< Earlier Kibitzing · PAGE 3 OF 3 ·
|Sep-03-09|| ||doubledrooks: I first looked at 37. Ne6+ but realized that wasn't convincing. So I went with the forcing move 37. Rxf7+. After that, my analysis is basically the same as <agb2002>'s.|
|Sep-03-09|| ||Jimfromprovidence: I went with the 37. Bxb5, Rxb5 38.Ne6+ fxe6 39 fxe6 line as well and I think it works.
click for larger view
Here, we have sacrificed a knight in order to get two connected passed pawns.
One of a few ways to win material is after the line 39
Nc6+ 40 Ke3 Re5 41 Rxc7 Rxe6 42 Rc8+ Re8 43 Rxc6 Kf7 44 Rxd6.
click for larger view
Not as good as the text, but it wins a couple of pawns.
|Sep-03-09|| ||kevin86: I missed this ingenius method of exchanging pieces and simplifying to a won pawn ending.|
|Sep-03-09|| ||mollyboo: I saw this within a few seconds - but have struggled with some 'simpler' puzzles this week. It never ceases to amaze me how different people's brains assess the same position.|
|Sep-03-09|| ||Athamas: <Mollyboo: I saw this within a few seconds - but have struggled with some 'simpler' puzzles this week. It never ceases to amaze me how different people's brains assess the same position.>|
That was certainly true of me, I saw this one in about 10 seconds, but I spent about 15-20 minutes on the Wednesday puzzle.
|Sep-03-09|| ||muralman: I am like mollyboo. Monday went by without a solution. Tuesday was better, with some careful thought. Wednesday was luck plus logic, and today, well, I didn't get the final move. I was piece hunting. I think that was the intention anyway looking at possible outcomes.|
|Sep-03-09|| ||YouRang: I didn't see the game solution at all. However, I think I did okay anyway:|
Seeing my rook battery on the g-file and the central pile of pawns, I figured the main threats to look for were: [A] back-rank mate , [B] win a rook, or [C] promote a pawn.
I started out considering <37.Ne6+>, but then <37...fxe6 38.fxe6 Bxe6> -- Here, my pawns have trapped the black king on the 8th rank, but black's king is protected on both sides by rooks, and I saw no way to proceed (plus I'm down a bishop).
So, I tried exchanging bishops first: <37.Bxb5 Rxb5> this has two nice effects: (1) I don't lose a bishop, and (2) I've removed the king's defense on the queenside.
Now I try Ne6 again: <38.Ne6 fxe6 39.fxe6> and I threaten to win with 40.e7+ Ke8 41.Rg8+ Rxg8 42.Rxh8 (note that if black's rook were still on b8, then 41.Rg8+ could be answered by 41...Kf8, since the rooks guard each other).
Black can try to fix this by putting the rook back on the 8th rank: <39...Rb8>. However, now I have time to move my rook battery to the c-file! <40.Rxc7!> threatening 41.Rgc3 and 42.Rc8+ with mate to follow.
Checking my work with a computer:
I see that black could have defended a little better. Mainly, 39...Nc6+ is stronger than 39...Rb8. But still, white should be winning anyway: 40.Ke3 Re5 41.Rxc7 Rxe6 42.Rc8+ Rd8 43.Rxc6 Kf7 44.Rxd6 Re6 45.Rxe6 Kxe6 46.Rg5 Kxf6 47.Rxa5 and the 2 passed pawns should win.
|Sep-03-09|| ||lost in space: <<<David2009>:<lost in space:> Ater 37...Kxf7 the right move is Rg7+ and not Bh5+ due to Ng6>. But if you can't be good, be lucky - Black did play Nxf7 after all and so my line won and my blunder was never made>|
Be sure, I am lucky, maybe beside the fact hat I just got the information that I lost my driving licence for 1 month due to being too fast.....
|Sep-03-09|| ||MiCrooks: I had Ne6+ as well, but I was planning on playing Bxb5 after fxe6 instead of recapturing immediately. Okay, but not as good as the game continuation. If Black plays Rxb5 immediately then fxe6 is quite good for White who then has way more than enough compenstion for the piece.|
However, Black has a couple of other options that lead to a fairly level game. c5+ Kc3 and now again taking the Bishop is bad for Black. But after exf5 the game is level. Black could also play exf5 right away, but after Rxc7 White has the better game.
