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| Jan-09-10 | | goodevans: Missed it. But at least I'm in good company in not finding 39 d4. I think what makes <39 d4> so hard to find is that it still allows 39 ... Qd5, only now 39 ... Qd5 isn't good enough (see <OBIT: Just a few notes on the try 39...Qd5>). On the other hand after 39 ... exd4 black no longer has the Qd5 resource at his disposal. |
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| Jan-09-10 | | ILikeFruits: nunn is...
so cool... |
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| Jan-09-10 | | Skylark: My attempt was 39. Rxe5 as 39. Rh5 doesn't work as pointed out; I thought the exchange sac would be strong enough after 39. Rxe5 Bxe5 40. Qxe5+ and then 40. .. f6 41. Qxe7 Qxe7 42. Bxe7 Rxd3 43. Bxf6+ and 44. Kg2 looks strong for white (I would play white in this position and try to win) or 40. .. Kg8 41. Bxe7 Re1 42. Qg5+ Kh8 43. Bf6# which is nice and all, but 40. .. Kg8 41. Bxe7 Qd5+ is the obvious move that I completely overlooked in my head, whereupon 42. Qxd5 Rxd5 leaves white struggling to draw with only a pawn for the exchange and unfavourable endgame circumstances. Maybe 39. Rxe5 Bxe5 40. Qxe5+ Kg8 41. Qg5+ leads somewhere? eg 41. .. Kh8 42. Bxe7 or 41. .. Kf8 42. Qh6+ Ke8 43. Qxh7 or 42. .. Kg8 I guess you can at least take perpetual with 43. Qg5+, or maybe play 43. d4 but I don't think white has large hopes in this position. Well this was my train of thought when looking for the solution, but either way I was pretty sure I was missing something concrete (puzzles are rarely as vague as my line of analysis). In the end I should have tried to follow up a way of making the Rh5 idea work.. Somewhat like Petrosian, however, (or so I like to think) I am in love with the idea of an exchange sacrifice and have had quite a few nice victories with a pawn or two pawns for the exchange, so I guess I let this vice of mine take hold of me and chased illusions. Ah well. |
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Jan-09-10
 | | alexrawlings: Very enjoyable game to play through. I didn't see 39 d4 but did see that Black would probably play 39.. Qd5 in the event of 39 Rh5 |
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| Jan-09-10 | | cyclon: Okay, patience. 39.D4 exd4 ( -Qc7 40.dxe5, or -Bg7 40.Rxf7 Qd5 [ -Re8 41.dxe5 edge] 41.Qxd5 Rxd5 42.Rxe7 Kg8 43.dxe5 both edge for White) 40.RH5 (g5 gets the answer D3 - the POINT with a move 39.d4 is that BQ can`t get to d5) -Kg8 41.Qxh7+ (with g5 may come Bg7, or even maybe better -Qd5 42.Qxd5 Rxd5 43.gxf6 Rxh5 44.fxe7 Re5 45.b5 D3 46.Bb4 RxE7 BLACK wins) -Kg8 42.Rg5 ("forced") -Qc6+ 43.Kg1 Ke8 44.Rg8+ Kd7 45.Rxd8+ (by Qf5+ Qe6 White gets nothing) -Kxd8 AND NOW (if you`re still with me) 46.G5 (most difficult move to find for me); 1. (46.) -Be5 ( -Bxg5+ 47.Qg8+ wins) 47.Qxf7 followed by g6, Whites clear edge. 2. (46.G5) -Qf3 48.QG8+ (to prevent check from g3 - for gxf6 immediately gets -Qg3+ and Black MIGHT get perpetual)) -Kd7 (by -Kc7 there might become WQ-check later on diagonal h2-b8 exchanging Queens and winning the endgame.) 49.gxf6 (threats Qq4+) -Qe3  Qd1 50.Kg2 (somehow this rather than Kh2 - maybe because of Kings mobility) and White Queen INTERFERES stopping most likely BQ-checks (THOUGH I`M NOT COMPLETELY SURE OF THIS - it should be analyzed, but most likely White wins) and in that case there is mainly a technical win to proof for White. Anyway, this analysis is too long to be fully correct (it might be even faulty idea), but it`s the best I can come up today. Nunn is Nunn and I think he might have come up with a deeper idea. |
