< Earlier Kibitzing · PAGE 2 OF 3 ·
|May-16-10|| ||jheiner: Sunday. Difficulty Insane. Black to Play
Material: down the Exchange (N+P for R). Backwards P on e6 is weak and blocking in the Light B on d7. N on g4 is hanging. Q and R on f file form a battery. Q threatens mate on h2 defended by Nf3, but White can remove the threat with hxg4. Black K is secure from checks. White Pa2, Bb4, and Ph3 hang. e4 is loose.
Problems to solve:
1. The hanging Ng4.
2. Need to activate the Bd7 and Nc6.
3. Backwards pawn on e6.
Candidates: Nxd4, Nce5, e5, Nge5, Ne3
Black has a LOT of options here and has great counterplay for the exchange sac that happened earlier. How to convert? After a lot of thought and looking at lines (Nxd4, Nce5, e5, Nge5, Ne3), the important points are these:
1. The Ng4 is going to fall, or rather Black will sack a N for this attack. If Ng4 goes immediately (hxg4) then White has defenses. (20.hxg4 Qxg4+ 21.Kh1 Rc6 22.Nh2 creates a bit of a fortress and c3 is secure)
2. The c3 square is all important. And Black can overload there if he can save a N and activate his pieces.
3. The threat on h2# is defensible, and something slow releasing the B to come to h3 is also defensible.
I stared at this for a long time and looked at lots of lines. I couldn't see it and I would probably choose OTB:
A. 20.dxe4 Ncxe4 21.hxg4 Nxf3+ 22.Rxf3 Qxf3 23.Qxf3 Rxf3 looks good for Black
B. 20.hxg4 Qxg4+ 21.Kh1 (Kh2 invites perpetual?) Qh5+...
with threats of Bg4, e4 etc.
Time to check. ... Stunning that this was calculated. Time to read the kibitzing.
After reading and thinking a bit, my issues is that Kh1, Nh2 looked defensible to me. But Qg4+ x-rays the Qd1 which is the reason Bxb4 was a real threat. I believed White could give back the exchange, and set up in the corner. The follow on with the d4 push covering e3 was stunning. Shows great creativity and faith in ones own abilities to play something like this OTB. Great puzzle! Great dynamic chess!
|May-16-10|| ||An Englishman: Good Morning: The oddity is that I was able to use retrograde analysis and work out the previous moves, from 15.Bb5 through 19.h3--however, I could not see the ensuing moves. I actually rejected 19...Nce5 because I thought 21.Qd4 won!|
My ultimate choice was 19...e5. Anyone know what's wrong with it?
|May-16-10|| ||patzer2: For today's Sunday puzzle solution, 19...Nce5!! serves up a smorgasbord of combined operations, featuring the clearance, deflection, decoy, pinning and mate threat tactics:|
The tempting 19... Nxd4?? drops a piece without sufficient compensation after 20. Qxd4 Bxb5 21. Qxf4 Rxf4 22. hxg4 Bxf1 23. Kxf1 Kf7 (23... Rxg4? 24. Rc8+ Kf7 25. Ne5+ ) 24. Rc7+ Kf6 25. g5+ Kg6 26. Ke2 Re4+ 27. Kd2 Rb4 28. b3 .
No better for White is 20. hxg4 Qxg4+ 21. Kh2 Nxf3+ 22. Rxf3 (22. Kh1 Qh3#) 22... Rxf3 23. Qxf3 Qxf3 24. Bxd7 Qf7 25. Bb5 (25. Bc8?? Qc7+ ) 25... Qf4+ 26. Kg2 Qg4+ 27. Kh1 Qxd4 28. b3 e5
Even worse for white is 20. Bxd7?? Nxf3+ 21. Kg2 Qh2#.
<20... Bxb5 21. Re1>
If 21. hxg4, White is busted after 21...Qxg4+ 22. Kh2 Bxf1 23. Qxf1 Rxf3 24. Rc8+ Rf8 .
<21... Nxf2!> With this sham sacrifice, Black's idea is to create a decisive pin with mate threats.
<22. Kxf2 d4!> An essential followup and clever deflection that tightens the noose and leaves the Rook with no safe haven.
