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Marcus Packalen vs Lars Schandorff
Rilton Cup (1998), Stockholm SWE, rd 1, Dec-28
Sicilian Defense: Lasker-Pelikan. Sveshnikov Variation (B33)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
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Jan-17-13  mistreaver: Black to play. Thursday.Medium. 25...?
The first thought that struck me instantly was to sac the black's queen. 25...Qxf2 26 Bxf2 Rxf2
Now black has active pieces around white's king, and i think it is excellent compensation. I think white has choice between Nf3,Bf3 and perhaps Bf1 a)27 Bf3 Rf1+ and black wins
b)27 Bf1 Rxf1+ and again black wins
c)27 Nf3. This looks very sensible because it defends the h2 pawn. 27...Nh4, to remove the knight
28 Nxh4 Rxh2+
29 Kg1 Kh8, and it looks very difficult for white to defend against the simple threat of 30 ... Rg8 mate. At least i can't see it
I feel like something is missing, but i have no idea what. Time to check. ---
Ah, i missed Nf4 with the threat of Bg2 and Nh3 mate. My Nh4 loses to Nxe5, although even in my line white is by no means worse and in a hopeless position. I saw the queen sacrifice, but without visualising Nf4 it really made no point. Therefore zero for today, makin it 3/4 this week.
Jan-17-13  morfishine: <LTJ> On your problem, I would venture 1.Qe4 hoping for a perpetual after 2.Rxg6+ hxg6 3.Qxg6+

But Black simply plays 1...Rf1

Too simple?

Jan-17-13  zb2cr: I went for 25. ... Qxf2; 26. Bxf2, Rxf2 with minimal analysis. The sacrifice involved was small--Q for R+B--and Black has a number of interesting threats. ... Bxd4 followed by Rxd2 would win material, he also threatens ... Rxh2+, ... Nf4 looks threatening. Half credit for me.
Jan-17-13  LoveThatJoker: <morf> You're definitely on the right track, bro!

30...Rf1 31. cxd6

There are surprises for both Black and White in this continuation!

LTJ

Jan-17-13  morfishine: <LTJ> Sorry, I was thinking it was White to move; I'll look at this some more when I get back
Jan-17-13  snakebyt: Queen sac was an early choice for me and it worked.
Jan-17-13  David2009: M Packalen vs L Schandorff, 1998 Black 25...?

Black is a Pawn down. The obvious forcing line is 25...Qxf2 26.Bxf2 Rxf2 threatening 27...Raf8 which White forestalls with 27.Ne6. Black now has a perpetual check with 27...Rxh2+ 28.Kg1 Rg7+ when White cannot sensibly play for the win with Kf1 (it gives too many Black opportunities). I cannot see a forced Black win. Time to check:
====
White defended differently. Here's the puzzle position


click for larger view

colours reversed:


click for larger view

with a link to Crafty End Game Trainer:
http://www.chessvideos.tv/endgame-t...

After 1.Qxf7 Bxf7 2.Qxf7 Bxf7 3.Rxf7 (these moves refer to the colours-reversed diagram) to my surprise the EGT rejects 3...Ne3 in favour of 3...Kg8. Now White has an obvious draw by perpetual check and can look for more: rather than post a win here I leave to others the pleasure of finding it. Posts by <Abdel Irada> and <M Hassan> refute the 27.Ne6) defence with 27...Kh8!. <LTJ> suggests an interesting alternative win (27.Ne6 Nh4).

As a final check, here's the position with White to play at move 25:


click for larger view

when 25.Bg3 produces the puzzle position which Crafty EGT refutes with 25...Rxf2 etc (link http://www.chessvideos.tv/endgame-t...). Have fun exploring the various defences!

Jan-17-13
Premium Chessgames Member
  kevin86: the mating net gets tighter...and tighter.
Jan-17-13  deadlyduck: @LTJ: I am a bit puzzled about your reply to Morfishine! If 30..Rf1; 31.cxd6 there doesn't seem to be any big tactical shot required:-) Doesn't 31..Rxg1+ followed by Rf1++ end it pretty forcefully?
Jan-17-13
Premium Chessgames Member
  Jimfromprovidence: After the text 26... Rxf2, below, black has a mate threat beginning with 27...Nf4, seeing 28...Bg2+ 29...Nh3#


click for larger view

To stop that threat, I tried 27 a4?!, hoping for enough time to play 28 Ra3, then 29 Rg3. After 27...Nf4 28 Ra3, below, here is the position.


click for larger view

Black stops white's threat of 29 Rg3+ and wins nicely with 28...Bg2+, forcing 29 Kg1. The winning combination continues with 29...Bxd4, below.


click for larger view

The threat is 30...Rf1# so white has to give up his queen after 30 Qxd4 Nxe2+, ending up a piece down after the dust clears.

Jan-17-13  morfishine: Hi <deadlyduck> No, the problem is 1...Rf1 2.cxd6 Rxg1+ 3.Qxg1 Rf1 4.Qxf1 Bxf1 5.d7 and the pawn can't be stopped
Jan-17-13  LoveThatJoker: <morfishine> Your note to deadlyduck is spot on, man! Great stuff!

