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Aleksey Dreev vs Roberto Cifuentes Parada
Hoogovens Knockout (1995), Wijk aan Zee NED, rd 1, Jan-13
Semi-Slav Defense: Stoltz Variation (D45)  ·  1-0

ANALYSIS [x]

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sac: 19.Rxd6 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Sep-19-09  MaxxLange: <benjinathan> do you mean, in this position, would an exchange sac for the bishop been good, even if White somehow couldn't get a second piece for his Rook? Or, in general, are you asking, is that kind of sacrifice positionally justified?

In the second case, of course "it depends" on the exact position, but the exchange sac is very often used as a middlegame method to try to make one's minor pieces better.

Sep-20-09  benjinathan: <do you mean, in this position, would an exchange sac for the bishop been good, even if White somehow couldn't get a second piece for his Rook?>

Right-it is this. Sorry I was not clear.

To be more clear-do the positional qualities which have been discussed in the interesting posts above (esp. the dark squared weakness) justify the exchange sac where the piece being exchanged is the dsb...in this position?

Sep-20-09  benjinathan: I am thinking not. I think the positional advantages lose out to tactics, piece exchanges and, if not lost, that knight will be strong on d5.

Maybe, this is simply the full answer:<In the second case, of course "it depends" on the exact position,>

Thks Maxx

Sep-20-09  MaxxLange: it's kind of attractive to just kill that dark squared bishop where it stands. The DSB looks pretty strong. I'm sure it would at least feel good to chop it off with the White Rook! But that kind of general principle based analysis will keep you down at my rating :)

To make up a position close to this puzzle, but where White doesn't get the b4 Knight after Rxd6, you would have to change something: either the Knight would need to be on a different square, or something else would have to be on a different square, defending the Knight, or White would have to have some vulnerability that made it tactically impossible to take the second piece.

Analyzing such positions would be a really interesting and difficult training project

Sep-20-09
Premium Chessgames Member
  johnlspouge: < <benjinathan> wrote: [snip] Is 19.Rxd6 justified on its own (positional merits) or is it only the fact that white picks up the knight too, that makes Rxd6 appropriate? >

Hi, <benjinathan>. Computer evaluation is useful as an approximate but reproducible measure of a position. <patzer2> initiates a thread concluding that the B+N for R+P advantage resulting from the combination is worth +2 P but not +3 P. The answer to your question is therefore: yes, White requires the win of Nb4 (or its equivalent) to justify the combination.

Jan-21-15  Everett: Moves 14-20 are beautiful! Even after 16.Qc2, Black must be thinking "uh oh."
Nov-11-16
Premium Chessgames Member
  An Englishman: Good Evening: Too tough for me, but I have a question about the opening. After 8.0-0, why didn't Black try a Meran type of operation with 8...dxc4; 9.Bxc4,b5; 10.Bd3,a6? Or perhaps 9...c5? I assume that some specific detail of the position (the Qc2? The possibility of Nc3-e4?) makes these ideas unworkable, but can't see the specific tactics.

As it is, preventing Black's freeing ...c6-c5 becomes so important that White sacrifices a pawn to prevent it. Also, was 16...Na6 the best move? I would have played ...Nd7 to redeploy the Knight to f8 or f6 if needed.

Nov-11-16  YouRang: Friday 19.?


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Naturally, I was drawn to the capture <19.Rxd6>, which removes the defender of Nb4. Of course after <19...Qxd6>


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...the N is once again guarded by the queen -- but queens are more easily deflected.

The queen must remain on the b4-f8 diagonal to maintain its defense of the Nb4, which suggests that I want to deflect the queen with a bishop, i.e. Bc5.

Sadly, the immediate 20.Bc5 doesn't work, but white has the very resourceful in between move: <20.Ne4!>, buying time by attacking the queen while also guarding c5, which will make 21.Bc5 work just fine (e.g. <20...Qe7 21.Bc5 Qh4 22.Qh4 Qxb4>).