< 23. Rd3>
Allowing mate-in-one is 23. Ra3?? Qh2#
<23... Qh2+ 24. Kf1 Qg3 0-1>
White resigns in lieu of such possibilities as 25. Re2 Bxd3 26. Qxd3 Rxf3+ .
|May-16-10|| ||jheiner: Just one more thing. I think it just made my day to see a "boring" French defense transformed into this!? (Maybe this is theory but new to me.) It gave me a moment of intense joy to see 8...f6 attacking the head of the pawn chain!? Following up with an exchange sac on f4 that just seems to flow, but for most players (ahem, me) wouldn't it putter out into nothing? So many places this attack could have gone wrong.|
|May-16-10|| ||johnlspouge: < <jheiner> wrote: [snip] Stunning that this was calculated. [snip] >|
Hi, <jheiner>. To play the candidate, you "only" need to calculate to
< [snip] 20…Bxb5 (threatening 21…Bxf1)
Black has stabilized the center, with a rock-solid base Pe6. His Ng4 is now immune [snip] >
After that, you know that you have the right candidate: the variation is at worst drawing, even if you just quietly withdraw Ng4.
That is not to say I am unimpressed that Ulibin played the sacrifice over the board :>P
|May-16-10|| ||Eduardo Leon: The white knight cannot afford to be displaced or captured, so we can activate our seemingly bad bishop by playing 19...ce5. (19...xd4 20.xd4, white threatening to exchange queens, cannot be good for us in any way). Considering that white's reply is be forced, we are left with|
<19...ce5 20.dxe5 xb5>
click for larger view
We are threatening 20...xf1, not only recovering the exchange, but also potentially displacing the white queen from the defense of the knight. 21.hxg4 is not good enough for white: 21...xg4+ 22.h1 xf1 23.xf1 xf3 24.c8+ f7 25.c7+ g6 26.b1+ h6 27.c1+ h5. (Even though this is the best defense, this is not the deepest line, thus, we do not consider this to be the main line.)
click for larger view
Now we have to open the f file, so our rook can come to life. The only way to achieve this is the sacrifice (21...xf2!), which white is forced to accept, since both 22...g3+ and 22...xd1 are threatened.
<21...xf2! 22.xf2 d4!>
click for larger view
We threaten mate in one. 23.d3 only delays the mate: 23...h2+ 24.f1 g3 25.e2 xf3+ 26.d2 xd3+ 27.c1 c8+ 28.c2 xc2#. The only other possibility we can see is
<23.e2 xe2 24.xe2 dxc3 25.bxc3 h2+ 26.e3 xh3>
There are two ways to win: A.Simplify all pieces and use our kingside pawns to tie the white king to that flank. B.Use the g pawn to eventually win the white knight.
We guess white resigned after 22...d4!.
|May-16-10|| ||RandomVisitor: After 21.Qd4 Bxf1 22.Qxf4 Rxf4 23.Rc8+ Kf7 24.Ng5+ Kg6 25.Nxe6 :|
<[-0.49] d=27 25...Rc4> 26.Rxc4
|May-16-10|| ||Eduardo Leon: 15.d2 would have saved white from all his subsequent troubles.|
|May-16-10|| ||VincentL: I have looked at this position for some time, and one key element seems to be the white knight on f3. If this can be dislodged (or captured) white's defences start to fall apart. Indeed if it were not for this knight, Qh2 would be mate.|
At first I thought about Nxd4, but this brings the white queen into play, which I don't like.
Now I am considering putting a knight on e5 - the question is, which one?
Nce5 seems better, because it activates the black bishop, and also after 20. dxe5 Bxb5 the white rook must move from f1 - 21. Re1. But now what is the continuation? I am looking at 21....Nh2. But after 22. Nxh2 Qxf2+ I cannot find the mate.
Maybe I am not on the right track at all.
