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John Nunn vs Helmut Pfleger
Bundesliga (1989/90), FRG
Pirc Defense: Austrian Attack (B09)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jan-09-10  cyclon: <lost in space:> Okay, thanks! Modest looking (39.d4) -h6 seems pretty hard to spot.
Jan-09-10  patzer2: <lost in space> Fritz 10 also gives 39. d4!! h6! 40. dxe5 Qe6 41. b5 Qb3 42. Qg2 Rd3 43. Kh2 Bh4 44. bxa6 Bg3+ 45. Kg1 Qc3 = (0.00) as best.

I have yet to explore all the sidelines for a possible improvement, but 39. h6! in this line appears to be an amazing defensive resource that cooks today's puzzle offering.

However, for a move to give White his best winning chances, I still say 39. d4!! is one of the most instructive I've seen in all my years of puzzle solving. The possibility of 39...h6! with a draw for Black IMO makes it all the more fascinating and instructive.

Jan-09-10  cyclon: <lost in space:39. d4 h6! 40. dxe5 Qe6 41. b5 Qb3 42. Qg2 Rd3 43. Kh2 Bh4 44. bxa6 Bg3* 45. Kg1 Qc3 46. Bb6 Bxe5; = > By the way - just for curiosity - how Black proceeds after 47.a7?
Jan-09-10  zb2cr: <chessgames.com: ....

Those who saw all the way to 42.Rg5! should be very proud, for that's the move that really keeps the heat on.>

Then, I should be very proud, because I did. It's rare for my board vision to hold up for 4 full moves, but this time it did. Took me somewhere about 7 minutes.

Jan-09-10  ealvarez: First time I have the right answer : ))

I haven't conduct a deep analysis but, after 40.exd4, I like the idea of 40....Rd5, attacking the black Queen and removing the coordination with the Rook.

Jan-09-10
Premium Chessgames Member
  johnlspouge: < <cyclon> wrote: <OhioChessFan:Fritz found 39. h4 as a second choice.> Interesting. Such a quiet move. >

Toga actually evaluated several moves for both sides within about +0.5 P (with a best play evaluation of +1.0 P, so today's puzzle (while very interesting positionally) seems not to hold any great tactical stroke.

< <patzer2> wrote: <lost in space> Fritz 10 also gives 39. d4!! h6! 40. dxe5 Qe6 41. b5 Qb3 42. Qg2 Rd3 43. Kh2 Bh4 44. bxa6 Bg3+ 45. Kg1 Qc3 = (0.00) as best. >

Interestingly, Toga disagrees with Fritz and evaluates the sequence of moves at about +1.0 P.

Jan-09-10  lost in space: <<cyclon>: <lost in space:39. d4 h6! 40. dxe5 Qe6 41. b5 Qb3 42. Qg2 Rd3 43. Kh2 Bh4 44. bxa6 Bg3* 45. Kg1 Qc3 46. Bb6 Bxe5; = > By the way - just for curiosity - how Black proceeds after 47.a7?>

47. a7?! Rd1+ 48. Rf1
(48. Kf2?? Qe1+ 49. Kf3 Rd3+ 50. Be3 Rxe3#)
(48. Qf1?? Qg3+ 49. Kh1 Qh2#)

48...Rxf1 49. Kxf1
(49. Qxf1 Qg3+ 50. Qg2 Qe1+ 51. Qf1 Qg3; perp; 1/2 : 1/2)

49...Qa1+ 50. Ke2 Qa2 51. Kf3 Qd5+ 52. Kf2 Qd2+ 53. Kg1 Qe1+; perp; 1/2 : 1/2

Jan-09-10  lost in space: <<johnlspouge>:Interestingly, Toga disagrees with Fritz and evaluates the sequence of moves at about +1.0>

The same with Rybka 3 (which I needed as support for this puzzle). The advantage get smaller and smaller move after move when sliding forward. I was not able to find any line which is winning after 39...h6