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White ends up with two pieces for a rook and somewhat better placed pieces.

~~~~

Checking with the computer, I see that the engine assesses the position (after 22...Qxb4) much better than I expected (over +4.00). Perhaps there are further tactics ahead.

Nov-11-16
Premium Chessgames Member
  patzer2: Must have remembered this one from seven years ago, as I had no trouble finding 19. Rxd6 Qxd6 20. Ne4 for today's Friday puzzle solution.

In the follow-up, the computers indicates White can improve over 22. f4 (+2.64 @ 22 depth, Deep Fritz 15) with 22. Bf3 (-4.15 @ 22 depth, Deep Fritz 15) or 22. Nc5 (+3.53 @ 22 depth, Deep Fritz 15).

For an improvement for the second player, instead of 15...Nxc5? allowing 16. Qc2 to (+1.45 @ 21 depth, Deep Fritz 15), Black can put up more resistance with 15...Bf8 (+0.58 @ 25 depth, Komodo 10.1) as in the drawn game V Zvjaginsev vs Kramnik, 1994.

Earlier in the opening, I slightly prefer the more popular move 8...dxc5 as in the drawn game Nakamura vs A Giri, 2016.

Nov-11-16
Premium Chessgames Member
  agb2002: White is one pawn down.

Black threatens Bxh2+.

Black's dsb protects the knight and it's about to win another pawn. This suggests 19.Rxd6:

A) 19... Qxd6 20.Ne4 (20.Rd1 Nd5)

A.1) 20... Qe7 21.Bc5 wins the knight with a much better position because of the weak dark squares and the inferior number and lack of mobility of the black pieces. For example, 21... Qh4 22.Qxb4 Reb8 23.Be7 Qh6 (23... a5 24.Qxb7) 24.Nf6+ Kg7 25.Qd4 c5 26.Qe5 looks winning.

A.2) 20... Qe5 21.Qxb4 with a similar conclusion as A.1.

B) 19... Nd5 20.Qh4 with attack. For example, 20... f6 21.Ne4 Qe7 22.Rxd5 cxd5 23.Nxf6+ Kh8 24.Bd4 e5 25.Bxe5 + - [B+N+P vs R] (25... Qxe5 26.Qxh7#).

Nov-11-16  AlicesKnight: I found the main line to give the "winning advantage" of two minor pieces for R but there is work to do. After 24.Nc5 the extraordinary position of White's N vs. Black's "bad" B also limits the Black QR and leaves White free to take an initiative. Black's R moves from 26 to 31 are an admission of paralysis. And then a K-side mating-net is born ....
Nov-11-16
Premium Chessgames Member
  al wazir: I got the first couple of moves, but I had no idea that white would be able to win by trapping the black ♔ in the corner (e.g., 33...Re8 34. Bf6+ K moves 35. Rh1, with Rh8# to follow.

I think black could have held out longer by playing 32...fxg6, giving his pieces some maneuvering space, e.g., 33. Bxe6 Re8 34. Bxc8 Raxc8 35. e6 Rc7.

Nov-11-16  diagonalley: yippeee! WCC starts today :-) ...AND... managed to solve a friday puzzle... well, as far as <al wazir> (as usual)
Nov-11-16
Premium Chessgames Member
  morfishine: <19.Rxd6>
Nov-11-16  saturn2: RxB QxR so far I agreed with the game. To justify the exchange sacrifice I went for 20 a3 and then bring the queen to h4. If black played 20 ..h6 my follow up moves were Rd1 Qh4 and Bd4 later on.
Nov-11-16  gofer: The first two moves are obvious...

<19 Rxd6 Qxd6>
<20 Ne4 ...>

This loses the exchange, but wins a piece, so white nets B+N for R.

20 ... Qe7/Qf8
21 Bc5

Blacks position is horrible having lost a piece and control of the dark squares around its king and also still with Nf6 as a threat in lots of scenarios, so I doubt black will choose this option.

<20 ... Qe4>
<21 Qxb4>


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Okay, we are winning, but what will black reply?! Re8? Rb8? Bc8? What is our plan? Not sure, but we can afford to be a little bit risky, but part of me likes Nc5 followed by Nd3 and Qh4...