Time has run out for me and I am going to check.
|May-16-10|| ||chrisowen: That Qc7 idea she stoops to conquer the king saccin Ulibin's rook in f4. Finding flight flinging from all angles the pieces are a litter rationing white waiting on the wings. See gullable hit 19.h3 mistakes of a knight back. Ne5's con, stance taken eases the black position tipping it reasonably ushering Bxb5. The rook goes over board handing knight cashes in f2. Affording pawn push does mar with queen check next flat in finis him.|
|May-16-10|| ||VincentL: Can white play 23. Rg1? I have played through a some lines, and black emerges two pawns up, but still with work to do.|
|May-16-10|| ||tacticalmonster: 1) removal of defender: Remove the knight on f3 and it would be mate. If d4 pawn is gone, Both BN have access to e5 square|
2) loose or hanging piece: Bd7, Bb5 , Ng5 and h3
3) underdefended pieces: f3 knight was insufficently defended. It was attacked twice and defended twice.
4) partial pin: Bb5 pinned the c6 Knight. But the Knight could still move despite dropping d7 bishop
5) exposed White king: WK missed the protection of g pawn
6) material: Black had N and 1 P for rook
7) out of play piece: f1 rook
candidate: 19 Nce5
a) 20 hxg4 Qxg4+ 21 Kh1 Nxf3 22 Rxf3 Rxf3
b1) 20 dxe5 Bxb5 21 hxg4 Qxg4+ 22 Kh2 Bxf1 23 Qxf1 Rxf3 24 Rxf3 Qxf3 Black is up two pawns plus attacking chance against White king
b2) 21 Re1 Nxf2!! 22 Kxf2 Qh2+ 23 Ke3 Qf4+ 24 Kf2 d4! 25 Rd3 Qh2+ 26 Kf1 Qg3! heavy loss of material for White
|May-16-10|| ||cjgone: I chose e5 which I attempted to transpose into the Ne5 position, meh.|
|May-16-10|| ||patzer2: <Random Visitor> Looks like 21. Qd4! holds the draw for white. In your 27 ply Rybka line, I don't see any real winning chances for Black.|
|May-16-10|| ||patzer2: I guess the reason I didn't consider 21. Qd4! is that when two pieces are en prise, one feels obligated to move one of them out of "danger." Of course in this case, the greater danger is allowing the Black Queen to remain on the board.|
|May-16-10|| ||wals: Too classy for me.
Rybka 3 1-cpu: 3071mb hash: depth 16:
White material, a Rook for a Knight and pawn.
-0.61 19.h3. a costly move.
1. = (0.00): 19.Bxc6 Bxc6 20.h3 Bb5 21.Re1 Nxf2 22.Kxf2 Qh2+ 23.Ke3 Qf4+ 24.Kf2 Qh2+ 25.Ke3 Qf4+ 26.Kf2 Qh2+ 27.Ke3 Qf4+ 28.Kf2 Qh2+ 29.Ke3 Qf4+ 30.Kf2 Qh2+ 31.Ke3 Qf4+ 32.Kf2 Qh2+ 33.Ke3 Qf4+ 34.Kf2
2. = (0.00): 19.Qd2 Qd6 20.h3 Nf6 21.Bxc6 Bxc6 22.Rb3 Ne4 23.Qe3 Ng3 24.fxg3 Qxg3+ 25.Kh1 Qxh3+ 26.Kg1 Qg3+ 27.Kh1 Qh3+ 28.Kg1 Qg3+ 29.Kh1 Qh3+ 30.Kg1 Qg3+ 31.Kh1 Qh3+ 32.Kg1 Qg3+ 33.Kh1 Qh3+ 34.Kg1
3. = (0.00): 19.a4 e5 20.Bxc6 bxc6 21.dxe5 Nxe5 22.Nxe5 Qxe5 23.Qc1 Qd6 24.Re1 d4 25.Rg3 c5 26.Qc4+ Kh8 27.b3 g6 28.a5 a6
4. = (-0.12): 19.Re1 Nf6 20.Bxc6 Bxc6 21.Ne5 Ne4 22.Rc2 Nxf2 23.Qd2 Nh3+ 24.Kg2 Qf5 25.Rc3 Ng5 26.Qe2 Bb5 27.Qe3 Ne4 28.Rc7 Bf1+ 29.Kh1 Bh3 30.Rg1 Kh8 31.Rc2 Bf1
5. = (-0.14): 19.Rb3 Qd6 20.h3 Rxf3 21.hxg4 Rf4 22.Bxc6 Bxc6 23.Qe2 Rxd4 24.Re1 Rf4 25.Qxe6+ Qxe6 26.Rxe6 Kf7 27.Ree3 Rxg4+ 28.Rg3 Rc4 29.Rbc3 g6
White material, a Rook for a Bishop and pawn.
