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Jorge Cori vs Niclas Huschenbeth
World Junior Championship (2012), Athens GRE, rd 13, Aug-15
Queen's Gambit Accepted: Classical Defense. Rubinstein Variation (D27)  ·  0-1



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Given 3 times; par: 114 [what's this?]

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Kibitzer's Corner
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Premium Chessgames Member
  whiteshark: Huschi analysed his last round game here:
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  Robed.Bishop: I particularly enjoyed black's endgame tactics.
Premium Chessgames Member
  piltdown man: A complicated way to win a pawn.
May-11-13  spikester2848: What happens after 18.BxN ?
Premium Chessgames Member
  Phony Benoni: <spikester2848>: After <18.BxN> [18.Bxc2]:

click for larger view

Note that Black's last move, 17...NB7 [17...Nc2] uncovered an attack on White's rook. Black now wins the exchange with <18...BxR> [18...Bxa3], since White loses even more material after <19.PxR NxN> [19.bxa3 Nxc3] forking White's queen and rook.

17...NB7 is a really interesting move. Note that after 18.QxN BxR 19.PxB [18.Qxc2 Bxa3 19.bxa3], Black can still capture the knight. And NxN [Nxd5} never works because Black has ...QxN [Qxd5] threatening mate.

May-11-13  dick50: I tried 18 ... N(d5)b4 19 Bxc2 Nxa2 20 Nxa2 Qd5, recovering piece on a2 because of the with mate threat . But could not find an effective continuation after 21 Qf3
May-11-13  diagonalley: i didn't spot this one... (was looking for something that delivered a game-ending advantage)...nice combo though
Premium Chessgames Member
  agb2002: The material is identical.

White threatens 19.B(Q)xc2.

My initial idea was to try to leave the rook on a2 undefended so that ... Qd5 would create the double threat ... Qxg2# and ... Qxa2. However, to exploit the weakened white back rank seems more feasible. This leads to 18... Nxd4, removing two obstacles (pawn & knight) and diverting a defender:

A) 19.Rxd4 Nxc3 (menacing ... Nxe2+ and ... Qxd4)

A.1) 20.Rxd8 Nxe2+ 21.Kf1 Rxc1+ 22.Kxe2 (22.Rd1 Rxd1+ 23.Kxe2 Rxb1 - + [R+2B+P vs N]) 22... Rxd8 - + [R+B+P vs N].

A.2) 20.bxc3 Qxd4 (eliminating another defender and another obstacle) 21.cxd4 (21.Rc2 Rxc3 - + [R+B+2P vs N]) 21... Rxc1+ 22.Qf1 Rxf1+ (22... Rfc8 23.Nd3) 23.Kxf1 Rc8 24.Nd3 (24.Ke2 Bxg2 - + [B+2P vs N]) 24... Rc4 seems to win a second pawn with a won ending.

A.3) 20.Qe3 Rxd4 21.Qxd4 Ne2+ 22.Kf1 Nxd4 wins a rook and a pawn.

B) 19.Qe1 Nb4 with an extra pawn and many threats Nxa2, Qd5, Rf6-g6, etc.

May-11-13  Abdel Irada: <<> "Rank" pawn-snatching <>>

In which Black embarks on a combination which, with best play, wins a single pawn, and all is predicated on the masked weakness of the enemy back rank.

Following is the main line. There are deviations, but they seem to be relatively unimportant.

<<> 18. ...Nxd4! >

Black can maintain equality or perhaps a slight positional edge with 18. ...Ncb4 and other such quiet moves, but we're angling for an advantage.

<<> 19. Rxd4, Nxc3 >

White's rook is undefended and his queen is attacked with check. Taking on d8 doesn't work: (a) 20. Rxd8, Nxe2 21. Kf1, Rfxd8, and White has lost a rook; if he tries 22. Kxe2, Rxc1 is convincing.

<<> 20. bxc3, Qxd4 >

This move "works" because of White's undefended back rank.

<<> 21. cxd4 ... >

There's nothing better. After (b) 21. Bd2, Qd5, Black is the exchange and a pawn ahead.

