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David Bronstein vs Jose Luis Alvarez del Monte
Mar del Plata (1960), Mar del Plata ARG, rd 8, Apr-07
Queen's Gambit Declined: Modern. Knight Defense (D51)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Sep-29-10  gofer: Bronstein makes this look so simple.

By 37 g4 ... he is already planning for his king march Kd2/Kc1/Kb2/Ka3/Kb4/Kb5 and it is all so clear, exact and great to watch. Moves like Bf3 in the vain attempt to capture Ph5 just show how little black has in the way of counter-attack and that this game was lost well before we get to our position at move 47!

Sep-29-10
Premium Chessgames Member
  agb2002: The material is even.

Black threatens to push his a- and h-pawns when appropriate.

White's d- and g-pawns are already advanced enough as to suggest 47.d6:

A) 47... bxc4 48.Bxc4 Bc6 49.Be6 and Black can't stop the threat 50.d7 (49... Ke8 50.g7 + -).

B) 47... Bc6 48.Be4

B.1) 48... Bxe4 49.g7+ (or 49.d7 Ke7 50.g7 Bd5 51.cxd5 + -) Kxg7 50.d7 + -.

B.2) 48... Bd7(e8) 49.c5 followed by 50.c6 winning.

Sep-29-10
Premium Chessgames Member
  whiteshark: Hump day!
Sep-29-10  zb2cr: I saw this one. I appreciate the good commentary by <Jimfromprovidence>, <CHESSTTCAMPS>, <asiduolego>, <dzechiel>, <VincentL>, <Once>, <scormus>, <gofer>,and <agb2002>.
Sep-29-10  El Trueno: White to play 47.?

47.d6 Bc6 48.Be4 Be8 49.c5 and 50.c6 etc. should win because black's king has to be in kingside to prevent white's pawn to move g8=Q.

So black's bishop must defend against 2 pawns and a bishop. He will fail in this.. so it is win for white

Time to check

Sep-29-10  Patriot: One of the first things I looked at was 47.Be2 Bxe2?? 48.d6 and one of the pawns will promote. But black doesn't have to play that game. He can play 47...Be4 for example.

I also saw that 47.d6 Bc6 48.Be4 is possible and good, but didn't look at pushing the other passer. After a move like 48...Bd7 I seemed bent on 49.cxb5?.

Needless to say, I failed to come up with a winning idea in this "medium/easy" problem. It seemed that the c4-c5 push presented a blindspot because that move is simply crushing.

Sep-29-10  Everett: I wonder what the adjournment was like, when it happened, etc. I'm glad those are gone.

This would be a nice game for a collection on Bronstein's endgame know-how, like his '53 win over Reshevsky.

Sep-29-10  Touchmove: My thought process was the opposite of yours Dzechiel. I also went with my gut and tried d6 first ("passed pawns must be pushed!") but I did not think about the g6 pawn till much later.

For me, the magic is seeing the two connected passed pawns, currently in so much danger, and wondering what can be done to keep them intact or clean house with a sole survivor. I looked at d6, c5 and cxb5.

After my 2nd or 3rd look at d6, I noticed the g6 pawn would keep the king away from the d file and that was when I realized white had the potential to deflect the black bishop.

I still flirted with cxb5, or even 47. d6 Bc6 48. cxb5, but the capture ultimately looks like a loser. 47. cxb5 axb5 48. Bxb5 Bxd5 and black has traded weaker pawns for stronger white ones.

Likewise 47. cxb5 axb5 48. d6 Bc6 and there is no c pawn to deflect the bishop.

So 47. d6 makes sense to me, but what I do not know, is why nobody here is suggesting 48. c5! It seems to me that after any black move, white can still play 49. Be4! and the final position is the same. Do we have a dual solution today?

Also, its worth mentioning that there is a clue to today's solution in black's previous move. After 46. d5, black was concerned about 47. d6+ which would force the black king to choose between losing the race with the g pawn or slowing down its bishop from reaching d7 because of check. So black played 46. ... Kf8, avoiding check and seemingly giving his bishop time to stop the d pawn. Alas, after the Be4 and c5 combination, black is still out of time, but the initial d6 is still a bit more obvious (to me at least) when seen in context.

Sep-29-10
Premium Chessgames Member
  kevin86: Black has as much success in chasing down the pawns as a dog has in chasing two rabbits. My bet is both bunnies get away.
Sep-29-10  dzechiel: <Patriot: One of the first things I looked at was 47.Be2 Bxe2?? 48.d6 and one of the pawns will promote.>

I thought of this too, and for a while I considered 47 Be2 to possibly be the key. But then I saw

47 Be2 Bxe2 48 d6 Bxc4 49 d7 Ke7

and realized that white was busted.

