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Roberto Grau vs Herman Pilnik
Argentina (1938)
Indian Game: Pseudo-Queen's Indian. Marienbad System (A47)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 3 ·  Later Kibitzing>
Aug-18-10  swr: White should be able to squeeze out a win after 34. Nc4 bxc4 35. bxc4 Re5 36. Bxc4 Nxd4 37. Rxd4 Rxd4 5. Rxd4, gaining a passed pawn. He should be able to queen it quite safely.

What is your opinion?

Aug-18-10  Marmot PFL: Bd4 is pinned, and attacked 3 times, but also defended 3 times. Another attacker wins, and b4 and Nb3 does it.
Aug-18-10  Patriot: This was much easier to see than yesterday's problem.

<<JG27Pyth>: I found b4 without too much trouble but can someone explain the winning procedure from the final position.>

To answer this, what are black's options? 46...Bxh4 is out of the question since 47.Rxa7 wins. If the black king strays from f6, 46...Kf4 47.Ke2 Bd4 48.Rd7 Bc6 49.Rg7 wins g6 and h5 is weakened. Or perhaps 46...Kf6 47.f4 to restrict the black king and to help the white king safely march toward a7 without any ...Kf4 ...Kxf3 possibilities.

I could be wrong on this since I have not been playing well lately.

Aug-18-10  ReikiMaster: [JG27Pyth: I found b4 without too much trouble but can someone explain the winning procedure from the final position.] Black obviously can't afford 46..Bxh4 47.Rxa7. Therefore g6-pawn can only be defended by the black King. This leaves the white King free to attack blacks pawns. If black tries to block Ka8 and Rxa7 with his King, white plays Rg7 instead.
Aug-18-10
Premium Chessgames Member
  agb2002: The material is even.

The black bishop is pinned, which suggests 34.b4 to add the knight to the attack with 35.Nb3:

A) 34... Bxb2 35.Rxd5 Rb6 36.Rd7 + - [R vs B].

B) 34... Nf4 35.Rxd4 Rxd4 36.Rxd4 Rxd4 37.Bxb4 + - [B]. Unfortunately for Black, the white king is not on g1, allowing a knight fork on e2.

C) 34... Rd8 35.Nb3 R5d6 (with the intention 36... Be5) 36.Nxd4 + - [B], followed by Nb3, protecting the rook on d2.

Aug-18-10  ZUGZWANG67: Material is equal. White has pressure against the BB: it is attacked and defended 3 times. If Black takes the Bb2 he loses the exchange. That is because the Rd5 would suffer a disadvantage in it's ratio of attack vs defense; 2:1. Is it possible for W to disturb the equilibrium regarding the Bd4 so that the latter could be captured? Yes; by simply playing 34.b4 followed by 35.Nb3. I don't see anything B could do to add up extra protection to his bishop. Thus he can only lose the exchange: 34.b4 Bxb2 35.Rxd5 (35...Rxd5 36.Rxd5 Bc3 37.Nc6).

Time to check.

--------

This is it. Cool!

Aug-18-10  ZUGZWANG67: <<TheaN>: 3/3 I kinda saw the simple idea of b4 and Nb3 but thought this was too slow... hm, now that I see it I'm wondering why I thought that; <I would have played this ingame so I consider it solved but my mental waylays are a bit awkward.>>

I think you expect too much from a puzzle.

Aug-18-10
Premium Chessgames Member
  ClassZPlaya: Reviewing the game, I don't know why White didn't capture the unprotected Knight with 26. Qxg5. Is the game score correct or am I missing something?
Aug-18-10  OBIT: <ClassZPlaya>You have a point. I also would like to know why White can't play 26. Qxg5.
Aug-18-10  chessgolfer: <ClassZPlaya:> Reviewing the game, I don't know why White didn't capture the unprotected Knight with 26. Qxg5

I believe a closer look will show that after 26. Qxg5 Black will serve mate with Qh1

Aug-18-10  scormus: Even if yesterday wasnt, this a definitely a material winning puzzle. W wants to grab that uncomfortable B on d4 but cant seem to get quite enough onto it. So a bit of cunning is needed

34 Ba3 looks like the move. 34 ... Rd7 35 Nc6. Possibly there ate other moves that would win. Not sure what B's best bet is, perhaps there isnt one? 35 .... 1-0 ?

