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Amos Pokorny vs Karl Berndtsson Kullberg
"Pyramid Scheme" (game of the day Sep-15-12)
Hamburg ol (Men) 1930  ·  King's Indian Defense: Four Pawns Attack (E76)  ·  1-0
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Last move:

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sac: 30.Rxe5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Sep-15-12
Premium Chessgames Member
  Phony Benoni: Not so much a pun as a description of White's pawn structure after <27.e6>:


click for larger view

A couple of Kamikaze Rooks quickly decide matters soon afterward.

Sep-15-12  vinidivici: wow nice pawns formation.

kings indian, 4 pawns attack is a "hard-easy" opening to use. Very aggressive pawns attack in consequence the weaker defense in the back rank.

But Amos utilize the pawns very with the attack from the king side.

Sep-15-12
Premium Chessgames Member
  Abdel Irada: Two observations:

(1) I've seen this game before, and it's all <Phony Benoni>'s fault.

(2) This is not a Four Pawns Attack. It's a Seven Pawns and the Kitchen Sink Attack. (And it was the sacrifice of the second kitchen sink that sealed the outcome.)

Sep-15-12  scholes: Black was just waiting for his imminent death. Shuffling his pieces in his back rank, waiting for white to finish the game. Reminds me of my openings, when i have nothing to do but wait after the opening phase is over.
Sep-15-12
Premium Chessgames Member
  King Sacrificer: Maybe the pun could be Amos Moses. It looks like he was trying to divide the board into two pieces.
Sep-15-12
Premium Chessgames Member
  Once: Very rare to see a perfect pyramid on the board. Black may have been trying to block the position for a draw, but white's strong rook sacrifices put paid to that.

I loved the sequence from 32. Rxf6 to 34. Rh8# Three successive rook sacrifices, none of which can be accepted. Very pretty.

Sep-15-12
Premium Chessgames Member
  Shams: Opening the h-file was unnecessary: simply 28.Rxe5 right away decides.
Sep-15-12  wareopening: Benoni>Not so much a pun as a description of White's pawn structure after <27.e6>:

So your parents were never involved in a pyramid scheme?

Sep-15-12  sfm: Liked the pun!
Sep-15-12  mucher1: Have to agree with <Shams>... the immediate Rxe5 followed by f6 and Qd3 (threatening Qh7 and Rxf6) would've been more clinical.
Sep-15-12
Premium Chessgames Member
  Once: <mucher1, Shams> I'm not so sure.

If I let Fritzie loose on the position, he does prefer 28. Rxe5 to 28. h4. And I'm guessing that's what you've noticed too?

But computers are notoriously poor at evaluating blocked positions. The problem is that the resolution of the position lies too far outside their horizon.

So let's take a look at 28. Rxe5


click for larger view

Sure, black loses quickly if he recaptures. 28...fxe5 29. f6 and a later Qd3 and black can resign with a clear conscience. But what if black doesn't recapture? What if he plays a pass move lke 28...Rf8?


click for larger view

Right now, Fritzie is shouting out that white has an advantage of +6. He has stolen a knight in broad daylight and has a clear space advantage. But how is he going to win? Black is threatening to hunker down behind a barricade of pawns. An advantange of a knight doesn't mean anything if the position is blocked. A silly example:


click for larger view

Draw!

Back to today's game. At some point white is going to break down the the black pawns. He is going to need a move like h4 to lever open the fortress. So why not get the move h4 in straight away? It's not as if the Ne5 is going anywhere.

So while the computer may get excited about 28. Rxe5, I don't see that it is a clearer win than 28. h4 unless black obligingly plays into the attack with 28...fxe5.

Whilst not objectively best in computer terms, I think 28. h4 is clearer and easier for a human to play OTB.

Sep-15-12
Premium Chessgames Member
  lost in space: Even with additional rooks on b2, c3, d4, e5, f4 and g3 the game is draw if Black only moves with his king
Sep-15-12
Premium Chessgames Member
  Once: That's true, although if we had all six extra white rooks it would be a draw by stalemate because white would have no legal move.

