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Dieter Max Stern vs Jaroslav Hybl
6th Correspondence World Championship Final (1968), corr ICCF
Sicilian Defense: Richter-Rauzer. Neo-Modern Variation Nezhmetdinov Attack (B69)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-23-16  Abdunnaser: Black's bishop was useless. should've been exchanged with a knight.
Oct-23-16  mel gibson: < Abdunnaser: Black's bishop was useless. should've been exchanged with a knight.>

Are you blind?
That black bishop was attacking the knight & about to pin the 2 white rooks on f3.

Oct-23-16
Premium Chessgames Member
  agb2002: White has two knights and a pawn for the bishop pair.

Black threatens Bxf3 and Bc5, recovering the pawn.

I don't know. Otb, I would probably settle for 25.Rd3 and expect something like 25... Bc5 26.Rhd1 Bxd6 27.exd6 Rxd6 28.Ne5 with the idea of trading some material and pushing the queenside majority.

Another option is to crown this exchange sac weekend with 25.Rxd5 exd5 26.Rd1 getting two pawns for the exchange. For example, 26... Bc5 27.Rxd5 Bxd6 28.exd6 (28.Rxd6 Rxd6 29.exd6 Rd7 - +) 28... Rad7 (28... g6 29.Ne5 followed by d7 and the knight and the d-pawn cut Black's field in two) 29.Rxf5 Rxd6 30.b3 Rd1+ 31.Kb2 Rf1 32.Ng5 Rd2 33.Ne6 h6 34.Rf8+ Kh7 35.Rf7 with a complex game ahead.

That's all I can do today.

Oct-23-16
Premium Chessgames Member
  agb2002: I failed to see Nxf5 twice... <#%@!?> residual image...
Oct-23-16  clement41: Nice positional exchange sac today; similar to yesterday's puzzle but more long-term. White had to be careful tactically afterwards, e.g. after black's 26th if 27 N3d4?! then I guess 27...g6 challenging the defender 28 Nc6 intermediate gf 29 Nxa7 Bxa7 (if 28... Rc7 instead the win is slightly less clear I reckon after 29 Nfe7+ second zwichenzug Kf7)

The final position is a good training position (after, assuming, 41...Ke7) as it is one where white has to choose the most favourable endgame. 3 choices: 42 Nxc4, 42 Nxe8, and 42 Re1+. Importantly, in all lines white's king controls c2, the penetration square of black's rook.

I 42 Nxc4 dc 43 Re1+ K moves 44 RxR KxR 45 Kc2 etc. this looks winning for white, who will soon create a passer on the a-file

II 42 Nxe8 Kxe8 and black retains his active rook and passed d-pawn 43 a3 (or Rf5 maybe? but not Rf4 as after Rxf4 gf black gets a majority on the K-side) etc. and the win is much less clear

III 42 Re1+ Kd6 43 Rxe8 and black has a reasonably well-placed king on d6, retains his active rook, while white has an active rook too, ready to go to h8 or a8 for example

I would def go for the 42 Nxc4 line

Oct-23-16  RandomVisitor: A big question is whether black had a better move 27, for example, 27...Bxd4 or 27...g5.

After 26.Rxd5 exd5


click for larger view

Komodo-10.1-64bit:

<+0.77/39 26.Nxf5 Rf8 27.N5d4 g5> 28.Ne6 gxf4 29.Nxf8 fxg3 30.hxg3 Kxf8 31.c3 Rf7 32.Ng5 Rf5 33.Rh5 Kg8 34.Nxh7 Rxh5 35.Nf6+ Kf7 36.Nxh5 Ke6 37.g4 Be3 38.Kc2 Kxe5 39.Kd3 Bc1 40.b3 Bg5 41.Ng7 Be7 42.Nf5 Bc5 43.b4 Bb6 44.Ne7 Bc7 45.Ke3 Ke6 46.Nc6 Kf6 47.Nd4 Be5 48.a3 Bc7 49.Nf3 Bb6+ 50.Ke2 Bc7 51.Kd3 Bf4

+0.69/39 26.Rd1 g6 27.Rxd5 Rc7 28.Nd4 Ra8 29.c3 Rc5 30.Rxc5 Bxc5 31.Nc6 Bg1 32.Kc2 h5 33.Kd3 Kg7 34.Ke2 h4 35.gxh4 Rh8 36.Kf3 Rxh4 37.e6 Bc5 38.e7 Rxf4+ 39.Kxf4 Bxd6+ 40.Kg5 Kf7 41.e8N Kxe8 42.Kxg6 Kd7 43.Nd4 Bxh2 44.Kxf5 Kd6 45.Ke4 Kc5 46.Nf3 Bg3 47.Ne5 a5 48.b3 Kd6 49.Nd3 a4 50.b4 Kc6 51.Kd4 Bh4 52.Ne5+ Kd6 53.c4 Bf2+

Oct-23-16
Premium Chessgames Member
  PawnSac: < An Englishman: Was 28...g5 a little too helpful for White? >

I certainly think so, yes. Anytime you give a knight a passer duo you're lookin' for trouble. ..g6 would be more prophylactic and prudent.