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| Jan-09-10 | | tacticalmonster: 1) black king miss the protection of g pawn. This weakens the e4-h7 diagonal and the f6-h8 diagonal which is covered by the bishop
2) white king is exposed and the a8-h1 diagonal is weak 3) white is up a pawn and he has a queenside majority 4) black piles up on the d-file and the d3 pawn is under fire 5) black double e pawns restrict the black bishop
6) white queen and bishop are ideally placed. The rook and pawns, however, can use some improvement. candidate: Rh5, Bxe7 and d4
1 Rh5 Qxd3! 2 Rxh7+ Kg8 3 QxQ RxQ 4 Rh5 - Black is down a pawn, but the black rook is very active and the White rook is stuck in no man land. black is at least equal 1 Bxe7 work like a charm with Bxe7 2 Rxf7 Qxd3 3 Rxh7+ Kg8 4 QxQ RxQ 5 Rxe7 winning but fail to Qxe7 2 Rh5 Kg8 3 Qxh7+ Kf8 ( 4 Rg5?? Qb7+ and Bxg5) 1 d4 Qd5 2 QxQ RxQ 3 dxe5 Bg7 ( 3 Bxe5 4 Rxe5!) ( 3 Rxe5 4 Rxe5 Bxe5 5 b5!) 4 Rxf7 Rxe5 5 Rxe7- white is two pawns up and winning 1 d4 exd4 2 Rh5 Kg8 3 Qxh7+ Kf8 4 Rg5 Qc6+ 5 Kg8 Ke8- < here i am stuck because I thought black king is escaping on the queenside. I thought black has a lot of counterplay because of the exposed white king. I simply fail to see the strength of Qf5+ going into winning ending. The source of my mistake is probaby too fixated on mating the king and therefore failing to see other avenues to win the game > time spent: 1 hour |
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| Jan-09-10 | | remolino: Saturday. White to play. 39? Difficult.
Material is even. White would like to play 39. Rh5 but it does not work immediately on account of either 39...Qxd3 or 39...Qxd5 Therefore:
39.d4!
A. 39...exd4 40.Rh5
B. 39...Qd5 40.Rxd5 Rxd5 41. dxe5 and White will win a pawn since the e7 pawn is loose Time to check |
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| Jan-09-10 | | cyclon: <lost in space: 9. d4 h6! 40. dxe5 > I`d play 40.Bb6 (INSTEAD of -dxe5) and if -Rc8 41.dxe5 Qd1 Rc1+ gets 42.Bg1. In case of (40.Bb6) -Qd5 41.Qxd5 Rxd5 43.dxe5 Rxe5 ( -Bxe5 44.Rxe5 wins) 44.Rxe5 Bxe5 45.b5 wins. Perhaps you can improve. |
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| Jan-09-10 | | cyclon: <OhioChessFan:Fritz found 39. h4 as a second choice.> Interesting. Such a quiet move. |
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| Jan-09-10 | | cyclon: So, in the actual game White played a line that I didn`t consider convicting enough for him. SUPPOSING Blacks defence is correct, I must have mis-assessed the position and over-estimate Blacks chances after 45.Qf5+ Qe6 46.Qxe6+ fxe6. |
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| Jan-09-10 | | johnlspouge: Saturday (Very Difficult)
Nunn vs H Pfleger, 1989 (39.?) White to play and win.