Of course, if we want to get really silly we can turn the amp all the way up to eleven ...


click for larger view

Sep-15-12
Premium Chessgames Member
  AylerKupp: Here is a composition I've posted before by W.E. Rudolph, 1912 from Hans Kmoch's classic "Pawn Power in Chess". White to move and draw:


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1.Ba4+ Kxb4 2.b3+ Kb5 3.c4+ Kc6 4.d5+ Kd7 5.e6+ Kxd8 (Black could have sidestepped the bishop capture but it doesn't matter) 6.f5.


click for larger view

The position is sealed, draw in 50 more moves. Not what one usually thinks of when referring to the two bishop sacrifice. Pyramids rule!

BTW I had one, maybe two engines analyze this some time ago and none of them found 1.Ba4+.

Sep-15-12  Riverbeast: This game was played before they knew how to play the KID correctly
Sep-15-12
Premium Chessgames Member
  The Last Straw: <AylerKupp> Note that at the end if black's bishop was light-colored, he could just sac it and win.
Sep-15-12
Premium Chessgames Member
  kevin86: Could this game be called "the eight pawns attack"? A whimsical game,leading to a nice win by Pokorny.

OR a KORNY game...

Sep-15-12
Premium Chessgames Member
  thomastonk: <AylerKupp: I had one, maybe two engines analyze this some time ago and none of them found 1.Ba4+.> Fortress detection is even today an unsolved issue for a normal engine (maybe the endgame engine Freezer could do). In Rudolph's example even the position after 6.f5 cannot be "understood" before depth 100 is reached.
Sep-15-12
Premium Chessgames Member
  Phony Benoni: <Once> Your "silly" position reminds me of the game J H Donner vs Smejkal, 1975. Here's the position after <34...b6>:


click for larger view

And the game proceeded:

<35.Kf2 Kg7 36.Ke2 Kf8 37.Kf2 Ke8 38.Ke2 Kf8 39.Kf2 Kg8 40.Ke2 Kh7 41.Kf2 Kh8 42.Ke2 Kg8 43.Kf2 Kh8 44.Ke2 Kg8 45.Kf2 Kf8 46.Ke2 Kg7 47.Kf2 Kh7 48.Ke2 Kh8 49.Kf2 Kh7 50.Ke2 Kh6 51.Kf2 Kg7 52.Ke2 Kh7 53.Kf2 Kh6 54.Ke2 Kg7 55.Kf2>

resulting in this position:


click for larger view

Kavalek explains in the tournament book that Smejkal was wanting to adjourn the game so he could find the win in analysis. This could only happen after five hours of play. In those days, the normal time control was 40 moves in 2.5 hours, so adjournments usually came just after move 40.

So Smejkal just started moving his king to reach 40 moves. The problem was that Donner had been moving quickly the entire game, and at move 40 they were nowhere near five hours. So the game had to continue, and Smejkal spent so much time stalling and watching for triple repetitions that he was in danger of losing on time at the second time control on move 56!

But he finally got his adjournment, and wrapped up the game easily upon resumption. Kavalek expressed surprise that the Black king did not get a heart attack.

Sep-15-12  Conrad93: 34.Bh7+ also works.
Sep-15-12
Premium Chessgames Member
  Shams: <Once> <If I let Fritzie loose on the position, he does prefer 28. Rxe5 to 28. h4. And I'm guessing that's what you've noticed too?>

Sometimes I even find good and original moves on my own, so it won't do to have people thinking that even my obvious moves are found with an engine.

Not that it matters, but I rarely use engines to analyze and always say when I do. As proof of this I would point to the error rate in my analysis, which is more than high enough to keep my chess ego in check.

I do that for a reason, which is that I think the site is both more fun and more educational if there are mistakes in posted analysis. Finding improvements in these lines is like finding easter eggs, and there's no easter-egg hunt in long engine lines.

Back to the game-- what I should have written was that there was no reason for White to wait to rip on e5, after Black has played his Knight there. Yes, if Black doesn't open lines by recapturing than of course we open the h-file.

Sep-16-12  mucher1: <Once>... I wasn't relying on computer analysis either... which might be why declining the exchange sac didn't occur to me. Having to defend a clearly hopeless position is an unattractive option to most human players. Good point about the knight not going anywhere, though.
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