Oct-23-16  Patriot: I went with the speculative sacrifice, 25.Rxd5 exd5 26.Nxf5 and considered 26...g6 27.Nd4.

I was pleased to see that I had the right idea but had to laugh about everything that happened after that...there is no way the players envisioned the whole thing! That's what makes it speculative.

Oct-23-16  schachfuchs: <there is no way the players envisioned the whole thing!> -> Correspondence World Championship Final
Oct-23-16  Patriot: That doesn't make it possible.
Oct-23-16
Premium Chessgames Member
  morfishine: Obvious exchange sac

Yawn

*****

Oct-23-16
Premium Chessgames Member
  patzer2: For today's Sunday puzzle, like <YouRang> and others, I easily found <25. Rxd5 exd5 26. Nxf5.> But, at least for me, finding Black's best replies and White's strongest follow-up was extremely difficult.

In the final position, I did manage to find the winning < 42 Nxc4 dc 43 Re1+ K moves 44 RxR KxR 45 Kc2 etc> pointed out by <Clement.> However, that's about all I found easy about White's follow-up in this well played 6th World Champion Correspondence Championship Final.

My thanks to <Random Visitor> for the 39-ply deep Komodo 10.1 analysis, suggesting the complexity of this problem might have been far beyond the superb play of at least one of these correspondence world champion finalists.

P.S.: Still visiting in Southern California this week. Had a great time Friday night cheering for my Grandson as he scored the winning touchdown in a 48 to 40 upset victory over his high school's biggest rival. Also enjoyed watching Penn State defeat Ohio State in a 24-21 upset, even though I'm not a particular fan of either of those great universities.

But I found the Ohio State loss was similar to the play in my Grandson's game in that both my Grandson's high school rival and Ohio State had several minutes to come back and win or tie late in the fourth quarter, but the defense rose up in both games and sacked the quarterback for big third and fourth down losses.

Applying that as a weak analogy to this game, I was wondering if Black didn't miss a chance to draw by not playing better late in the game with one of the stronger alternatives in <RV>'s deep Komodo 10.1 analysis.

Oct-23-16  et1: In the final position, white will be two pawns up after a couple of moves, right ?
Oct-23-16
Premium Chessgames Member
  YouRang: <An Englishman: Good Evening: Another intuitive and speculative sacrifice. Tough one to evaluate because there's no hope of foreseeing all possible defenses. Was 28...g5 a little too helpful for White?>

<AlicesKnight: Agree with <An Englishman> - why 28...g5 allowing 2 passed Ps? Perhaps a future White Pg4 was expected but the extra time needed gives Black more chance to blockade. Echoes of the Pearl of Zandvoort?>

<PawnSac: < An Englishman: Was 28...g5 a little too helpful for White? > I certainly think so, yes. Anytime you give a knight a passer duo you're lookin' for trouble. ..g6 would be more prophylactic and prudent.>

I would tend to agree as well. However, it seems that as bad as 28...g5 was, the alternatives are no better -- or worse!

Stockfish_16090917_x64_modern @ 34 ply:
+1.10 28...g5 29.f5 g4 30.Nc6 Rc7 31.Nfd4 Re8
+1.32 28...g6 29.e6 Rc8 30.a3 Rb7 31.f5 Kg7
+1.34 28...Rb7 29.a3 g6 30.Ne2 Rd8 31.Rd1 Kg7
+1.36 28...h6 29.c3
+1.39 28...Ra8 29.e6 Rc7 30.a3 g6 31.Re5 Kf8

Oct-23-16
Premium Chessgames Member
  YouRang: <et1: In the final position, white will be two pawns up after a couple of moves, right ?>

If black opts for 41...Ke7, yes. And worse, it simplifies to a trivial king and pawns endgame.

My engine actually prefers 41...Kg5, allowing 42.Nxe8 Rxb4, leaving white up a full knight, but at least black has a rook to defend with. Still should be a trivial win, but not *as* trivial.

Oct-23-16  Jack Kerouac: Reminiscent of Alekhine. Good intuition to negate the bishop combo that had a lot of open squares.
Oct-23-16  Abdunnaser: mel gibson:
Are you blind?
That black bishop was attacking the knight & about to pin the 2 white rooks on f3.

I mean sense move 27 and on

Oct-23-16  RandomVisitor: Letting the computer grind away, after 26.Rxd5 exd5.

Interesting after 26.Nxf5 Rf8 27.N5d4 are 27...g5 and 27...Bxd4


click for larger view

Komodo-10.1-64bit:

<+0.71/43 26.Nxf5 Rf8 27.N5d4 g5> 28.Ne6 gxf4 29.Nxf8 fxg3 30.hxg3 Kxf8 31.c3 Rg7 32.g4 Bc5 33.Kc2 Rxg4 34.Rxh7 Rg2+ 35.Kb1 Rg3 36.Nh4 Rg5 37.e6 Ke8 38.Rf7 Re5 39.Rf5 Rxe6 40.Rxd5 Bf2 41.Nf5 Re2 42.Rd6 Re5 43.Nd4 b4 44.Nc6 Re1+ 45.Kc2 bxc3 46.bxc3 Kf7 47.a4 Re2+ 48.Kb3 Re4 49.Nb4 a5 50.Nd5 Bc5 51.Ra6 Re5 52.c4

