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Filiz Osmanodja vs Hanna-Marie Klek
German Masters Frauen (2014), Dresden GER, rd 7, Nov-23
Nimzowitsch Defense: Williams Variation (B00)  ·  0-1

ANALYSIS [x]

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sac: 53...Qg3+ PGN: download | view | print Help: general | java-troubleshooting

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Dec-29-15
Premium Chessgames Member
  Penguincw: Last Tuesday puzzle of the year. Tuesday puzzles are generally easy, so I have to get it, at all costs.

When I first looked at it, I saw white threatening mate on g7 and h5, and knew it had to be stopped. But wasn't sure how.

About 5 minutes later, I returned, and realized black had 2 types of options. One is to prevent the mate, but the only option is 53...Qg6, which doesn't look too great, so that's probably not the answer.

The other option is to give check. There are 4 moves black can play to give check. There's 53...Nf5+, but 54.Nxf5, and it looks even worse than before.

Then there's 53...Rxg4+, but white can followup with 54.hxg4. 53...Qxh3+ is also an option, but not good either after 54.Kxh3 Rc3+ 54.Kh4. Then I saw the winning move, 54...Qg3+ 55.Kxg3 Ne4+ followed by 56...Nxg5 57.Nxg5 Rxb4, and black is up the full exchange.

However, I'll be honest. This position probably looks easier to win than it actually is. I mean, it still should be an easy win, but there's a lot of white pieces on the kingside, but the king, pawn and rook should be enough to stop the odd man rush. In any case, black should be able to get a queen before white can really do any damage.

FTR, the Endgame Explorer states that this is a win for the rook 86.7% and a draw 9.7%.

Endgame Explorer: RPPP vs NPPP

Now you might've gotten this puzzle as well, but the question I ask, would you have gotten it OTB? Obviously, it's easier to get if someone <tells> you there's a tactical shot, but would you have gotten it if you played black in this game and white just played 53.Qg5?

You better hope you would've. In this position, black has 36 legal moves (not including off the board moves like resigning, draw offer, etc.), 35 lose, and 1 wins. Difference between a win and loss.

Dec-29-15  stst: Black's g8 is immediate mating target by W Q., and there's no help. Have to keep checking and try to get rid of W Q.

53............Qg3+ (only spot to let N fork if KxQ)
54.KxQ (no reason to flee to h5 when QxP+, W Q intervene, and QxQ, KxQ and W reaps no benefit at all.) Ne4+ 55.Kh4 NxQ
56.KxN Rxb4 and Black got R+3P vs W's N+3P, though the f6 P needs to be removed quick.

Did not find any better move to remove Qg8+ threat.

Dec-29-15  patzer2: Took a few minutes to find 53...Qg3+ in order to force a simplifying Knight Fork for today's Tuesday puzzle solution.

White's decisive error appears to be 42...Ned5?, allowing 42...Qxc2 (-2.02 @ 25 depth, Deep Fritz 14). Instead, 42...Ncd5 = (0.00 @ 25 depth, Deep Fritz 14) keeps it about level.

Earlier, instead of 31. Qg3 =, 31. Qf3 seems to offer White winning endgame chances as play might continue 31...Rb8 32. Nxh6+ gxh6 33. b3 Qe6 34. Nd5 dxe5 35. fxe5 Bg7 36. Nxc7 Qe7 37. Nxe8 Qxe8 38. b4 a5 39. Rd5 axb4 40. axb4 Nd8 41. c3 Ne6 42. Qd3 Rc8 43. Qxb5 Qxb5 44. Rxb5 Rxc3 45. Rb8+ Kh7 46. Rb7 Bxe5 47. Rbxf7+ Ng7 48. Rb1 Kg6 49. Rf3 Rc7 50. b5 Rb7 51. g4 Ne6 52. Rf5 Bf6 53. Kg2 (+0.67 @ 23 depth, Deep Fritz 14).

