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Gosta Stoltz vs Wolfgang Unzicker
Stockholm Interzonal (1952), Stockholm SWE, rd 11, Oct-02
Zukertort Opening: Nimzo-Larsen Variation (A04)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Sep-06-06  goldfarbdj: Got this one in seconds, it was easier than yesterday. Black decoys the queen one square to where she can be picked up by a skewer.
Sep-06-06  patzer2: For today's puzzle solution, the decoy and pin 46...Rb4! sets up a winning skewer.
Sep-06-06  Marmot PFL: Not difficult as a puzzle but a nice finish.
Sep-06-06  RandomVisitor: Looks like there are a few ways for Black to win:
1: G Stoltz - Unzicker Wolfgang, Sweden izt (11) 1952


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Analysis by Rybka 2.1c mp: 21-ply completed

1. (-10.94): 46...Qg4+ 47.Kd3 Qf5+ 48.Kxc3 Rc2+ 49.Kd4 Rxc4+ 50.Kxc4 Qxe6+ 51.Kd3 Qxf6 52.a5 Qa6+ 53.Ke4

2. (-10.12): 46...Qb1+ 47.Kf3 Qf5+ 48.Qf4 Qd5+ 49.Qe4 Rf2+ 50.Kxf2 Qxe4 51.Bxc3 Qc2+ 52.Kf3 Qxc3 53.Ke4

3. (-6.37): 46...Rb4 47.Qxb4 Qg4+ 48.Kd3 Qxb4 49.e7 Qd6+ 50.Kc2 Qd2+ 51.Kb3 Qxe3 52.Bg5 Qe1 53.a5

4. (-2.56): 46...Qc2+ 47.Kd4 Rb7 48.e4 Qd1+ 49.Ke5 c2 50.Bg5 Ra7 51.Qc3 Qb1 52.Bd2 Qb8+ 53.Kd4

(, x 06.09.2006)

Sep-06-06  dzechiel: This took me too long! I became convinced that the first move must be a queen check, and there are four "reasonable" queen checks. While examining each one, I noticed that the check on g4 was forcing in the way the king had to move to protect the queen. At that moment I realized that the rook pin would force the queen to move to where it could not be protected by the king which would win the queen and the game.
Sep-06-06  NakoSonorense: The first move I looked at was Qh1+ but I couldn't find a forcing line that would win the game. So, then I remembered that it was Wednesday and that the moon tonight would look huge cuz it's like only 222,000 miles away. So I went outside, spent 15 minutes looking at it, took some fresh air and came back inside. Then, the first move I saw was Rb4...
Sep-06-06  RandomVisitor: Black might have missed an earlier win: 43...Qe6 44.Qd4 Qf5+ 45.Qf4 c2 46.Qxf5 gxf5 47.Kf4 c1=Q
Sep-06-06  suenteus po 147: A nice skewer puzzle that rewards after you've solved it. Very nice.
Sep-06-06
Premium Chessgames Member
  al wazir: It's interesting that not only was Rybka the only solver to find the more forcing solutions with 46...Qg4+ and 46...Qb1+, but Unzicker missed them too. I'm glad to say that, in this respect at least, I think like a grandmaster.
Sep-06-06  johnnyfroaction: i looked at ...Qg4+ 47. Kd3 Rd2+ 48. Kxc3 Rc2+ 49. Kxc2 Qxc4+ still winning(i think) but not as quickly since it drops the pawn.
Sep-06-06  Confuse: got the beginning but missed the simple queen threatening the pond promotion! cool.
Sep-06-06
Premium Chessgames Member
  An Englishman: Good Evening: White has a dangerous check threat, so Black must do something to prevent mate in two. Naturally, ...Qg4+ came to mind first. Then I thought, "If the K&Q were only one more square apart, I could skewer them. Then I saw that the pin *also* prevents the check.
Sep-06-06
Premium Chessgames Member
  jahhaj: Miscalculated this. I saw johnnyfroaction's line but if 47.Kd5 I wanted to play 47...Rd2+ 48.Kc5 Qf5+ winning the bishop but I missed 48.Bd4. Correct is 47...Qf5+ and only if 48.Be5 then 48...Rd2+. So right idea, wrong move order.

Unzicker's move is easily the best however, whatever Rybka says.

Sep-06-06  KOCCMOHAYT: got this one instantly
Sep-06-06  vibes43: Got it with a little effort but probably wouldnt't have in the heat of battle. Here I always know there is something to look for but my skills are improving. What a great site.
Sep-06-06  EmperorAtahualpa: <i looked at ...Qg4+ 47. Kd3 Rd2+ 48. Kxc3 Rc2+ 49. Kxc2 Qxc4+ still winning(i think) but not as quickly since it drops the pawn.>

<johnnyfroaction> Same here.

Sep-06-06  prinsallan: Easier than wednesdays in general.
Sep-06-06  patzer2: In picking among candidate moves to solve a combination, IMO it is better for most human players to look for and select the faster and simpler solution(s), because:

1. It takes longer to find additional decisive solutions, and making this a habit could put you in time trouble in OTB games.

2. The chance of your opponent finding a refutation to your combination is greater in longer and more complex combinations.

3. Few humans have near the accuracy or speed of a computer in calculating long and complex combinations, so the chances of error or oversight are greater.

4. More than one world champion has said long analysis should be viewed with caution and they prefer simpler decisive solutions (especially in practical OTB play).

Sep-06-06  ahmadov: This one was an easy one for me as well.
Sep-06-06  LIFE Master AJ: I spent all of my time looking at Qg4+. (I was not convinced other moves were as forcing.) It was nice to know that Fritz agrees with me.
Sep-06-06  Halldor: Very nice puzzle - got it when I saw that 46.Qg4+ wouldn't work at once.
Sep-06-06  Halldor: Yes, Fritz likes 46...Qg4+, - I however stopped working on it when I saw that 46...Rb4 works.
Sep-06-06  Larsker: Fine puzzle. I'm 3 out of 3 this week until now. The over-my-head ones usually come later in the week.
Sep-06-06  mikejaqua: Got this one quickly, but I missed the pawn headed for e8. Would have been OK in a game as it was easy to catch though. Still it points out the importance of analyzing thoroughly.
Sep-06-06  zb2cr: I agree with a previous poster--this one was easier than yesterday. Saw it in a matter of less than 20 seconds.
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