<<> 21. ...Rxc1

22. Qf1, Rfc8 >

Black regains queen for rook and enters the endgame only a pawn to the good. However, his two bishops are quite strong, so the second player's advantage is clear if not winning.

Premium Chessgames Member
  pittpanther: <<dick50 I tried 18 ... N(d5)b4 19 Bxc2 Nxa2 20 Nxa2 Qd5, recovering piece on a2 because of the with mate threat . But could not find an effective continuation after 21 Qf3>> What about playing 21... Rxc2? This leaves black up the exchange.
May-11-13  diagonalley: <chrisowen> are you by any chance related to the late (great) professor stanley unwin(?)
Premium Chessgames Member
  agb2002: <pittpanther: <<dick50 I tried 18 ... N(d5)b4 19 Bxc2 Nxa2 20 Nxa2 Qd5, recovering piece on a2 because of the with mate threat . But could not find an effective continuation after 21 Qf3>> What about playing 21... Rxc2? This leaves black up the exchange.>

After 18... Ndb5 19.Bxc2 Nxa2 20.Bb3 Nxc1 21.Bxe6+ Kh8 22.Rxc1 White is an exchange down for pawn but there is the double threat Bxc8 and Nf7+.

May-11-13  cyclon: Now, this one was very fine and also 'very difficult' puzzle at least in my view. My prefatory move today is 18. -Nxd4 ( my line(s) maybe on the wrong track altogether, but this is the best I found today since f.e. 18. -Na3 19. Ra1 , or 18. -Ndb4 19. d5!? White gets things messed up. Straight mistake is 18. -Rxc3 19. bxc3 Nxc3 20. Qxc2 and Black just loses a piece ).

After 18. -Nxd4 I propose four 'main'-line:
1.) 19. Qe1(!) ( in my view relatively the best - 19. Rxd4? is an outright mistake; 19. -Nxc3 and either 20. Rxd8 Nxe2+, or 20. bxc3 Qxd4 both loses material for White ) 19. -Nxc3 20. bxc3 Qd5 ( threatens mate on g2X) and now either 21. f3 ( in my view better than 21. f4, because it takes e4-square from the Black Bishop ) 21. -Qb3 and NOW best for White seems to be 22. Bd2 ( 22. Bb2 Nc2 ) 22. -Nc6 and Black's got pawn and the bind, whereas f.e. 22. Rb2 Qxc3 23. Qxc3 ( 23. Rxb6? Nxf3+ followed by 24. Bc5+ wins material for Black ) 23. -Rxc3 and NOW 24. Ba2 Ba3 / 24. Rbd2 Nb3 / 24. Bd2 Rb3 / 24. Be3? Rxe3 25. Rxb6 [ 25. Rxd4 Bc5 ] 25. -Rxe5 wins / 24. Nd7? Rd8 / 24. Bf4 Rd8 and besides material edge, there's just too many threats against White. These are just some illustrations. In this line another sub-line is after 18. -Nxd4 19. Qe1 ( if 19. Qf1 straight, Black just captures on c3 winning another pawn ) 19. -Nxc3 20. bxc3 Qd5 21. Qf1 and NOW 21. -Rxc3 ( 21. -Qxe5 33. cxd4 gives White some more counterchances ) Black has won another pawn because f.e. 22. Be3 ( on 22. Bd2/ Bb2 comes 22. -Ne2+ 23. Kh1 Qxe5 should be decisive edge ) 22. -Bc5 23. Rad2 Qxe5 24. Bxd4 Bxd4 25. Rxd4 Bd5 with decisive advantage for Black. Then:

2.) ( 18. -Nxd4 ) 19. Qd3 and NOW 19. -Nb3 and Black's got the edge ( 19. -Nxc3 20. bxc3 Be4?!, or 19. -Bc5?! ) . In my view 19. -Nb3 is the simplest way to keep the pawn and good game.

3.) ( 18. -Nxd4 ) 19. Qd2 Nb3 20. Qc2 ( 20. Qe1 Bb4 and it looks like Black's bind produces some fruits in the near future ) 20. -Nxc1 21. Qxc1 ( 21. Rxc1 Nb4 wins the exchange ) 21. -Nxc3 22. bxc3 ( 22. Rxd8? Ne2+ ) 22. -Rxc3 wins another pawn.