Better check, I expect I missed something

Aug-18-10
Premium Chessgames Member
  chrisowen: Tripilng row the rooks dfile doesnt work. Quite move 34.b4 bade farewell to raucous bishop in. It is cardinal sin Herman rummaging b5 black allow Na5 clubs d4. Exchange sac rooks cakewalk the rest.
Aug-18-10
Premium Chessgames Member
  kevin86: A real tough week-this one.
Aug-18-10  CapablancaFan122: Wow, I didn't get this one. I looked at Nc6 followed by Rxc6, but that doesn't go anywhere. <kevin86> It indeed is a really tough week.
Aug-18-10  KNIGHTSTALE22: It took me sometime to find b4 and Nb3, because like LIFE master AJ, I was looking for something spectacular. It gets me to wonder whether I carry this illness of thought into my OTB games? Am I looking at too many fancy ideas and hot shot killer moves, when in reality, simple plans and simple chess is the way forward 90% of the time!!
Aug-18-10
Premium Chessgames Member
  ClassZPlaya: <OBIT> Thanks! Yeah, mate-in-one is pretty stong. Embarrassing that I missed it. :-(
Aug-18-10  ZUGZWANG67: <LIFE Master AJ>: Simple puzzle. (34.b4 and 35.Nb3 " ") Not very satisfying though. Maybe I am too used to the spectacular, and the "HUM-DRUM" win of material here is not the kind of CG fare that I have gotten used to. Am I being overly critical?

It's hard to answer your question. Nevertheless I think that we are being served very good puzzles this week. This forces us to analyse the position and not only looking for a Q-sac.

Peace!

Aug-18-10  Seaholme: After Ba3 i think i would play 34 ... b4
And after 35.Bxb4(forced) 35 ... Ra6 and I can't see any good continuation for white

<Willber G:, <OhioChessFan: 34. Ba3 Ra6>

35. Nc6 RxB
36. Ne7+ winning the exchange>
, what about 35 ... RxN?)

Aug-18-10
Premium Chessgames Member
  patzer2: For today's puzzle position, the little clearance 34. b4!, White is able to pile on and overload on the pinned piece with 35. Nb3 to win decisive material.

Earlier, Black missed his chance of winning twice with either 21...b5! or 22...b5! .

The losing move was 22...f6?! Instead, 22...b5! 23. Na5 f5! is winning.

Aug-18-10  YouRang: Got it after a minute or so. It was pretty clear that the focal point is the pinned (but adequately guarded) black bishop on d4. Naturally, I really wanted to attack that bishop again.

It took a while for it to dawn on me that black didn't have any quick way to help his bishop get out of trouble. That bishop isn't going anywhere, so I have time to vacate b3 with 34.b4! so that my knight can attack the bishop from there next move.

There doesn't seem to be any way for black to avoid losing the exchange. Nothing brilliant, but good basic chess.

Aug-18-10  lost in space: LHM, this took me ages (most probably due to my negative IQ).

I was looking to more or less every knight-move and recognized that there is no way to squeeze a win out of the position...Then I recognized that Nb3 wins if there would not be an own pawn on b3. And then everything was crystal clear.