So Ne6+ doesn't lose, and in a game situation Black may well take the Bishop where he would be losing, but Rxf7+ is clean and forcing. Ah well...win some lose some.
|Sep-03-09|| ||CHESSTTCAMPS: Material is even, but the position is dynamic. Black has a passed c-pawn, but white's advanced f-pawns and doubled rooks are pushing the black king against the wall. With black's Rh8 having no mobility and the Kf8 having one legal move, it is appropriate to look for a finishing combination. Yet black's other pieces are mobile and the Ne5 seems to hold the defense together. White has forcing candidates that come up short:|
My first instinct, the idea being to unfurl the doubled white pawns. "Connected passed pawns on the 6th rank>=rook" was the rule of thumb in certain endgames. But white is sacrificing two minor pieces and it comes up short: 37... fxe6 38.fxe6 (Bh5 exf5 gives white nothing concrete for the piece) Bxe2 39.e7+ Ke8 40.Rxh7 (Rg8+ Kf7 looks fine for black) Rxh7 41.Rg8+ Kd7 42.Rxb8 Bh5 43.Rd8+ Ke6 is winning for black.
Wins against c6? 38.a4, but 38... Nc6+ holds
The idea is to support 38.Ne6+ fxe6 39.fxe6 threatening e7#, but 37...Bc4 seems to hold. Then I noticed something stronger.
Intuition told me that this wasn't possible, which shows that sometimes intuition should be locked up where it can't do any harm.
A) 37... Kxf7? 38.Rg7+! (Bh5+? Ng6 leaves black alive) Ke8 39.Re7+ Kd8 40.Ne6+ Kc8 41.Rxc7#
A.1) 38... Kf6 39.Nh5#
A.2) 38... Kf8 39.Ne6+ Ke8 40.Re7#
A.3) 39... Kf8 40.Ne6#
B) 37... Nxf7 38.Ne6+ Ke8 39.Bxb5+ Rxb5 (c6 40.Bc6#) 40.Nxc7+ Kd7 41.Nxb5 and black is lost in view of white's two extra pawns and threats of Kd5 and Rg7.
Final answer - let's see...
|Sep-03-09|| ||wals: [Event "Vienna"]
[White "Stanislav Savchenko"]
[Black "Alexey Ivanov"]
[Annotator "Rybka 3 1-cpu (30m)"]
A52: ♗udapest Gambit
1. d4 Nf6 2. c4 e5 3. dxe5 Ng4 4. e4 Nxe5 5. f4 Nec6 6.
Nf3 Bc5 7. Nc3 a5 8. Bd3 d6 9. Qe2 Bg4 10. Be3 Nd4 11. Qf2 Nxf3+ 12. gxf3 Bxe3
13. Qxe3 Qh4+ 14. Kd2 Be6 15. f5 Bd7 16. Nd5 Kd8 17. Rag1 Bc6 18. Rg4 Qh5 19.
Nf4 Qh6 20. Rhg1 Qf6 21. Rxg7 Qxb2+ 22. Bc2 Nd7 23. Qc3 Qxc3+ 24. Kxc3 Ke7 25.
h4 (25. Bd3 Nf6 ) 25... Ne5 (25... Nf6 26. Bb3 ) 26. R1g3 (26. Bd1 Kf8
) 26... Kf8 (26... Rab8 27. Bb3) 27. Nh5 (27. Bd1 a4 ) 27... Ng6 (
27... Nd7 28. a3 ) 28. f4 (28. a3 a4 ) 28... Re8 (28... Rd8 29. a3 (
29. fxg6 hxg6 30. e5 dxe5 31. fxe5 Rxh5 32. Rxf7+ Kxf7 33. Bxg6+ Ke6 34.
Bxh5 Kxe5 )) 29. Kd4 b6 30. f6 (30. a3 ) 30... Bb7 (30... Ra8 31. f5
Ne5 32. Nf4 ) 31. f5 White threatens to win material: f5xg6 (31. Re3 Bc6
) 31... Ne5 The knight feels good on e5 (31... c5+ 32. Kc3 Bxe4 33. fxg6
hxg6 34. Nf4 Bxc2 35. Kxc2 ) 32. Nf4 (32. Ba4) 32... Bc6? <dubious> (32...
c5+ must be considered 33. Kc3 Bc6 ) 33. Bd1 Rb8 ??<blunder> ♗lack
falls apart (33... Bd7 34. Bh5 Nc6+ 35. Ke3) 34. Bh5 (34. Ne6+ Ke8 35. Bh5
) 34... Be8 35. Be2 (35. Rg1 ) 35... b5?? <blunder> strolling merrily
down the path to disaster (35... Rb7 ) 36. cxb5 (36. Ne6+
and White can already relax fxe6 37. fxe6 ) 36... Bxb5 ?? <blunder> leading to a
quick end (36... Bd7 ) 37. Rxf7+ !! Double attack: c7/f8 Nxf7 (37...
