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Steffen Pedersen vs Peter Heine Nielsen
"Great Danes" (game of the day Oct-03-2006)
Danish Championship (2003), Horsens DEN, rd 9, Apr-20
Slav Defense: Czech Variation. Classical System (D18)  ·  0-1

ANALYSIS [x]

FEN COPIED

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sac: 34...bxa4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-03-06  Mendrys: While Being a pawn down I don't think white's was facing immediate disaster until 34. Na2. He should have taken the b pawn 34.axb5. While still lost I think this gave him the best chance of holding out.
Oct-03-06  lvlaple: 14... Bxc3 15. bxc3 Bxe4 looks good to me... Black up two pawns.
Oct-03-06  Timothy Glenn Forney: <Manic> Yes thats the game,thanks anti- moscow variation of the semi- slav.Which he wrote about in his book.
Oct-03-06  Larsker: Peter Heine Nielsen is about 2 meters tall (6 foot 5 inches).
Nov-03-16
Premium Chessgames Member
  Phony Benoni: Rook can't get out, but can we get a little of the ol' passed pawn bypass going with 34...bxa4 35.Nxb5 axb4 and 36...a3. I'll bet White can't stop that pawn without material concessions.
Nov-03-16  diagonalley: nice puzzle!
Nov-03-16
Premium Chessgames Member
  patzer2: Wasn't sure it was winning, but for my Thursday post World Series (Cubs win for the first time in 108 years) puzzle solution, I couldn't resist swinging for a home run with the exchange sacrifice 34...bxa4 35. Nxb4 axb4 .

I deviated after 36. Rc4 with 36...axb4 (-3.54 @ 20 depth, Deep Fritz 15).

Although my try 36...axb4 wins, the computers rate the game continuation 36...a3 (-4.72 @ 20 depth, Deep Fritz 15) as better.

P.S.: For a White improvement, I'd look to the opening and replace 9. Ne5 Nxe5 (-0.51 @ 34 depth, Stockfish 7) with 9. Nh4 = (0.16 @ 34 depth, Komodo 10.1 64 bit) as in White's win in Ponomariov vs E Najer, 2016.

Nov-03-16  Boomie: 38. Kf1 seems to put up some resistance.

38. Kf1 Nc2 39. Ree1 a1=Q 40. Rxa1 Nxa1 41. Rxa1


click for larger view

I'm sure there's an easy win here, perhaps starting with 41...Rd2, but I'm too lazy to give it to the engine.

Nov-03-16
Premium Chessgames Member
  patzer2: <poachedeggs> IMO White was on the edge of losing well before 28. Re3 or 29. Ke1, and those two moves seem about as good as any in a bad position.

White's fate was clearly sealed with the mistake 34. Na2?, allowing our Thursday puzzle solution 34...bxa4! .

Instead, 34. axb5 Rxb5 to might have given some practical chances for Black to go wrong and let White back in the game.

White's initial problems appear to start in the opening when he loses the advantage of the first move with 9. Ne5?! Nxe5 (better is 9. Nh4 =).

After 9. Ne5?! Nxe5 , Black appears to slowly but surely increased his advantage until it became decisive.

Nov-03-16
Premium Chessgames Member
  agb2002: Black has an extra pawn.

White threatens Nxb4.

The rook on b4 is trapped, something Black seems to have deliberatelly allowed because of 34... bxa4 35.Nxb4 (35.bxa4 Rxa4 - + [2P]) 35... axb4:

A) 36.Rd3 Nc2+ and 37... Nxe3 - + [2P].

B) 36.Rc4 axb3

B.1) 37.Rxb4 Nc2+ and 38... Nxb4 - + [N+3P].

B.2) 37.Kd1 Nc2+ as above.

B.3) 37.Kf2 Nc2

B.3.a) 38.Re2 b2 wins decisive material.

B.3.b) 38.Rxc6 Nxe3 39.Kxe3 b2 wins.

B.3.c) 38.Rg3 b2 39.Rg1 Rd2+ 40.Kg3 (40.Kf1 b2=Q(R)#) 40... Rd3+ 41.Kf2 Rc3 42.Rxc3 bxc3 followed by Na3 wins.

C) 36.Rc1 axb3 followed by Ra7 (37.Ra1 Nc2+) and Ra2 with three passed pawns for the exchange looks winning.

Nov-03-16
Premium Chessgames Member
  agb2002: I had the impression that 36... axb3 was simpler than 36... a3. Actually, it is not and led me to the blunder 37... Nc2 which allows 38.Rxb3 (37... Rb7 looks necessary).
Nov-03-16  AlicesKnight: I saw the main idea though I also looked more at ...axb3 possibilities and missed quite how many ways the N fork could be worked. The offer of N-swap at move 9 leads White to the loss of a P, while the withdrawal from the N-swap possibility at move 33 proves to be fatal later - interesting di-theme.
Nov-03-16
Premium Chessgames Member
  WorstPlayerEver: Time for the sneaky pawn moves :)
Nov-03-16  Troller: <Boomie: 38. Kf1 seems to put up some resistance.