+0.67/43 26.Rd1 g6 27.Rxd5 Rc7 28.Nd4 Rdd7 29.Ne6 Rc6 30.c3 Re7 31.Ng5 Kf8 32.Nf3 Rc5 33.Rd2 Rd7 34.Kc2 Ke7 35.b4 Rc6 36.Rd1 Rd8 37.Ra1 Rd7 38.a4 Rdc7 39.c4 Rxc4+ 40.Nxc4 Rxc4+ 41.Kb3 Re4 42.axb5 axb5 43.Ra6 Re3+ 44.Kc2 Rxf3 45.Rxb6 Rf2+ 46.Kc3 Rxh2 47.Rxb5 Rg2 48.Kd4 Rxg3 49.Rb7+ Ke6 50.Rxh7 Rg4 51.Ke3 Rg3+ 52.Kf2 Rb3 53.Rb7 Kd5 54.Rb6 Ke4 55.e6 Rf3+

<+0.82/42 26.Nxf5 Rf8 27.N5d4 Re7> 28.Nc6 Rc7 29.Nb4 Ba5 30.Nd3 Bb6 31.Rd1 a5 32.a3 g6 33.Nde1 Rd8 34.c3 Kf7 35.Nc2 h6 36.Ncd4 Bxd4 37.Nxd4 Rb8 38.Nc2 Ke6 39.Ka2 Rc4 40.Nd4+ Ke7 41.Kb3 h5 42.Rd3 Kf7 43.Nf3 Rc5 44.Ng5+ Ke7 45.Rd4 Rb6 46.Rd1 Rb8 47.Nf3 Kf7 48.Nd4 Rc4 49.h4 Ke7

<+0.79/41 26.Nxf5 Rf8 27.N5d4 Bxd4> 28.Nxd4 b4 29.Rd1 a5 30.b3 Rc8 31.Kb2 Rac7 32.Re1 g6 33.Re2 Re8 34.g4 Kf7 35.Nb5 Rc6 36.f5 gxf5 37.gxf5 Rd8 38.Nd4 Rh6 39.a4 bxa3+ 40.Kxa3 Rh4 41.Ne6 Rc8 42.Rd2 Rh5 43.Nd4 Re8 44.Re2 Rb8 45.c3 Rh3 46.f6 Re8 47.Nb5 Rb8 48.Ka4 Rf3 49.Kxa5 Ra8+ 50.Kb6

Oct-23-16  RandomVisitor: In the first line posted above, black simplifies to a pawn-down ending that has drawing possibilities.
Oct-23-16
Premium Chessgames Member
  An Englishman: Good Evening: Thanks to <YouRang> and <RandomVisitor> for the fine analysis. Certainly did not expect to learn that 28...g5 was the best of a bad lot, while 27...g5 offered drawing chances!
Oct-23-16  et1: Thanks YouRang for your comment.
Oct-23-16
Premium Chessgames Member
  whiteshark: <♖sac: 25.Rxd5> It's actually a ♖/♗sac
Oct-23-16  leRevenant: <al wazir: I got the first move, but not the next 15.> ditto
Oct-23-16  dark.horse: Nice pawns and knights coordination.
Oct-23-16  RandomVisitor: A final look, after 26.Rxd5 exd5


click for larger view

Komodo-10.1-64bit:

+0.85/45 26.Nxf5 Rf8 27.N5d4 g5 28.Ne6 gxf4 29.Nxf8 fxg3 30.hxg3 Kxf8 31.c3 Rg7 32.g4 Bc5 33.Rh6 Rxg4 34.Rxh7 Ke8 35.e6 Be3 36.Rd7 Rf4 37.Ne5 Rf6 38.Rxd5 Rxe6 39.Nd3 Bb6 40.Kc2 Rh6 41.Kb3 Ke7 42.a4 bxa4+ 43.Kxa4 Rh4+ 44.Kb3 Ke6 45.c4 a5 46.Re5+ Kd7 47.Rg5 Bc7 48.Rg7+ Kc6 49.Rg6+ Kd7 50.Kc3 Rh3 51.c5 Rh4 52.c6+ Ke7 53.Nc5 Be5+ 54.Kd3 Kf7 55.Rg5 Bxb2

+0.62/45 26.Rd1 g6 27.Rxd5 Rc7 28.Nd4 Rdd7 29.Ne6 Rc6 30.c3 Re7 31.Ng5 Kf8 32.Nf3 Rc5 33.Rd3 Rd7 34.Kc2 Ke7 35.b4 Rc6 36.Kb2 Rdc7 37.Kb3 Ba7 38.Kc2 Bf2 39.Kd2 Rd7 40.a3 Bb6 41.Kc2 Bf2 42.Rd1 Rdc7 43.c4 bxc4 44.a4 Rd7 45.Kc3 Rd8 46.Ng5 Bb6 47.Rd5 Bc7 48.b5 axb5 49.axb5 Ba5+ 50.Kc2 Rc7 51.Rd1

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