Sep-29-10  desiobu: I had the right idea, but for some reason I threw in the useless 48. cxb5 (I guess hoping for 48...Bxb5?? 49. BxB axb and the black king is overworked), however it allows black to accept the Bf3 and defend with Ke7 and Bd5.
Sep-29-10  YouRang: Well, this sure looked like a promotion tactic with the twin threats from the d and g-pawns.

I went with <47.d6 Bc6 48.c5> which I think wins handily since I now threaten 49.Be4 leaving the black bishop with nowhere to go.

If 49...Bxe4 then 40.g7+ Kxg7 frees the d-pawn.

If 49...Bd7, the 50.c6 and the connected pair of pawns cannot be stopped.

I see now that I didn't need <48.c5> since the immediate 48.Be4 also works. But it doesn't work any better IMO.

Sep-29-10  Touchmove: <YouRang> I agree completely with your assessment. 47. d6 is the key move, but after Bc6, white's c5 and Be4 are equally effective and probably should be played without any other moves in between no matter what black's 48 is.
Sep-29-10  VincentL: <Once>I saw that after 47.... Ke8 white wins with 48. d7+ or g7.

The line I was considering was not this, but that which follows Ke8 at move 50.

My solution is protracted because I did not have white playing Be4 early enough.

Sep-29-10
Premium Chessgames Member
  Once: <VincentL> Apologies - I misread your line numbers!
Sep-29-10  rapidcitychess: *Static*
Agent Pawn D, in.

We are running, running again. The
highway isn't fast enough, the woods aren't dark enough. Most likely, only one of us will make it. Over.

As always on these kind of missions, there's a sniper. Countless pawns have been taken down by this cold-blooded assassin.

Black Bishop.

What do we have on our side? Just the hope we can make it. Just a few squares until we turn on our enemies, but the highway seems to long. My supporter, C, looks at me seriously. "D, only one of us is going to make it. You can do it."

I knew that it was are only hope. If I get to the 7th heaven, then it's all over for The Organisation.

*Static*
Agent Pawn D, in. 6th rank and I'm still alive. G and I(D!) are just feet away. Over.

The Black Bishop is known to be the swiftest piece in the black army. Not as diabolical as the Queen, but still deadly.

His sight is ridiculously far, and he can travel in seconds to what he sees. Nobody knows why he moves crookedly, but all pieces below fear him.

D runs like lightning but he is soon aware of the presence next to him.

"It's over D."

But the black's bishops senses notify him that another is attacking him. With his mind going at a mile a minute, his figures out that killing his assailant will alow D to race on through.

Knowing this, he lays down his arms.

Bronstein while looking at the chessboard visualized this, so that is what he played.

Sep-29-10  wals: Analysis Rybka 4 x 64

Black: depth 24 : 6 min :
(+3.70):36...Bd5.
Best,
1. (1.26): 36...f6 37.h4 Kf8 38.g4 Ke7 39.g5 Bb3 40.Kd2 Bf7 41.Kc2 Be8 42.Kb3 a5 43.c4 Bf7 44.Be2 bxc4+ 45.Bxc4 Be8 46.Bd3 Bc6 47.Kc4 Bd7 48.Kc5 a4 49.Kb4 fxg5 50.hxg5[] Bc6 51.Bc2 Kd6

White: depth 24 : 6 min :
(+1.55):37.g4.
Best,

1. (3.30): 37.Be4 Bc4 38.d5[] Kf8 39.d6[] a5 40.Kd4 a4 41.Kc5[] Ke8 42.Bc6+[] Kd8 43.Kb4[] f6 44.h4 Be2 45.g3 Kc8 46.g4 Bxg4 47.Bxb5 Bxf5 48.Bxa4[] Bd7 49.Bd1[] Bc6 50.Kc5[] Kb7 51.Bg4 Be4 52.Be2

Black: depth 22 : 3 min :
(+3.57):37...f6.
Best,
1. (1.93): 37...Kf8 38.h4 f6 39.g5[] Kf7 40.Be4 Bc4 41.d5 a5 42.d6[] Bb3 43.gxf6 Kxf6 44.Kd4 a4 45.Kc5 a3 46.Bb1 Ba4