Nxf7 38. Ne6+ Double attack) (37... Kxf7 38. Rg7+ Mate attack) 38. Ne6+ Ke8
39. Bxb5+ Rxb5 40. Nxc7+ Kd7 41. Nxb5 Rb8 (41... Kc6 is not the saving move
42. a4 Rb8 43. Rg7 ) 42. a4 Kc6 43. Rc3+ (43. Rc3+ Kd7 44. Rc7+ Ke8 45. Kd5
The above may be of interest to those seeking help.
|Sep-03-09|| ||alphee: The appealing doubled rooks on the F column not being able to achieve anything significant by themselves, the knight on e4 was very attractive to me, leading to something like 37. ♘e6+ fxe6 38.f7 ♘xf7 39. fxe6 ♘h6 40. e7+ ♔e8 41. ♗h5+ ♔d7 42. e8=♕#. Unfortunately not all the moves are forced and after some time and using a board 37. ♖xf7+ ♘xf7 38. ♘e6+ ♔e8 39. ♘xc7+ ♔d8 40. ♘xb5 ♖xb5 41. ♗xb5 came up . Not sure I would have played it over the board and under pressure as 37 ....♘xf7 with no clear continuation looked like a show-stopper to me.|
|Sep-03-09|| ||mohitm: hey, Ne6 was looking so promising. Maybe i should work harder to get thursday puzzles|
|Sep-03-09|| ||TheaN: Thursday 4 September
Par (by quite some time, for a puzzle like this (a lot of distinct variations) quite fast).
Candidates: Rg8, Ne6......Rxf7?! [two minutes of calculating] <[Rxf7]>
Okay, I've already said so much that an introduction isn't that much in order. The key move forces a clear win for White, although the initial move looks completely pointless. White breaks the critical defense of e6 with:
<37.Rxf7!!> which deserves two exclamation marks if it were up to me. A shocking move that SEEMS impossible due to the defenses, but in the end, the Black pieces are just wrongly placed. The variations: the rejection is not recommended for Black as this just leaves the White Rook completely inside the Black camp:
<37....Ke8 38.Re7 Kd8 (38....Kf8 39.Ne6 1-0) 39.Ne6 Kc8 40.Rxc7 1-0> and the Black is finally checkmated because his own Rook is in the way. Take note that the e6 square is extremely important, justifying the sacrifice on f7. Then, lets make it a sacrifice. The King captures leaves the majesty himself way too open.
<38....Kxf6 39.Nh5 1-0> which is a nice one. Also a key position, though. It seems as if Black were to escape.
<38....Kf8 39.Ne6 Ke8 40.Re7 1-0> why give away the tempo unnecessarily; the outcome of Ke8 is no different, though.
<38....Ke8 39.Re7 Kf8 (39....Kd8 40.Ne6 Kc8 41.Rxc7 1-0 as in variation A) 40.Ne6 Kg8 41.Rg7 1-0> which is also a nice mate. So, Nxf7 is safest and holds off the attack, right? Somewhat.
<37....Nxf7 38.Ne6 Ke8> now, without any clear mating attacks one is about ready to give up, but actually now such position should be re-evaluated. Okay, no mate, a Rook down, pawn up. Either it's the Rook back or 0-1. Lets just use the forcing moves.
<39.Bxb5> "hey hello, you still on the board?" in all fairness, this shows that all of the White pieces are critical in this combination, making it even better after the shocking key move.
<39....Rxb5 (39....c6 40.Bxc6 1-0) 40.Nxc7 Kd7 41.Nxb5 > and White suddenly converted a King attack in an endgame with two pawns up. Although one of those doubled up, the better White pieces should be able to finish the game easily. Great combination. Time to check.
|Sep-03-09|| ||TheaN: 4/4
Well that is satisfactory ^^.
|Sep-03-09|| ||johnlspouge: Thursday (Medium):
Savchenko vs A Ivanov, 1991 (37.?)
White to play and win.
Material: Even. The Black Kf8 has 1 legal move, e8, and is vulnerable to back-rank mate. The White battery Rg3 and Rg7 has the invasion square g8, so the Black Rh8 bears the absolute burden of protecting g8. The White Nf4 can check on either g6 or e6, and the sequence 37.Ne6+ fxe6 38.fxe6 undoubles the White f-Ps, creating a pair of connected passed Ps. The Black Bb5 threatens Be2, which Nf4 protects. The White K is vulnerable to 37
Nc6+, and 37
Nf3+, suggesting a winning candidate must be a check.