Material: Even. The Black Kh8 has 2 legal moves. The White Qe4 x-rays Ph7 through Rf5, suggesting the clearance and double attack 39.Rh5. As a defensive resource, Black can pin Qe4 to Kh1 with 39…Qd5. The White Bc5 requires activation; by way of compensation, the Black Bf6 is blocked by the Black Pe5 and cannot defend the weak light squares around Kh8. The White Kh1 is secured from check. Candidates (39.): Rh5
[39.Rh5 Qd5 40.Rxh7+ Kg8 appears less than decisive]
The resource 39…Qd5 blunts the threat 39.Rh5, so the Black Qd7 has a burden. White should therefore overload Qd7. <[I could not see anything more than the following interesting try:]39.Bxe7 (activating Bc5, and threatening 40.Bxf6+)
(1) 39...Bxe7 [Qxe7 40.Rh5 threatening 41.Qxh7#is now fatal] 40.Rxf7 (threatening 41.Qxh7#)
40…Qd5 41.Rxh7+ Kg8 42.Rxe7 (threatening 43.Qh7+ and mate soon) Black is now 3P down, and his Qd5 can do nothing but neutralize mate threats from the White Qe4. [The move 39.Bxe7 is countered effectively by the following, however.] (2) 39...Qxe7 40.Rh5 (threatening 41.Qxh7#)
40…Kg8
and <Black> is winning.]> |
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| Jan-09-10 | | WhiteRook48: had no clue what to do |
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| Jan-09-10 | | patzer2: For today's Saturday puzzle solution, Nunn's 39. d4!! initiates a deep passed pawn combination and provides IMO one of the most instructive positions we've ever been asked to analyze in the entire history of chessgames.com. In the puzzle position (39?), Nunn has several positional pluses: including a space advantage; better pawn structure; more advanced pawns; a potential attack on Black's weakly protected King and pawn majorities on both wings which are potentially stronger than Black's much weaker and less advanced central pawns. However, the problem is in finding a way to overcome Black's defenses and convert these advantages to a winning initiative. Nunn would like to play Rh5 and attack the King and at least win the pawn on h2. However if he tries 39. Rh5? immediately, Black equalizes easily after 39...Qxd3 40. Rxh7 Kxg8 41. Qxd3 Rxd3 =. In analyzing the puzzle position, I had seen this and had considered the possibility 39. d4!! However, the counter 39. d4!! Qd5 with a simplifying pin to stop the attack restrained me. Also the concern over giving Black a potential central passer and disobeying the old maxim of blocking and keeping "passed pawns" under "lock and key" held me back. What I missed in this superficial look was that after 39. d4! Qd5 40. Qxd5 Rxd5 White has an immediate winning passed pawn combination with 41. b5!, when play might continue 40...axb5 42. a6 Kg8 43. a7 Rd8 44. dxe5 Bg7 45. e6 fxe6 46. Bb6 Ra8 47. Rxb5 Kf7 48. Be3 Kg6 49. Rb8  . In the game continuation, as <Jimfromprovidence> suggests, Nunn would have arrived at a winning position quicker by playing 45. Rxd8+! instead of 45. Qf5+!? However, I won't go so far as Jim in calling 45. Qf5+!? a mistake as I'm not so sure that with strong play that it doesn't win anyway. Still Nunn had the right idea in forcing the Rooks off the board, holding Black's central passers with his King and Bishop and applying pressure with his outside passers on both wings. One winning possibility with 45. Rxd8+!, as analyzed with Fritz 10, is 45. Rxd8+! Kxd8 46. g5 Be5 (46... Qf3 47. Qg8+ Kc7 48. gxf6 ) 47. Qxf7 Qd7 48. b5 Qxb5 49. Qxe7+ Kc8 50. Qxe5 . |
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| Jan-09-10 | | lost in space: <<cyclon>: <lost in space: 9. d4 h6! 40. dxe5 > I`d play 40.Bb6 (INSTEAD of -dxe5> Hmm,
after
39. d4 h6! 40. Bb6 (as prosed by cyclon) 40...exd4 41. Bxd8 Qxd8 42. Qb7 Qd6 43. Kg2 (43. b5 d3 44. Qf3 axb5 45. Rxb5 =) 43...d3 44. Qd5 Qxb4 45. Qxd3 Kg7; nearly = 
click for larger view |
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| Jan-09-10 | | lost in space: <<OhioChessFan:> <lis> I did a quick run through with Fritz and he thinks those are all best. To my surprise, sliding ahead, I quickly reached the dreaded 0.00.> Hi <Ohio>, I have this a best: 39. d4 h6! 40. dxe5 Qe6 41. b5 Qb3 42. Qg2 Rd3 43. Kh2 Bh4 44. bxa6 Bg3* 45. Kg1 Qc3 46. Bb6 Bxe5; =
click for larger view |
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| Jan-09-10 | | cyclon: <lost in space:> Okay, thanks! Modest looking (39.d4) -h6 seems pretty hard to spot. |
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| 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. |
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| 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? |
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| 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. |
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| 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. |
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| Jan-09-10 | | 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. |
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| 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 |
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| 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 |
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| 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 |
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Jan-09-10
 | | 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 viewIn 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. |
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Kibitzing
sac: 56.Bxb4+