1. (-0.61): 21.Qd4 Bxf1 22.Qxf4 Rxf4 23.Rc8+ Kf7 24.Ng5+ Kg6 25.Nxe6 Re4 26.hxg4 Be2 27.Rc7 Bxg4 28.Rxg7+ Kh6 29.Rf7 Bxe6 30.Rf6+ Kg5 31.Rxe6 Re2 32.Rd6 Rxb2
2. (-0.61): 21.Qc1 Bxf1 22.Qxf4 Rxf4 23.Rc8+ Kf7 24.Ng5+ Kg6 25.Nxe6 Re4 26.hxg4 Be2 27.Rc7 Bxg4 28.Rxg7+ Kh6 29.Rf7 Bxe6 30.Rf6+ Kg5 31.Rxe6 Re2 32.Rd6 Rxb2
3. (-0.88): 21.Qd2 Qxd2 22.Nxd2 Bxf1 23.hxg4 Be2 24.Rc7 b5 25.Rxa7 Bxg4 26.Rb7 Rf5 27.Rxb5 Rxe5 28.a4 Re2 29.Nf1 Re1 30.Kg2 Be2
4. (-2.09): 21.a3 Bxf1 22.hxg4 Bh3 23.Qd4 Bxg4 24.Qxf4 Rxf4 25.Nd2 g5 26.f3 Bh5 27.Kf2 Kg7 28.Rc8 Rf8 29.Rxf8 Kxf8 30.Nb3 Kf7
White material, Rook and Knight for Bishop and two pawns.
1. (-5.71): 23.Rg1 dxc3
2. (-6.77): 23.Kg2 dxc3
3. (-7.85): 23.Qxd4 Qxd4+
4. (-10.23): 23.Ree3 Qh2+
5. (-10.24): 23.Re4 Qh2+
-16.00 24.Kf1 Qg3 White resigns.
|May-16-10|| ||jheiner: Hi <johnlspouge wrote: To play the candidate, you "only" need to calculate...> 19...Ne5 20.exd5 Bxb5 (threatening Rf1).|
Thanks for the feedback. That's why I show up. Got a lot out of everyone's analysis today. Two points stand out.
1. The simple combination above doesn't serve up an immediate tactical advantage, but rather a positional one. Ironically in my analysis, I identified those three positional weaknesses (backwards e6 pawn, inactive Bd7, hanging Ng4) that needed solutions, but didn't see how effectively Ne5 solved all three in two tempos. But good to see in retrospect that I was on the right track. Getting there.
2. The need to visualize [potential] pins around the enemy King when planning an assault. While the f3 square was critical, ultimately Ulibin was able to simply attack around f3 into f2, converting the latent f-file battery into huge, active threats that ultimately won the game.
|May-16-10|| ||David2009: M Sorokin vs Ulibin, 1986 Black 19...? Insane|
Black has sacrificed the exchange for a Pawn to reach a complex tactical position: is he right?
White has King side weaknesses and hanging pieces. Looking at forcing continuations, 19...Nxd4 looks promising. First variation:
20 Qxd4 Bxb5 21 Rd1 Be2 and White's pieces are hanging. Instead 21 Qxf4 Rxf4 22 h3xg4 Rxg4+ 23 Kh1 Bxf1 24 Nh2 Rh4 and Black has won material.
Time to see how the game went.
19...Nce5 was played. Ah well.
Playing through the variation, my line is a blunder: 19...Nxd4? 20 Qxd4 Bxb5 21 hxg4! wins a piece <johnlspouge>.
<An Englishman: [snip] My ultimate choice was 19...e5. Anyone know what's wrong with it?> White takes the Ng4 and weathers the storm e.g. 19...e5 20.hxg4 Bxg4 21.Be2 e4 22.Nh2 Bxe2
23.Qxe2 Nxd4 24.Qd1 Nf3+
click for larger view
and now 25.Rxf3! exf3 26.Qxd5+ Kh8 27.Re1 leaves White with N for 2P.