Candidates (37.): Ne6+, Rxf7+
[37.Ne6+ fxe6 accomplishes nothing]
Black can accept the sacrifice in 2 ways:
Kxf7 38.Rg7+ Ke8 [Kxf6 39.Nh5#] [Kf8 39.Ne6+ Ke8 40.Re7#]
39.Re7+ Kd8 [Kf8 40.Ne6#]
40.Ne6+ Kc8 41.Rxc7#
Nxf7 38.Ne6+ Ke8 39.Bxb5+ Rxb5 [c6 40.Bxc6#] 40.Nxc7+
After 41.Nxb5, White is up 2P.
(3) Black can refuse the sacrifice with 37
Ke8, but then the main Variation (1) after 38
|Sep-03-09|| ||johnlspouge: I spent far too much time on the wrong candidate again, a bad habit.|
|Sep-03-09|| ||jheiner: Did this one quick and dirty. ... And missed it.
<johnlsouge: 37.Ne6+ fxe6 accomplishes nothing>
Actually, I had a slight variation and I would have considered it OTB. For counting purposes, two adjacent pawns on the 6th rank is better than a R. So by liquidating the B first...
37.Bxb5 Rxb5 38.Ne6+ fxe6 39.fxe6
click for larger view
with the pc7 hanging, a R on the 7th rank, and the Rh8 can't come into play easily. I would say this is winning for White.
Continuation perhaps: 39...c5+ 40.Kc3 Rb4 41.f7 Nxf7 42.Rxf7+ etc looks good to me.
|Sep-03-09|| ||jheiner: also...41.e7+ Ke8 42.Rg8+ Rxg8 43.Rxg8+ and 44.e8=Q lots of easy continuations I believe.|
|Sep-03-09|| ||CHESSTTCAMPS: <jheimer> wrote <For counting purposes, two adjacent pawns on the 6th rank is better than a R. So by liquidating the B first...>|
Your first statement is close to what I wrote in my first post in the analysis of my Candidate #1, 37... Ne6+, yet I never considered the candidate implied by your second statement. You and <Jimfromprovidence> did a much better job with this than I did.
<mollyboo> wrote <It never ceases to amaze me how different people's brains assess the same position.>
No disagreement here.
|Sep-03-09|| ||WhiteRook48: missed this crazy forking puzzle|
|Sep-03-09|| ||johnlspouge: Hi, <jheiner>.
I ran your two alternatives past Toga for best play. Humans can improve near the end of the complete computer variations.
[ply 15/50 time 00:30 value +0.75]
37.<Nxe6> fxe6 38.Bxb5 c5+ 39.Kc3 exf5 40.Bc4 Nxc4 41.Kxc4 fxe4 42.Kd5 h5 43.Kxe4 Rb1 44.Rd7 Re1+ 45.Kd5 Rh6 46.Rf3 Rd1+ 47.Ke6 Re1+ 48.Kxd6 Rd1+ 49.Ke6 Rxd7 50.Kxd7 Kf7
[ply 15/47 time 01:11 value +2.07]
37.<Bxb5> Rxb5 38.Ne6+ fxe6 39.fxe6 Nc6+ 40.Ke3 Re5 41.Rxc7 Rxe6 42.Rc8+ Re8 43.Rxc6 Kf7 44.Rxd6 Re6 45.Rxe6 Kxe6 46.Rg5 Kxf6 47.Rxa5 Rc8 48.a4 Ke6 49.Rf5 Rc3+ 50.Kd4
I wrote off 37.Bxb5, because it releases tactical tension. Your analysis is essentially correct, however, and 37.Bxb5 appears to win handily (unlike the immediate 37.Ne6+).
|Sep-03-09|| ||Octal: I like the King activity from white.|
|Sep-04-09|| ||VishyAnandFan: this is a marvellous combination
37.Rxf7+ Kxf7 38.Rg7+
never came into my mind, because after
you think ok the rook is en prise and the essential f6-pawn is gone, and you stop the line and go back to the starting position. :)
the mate after 39.Nh5++ is very nice.
|Sep-08-09|| ||LIFE Master AJ: I guessed the correct move almost instantly, the mates were pretty easy to work out. The rest of the analysis was far from easy, however. In fact, going over the game left me with more questions than answers! |
I have already annotated this game. Right now, (Sept 8th, 2009 / 12:24 AM) I am fine tuning it.
By later today, or maybe tomorrow, the web page (for this game) should be ready.
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