Dec-29-15  MindCtrol9: It took me 2 mins to see the move.White was mating in one move.With 53...Qg3 Black saves the game.
Dec-29-15  roentgenium: Managed it, though I too considered the stalemate idea at first. In response to <Penguincw>, I think there is some chance that I might have seen this OTB if given enough time, simply out of desperation! Definitely not a guarantee though.

It looks like the combination starts at Black's 50th move - which means that Black allows herself to be one move away from being mated, which makes the overall feat more impressive in my eyes.

I also tried to see if there was anything for White on move 50, but it looks like Rh8+ and Nxg6 fail.

Dec-29-15  cocker: Process of elimination today.
Dec-29-15
Premium Chessgames Member
  Oxspawn: With white about to mate on g7, black has to have something immediate and decisive. Nf5+ looks dramatic enough but is hopeless. Neither Rxg4+ or Qxh3+, has any follow up. A pity since it I had an idea that the answer lay in driving the white king northwards towards the unapproachable king and pawn. The puzzle says ‘easy’, so clear the brain from its surfeit of fatty calories and focus.

And lo, in the east arises a move that seems absurd enough to work. 53……… Qg3+

Now if
54. Kxg3 Ne4+ forks the queen and king. That leaves white with a knight and four pawns (one hanging) against a Rook and three pawns, two of them about to become passed.

If 54. Kh5 Qxh3+
55. Qh4 Qxh4
56. Kxh4 and black is a rook up with the white pawn on b4 about to fall and the black queenside pawns free to run for promotion.

Dec-29-15  Abdel Irada: A strange situation: a rook ahead, but threatened with two different mates-in-one and with no productive checks in sight. This made me briefly wonder if it was a stalemate I should be looking for, but that didn't take more than a glance at a6 to rule out.

But ... what if we could *fork* king and queen? This would be easy, if only White's king were on g3.

As with the belling of the cat, the question became, "Who will lure the king to g3?" A suicide mission, and only one agent to carry it out: Her Royal Highness Herself, and a veteran of such missions, <Monday's Queen> -- this time making a rare encore appearance on a Tuesday.

Monday's Queen, always resurrected only to sacrifice herself for victory again in the next battle, yields herself to the angels with

<53. ...Qg3+>, practically forcing

<54. Kxg3 ... >.

(If 54. Kh5?, Qxh3+ forces the queens off, leaving Black a clear rook ahead.)

Now, so self-sacrificing is Monday's Queen that she is perfectly willing to take her fellow agents along for the self-immolation, and so the knight enters the scene only to leave it:

<54. ...Ne4+
55. Kh4, Nxg5
56. Kxg5, Rxb4>
,

and when the shooting stops we find Black the exchange ahead with a clear win in prospect.

---

Addendum: Congratulations to <cg.com> on making the last Tuesday of the year one with a puzzle sufficiently intriguing to provoke thought among some of this site's best commentators, whose analyses appear above. Simple enough in concept for a Mon ... er, Tuesday, but just a shade deceptive in exactly the sort of way that's more likely to beguile an experienced solver (who distracts himself by looking for things like stalemates) than a novice (who will simply solve it by attrition).

Dec-29-15  5hrsolver: Not at all easy for me. I stared and stared. Black is about to checkmated. Nothing seemed to work. I thought I was getting punked.
Dec-29-15
Premium Chessgames Member
  alexmagnus: Oh, a puzzle of the day by the least known of my favourite players! Well done Hanna :-)

Took me some time to find the queen "sac", but solved. Tuesday is usually solved by me, difficulties begin at Thursdays.

Dec-29-15  morfishine: <53...Qg3+> sets up a winning fork and exchange up endgame

*****

Dec-29-15  Abdel Irada: <Now you might've gotten this puzzle as well, but the question I ask, would you have gotten it OTB? Obviously, it's easier to get if someone <tells> you there's a tactical shot, but would you have gotten it if you played black in this game and white just played 53.Qg5?>

But that's just the thing: She didn't *just* play 53. Qg5; she played 53. Q<x>g5, a forced capture amid a forcing combination obviously already calculated by Klek.