38. Kf1 Nc2 39. Ree1 a1=Q 40. Rxa1 Nxa1 41. Rxa1 >

39..Nxe1 keeping a2 would be the way I think. Either 40.Rxe1 Rd2 or 40.Kxe1 and then ..Rd4 or ..Ra7 followed by King march and/or ..Ra3.

Nov-03-16
Premium Chessgames Member
  patzer2: Correction: After 36. Rc4, I mean to say <like agb2002> I went for 37...axb3 <not 37...axb4>.

<agb2002> is correct in asserting that after 36.Rc4 axb3 37. Kf2 the strong winning follow-up <37...Rb7> is best ( or to use his word <necessary>).

Deep Fritz 15 indicates Black is clearly winning after 36. Rc4 axb3 37. Kf2 Rb7! 38. h4 b2 39. Re1 Nb3 40. Ke3 Nc1 41. Rexc1 bxc1=Q+ 42. Rxc1 b3 43. Kd3 b2 44. Rb1 Rb4 45. Kc3 Rxe4 46. Rxb2 Rxg4 (-5.07 @ 27 depth, Deep Fritz 15).

Nov-03-16
Premium Chessgames Member
  patzer2: <Boomie: 38. Kf1 seems to put up some resistance.>

After 38. Kf1, Deep Fritz 15 indicates White is busted after 38...Ra7 (-10.00 @ 23 depth).

Two obvious threats after 38. Kf1 Ra7 (diagram below)


click for larger view

are 39. Ree1 Nxb3 (-14.72 @ 20 depth) and 39. Ra1 Nc2 (-13.90 @ 22 depth).

Nov-03-16
Premium Chessgames Member
  Sally Simpson: Patzer 2 seems to have it correct.

The whole idea was seen by Black here


click for larger view

when he played 33...b5 usually blocking in a Rook like this fatal but Black knew what they were doing.


click for larger view

35.Nxb4 axb4 and White realised his plan. Got as far as here.


click for larger view

Seeing 36.Rc5 getting behind the passed pawn with Ra5 fails to 36...axb3. All Done.

Which brings us onto the much maligned 9.Ne5 and C.G. mystery No.781.

Polugaevsky vs Drasko, 1987

However here:

http://www.365chess.com/game.php?gi...

and here...

http://www.d2d4.info/en/games/11229...

We see Darga playing 8...Nd7 Polugaevsky playing 9 Ne5 in this position. The same position as in the above game.


click for larger view

All the games marge back into the same position on move 12.

Nov-03-16  Cheapo by the Dozen: Terrible starting point for the puzzle. Black's course was obvious.

<Sally Simpson> highlighted a much better alternative.

Nov-03-16  YouRang: Thursday 34...?


click for larger view

Black is up a pawn, but his Rb4 is unable to escape Nxb4. However, black can create an escape with <34...bxa4> (by vacating b5) while also picking up a pawn and threatening to make a passer.

If white wants the rook, white has to take it now: <35.Nxb4 axb4>


click for larger view

White has to move the rook, e.g. <36.Rc1>, and then <36...a3>


click for larger view

I haven't calculated all the variants from here, but I'd say the protected black passer on a3 with support from Nd4 and Rd7 is more than adequate compensation for the exchange. The N in particular is in a wonderfully forky position.

Nov-03-16
Premium Chessgames Member
  kevin86: Black's rook is trapped, but white's comes to grief!
Nov-03-16  PJs Studio: I got all of blacks moves but 35.Nxb4? Really?? NOT a good idea. White just wanted to prove 34.Na2 wasn't a stinker.

I thought white should just chuck the a pawn with 35.bxa4 (silicon monster agree?)

Nov-03-16  drollere: the sacrifice is even nicer because the N on a2 has little more effect than a pawn. it attacks as few squares as it did at move 1.

bishops work best at the board sides, N's in the center.

Nov-03-16
Premium Chessgames Member
  Dionysius1: I got this by the simplistic argument that for less than the price of an exchange sacrifice I could have connected passed pawns on my 5th. From there whoever's playing Black can darned well win it.
Nov-03-16  devere: <PJs Studio: I got all of blacks moves but 35.Nxb4? Really?? NOT a good idea. White just wanted to prove 34.Na2 wasn't a stinker.

I thought white should just chuck the a pawn with 35.bxa4 (silicon monster agree?)>

35.bxa4 Rb2 followed by 36...Nc2+ wins. White is simply lost after 34...bxa4.

Nov-19-16  PJs Studio: as he is after Nxb4? also. Guess the best move was to resign. :(
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