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Danilo Volpinari vs Mateus Felizardo Viageiro Alice
Dresden Olympiad (2008), Dresden GER, rd 9, Nov-22
Sicilian Defense: Najdorf. Opocensky Variation Traditional Line (B92)  ·  0-1



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sac: 33...Qxg3+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Jan-01-09  vaskokibika: Happy New Year!
For puzzle solvers I'll give a simple position I saw in a game between 2 amateurs:

click for larger view

How much time you need to find a WIN FOR BLACK?

Jan-01-09  xrt999: < sleepyirv: <MAJ> Are you sure? 34.Kg1 and what's the continuation? In this situation, White is protecting the f1 square so White won't have the mate on it. 34...Nf3+ 35.Rxf3 Qe1+ 36.Rf1 and White is fine.>

go back to sleep

Jan-01-09  skemup: I like kind of puzzle like this, it simple becouse all black moves had to be forced (treaten of mate). I did not found Qf4 but Qe4+ which is winning move so i feel that yesterday vodka did not hurt me so much:)For me this one puzzle was tuesday-wensday level.
Jan-01-09  xrt999: I would have played 36.Qxd6 Ne4+ 37.Kg2 Nxd6; although black is winning (up a knight and a pawn), WHITE has a passed pawn on d5, and although it is wishful thinking, I probably would continue as white. In the actual line, BLACK now has the passed pawn and is up one additional pawn and is completely crushing.

If you are going to play it as white, you should at least take advantage of this slight nuance.

Jan-01-09  YouRang: Interesting puzzle. We have 32...Qxd3 picking up a free piece staring us in the face. Apparently, the point of the puzzle it to see if we can survive the resulting counter-attack, 33.Qh6, where we are facing mate-in-1. In fact, there is no way to defend our king at this point except to keep white in check.

So, I see 33...Qe4+, which forces the white K to a square (f2, g1 or h2) where we can deliver check with our knight -- which is good because we badly want to move our knight (if for no other reason) to vacate e5, clearing the path for both our rook and our bishop.

So, we just have to check out those 3 options for white:

If 34.Kf2, then 34...Nd3+ 35.Kg1 Qe3+ 35.Kh1 (if anything else, 35...Qxg3+ ~#) Nf2+ 36.Rxf2 Qe1+

If 34.Kg1, then 34...Nf3+ 35.Rxf3 (if king move, then 35...Nh4++ & 36...Qg2#) Qe2+ and sooner or later, we bring the rook in at e2 or e1 with check, or play Qxg3 with check, winning.

If 35.Kh2, then it's pretty much the same as 34.Kg1.

Actually, a bit easier than yesterday IMHO.

Premium Chessgames Member
  Jimfromprovidence: White tried to get cute with 32 Bf6?, when he should have tried to exchange queens with 32 Bc2 (below) or 32 Bb1.

click for larger view

Happy new year to everyone from foggy So. Cal.

Jan-01-09  Patriot: Black to play: "Medium"

Materially, white is a little better since they have the bishop pair. White threatens Qh6 and mate on g7 or h8. But it looks like black can win a piece with Qxd3. Let's see if it works:

32...Qxd3 33.Qh6 This seems to be the only forcing move to consider for white, since 33.Qxd3 Nxd3 just concedes a piece.

Now 33...Qxg3+ 34.Kxg3 Ng4+ 35.(K moves) Nxh6 wins a piece and a pawn. And if after 33...Qxg3+ 34.Kh1, black has at least 34...Qxh3+ 35.Kg1 Qh2+ 36.Kxh2 Ng4+ and Nxh6--not that this is necessarily best. OTB, this line is already winning so analyzing further would be a waste of precious clock time. When move 33... arrives, I would consider Re2+ to see if it's better than the Qxg3+ line.

Another line may go: 32...Qxd3 33.Qh6 Qxg3+ 34.Kxg3 Ng4+ 35.Qf4 Nxf6! 36.Qxd6 Ne4+ and 37.Nxd6 which simplifies in black's favor.