34. b4! Kg7 (example) 35. Nb3 Black is completely helpless.He can not avoid that White will win Bd4

Nice and harder than medium

Aug-18-10  RandomVisitor: After 34.a3:


click for larger view

Rybka 3: <25-ply>

[+1.93] 34...b4 35.axb4 a6 36.b5 axb5 37.b4 Bxb2 38.Rxd5 Rb6 39.h5 Kg7 40.Rd6 Rxd6 41.Rxd6 Nd4 42.Nc6 Nxc6 43.Rxc6 Ba3 44.hxg6 hxg6 45.Ke2 Bxb4 46.Rb6 Be7 47.Rxb5 Bd6 48.h3 Kh6 49.Rb6 Bf4

[+2.36] 34...Kf7 35.b4 Bxb2 36.Rxd5 Rxd5 37.Rxd5 Nd4 38.f4 Ke6 39.Rd8 Kf7 40.Kg2 Ke6 41.Kg3 Ne2+ 42.Kf3 Nd4+ 43.Kg2

[+2.36] 34...Kf8 35.b4 Bxb2 36.Rxd5 Rxd5 37.Rxd5 Nd4 38.Kg2 Kf7 39.f4 Ke6 40.Rd8

Aug-18-10  M.Hassan: <once: What I find interesting is....> Very concise and instructive explanations. Thank you
Aug-18-10  jimmyjimmy: I had to travel for my job last night so I didn't get to see the answers for yesterday's quiz. I bombed out today. I had to travel a lot and I couldn't concentrate. How do I see the kibitz comments from yesterday? I want you to know my hometown of Saint Louis,Missouri,USA has been chosen for the U.S. Chess Hall of Fame. We are very proud. I will play any of you for my dues at that club. If I lose I will give you as many St. Louis style pork steaks as you can eat. Any takers?
Aug-18-10  wals: Just way out of my league. Back for more chess gene therapy.

Black's blunder:-

32...b5. +2.34.

Available:-

Analysis by Rybka 3 1-cpu: depth 19:

1. = (0.00): 32...Kf7 33.Ne3 R5d6 34.Nc4 Rd5[] 35.Ne3 R5d6 36.Nc4 Rd5[] 37.Ne3 R5d6 38.Nc4 Rd5[] 39.Ne3 R5d6 40.Nc4 Rd5[] 41.Ne3 R5d6 42.Nc4 Rd5[] 43.Ne3 R5d6 44.Nc4 Rd5[] 45.Ne3 R5d6 46.Nc4 Rd5[] 47.Ne3 R5d6

2. = (0.00): 32...Kf8 33.Ne3 Re5 34.Nc4 Red5[] 35.Ne3 Re5 36.Nc4 Red5[] 37.Ne3 Re5 38.Nc4 Red5[] 39.Ne3 Re5 40.Nc4 Red5[] 41.Ne3 Re5 42.Nc4 Red5[] 43.Ne3 Re5 44.Nc4 Red5[] 45.Ne3 Re5 46.Nc4 Red5[] 47.Ne3 Re5

3. (0.45): 32...R5d7 33.h5 Kf8 34.Ne5 Bxe5 35.Rxd7[] Rxd7 36.Rxd7[] Bxb2[] 37.Rxa7 gxh5 38.Rxh7 Nf4 39.Rh6 Bd4 40.Rd6 Be3 41.Rf6+ Ke7 42.Rxf5 Ke6 43.Rf8 Ke5 44.Re8+ Kd4[] 45.Re4+ Kd3[] 46.a4 Bd2[] 47.h4 Kc2[]

4. (0.73): 32...f4 33.Bc3 b5 34.Na3 b4[] 35.Bxb4[] Nc7 36.Be7 R8d7[] 37.Bg5 Kf7 38.Bxf4 Be5 39.Be3 Rxd2 40.Rxd2 Rxd2 41.Bxd2 Bxh2 42.Kg2 Bd6 43.Nc4 Bc5 44.Kg3 Nd5 45.a3 Ke6 46.b4 Be7

5. (0.86): 32...h6 33.f4 h5 34.Bc3 Kf7 35.Na3 Ke7 36.Nc2[] Bxc3[] 37.Rxd5[] Rxd5 38.Rxd5 Nxf4 39.Rd1 Bf6 40.Nd4 a6 41.Nf3 Ne6 42.Kf2 Nf4 43.Rd2 Bc3 44.Rc2 Bf6 45.Ng5 Kd6 46.Kg3

Any one of these would have put Black in a more secure position.

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