Jan-09-10  wals: John Nunn - Helmut Pfleger, BRD 48/198 1989

Analysis by Rybka 3 1-cpu: depth 16 time 4min 20

1. (0.95): 39.Qe4-c4 Qd7-e6 40.Bc5-b6 Rd8-a8 41.Qc4xe6 f7xe6 42.Rf5-h5 Kh8-g7 43.Kh1-g2 Ra8-c8 44.Kg2-f3 Rc8-c3 45.Bb6-e3 Rc3xd3 46.b4-b5 a6xb5 47.a5-a6 Kg7-g6

2. (0.83): 39.d3-d4 Qd7-e6 40.d4xe5 Bf6-g7 41.Bc5-b6 Rd8-d1+ 42.Kh1-g2 h7-h6 43.Qe4-a8+ Kh8-h7 44.Qa8-f3 Rd1-d2+ 45.Bb6-f2 Bg7xe5 46.Qf3-e4 Be5-g7 47.Rf5-e5+ Qe6-g6 48.Re5xe7 Qg6xe4+ 49.Re7xe4 Rd2-b2 50.Kg2-f3 Rb2-b3+ 51.Bf2-e3

Jan-09-10
Premium Chessgames Member
  Jimfromprovidence: <TheaN> <For as much as I'm willing to understand by just looking at this position, Black is in major trouble.>


click for larger view

In the light of day, I agree that after the text 48 Kf2, black's chances don't look so good.

Exchanging rooks (starting with 45 Rxd8+) instead of queens still looks like the better way to go, though.

Jan-09-10  cyclon: <lost in space:> Ok. Thanks for answering. Though (because) I don`t use programs in solving these puzzles, it`s also good to see some direction-giving lines AFTERWARDS by several commentators who might use them in varying ways. I know, that pc-programs are STRONG these days and so be it.
Jan-09-10
Premium Chessgames Member
  OhioChessFan: Fritz 10, 24 plies after 40. Bb6

(.80) 39. d4 h6 40. Bb6 Rc8 41. dxe5 Qe6 42. Bf2 Rc4 43. Qd3 Bg7 44. Bc5 Rc1+ 45. Kg2 Ra1 46. Rf1 Rxf1 47. Kxf1 Bxe5 48. Qe4

With Fritz going for dxe5 just one move later, I don't see any progress being made. Playing ahead to White's 48th, the evals are dropping quickly. I suspect 39...h6 would hold with perfect play.

Jan-09-10
Premium Chessgames Member
  OhioChessFan: <However, for a move to give White his best winning chances, I still say 39. d4!! is one of the most instructive I've seen in all my years of puzzle solving. The possibility of 39...h6! with a draw for Black IMO makes it all the more fascinating and instructive.>

Black missed 38...h6 which I think was much better than 38...Rd8. I guess it's not surprising 39...h6 holds up well.

Jan-09-10
Premium Chessgames Member
  OBIT: As usual for this Web site, the flawed puzzles turn out to be the most interesting. :) So, the final verdict is this position is drawn with best play (39...h6!)?
Jan-09-10
Premium Chessgames Member
  OhioChessFan: <Obit> IMHO it's drawn after 39. d4 h6, but I am beginning to think 39. Qc4 is better.
Jan-09-10  butilikefur: first tried 39. Bxe7 Qxe7 (39...Bxe7 40. Rxf7 Qd5 41. Rxh7+ Kg8 42. Rxe7 wins ..e.g. 42...Qxe4 43. dxe4 Rd4 44. Rxd5 Rxb4 45. Kg2) 40. Rh5 Kg8 (40...h6 41. Rxh6+ Kg8 42. Rh5 Rd4 43. Qh7+ Kf8 44. Rg5 Qb7+ 45. Kg1 Ke7 and Black wins here too) 41. Qxh7+ Kf8 42. Rf5 (42. g5 Bg7 and Black is safe) 42...Bg7 43. g5 Rxd3 44. g6 f6 and White has nothing