White: depth 24 : 4 min :
(+1.93):38.h4.
Best,
1. (3.57): 38.Be4 Bb3 39.d5[] Kf7 40.d6 a5 41.Bc6[] Bc4 42.h4[] Kf8 43.Kd4 Be2 44.Kc5 Bxg4 45.Kxb5 Bxf5 46.Kxa5 g5 47.hxg5 fxg5 48.Kb6 Kg7 49.Kc7 g4 50.c4[] Kf6 51.c5 Be6 52.Bd5 Bxd5 53.d7

Black: depth 22 : 3 min :
(+2.32):40...Kd6.
Best,
1. (1.50): 40...Bb3 41.h5 Kf8 42.Kd2 Bg8 43.Bf1 Bd5

Black: depth 20 : 3 min :
(+8.34):41...Bg8.
Available,
1. (3.76): 41...Ba2 42.Kf3 Ke7 43.Ke4[] Kd6 44.Kf4 Ke7 45.Be4[] Bg8 46.Bc6[] Kd6 47.d5[] a5 48.Bxb5[] Kxd5 49.h6 gxh6[] 50.Kg4[] Kd6 51.c4

2. (3.76): 41...Bb3 42.Ke4[] Bd5+ 43.Kf4[] Ke7 44.Be4[] Bg8 45.Bc6[] Kd6 46.d5[] a5 47.Bxb5[] Kxd5 48.h6 gxh6[] 49.Kg4[] Kd6 50.c4

White: depth 22 : 4 min :
(+2.11):42.Kd2.
Best,

1. (8.34): 42.Kf4 Bb3 43.h6[] gxh6 44.Kg4[] Bd1+ 45.Kg3[] Ke7 46.c4[] Bb3 47.cxb5 axb5 48.Bxb5 Ba2 49.Kg4 Kf8 50.Be2[] Bg8 51.Kg3[] Bb3 52.Kf4[]

2. (5.93): 42.Kf3 Bb3 43.h6 gxh6 44.Kg4 Bd1+ 45.Kg3[] Ke7 46.c4[] Bb3 47.cxb5 axb5 48.Bxb5 Ba2 49.Kg4 Kf8 50.Be2[] Bg8 51.Kg3[] Bb3 52.Kf4[]

Black: depth 23 :
(+10.47):43...Bf3.

and the only move to save Black was
44.c4(-0.59), from White and it just didn't happen.

Sep-29-10  patzer2: For today's Wednesday puzzle solution, 47. d6! Bc6 48. Be4 Bd7 49. c5 gives White a winning passed pawn roller.
Sep-29-10  M.Hassan: "Medium/Easy" White to play
Materials even

White is surely with the advantage as he has two sets of connected pawns as agains one in Black's position. Moreover, the two past pawns of White sitting on g6 and d5 are in my opinion "Destiny Makers". White pushes one to

47.d6!
Several combinations can happen from now on. I have studied two lines and bring them under:

47...........Bc6
48.cxb5 axb5
49.Bc2 Kg7
50.Bb3 Bd7
51.Be6 Bxe6
52.fxe6


click for larger view

Black should resign since one of the White pawns will be promoted before Black can promote. The other line will be shown in the next post!

Sep-29-10  karnak64: Lovely ending; thanks, cg.com, for the choice.

Again, it's one of those solutions that isn't terribly heard to come across, but still, it is so beautiful and elegant, a pleasure to see.

Sep-29-10  M.Hassan: ... If black wants to defend with the King:
47.d6 Ke8
48.cxb5 axb5
49.Bxb5+ Kd8
50.Bc4 Kd7
51.g7
And Black can not stop promotion of the g pawn.
Sep-29-10  AnotherNN: Rewind back the position to move 44 with White to play and we have a puzzle at least of "very difficult" status.
Sep-29-10  TheBish: Bronstein vs J L Alvarez, 1960

White to play (47.?) "Medium/Easy"

As the saying goes, passed pawns must be pushed!

47. d6! Bc6

More or less forced, as 47...bxc4 loses to 48. d7 Ke7 49. Bxc4 followed by g6-g7-g8.

48. Be4! Be8

Similar is 48...Bd7. After 48...Bxe4 49. d7 Ke7 50. g7 and the pawns can't both be stopped.

49. c5 h5 50. c6 h4 51. d7 and wins.

Sep-29-10  Patriot: <dzechiel> <I thought of this too, and for a while I considered 47 Be2 to possibly be the key. But then I saw

47 Be2 Bxe2 48 d6 Bxc4 49 d7 Ke7

and realized that white was busted.>

You're absolutely right! How did I miss that? :-|

Sep-29-10  LIFE Master AJ: My moves were d6, c6 and then Be4.

Guess it does not matter ...

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