~~~

Hmmm, not even close to the main continuation like many others...

Nov-11-16  mel gibson: This was fairly easy to see - took me about 3 minutes to analyse it.
Nov-11-16
Premium Chessgames Member
  whiteshark: Picked up 19.RxBd6 rather quick. Intuitive, not much further calculation. ♗e3 is stronger than any bl♖, due to black's kingside pawn structure / weakness

(I thought 20...Qe7/f8 was necessary missing 21.Bc5. Also missing 20...Qe5) but ok...

Nov-11-16
Premium Chessgames Member
  thegoodanarchist: I wasn't sure what to play. Must be the weekend!
Nov-11-16
Premium Chessgames Member
  patzer2: In the final position (diagram below),


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Black has nothing better than 33...Rh8 allowing 34. Bf6+ (+9.76 @ 23 depth, Deep Fritz 15).

If 33...Rg8, to avoid the loss of the exchange, then 34. Bf6+ Kf8 35. Rd1 [#12 @ 33 depth, Deep Fritz 15 (diagram below)]


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wins as Black is forced to give up the Bishop to delay mate.

Nov-11-16  drollere: i wouldn't sacrifice the exchange without a clear view of what came next. i didn't have a clear view of what came next.

specifically, black can defend the N fork at f6+, so Ne4 did not seem to go anywhere. and Bxh2+ is potentially a poisoned pawn.

instead i looked for something along the lines of Nxh7, Kxh7 and after a3, Nd5, Qh4+.

Nov-11-16  YouRang: <An Englishman><Also, was 16...Na6 the best move? I would have played ...Nd7 to redeploy the Knight to f8 or f6 if needed.>

The problem with 16...Nd7 is that <17.Qd2!> wins a piece.


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Either the bishop or knight falls, and with the N on d7, black can't protect the bishop with ...Rd8.

It seem then that 16...Na6 was black's best move. However, it remained a target after 18.Qa4, and black still could not get out of trouble.

Black was pretty much lost after taking the poisoned pawn with <15...Nxc5> (15...Be7 was better, but it's hard to see why).

Therefore, IMO Dreev's great move was <14.c5!>.


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Although not "winning" outright, it was the deep move that created the successful poisoned-pawn trap for black which ultimately led to his downfall.

Nov-11-16  Cheapo by the Dozen: I gave up quickly after not finding anything at h7.

Ne4 never crossed my mind.

Nov-11-16  RandomVisitor: After 18...Nb4


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Komodo-10.1-64bit:

+3.73/41 19.Rxd6 Qxd6 20.Ne4 Qe5 21.Qxb4 a5 22.Qd4 Qxd4 23.Bxd4 Red8 24.Bf6 Rd5 25.Bc3 Kf8 26.Nf6 Rdd8 27.Nxh7+ Kg8 28.Nf6+ Kf8 29.Rc1 a4 30.Bf3 Ra7 31.Bb4+ Kg7 32.Bc5 Raa8 33.Be7 a3 34.bxa3 Rd3 35.h3 Ra7 36.Ne8+ Kg8 37.Bc5 Raxa3 38.Nd6 Ba8 39.Bxa3 Rxa3 40.Rb1 f5 41.Rb2 Kg7 42.Ne8+ Kf7 43.Nc7 Ra7 44.Nxa8 Rxa8 45.Bxc6 Ra3 46.g3 g5 47.Kh2 Kg6 48.Kg2 Kf6 49.Bd7 Ke7

Nov-11-16  dark.horse: Nice exploitation of the dark squares.
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