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Aleksandr Lenderman vs Kamil Dragun
London Chess Classic Open (2014), London ENG, rd 6, Dec-13
Queen's Gambit Declined: Ragozin Defense (D38)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
May-27-17  Moszkowski012273: Always root for Lenderman cause he's my neighbor.

But 37...Rd4 was NICE!

May-27-17  Walter Glattke: 38.g3 Rdd1 39.Qxd1 Rxd1 40.Kg2 Rd3 41.Nh2 f3+ 42.Kg1 Qh3 43.Rh7+ Kxh7 44.Nxf3 Rd1+ 45.Ne1 rxe1# 38.Nxd4 Qxh4#
May-27-17
Premium Chessgames Member
  al wazir: Can 38. Ra7 be right? What's wrong with 38...Rxa7 ?
May-27-17  stingray0104: I was also thinking 38...Rxa7. Checked with a computer which suggests it is still completely winning but it allows 39 Qxb5, threatening Qe8 and perpetual, so black must retreat to defend.

Looks like 38...Rb1 does a better job maintaining the initiative, and black wins the material anyways.

May-27-17  Mendrys: 38...Rxa7 is likely winning as well but I think he wanted to force the trade of queen for rook as white is forced to do after black gets Rd8 in.

Once Lenderman saw that he was busted he was hoping to gain a tempo to make the mating threat with the Knight and Rood at the end something to deal with.

May-27-17  Cheapo by the Dozen: Remarkably easy for a Saturday -- at least if I'm correct that 38 Rxa7 would also have won.

I actually looked at ... Rd4 for defense against the passed pawn before I did for offense. But once I realized that it was poisoned, and why, there was only a small step to seeing its offensive value as well.

May-27-17
Premium Chessgames Member
  agb2002: Black has a rook for a knight and a pawn.

Qxh4# prevents Nxe5.

This detail suggests 37... Rd4 to double rooks on the first rank:

A) 38.g3 (to protect h4) 38... Rdd1

A.1) 39.Ng5(xe5) Rh1+ 40.Kg1 Rag1#.

A.2) 39.Kg2 Rh1 40.Ng5 (due to Qh3#) 40... Rag1#.

A.3) 39.Qxd1 Rxd1 40.Ng5 fxg3+

A.3.a) 41.fxg3 Qe2+ 42.Kh3 Rh1#.

A.3.b) 41.Kg2 gxf2+ 42.Kxf2 (42.Kh2 Rh1+ 43.Kxh1 Qg1#) 42... Rd2 43.Ke3 (43.Ke(f)1 Qd1#) 43... Qe2#.

B) 38.Qxb5 Rdd1 39.g3 Rh1+ 40.Kg2 Qh3#.

C) 38.Ng1(5) Qxh4+ 39.Nh3 Rdd1 40.g3 (40.g4 Rh1+ 41.Qxh3#) 40... Rh1+ 41.Kg2 Qxh3+ 42.Kf3 Qg4+ 43.Kg2 Rag1#.

D) 38.Rc3 (to cover on h3) 38... Rdd1 as in B.

E) 38.Rh7+ Kxh7 39.Ng5+ just loses material because the queen is protected.

May-27-17  Walter Glattke: 38.Ra7 Rxa7 39.Qxb5 Rd1 40.Qe8 Qd7 41.Qxe5 Qg7 (41.Qh8+ Qh7 42.Qf8+ Rg7 43.Nxe5 Qg8 44.Qxf4+ Kh7) 42.Qxf4+ Kh7
43.Ng5+ Kh8
there is one thing wrong with 38.-Rxa7:
the mating lasts longer!
May-27-17  mel gibson: I couldn't see that.
The computer agrees with the first 2 moves:

37. Kh2 Rd4 (37. ..
Rd4 (♖b4-d4 ♖c7-a7 ♖a1-c1 ♖a7-c7 ♖c1xc7 ♕e2xb5 ♖d4xe4 ♕b5-a6 ♕g4-d7 d5-d6 ♖c7-b7 ♕a6-d3 ♕d7-f5 ♕d3-c2) +6.78/18 180)

score for black +6.78 depth 18

May-27-17
Premium Chessgames Member
  morfishine: Dragun variation

*****

May-27-17
Premium Chessgames Member
  whiteshark: The Lenderman almost got him
Game Collection: 85#__How to get away with Checkmate otb
May-27-17  RandomVisitor: 35.Rxc7 was the problem, instead if <35.Qd3>:


click for larger view

Komodo-10.1-64bit: <4 hours computer time>

<+3.45/44 35...Ra8 36.b3 Qd7 37.Rc3> Kg7 38.Qc2 Kg8 39.Ng5 Ra7 40.Ne6 Qe7 41.Rc6 Kh7 42.Qc3 Kh6 43.Ng5 Rd4 44.g3 Qf6 45.Qc2 Rb4 46.Qd3 Rd4 47.Qe2 Rb4 48.Qb2 Rd4 49.Kg2 Rb4 50.Qc3 Ra2 51.Qf3 Ra7 52.Ne6 Ra3 53.R1c3 Ra7 54.Nxc7 Rxc7 55.Rxc7 Bxc7 56.Rxc7 Qd8 57.Rc6 Rd4 58.Re6 Qc7 59.g4 Qd8 60.g5+ Kg7 61.Rxe5 b4 62.Re6 Qf8 63.Rf6 Qe7

May-27-17
Premium Chessgames Member
  patzer2: If only someone would only flash a notice telling me I had a winning puzzle move, I would significantly improve my game.

For today's semi-insane Saturday puzzle (37...?), I asked myself what is the craziest looking move, offering up material, which I could make.

That's when I found 37...Rd5! offering a poisoned Rook in exhange for the King after 37...Rd5 38. NxR?? Qxh4#.

As the game continuation indicates the Black Rooks will line up on the first rank and force the win of decisive material.

May-27-17
Premium Chessgames Member
  Jimfromprovidence: Didn't get it. I kept looking at more defensive moves. Thought black might even be losing, hoping for a draw at best.

For example, at the puzzle position below, the black queen has no safe squares to move to while white threatens 38 Qc2, seeing 39 Qc5 with mate next move.


click for larger view

The only thing I saw was 37..Rb3, threatening 38...Rxf3, but white has 38 Rc3, below, in response.


click for larger view

May-27-17
Premium Chessgames Member
  morfishine: There really was no way to defend this, nice game by Black

*****

May-27-17  Marmot PFL: 37...Rd4 38 Nd4 Qxh4 mate, otherwise Rd1 Rh1 mate is threatened which wins material.
May-27-17
Premium Chessgames Member
  patzer2: White's game takes a deliberate bad turn with the weak and losing exchange sacrifice 35. Rxc7? Bxc7 (-6.07 @ 28 depth, Stockfish 8.)

Instead, White can maintain a strong advantage with 35. Qd3 to (+1.70 @ 30 depth, Stockfish 8.)

May-27-17  ChessHigherCat: If 14. Ne4? Qg6 15. Bd3? Nb4!
May-27-17  ChessHigherCat: 37...Rd4 looks like the worst move on the board except it wins in every variation! Brilliant.
May-27-17  devere: <patzer2: White's game takes a deliberate bad turn with the weak and losing exchange sacrifice 35. Rxc7? Bxc7 (-6.07 @ 28 depth, Stockfish 8.)>

It's easy in retrospect to criticize 35.Rxc7?!, but in fact every Black move except 37...Rd4!! loses. White simply missed Black's brilliant resource.

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