So, after 30...Rf1 31. cxd6, how does Black avoid all this stuff and win outright?

Analysis Diagram - Position after 31. cxd6


click for larger view

LTJ

Jan-17-13  deadlyduck: Ah- I think I see where my confusion comes from.
I had read Morfishine's post to include the "double move" Qe4...and had the Queen on the e4 square, whereas in fact it's still on d4. So the Queen is still on d4 and Black has played ..Rf1; cxd6.
Jan-17-13  deadlyduck: @ LTJ: Something like ..R8f2 (threatening Bg2++) seems good. Since d7 allows Bg2++ it appears that White must try one of the following:

(a) Qxf2 when ..Rxf2 leaves Black with a huge material advantage. (b) Rxf1; Rxf1+ Qg1 Rxg1+ and again a huge material adbvantage to Black (c) Qe4 when now ..Rxg1+; Kxg1 Rf1 is mate

Jan-17-13  LoveThatJoker: <deadlyduck> Exactly!

<31...R8f2!> 0-1

Very well done!

LTJ

Jan-17-13  Kikoman: <Qxf2!> and that's it. ^^
Jan-17-13  morfishine: <LTJ> Here you go, now I got black playing first...duh:

1...Rf1 2.cxd6 R8f2 3.Qe4 (to prevent 3...Bg2+ mate)...Rxg1+ 4.Kxg1 Rf1 mate

Thanks, I wish I got the full solution of the original puzzle :)

Jan-17-13  LoveThatJoker: <morfishine> You did great, man. Trust me, when I was first looking at it, I was tremendously impressed with (and moved by) the tactics involved.

Instructive!!

LTJ

Jan-17-13  James D Flynn: White is a pawn up. Both sides are fully developed but the Black pieces are more aggressively placed around the K-side. Both Ks have minimal pawn cover. The black Q is under attack from the R on f2, if it retreats to g7 adding another attacker to the N on d4 the N can go to e6 forking Q and R and forcing Bxe6 giving White a dangerous advanced passed pawn and opening the d5 square for the White Q. If Qe2 26.Bg4 forces the exchange of the Black B on h3 and brings the White Q into an aggressive position on the K-side. 25…..Qxf2(removes 2 defenders form the K-side and opens the way for the R ona8 to come into action at a modest sacrifice of material) 26.Bxf2 Rxf2 27.Ne6(to deny the R the square f8) Bxe6(not Rxh7+ 28.Kg1 Bxe6 29.dxe6 Rf8 30.Bf3 denies the f8 R access to the 7th rank) 27.dxe6 Rf8 28.Bh5(h4 simply wastes a move for after29.Rxh2+ Kg1 30.R8f2 the Black N can join the attack with Nf4 threatening mate in one on h3) R8f2 29.Bxg6 Rhg2+ 30.Kh1 Rxg6 31.Qh5 Rh2+ 32.Qxh2 Bxh2 33.e7 (if Re1 Be5wins)Re6 34.Kxh2 Rxe7 and Black is now a passed pawn up and has a won endgame.
Jan-17-13  James D Flynn: 27.Nf3 was an atrocious blunder after which a piece is lost and the f1 square loses a defender.
Jan-17-13  Patriot: White is up a pawn and threatens 26.Rxf7.

25...Qxf2 looks like a good candidate.

26.Bxf2 Rxf2

This threatens 27...Rxh2+ and 27...Bxd4 28.Qxd4 Rxe2.

27.Nf3 Raf8

I think white is fighting in this line although I'm not completely sure what will happen.

Jan-17-13  Patriot: I meant to say "I think black is fighting in this line..."

27.Nf3 seemed like a tough defense and apparently white thought so too.

Jan-17-13  James D Flynn: LoveThatJoker
In the position you gave after 30.c5 I don’t see any brilliant tactical shots but it seems to me that Rf1 wins rather simply: 30……Rf1 31.cxd6 R8f2(not Rxg1+ 32.Qxg1 Rf1 33.d7 and the pawn queens but now mate in one by Bg2 is threatened)32.Qxf2 Rxf2 and Black is 2 pieces up or 32.Rxf1Rxf1+ 33.Qg1 Rxg1+34.Kxg1 and again Black is 2 pieces up and the d pawns are stopped . if instead 31.c6 Rxg1+ 32.Qxg1 bxc6 33.dxc6 Rf1 34.Qxf1 Bxf1 35.c7 Ne7 wins. What am I missing?
Jan-17-13  LoveThatJoker: Good job, <James D Flynn>!

LTJ

Jan-18-13  TheBish: M Packalen vs L Schandorff, 1998

Black to play (25...?) "Medium"

Didn't get around to posting this earlier, so will just make minimal notes to bookmark for future access.

25...Qxf2! 26. Bxf2 Rxf2 leads to a crushing attack. Already threatening 27...Bxd4 28. Qxd4 Rxf2, as well as 27...Rxh2+ 28. Kg1 Rf8, with plans for 28...Rff2 and a mating attack.

If 27. Nf3 Nf4! threatens 28...Bg2+ 29. Kg2 Nh3# as well as 28...Rxe2. After 28. Bf1 Rxf1+ (winning the queen) or 28. Ng2 Bg2#, White is toast, so it's time to resign.

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