4.) ( 18. -Nxd4 ) 19. Qh5? Rxc3 winning material.

To me it seems that underlying theme here was just to get a narrow edge for Black. Very rich and complex position and maybe there is some flashing continuation in the game.

May-11-13  cyclon: I got the game-line in my analysis, but didn't consider it the most serious defence for White. Black is pawn up with the Bishop-pair in the open end-game situation. It's not difficult to estimate whom the 'fate' favors taking into consideration, that in these puzzles are usually skilful players involved.
May-11-13  M.Hassan: "Very Difficult"
Black to play 18...?
Equal forces.

19.Ra3 Nf7
20.Nxf7 Kxf7!
21.Rb3 Qc7
22.Re1 Qc4
Supporting e6 while attacking the unprotected Rook.
23.Qxc4 Rxc4
24.Be3 Rd8

I don't know if I can claim to have solved todays puzzle or not because after 7 moves the sides are still equal and I can't see any obvious advantage on the sides of Black. Best to see how game continued.

Miles different

May-11-13  Patriot: An interesting line is 18...Nxd4:

19.Rxd4 Rxc3

20.bxc3 Nxc3 21.Qd2 Qxd4 22.Qxd4 Ne2+

20.bxc3 Nxc3 21.Rxd8 Nxe2+ 22.Kf1 Rfxd8 23.Kxe2 Rxc1

20.Rxd5 Qxd5 21.Be4 Rxc1+

20.Qd2 -- Interesting but 20...Rc8 is ok I think.

I'm sure there's a lot more to this.

May-11-13  Patriot: Oh well--After 22...Ne2+ I missed the fact the rook is guarding that square.
Oct-16-19  Walter Glattke: Puzzle yes, but "petite combinaison" in Capablanca sense, no!
Oct-16-19  Walter Glattke: 18.Bxc2 ++-
Oct-16-19  Granny O Doul: Note that 63...h1Q fails to win after 64.Rg8+.
Oct-16-19  patzer2: Had to flip the board and view it from the Black side to solve today's Wednesday (19...?) puzzle.

White is a piece up, and the only move to give Black any advantage is 19...Nxc3! ∓ to-+ (-1.39 @ 31 ply, Stockfish 10). All others lose, including 19...Rxc3? 20. bxc3 Nxc3 21. Qe3 +- (+5.27 @ 26 ply, Stockfish 10) which I spent too long calculating.

After giving up on 19...Rxc3?, I looked at 19...Nxc3 ∓ and calculated 19...Nxc3! 20. bxc3 Qxd4 ∓ as Black's game saving line.

P.S.: White's game goes bad with 17. Nc3? allowing 17...Nc2! ∓ to -+ (-1.73 @ 28 ply, Stockfish 10).

Instead, 17. Rf3 a5 18. Nc3 Nxc3 19. bxc3 ⩱ (-0.35 @ 30 ply, Stockfish 10) keeps the position just about level.

Oct-16-19  Walter Glattke: 18.Bxc2 Ba3 19.Nxd5 2N for 1R
Oct-16-19  saturn2: White has material plus: knight for pawn.
Black wins back a piece and will be still up the pawn by

19...Nxc320.bxc3(Rxd8 Nxe2+) Qxd421.cxd4Rxc1+22.Qf1Rxf1+23.Kxf1Rc8

Oct-16-19  saturn2: <Walter Glattke> 18.Bxc2Bxa319.Nxd5<Qxd5> threatens mate on g2 and the bishop on a3 escapes yielding black advantage
Oct-16-19  zb2cr: The move is 19. ... Nxc3. It's based on the fact that White's back rank is vulnerable, and White's Queen is <en prise>, so 20. Rxd8, Nxe2+; 21. Kf1, Rxc1+; 22. Kxe2, Rxd8 is not feasible.

The best White can do is 20. bxc3, Qxd4!; 21. cxd4, Rxc1+; 22. Qf1, Rxf1+ and Black has gotten back the lost Knight and is a Pawn ahead.

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