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Gadir Guseinov vs Sergey Fedorchuk
Qatar Masters (2014), Doha QAT, rd 6, Dec-01
Sicilian Defense: Kan. Knight Variation (B43)  ·  1-0
ANALYSIS [x]

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Jan-05-16  dumbgai: Pretty straightforward. Black either gets mated immediately like in the game, or loses the queen after 37...Kg8 38. Nf6+ Qxf6 39. exf6 (and black will soon be mated anyways).
Jan-05-16
Premium Chessgames Member
  Penguincw: First Tuesday puzzle of the year.

When I first saw this puzzle, I thought, wow, this is easier than yesterday's. Just take a bunch of times on h7, and Arabian Mate! But then there's the rook on c7, which is a a pest.

A huge pest, as you can't even bring your rook over to the c-file.

I ended up going with 37.Qxg5, which when clicking on "e8", is actually the first choice by the engine. After 37...Rc2 38.Rxh7+ Qxh7 39.Nxg7 Bxg2+ 40.Kg1 Bxf1 41.Kxf1 Kxh7, white has a queen and pawn vs. rook and knight, which are separate from the king. Looks like a win, might take some time.

Alternatively is 40.Qxg2 Rxg2 41.Kxg2 Kxh7, and white has a rook and pawn vs. knight.

Man, this week's puzzles are hard. 2016...

For anyone who actually thought this was easy and wants a "bonus" puzzle, I saw on <cg> a puzzle that could be the Tuesday puzzle, and being the person I am, tried to solve it before it was released, but I ended up looking like a fool. But anyway, solve this puzzle (may not be Tuesday strength):

Black to move, 29...?


click for larger view

J Barle vs I Jelen, 1979

Jan-05-16  dfcx: A very unusual Tuesday puzzle.

White is already ahead by an exchange and almost any reasonable white move wins: Qxg5, Nxh7 or even Rh5 and black can't do anything about it.

Jan-05-16  lost in space: 37. Nxh7 and no defense. The queen on f7 is overworked. She can not protect mate on h7 and f8

37. Nxh7 Qxh7 38. Qf8#
or

37. Nh7 Qg7 38. Qxe6 Qxh7 39. Qf6+ Rg7 40. Rxh3+ Kxh3 42. Qxf5 with material plus for white.

Jan-05-16  roentgenium: First Tuesday puzzle of the year :). The Black Queen on f7 defends against Qf8#. Therefore, 37. Nxh7 is a safe pawn win, and also threatens 38.Nxg5+ (which also covers the f7 escape square). Subsequently, the threat of 39.Qh8 leads to mate or significant loss of material for Black.

I initially failed to see that 37...Qg7 is a defensive try. However, there follows 38.Nf6+ (the key being that this blocks g8 as a King escape square) Qxh6 39.Rxh6+ Kg7 40.Rh7+ skewering the Rook on c7.

Jan-05-16
Premium Chessgames Member
  agb2002: White has a rook for a bishop.

The black queen prevents 37.Qf8#. Hence, 37.Nxh7:

A) 37... Qxh7 38.Qf8#.

B) 37... Qg7 38.Nf6+ Qxh6 39.Rxh6+ Kg7 (39... Rh7 40.Rxh7#) 40.Rh7+ followed by 41.Rxc7 + - [2R+P vs B].

C) 37... Kg8 38.Nf6+ Qxf6 39.Qxf6 wins.

D) 37... Bxg2+ 38.Kxg2 Rc2+ 39.Kg1 wins.

Jan-05-16
Premium Chessgames Member
  agb2002: <Penguincw> 29... Ne1+ 30.Kg1 Qh1+ 31.Kxh1 Rf1+ 32.Qg1 Bc6+ 33.Rg2 (33.Re4 Bxe4#) 33... Bxg2#.
Jan-05-16
Premium Chessgames Member
  al wazir: I thought, 37. Nxh7, is that all? After 37...Qg7 38. Qxg5 (38. Nxg5+ Qxh6 39. Rxh6+ Kg8 40. Nxe6) Qxg5 39. Nxg5+ Kg8 40. Nxe6, white has an exchange and three ♙s, which is certainly enough to win. 37...Qxh7 is a clear coroner's verdict of suicide.

But the equally straightforward 37. Qxg5 Rc2 (What else is there? If 37...Qf8, then 38. Qg6) 38. Rg1 is just as good.

Jan-05-16  Nick46: <diagonalley: hmmmm..... black has a spite check, but to no avail> And he didn't even bother to avail himself of it.
Jan-05-16
Premium Chessgames Member
  patzer2: Today's quick and easy Tuesday solution 37. Nxh7! wins almost too easy, as a strong GM resigns by allowing mate-in-one after 37...Qxh7 38. Qf8#.

Black no doubt threw in the towel, allowing the quick ending, due to unpleasant alternatives like 37... Qg7 38. Nf6+ Qxh6 39. Rxh6+ Kg7 40. Rh7+ Kf8 41. Rxc7 (mate-in eight, Deep Fritz 15).

A clever winning alternative for White, which I like, is 37. b5! when play might continue 37...Qg7 38. Qxh7+ Qxh7 39. Rxh7+ Rxh7 40. Nxh7 Kxh7 41. Ra1 Bxg2+ 42. Kxg2 Nc3 43. Ra7+ Kg6 44. Rb7 Nd5 45. Rd7 g4 46. Rd6 Kf7 47. Rxd5 exd5 48. Kg3 Ke6 49. Kf4 Kf7 50. Kxf5 (mate-in-eleven, Deep Fritz 15).

Hard to find an improvement for Black as he gets decisively out maneuvered in the subtle positional play of this Sicilian Kan.