Jan-01-09  Samagonka: Well wishes for 2009 to you all.
Jan-01-09  arnaud1959: I first found the solution but afterwards I thought I was wrong, thinking that I was only 1 pawn up. Can you imagine missing a great combination because you miscount pieces??
Jan-01-09  Alphastar: I followed the game continuation, though I missed 35. ..Nxf6! but I think that I would've found the move if we got to that position.

I didn't like Qe4+ because as far as I could see black wouldn't be able to immediately checkmate white whereas Qxg3+ is the safe solution. But I dismissed Qe4+ too early I see.

Happy new year all! Anyone have any chess resolutions for this year?

Jan-01-09  xrt999: <Jimfromprovidence: White tried to get cute with 32 Bf6?, when he should have tried to exchange queens with 32 Bc2 (below) or 32 Bb1.>

32.Bf6 is attacking; obviously white is thinking 33.Qh6 and 34.Qh8++. Black must respond quickly and accurately as the threat is real. I dont think attacking here is "getting cute", but more of a miscalculation on white's part.

If I didnt know this was a puzzle I would probably make the incorrect move 32...Kh7 and miss the counterattack. White is hanging a piece, afterall, and is threatening mate! Why would white hang a piece if he didnt see something more mate? Psychologically, it would be hard to sit there facing Qh6 and start calculating lines of counterattack. To Black's credit, he did.

But, since I knew this was a puzzle, black to move, I knew that ...Kh7 was not the line and immediately discarded it.

Jan-01-09  fosca: MAJ,

What sweet words you wrote:

"33 ... Qe4 + is way better."

The game continuation made me think I missed something which, of course, means I must not have seen the solution sufficiently clearly to take credit...

Premium Chessgames Member
  Jimfromprovidence: <xrt999> <32.Bf6 is attacking; obviously white is thinking 33.Qh6 and 34.Qh8++. Black must respond quickly and accurately as the threat is real. I dont think attacking here is "getting cute", but more of a miscalculation on white's part.>

You are right about the gravity of the threats. (There was also a pin on black's knight).

Speaking for myself, I saw 32...Qxd3 right away, and if 33 Qh6, then 33...Qe4+ looked good.

I did not see every move of the mating sequence, but with white's queen unable to help after 33 Qh6, I hope I would have played 33...Qe4+ instinctively.

Jan-01-09  Patriot: Yes it does look like 33...Qe4+ is much better, so good job to those who found it. But I would feel much safer playing Qxg3+ because there is less to calculate and is clearly winning to me with no risk. So personally I think Qxg3+ is the most practical choice.
Jan-01-09  bullsbehad: Happy new year! I did not see this from any angle, hats off to those who did...quite the pristine combo played by black.

I am going to blame my miss on the hangover. :o)

Premium Chessgames Member
  agb2002: The bishop on d3 is hanging, apparently. Therefore, 32... Qxd3

A) 33.Qxd3 Nxd3 and Black is a knight ahead.

B) 33.Qh6 Qxg3+

B.1) 34.Kxg3 Ng4+

B.1.a) 35.K moves (or 35.Rf4) Nxh6 with N+P ahead.

B.1.b) 35.Be5 Bxe5+ 36.Qf4 (otherwise 36... Nxh6) Bxf4+, again N+P up.

B.1.c) 35.Qf4 Nxf6 36.Qxd6 (otherwise 36... Bxf4) Ne4+ and Nxd6, again N+P up.

B.2) 34.Kh1 Qxh3+ 35.Kg1 Qg3+ 36.Kh1 Qh2+ 37.Kxh2 Ng4+ and Nxh6, now N+2P ahead.

Let’s see how I have started the new year.

Jan-01-09  Alphastar: <Patriot> It just depends on the type of player you are whether that is the most practical solution - some players are especially good in mating attacks and might make lots of mistakes even though being a piece up in the ending. They might have calculated all the mating lines and then find that a 'safe solution' in comparison to slugging it out in the endgame - others might not be sure that black has a mate and prefer to win comfortably in the endgame.

There's only one thing to be said and that is that Qe4+ is objectively better and will be found by players who calculated it out precisely.

Premium Chessgames Member
  Kasputin: Happy New Year to all!