So, simply to have reached the position, one would expect to have calculated the line to its conclusion. And by some chance one hadn't: "When a man knows he is to be hanged in a fortnight, it concentrates his mind wonderfully," and so do multiple mate threats.

I think, therefore, that almost anyone who solved this puzzle as a puzzle could also have found the continuation OTB.

Dec-29-15
Premium Chessgames Member
  agb2002: Black has a rook for a pawn.

White threatens 54.Qh5#, 54.Qg7#, 54.Qg8+ Kh6 55.Qh8#.

53... Ne4 would threaten 54... Nxg5. Hence, 53... Qg3+, enabling a knight fork with tempo:

A) 54.Kxg3 Ne4+ 55.Kf4 Nxg5 56.Kxg5 Rxb4 - + [R vs N]. For example, 57.h4 Rc4 58.h5 b4 59.Kf5 b3 60.g5 Rc5+ 61.Kg4 Rxg5+ 62.Kxg5 b2 wins.

B) 54.Kh5 Qxh3+ 55.Qh4 Qxh4+ 56.Kxh4 Rxb4, etc.

Dec-29-15  Kasparov Fan: "when in a mating net look for sacs"
In OTB play I've encountered it couple of times as in the puzzle.
Dec-29-15  CHESSTTCAMPS: White is down a rook for a pawn, but has two distinct checkmate threats: Qg7 and Qh5. There is only one forcing continuation that can prevent a loss:

53... Qg3+! 54.Kxg3 Ne4+ 55.Kf4/h4 Nxg5 56.Kxg5 and now black has a won endgame after 56... Rxg4 with the unimpeded connected passed pawns.

Dec-29-15
Premium Chessgames Member
  thegoodanarchist: I couldn't see what the Klek was going on.
Dec-29-15  saturn2: my "solution" was 53....Qg6 followed by 54 NxQ fxN and now the threat is 55 ...Nf5+ BUT the king can simply escape 55 Kg3
Dec-29-15
Premium Chessgames Member
  kevin86: I missed the saving clause of Qg3+!! Black will remain an exchange ahead and the cloud of mate will pass over.
Dec-29-15
Premium Chessgames Member
  Jimfromprovidence: FWIW, 56...a5 seeing 57 bxa5 b4 is a straightforward alternative to the text.


click for larger view

Dec-29-15  dfcx: White is going to checkmate next move. So I am looking for either a quick mate by black or a way to prevent mate.

I do not see any way to mate quickly for black, so have to settle for prevention with check. All three pieces can check but either the rook or knight check just loses the piece. That left the queen to do the job.

53...Qg3+ 54.Kxg3 (Kh5 Qxh3+ 55. Qh4 Qxh4+ is even better for black) Ne4+ 55.Kh4 Nxg5 56.Kxg5 Rxb4 wins

Dec-29-15  JohnBoy: My thought process was almost exactly as that described by <Phony>. I probably looked for ways to generate a royal fork twice before the aha moment - roughly 30sec in to my uncoordinated mental scrambling.
Dec-29-15  stst: Saw Qg3+ right the way, didn't see any stalemate as some mentioned. Strange, at least both the Blk N and R are free to move!!
Dec-29-15
Premium Chessgames Member
  transpose: I do not often solve these quickly, but this one I did, at least through Rxb4. My approach was to realize that black was going to get mated and that a royal fork was also in the air but not immediately apparent. Rather quickly I saw that Q-g3+ staves off mate and after the fork allows blacks Q-side pawns to roll.
Dec-29-15
Premium Chessgames Member
  perfidious: More difficult than the usual Tuesday fare.
Dec-29-15  mel gibson: Saw it in a few seconds - forced queen swap & then an easy win.
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