In human play, Black appears to me to be practicallty busted after 22. Bh6 . Yet Komodo 9.02 @ 29 depth and Stockfish 5 SE @ 34 depth, indicate it's level after 22. Bh6 Nb2 23. Bxf8 =. These computer evaluations, indicating Black is level after initially losing the exchange here, are IMO unreliable.

As this game illustrates, the position after 22. Bh6 is one that's extremely difficult, if not impossible, for a human to defend.

Never have been much of a fan of the Sicilian Kan, and after seeing this game I'm even less of one. So I'll take my cue from the World Champion and avoid 2...e6 in favor of 2...d6 as in J Duda vs Carlsen, 2015 or 2...Nc6 as in Caruana vs Carlsen, 2015.

Jan-05-16
Premium Chessgames Member
  Once: That's an interesting little puzzle. The immediate Qf8+ and Qxh7+ don't work, but 37. Nxh7+ leaves Black trying to defend the back rank and h file at the same time.

One to file under the theme of "overworked queen", I think.

Jan-05-16  saturn2: After 37 Qxg5 37...Qf8 seems forced. Otherwise black looses the queen for the rook and knight. My idea then was 38 Qg6 and again 38...Qf7 seems forced since black has to protect h7 again. But afterall 39 Rxh7 wins the black queen for rook and knight and white gets also the pawn e6 afterwards.

<patzer2 avoid 2...e6> I use this opening frequently and have to admit that somtimes white gets a dangerous attack against my king, because there are not enough pieces around to protect it. But I still believe in Paulsen, Kan or whatever you call it - the mistakes havening to be found not in blacks second move but afterwards. For example in this game 17...Nc5 seems dubious. After whites b4 the black knight was isolated.

Jan-05-16  Chess Dad: I chose the second best move. Qxg5.

At depth of 30, Stockfish rates that as a +14 or so.

Nxh7 was a north of +100, so quite a difference.

No points.

Jan-05-16  morfishine: After <37.Nxh7> the threat of exposed check leaves Black defenseless. If 37...Qxh7, White has 38.Qf8# since the Black Queen is now conveniently pinned

*****

Jan-05-16
Premium Chessgames Member
  Oxspawn: I thought his looked like an ultra-easy Monday puzzle until I noticed the black rook on c7 and abandoned the idea of using the queen as a battering ram on h7. Then found this satisfying finish.

37. Nxh7 Qxh7
38. Qf8#
Counter attacking through 37Bxg2+ 38. Kxg2, 38. Rc2+ Kg1 does not help. One defence looked promising at first.
37. Nxh7 Qg8
38. Nf6 (discovered check) Rh7
39. Qxh7+ Qxh7
40. Rxh7#
So in the end the battering ram does work. I think.

Jan-05-16  Cheapo by the Dozen: I also went with Qxg5, after which White soon has queen and some pawns vs. 2 pieces.

That's probably a slower win, however, especially since before he completely mops up White probably has to take some time defanging Black's pressure on g2.

Jan-05-16  clement41: My first instinct led me to the forcing line Qxh7+ QxQ RxQ+ RxR NxR KxR Ra1 and if Knight moves,Ra7 with a endgame, but after Ra1 I then saw there's ...Bc6 and that d5 exd doesn't help white
Jan-05-16  Sularus: Nxh7 etc
Jan-05-16
Premium Chessgames Member
  patzer2: <Saturn2> Thanks for the response. I agree 2...e6 was not the cause of Black's defeat. I just don't prefer it, because IMO Black gets more active counter play with 2..d6 or 2...Nc6.

As to <17...Nc5> being the culprit I'm a bit skeptical as other Black moves still seem to leave White with a big advantage in space and development.

If I were forced to play this 2...e6 Sicilian opening line, I'd probably start by skipping 7...d6 and replacing it with one of the more popular moves 7...Bc5 as in V Kovalev vs Svidler, 2015 or 7...Nc6 as in J Nordenbaek vs S Shankland, 2015.

If I were felling lucky, in the "Dirty Harry" Clint Eastwood sense of the word (i.e. "Do you feel lucky punk?"), I might risk 16...0-0-0!? here.

Jan-05-16
Premium Chessgames Member
  kevin86: A harder version of yesterday's theme: white forces black to pin himself so that the pinning piece cannot attend to other duties.
Jan-05-16  CHESSTTCAMPS: White is up a rook for a bishop, is fully mobilized for attack, and has the black king cornered. The simplest coup de grace is

37.Nxh7 threatening 38.Nf6+ forcing mate:

A.37... Qxh7 38.Qf8#

B.37... Qg7 38.Nf6+ Qxh6 39.Rxh6+ Kg7 40.Rh7+ wins a rook.

C.37... Kg8 38.Nf6+ wins queen and mates shortly.

D.37... Bxg2+ 38.Kxg2 Rc2+ 39.Kg1 leaves black a rook down with no counter-play.

Jan-05-16  BOSTER: "He'll come back", thought the Black King about his Knight on a4.
Jan-05-16  PJs Studio: I'm so accustomed to the Qxh7...Rxh7 mate that I had to keep looking for another minute to finally see Nxh7 (which appears a little brutish at first if one doesn't see Qf8#)
Jan-05-16  mel gibson: It takes 11 moves to mate black.
if Black plays 37.... Qg7
instead of 37...QxN
Jan-05-16  stst: Blk got R & Q guarding h7, so either W's Q or R taking by brute h7 won't work. Left is a N-take, but, it won't be quick, nor of beauty (will check back at home... no graphics for now!!)

For a Tuesday, CG better finds a nicer-looking POD (But, of course, it has its right to select any...) Is that the trend for the New Year!?

Happy New Year to ALL anyhow!!

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