bxf5+ >> |
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| Feb-08-15 | | Edeltalent: 42.? White to play
The best idea I see is 42.Rxc6 Qxc6 43.Qa7, relieving pressure from g2 and going on the counter-attack with threats of Qf7-Ng6#, Nf5-Qg7# or Bf5-Qh7#. The active black pieces suddenly look clumsy and have trouble getting back to defend. 43...Qe8 44.Bf5 Re7 45.Qxe7 works well for White, maybe Black should try to flea with 43...Kg8 44.Nf5 Kf8. As I already played a complicated game today and "insane" indicates that there's much more left to figure out, I'm gonna leave it at that and only consume the thoughts of my fellow kibitzers who dove deeper into the variations. |
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| Feb-08-15 | | morfishine: Black has an uncomfortable buildup against <g2> I was able to discard <42.Ng6+> & <42.Ra7>, for either leading nowhere or being too slow; but couldn't decide if 42.Rxc6 or 42.Qa5 was best: (1) <42.Rxc6> 42...Qxc6 43.Ng6+ Kg7 44.Qa7+ Kxg6 45.f5+ Kg5 46.Qg7+ Kh4 47.Qxh6# or (A) 44...Kg8 45.Qb8+ Kf7 46.Ne5+ fxe5 47.fxe5+ Rf2 48.Rxf2+ Rxf2 49.Qa7+ Kg6 50.Qxf2 (2) <42.Qa5> 42...Rxg2 43.Rxc6 Rxh2+ 44.Kg1 Qxc6 45.Qd8+ and White breaks in *****
<Phony Benoni> You don't attempt Sunday Puzzles? I always try even though my success rate for Sunday is no more than 1 out of 4. I've found that post-mortem analysis of Sunday Puzzles improves my pattern recognition and tactics, which in turn helps me solve the other Puzzles! ***** |
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| Feb-08-15 | | Diabolicaal: Even a knight on the rim can have his day!
I have one question. Is it fair to assume that Rublevsky saw this to the end from move 42 on? If so, that is INSANE! |
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| Feb-08-15 | | Overgod: I found this pretty easy. Took me about 2 minutes to decide definitively that taking the bishop on c6 was approaching "only move" territory for white -- if not being the only move. If that bishop isn't taken, White's king looks to be toast. So it's a defensive move in that respect. On the other hand, it deflects the queen and allows Qa7 followed by a king side attack on the black monarch. I'd consider this medium difficulty, rather than 'insane.' |
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| Feb-08-15 | | abuzic: Rxc6 was there, few moves earler:
click for larger view
38.?
38.Rxc6 Qxc6 39.Qa7 Kg8 40.Qxe3
click for larger view
39.?
39.Rxc6 Qxc6 40.Qa7 Rd7 41.Ng6+ |
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| Feb-09-15 | | gofer: All of black's pieces are beautifully organised in attack, but the same cannot
be said for its defense. The rooks and queen are not able to easily join up if
the queen gets deflected from its current position b7. <42 Rxc6 Qxc6>
<43 Qa7! ...>
White still has 3 pieces protecting Pg2, but black's defences are very thin
on the ground, only Re2 defends the back rank with its queen to prevent regicide! 44 Ng6+ Kg8
45 Qb8 Kf7/Kg7/Kh7
46 Qf8+/Qh8+ Kxg6
47 Qg8+ Kh5
48 Qg4#
The full frontal attack fails...
43 ... Rxg2 43 Bxg2 Rxg2 44 Nxg2 ...
So black must play something safe, but what?
Slow moves get punished very quickly...
43 ... Re8/Nd5/f5
44 Qf7
43 ... Qe8
44 Bf5
43 ... Ne4
44 Ng6+ Kg8
45 Qb8+
43 ... Kg8
44 Ng6 ...
...this transposes to the solution below due to the attacks failing
as follows...
44 ... Qxg2+
45 Bxg2 Rxg2
46 Qa8+ Kf7/Kg7/Kh7
47 f5! Rxh7+
48 Kg1
44 ... Rxg2
45 Ne7+ Kf8
46 Nxc6
The <tricky> Nd1 threatens Nf7+ mating! So white has to be
careful...
<43 ... Nd1!>
click for larger view44 Ng6+ Kg8
45 Qb8 Re8
46 Ne7+ Kf8
47 Nxc6 Rxb8
48 Nxb8 Nf7+
49 Kg2 Nxh3+
50 gxh3
I think black's "best" result is going a piece down... ~~~
Hmmm, well I got the first 2 moves for both players, but missed the other 20! |
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| Feb-09-15 | | gofer: Now, a little late, I realise that
42 Rxc6 Qxc6
43 Qa7 Nd1
44 Ng6+ Kg8
45 Qb8+ ...
instead of
45 ... Re8
46 Ne7+ Kf8
47 Nxc6 Rxb8
48 Nxb8 Nf7+
49 Kg2 Nxh3+
50 gxh3
click for larger viewBlack has to choose
45 ... Qe8
46 Qxe8 Rxe8
47 Rxd1
click for larger viewWhite has R+B+N+4P against 2R+3P, which should be a win for
white. Probably not a quick win that the likes of Fritz and
Stockfish are looking for, but a win still the same... |
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Feb-09-15
 | | Phony Benoni: <morfishine> I don't know if it's possible to solve Sunday puzzles. In fact, I don't know if Rublevsky "solved" this one. It's hard to believe he saw everything from move 42 on ahead of time. Or maybe he did, and I just have no conception of what a great player is capable of. No doubt everything you say about working on Sunday puzzles is true, but that sort of thing is no longer important to me. And really never was. I rarely spent as much as 15 minutes on a move, preferring to proceed on intuition, blind faith in suspect chess judgment, and sheer laziness. Led to some success over the board, but it doesn't solve puzzles. If I didn't enjoy solving Sunday puzzles in my games, why should I waste time doing so here when I could be spending the entire day trying to track down the playing schedule at the 22nd Western Championship at Cleveland in 1921? (Believe me, the Sunday puzzle was easier.) Joking aside, I hark back to Tarrasch's crack about happiness in chess coming from what is usually translated as "intellectual productivity". Some get their IP from solving puzzles. Some never leave the Opening Explorer. Some don't progress beyond trolling. And the wisest among us do anything but research chess history. This is supposed to be productive, after all. |
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Kibitzing
sac: 42.Rxc6