Crafty End Game Trainer on-link to the position withe White to play one move before the puzzle:
If you play 19. h3 Crafty finds Nce5! and you can try the various White defences posted by others.
|May-16-10|| ||Jimfromprovidence: FYI... My first grandson was born today, around 1 PM PDT. He's a healthy 6 lb. 13 oz. and 20 inches long.|
No time for chess today!
|May-16-10|| ||Sularus: ^^ congrats jim!
so the future world chess champion was born today eh!
|May-16-10|| ||johnlspouge: < <Jimfromprovidence> wrote: FYI... My first grandson was born today, around 1 PM PDT. >|
Nature is sometimes kind: things you might dread at a younger age, like being a grandfather, often become joys as you age.
Congratulations on your first grandson, <Jim>!
|May-16-10|| ||johnlspouge: < <jheiner> wrote: Hi <johnlspouge wrote: To play the candidate, you "only" need to calculate...> 19...Ne5 20.exd5 Bxb5 (threatening Rf1). >|
Thanks for the feedback. >
Hi, <jheiner>. I am glad that someone else can make use of my long-winded, solipsistic screeds. You are welcome.
< But good to see in retrospect that I was on the right track. Getting there. >
When I miss nowadays, my preliminary analysis often summarizes precisely the features of the winning combination. Today, I spent too much time on the 2 bad candidates (Nxd4 and Nxf2), but I know exactly the feeling you convey with your words, "getting there" :)
|May-16-10|| ||TheBish: M Sorokin vs Ulibin, 1986|
Black to play (19...?) "Insane"
By jove, I think I've got it! If so, this would have been a perfect week for me if not for my quick rush to judgment on Wednesday, when I tried to make an easy win even easier!
Here, White is up an exchange (rook for knight) for a pawn, but Black has a pretty strong attack brewing (time to finish my coffee) and White has a weakened king position, especially the light squares, f3 and h3; furthermore, if Black could somehow dislodge the knight on f3, he would have mate on h2.
This amazing move (which I found after eliminating other candidate moves like e5 and Nxd4) unleashes the full potential of Black's pieces, uncovering an attack on White's bishop while threatening no less than mate with 20...Nxf3+ and 21...Qh2#. So not really a piece sacrifice per se, as Black comes out ahead tactically. Now, White can rule out 20. Bxd7?? Nxf3+ followed by mate, as well as 20. Nxe5?? Qh2#. He must either play 20. dxe5 or 20. hxg4, but the latter can be quickly dismissed as well.
A) 20. hxg4 Qxg4+ 21. Kh2 (Kh1 is even worse) Nxf3+ 22. Rxf3 Rxf3 and the only way to stop mate is to give up White's queen, i.e. 23. Qxf3 Qxf3 24. Bxd7 Kf7! and Black is way up in material (Q+2P vs R+B), with more pawns to fall starting with the d4 pawn.
B) 20. dxe5 Bxb5 21. Re1
or 21. hxg4 Qxg4+ 22. Kh2 Bxf1 23. Qxf1 Rxf3 24. Rxf3 Qxf3, an easy Q+P endgame where Black queens the d-pawn, or 21. Qd2 Bxf1 22. Qxf4 Rxf4 23. Kxf1 Rxf3! 24. Rxf3 Nh2+, converting to an easy K+P endgame with Black a protected passed pawn ahead.
This move demolishes the remaining defenses, threatening both the queen and Qg3#, so the knight must be accepted.
22. Kxf2 d4! (threatening both dxc3 and Qh2#) 23. Rd3 Qh2+ 24. Kf1 Qg3!, and White is fit to be tied up! White must now resign, or face the likes of 25. Re2 Bxd3 26. Qxd3 Rxf3+, or 25. Ke2 Qxf3+ 26. Kd2 Qxd3+ 27. Kc1 Rc8+ 28. Qc2 Qxc2#.
Time to see how (or if) Black finished him off.
|May-16-10|| ||TheBish: Funny, but in my post I just realized that in the last variation, after 25. Ke2, Black has the much shorter mate with 25...Qg2#! When you see a crushing move, you normally go ahead with it, unless it's a problem! But even here the maxim applies - if you see a good move, look for a better one!|
|May-16-10|| ||tivrfoa: <patzer2> 21. Qd4 is good, but black can force the exchanges and white would not be able to stop the passed pawn.|
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