<39. d4 exd4> 39...Qd5 40. Qxd5 Rxd5 41. dxe5 Rxe5 (41...Bxe5 42. Rxe5) 42. Rxe5 Bxe5 43. Bxe7 and 44. Bc5 and b5 win

<40. Rh5 h6> 40...Kg8 41. Qxh7+ Kf8 42. Rg5 wins

<41. Rxh6+ Kg8 42. Qh7+ Kf8 43. Rf6 Qd5+ 44. Kg1 Ke8 45. Rf5 Qe6 46. Qh8+ Kd7 47. Qxd4+ Kc8 48. Qc3> and White wins.

Jan-09-10  David2009: Saturday's puzzle Nunn vs H Pfleger, 1989 White 39?

Way past my bedtime so only time for a very quick scan. 39 Rh5 leads to a drawish ending after Qd5 or even Qxd3. So instead 39 Bxe7 hoping for 39...Bxe7 40 Rxf7 Qxd3 41 Rxh7+ Kg1 42 Qxd3 Rxd3 42 Rxe7 with a better ending (pawn up). Or alternatively 39...Qxe7 40 Rh5 and Black is in a mating net. Time to check, then go to bed:
=====
Completely wrong. I will look tomorrow (Sunday) to see if/how Crafty busts me defending as Black. Happy solving/ happy weekend/ good night all.

Jan-09-10  butilikefur: Hey <david2009> after 39. Bxe7 Bxe7 40. Rxf7 Qxd3 41. Qxe5+ Black is mated.
Jan-09-10
Premium Chessgames Member
  OhioChessFan: Evals are continuing to rise as I slide forward with 39. Qc4. Fritz goes for 39. Qc4 Qe6 40. Qxe6 which surprises me.
Jan-10-10  5hrsolver: I saw the combination as in the game but failed to evaluate that the ending is winning for white. I kept looking for a haymaker which was not there.
Jan-10-10  David2009: Thanks <butilikefur>: <Hey <david2009> after 39. Bxe7 Bxe7 40. Rxf7 Qxd3 41. Qxe5+ Black is mated>. You are absolutely right but 39...Qxe7! instead of 39...Bxe7?? busts my combination and wins for Black, since after 40.Rh5 Kg8 41.Qxh7+ Kf8 the Bf6 prevents the intended 42. Qh8 mate. So my whole combination is unsound.
Jan-10-10  David2009: Nunn's endgame play is most resourceful but according to Crafty Black missed several drawing chances.

Starting from the puzzle position, after 39 d4! as played by Nunn Crafty defending follows the game line 39 ... exd4 40.Rh5 Kg8 41.Qxh7+ Kf8 42.Rg5 Qc6+ 43.Kg1 Ke8 44.Rg8+ Kd7 45.Qf5+ Qe6 46.Qxe6+ fxe6 47.Rxd8+ Kxd8 48.Kf2 e5 49.Kf3 Kc7 50.b5 axb5 to reach (Nunn v Pfleger 1989 51?)


click for larger view

but now replies to 51 Ke4 with 51...e6! and White cannot break through.

Even after the game continuation 51 ...Kc6 51.Ke4 Kc6 52.Bb4 Bg5 Black can still draw. We reach (Nunn v Pfleger 1989 53?)


click for larger view

White played 53.Be1 and the game ended 53...Kc5? 54.h4 Bf4 55.g5 b4 56.Bxb4+ Kxb4 57.a6 1-0. Instead Black can still draw with 53...Bc1 e.g. 54.h4 Ba3 55.g5 b4 56.Bxb4 Bxb4 57.g6 d3 = .


click for larger view

White to play has nothing better than 58.Kxd3 e4+ 59.Kxe4 allowing ...Bc3 and draws.

Crafty link to the position at move 53 (White to play):: http://www.chessvideos.tv/endgame-t...