Interesting. In a lot of these chessgames puzzles the side to move usually has some shocker move that causes the other side to react and to try and mount the best defence possible (sometimes there are surprisingly good defences missed by the defending side and by the chessgames puzzle pickers).

This case is a little different. Black can pick up a piece with 32 ...Qxd3. But this allows 33. Qh6 and white threatens mate next move. Seeing this I have to admit that I looked at a lot of alternative 32 moves for black: ...Nf3 ...Ng4 ...Nxc4 ...Nxd3 ...Bf8 ...Kh7

I wasn't really very happy with any of those alternatives (some of course for fairly obvious reasons). Actually 32 ...Kh7 is not a horrible move (I think white's best reply is 33. Re1) but clearly I missed the whole point of the puzzle.

I then gave up and peeked at the actual move 32 as played in the game. After seeing the intial move was indeed 32 ...Qxd3 I then thought about how the rest of the game must have unfolded - but not with much effort I must admit.

My mistake was obviously to have given up on 32 ...Qxd3 too quickly. For some reason I didn't bother to try and see if black had enough forcing moves to win this one. Still I am not sure that I could have calculated this one out accurately, even if I was convinced from the outset that ...Qxd3 was the correct move. I am pretty sure I would have played 32 ...Kh7 in a real game situation.

I have recently taken a break from these daily puzzles. Is it me or are these harder? I used to get Wednesday and Thursday puzzles (not always but fairly often) and then have difficulties with Fridays. Oh well maybe this is just a tough week.

Jan-01-09  Patriot: <Alphastar> I agree very much with what you said. The practicality may depend on a lot of things including what you analyse first and how much time is remaining.

Before playing 32...Qxd3 and seeing the strong threat 33.Qh6 I would "test" the line 33...Qxg3+ first and seeing that it is winning I would go ahead and play 32...Qxd3 and hit the clock. After white actually plays 33.Qh6 and if I have plenty of time on the clock then I may spend time looking at moves like Qe4+.

I spoke with NM Dan Heisman on this and the first thing he analyzed was the Qxg3+ line. He said IM Donald Byrne showed him a position years ago and Byrne asked him what he was thinking about because a certain line won a piece. Dan said he was trying to see if there was a forced mate, and Byrne said "Don't! With the extra piece and as good of a player as you are, any grandmaster would resign against you."

Dan said that after a game Kramnik was asked why he didn't play another line for a shorter win and he replied he saw a winning line and there was no need to look at it further.

Dan also said if he had 7 minutes left on the clock he would go ahead and play Qxg3+ and win the endgame easily in those 7 minutes. But if he had 2 hours left on the clock, he would spend time looking at Qe4+ to see if it's better.

So I think the practicality depends mostly on how much time is remaining on the clock, and if there is plenty of time it depends a lot on the complexity of the lines. If there is any remote possibility that I missed a refutation somewhere then I would rather play the second best move knowing I can win it easily.

Jan-03-09  njchess: I was looking at this position when I realized that I remembered it from the recent Olympiad.
Premium Chessgames Member
  patzer2: For the January 1, 2009 puzzle solution, Black initiates a winning combination with a number of tactical themes, beginning with the piece capture 32...Qxd3!

On the surface, it appears 32...Qxd3! is refuted by 33. Qh6 with a mate threat. However, after the clever 33...Qxg3+! 34. Kxg3 Ng4+! Black uses a discovered check, a pin and the threat of a Knight Fork to turn the tables on White's mate threat and win decisive material.

Premium Chessgames Member
  patzer2: In addition to the discovered check, pinning and Knight Fork tactics, the move 32...Qxd3! involves the decoy and deflection tactics as well.

Also, if White declines the Queen's decoy sham sacrifice, Black has a mate-in-four after 34. Kh1 Qxh3+ 35. Kg1 Nf3+ 36. Rxf3 (36. Kf2 Qg3#) 36... Re1+ 37. Kf2 (37. Rf1 Rxf1#) 37... Qf1#.

Feb-27-09  wolfmaster: I suggest, "Alice in Blunderland."
Premium Chessgames Member
  FSR: Go Ask Alice.
Premium Chessgames Member
  perfidious: All The Girls Love Alice.
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