Crafty link to the puzzle position: http://www.chessvideos.tv/endgame-t...

Jan-10-10
Premium Chessgames Member
  Pawn and Two: As has been noted by many, this puzzle position appears to be a draw.

Fritz 12 confirms the suggested drawing line leads to an equal position: 39.d4 h6! 40.dxe5 Qe6 41.b5 Qb3 42.Qg2 Rd3 45.Kh2 Bh4 44.bxa6 Bg3 45.Kg1 Qc3 46.Bb6 Bxe5, with the likely continuations, 47.a7 Rd1+, or 47.Qe2 Qc1+.

<OhioChessFan> Your Fritz 10 analysis showed: (.80) (24 ply) 39.d4 h6! 40.Bb6 Rc8 41.dxe5 Qe6. At this point Fritz 12 preferred: (1.02) (22 ply) 42.Bc5 Kg8 43.Qd4 Bg7 44.Kg1 Rf8 45.Kf2 Re8 46.Kf3 Rc8, (1.02) (20 ply) 47.Kg3 Rb8 48.Kg2. While 40.Bb6 may be an improvement over 40.dxe5, Fritz was unable improve White's position, and a draw in this line seems likely.

Another suggested improvement is 39.Qc4. After 39.Qc4, Fritz indicates: (.99) (26 ply) 39...Ra8 40.Kh2 Kg8 41.Be3 Rd8 42.Qxa6 e4 43.dxe4 Qc7+ 44.e5 Bxe5+ 45.Kg2 Qc2+, (.96) (22 ply) 46.Rf2 Qe4+ 47.Rf3 Qxb4 48.Qb6, (.92) (24 ply) 48...Rd2+ (better than 48...Qxb6) 49.Bxd2 Qxd2 50.Qf2 Qxa5 51.Rxf7 Bf6 52.Rxf6 exf6 53.Qxf6 Qd2+.

This position is probably a draw. In "Basic Chess Endings", Fine states that in queen and pawn endings, with all the pawns on one wing, advantages of two vs one pawn, or three vs two pawns are practically hopeless draws.

<David2009> You have provided some interesting analysis for this ending. You indicate that Black could have drawn with 51...e6.

Fritz indicates that 51...e6 is a very good try, but White will be able to win by: (1.51) (25 ply) 51...e6 52.Bb4 Bg5 53.Be1, (2.46) (27 ply) 53...Be7 54.Kxe5 Bc5 55.a6 b4 56.Bxb4 Bxb4 57.a7 Kb7 58.Kxd4, or 53...Bf6 54.h4 Be7 55.Kxe5 Bc5 56.a6 b4 57.Bxb4 Bxb4 58.Kxd4.

You also indicated a draw for Black with 53...Bc1. Fritz indicates a win for White after 53...Bc1: (5.47) (24 ply) 54.h4 Ba3 55.g5 e6, (10.82) (22 ply) 56.g6 Bf8 57.h5 d3 58.a6 b4 59.Bxb4 Bxb4 60.a7 Kb7 61.g7.

If 53...Bc1 54.h4 Ba3 55.g5 b4 56.Bxb4 Bxb4 57.g6 d3 58.Ke3 e4 59.g7 wins. White also wins after 53...Bc1 54. h4 Ba3 55.g5 b4 56.Bxb4 Bxb4 57.g6 d3 58.Kxd3 e4+ 59.Kxe4 Bc3 60.Kf5. Black will be unable to prevent the promotion of all the White pawns.

Jan-11-10  LIFE Master AJ: <David2009> "but now replies to 51 Ke4 with 51...e6! and White cannot break through."

I found a win, I checked it with Fritz 11 ...

Jan-17-10  VargPOD: Been away, doing these afterwards.
Saturday.

Tried 39.Bxf7, but did not get anywhere. 39.d4 Qd5 did not look promising, should have calculated all the way.

Total 3/6.

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