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Milos Pavlovic vs Goran Cabrilo
Cacak (1991), rd 5
King's Indian Defense: Saemisch Variation (E80)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 3 ·  Later Kibitzing>
Nov-19-09  Marmot PFL: Castling queenside is not always so bad - I Nei vs Suetin, 1960
Nov-19-09  goodevans: It took me about 2 minutes to see 15 ... Nb3+ but as soon as I saw it I knew it was right!

We're very used to seeing the <reload> tactic with rooks, but this is a nice example of its use with knights.

Nov-19-09
Premium Chessgames Member
  mike1: like the puzzle, took me too long
but found it. But am writing because
Pavlovic missed a draw I think.
He could have played 29. b7+ Kxb7
30.Rhb1+ Kc8 31.Nxd6+ and Ra7+ Ra8+
makes it a draw.
Nov-19-09  antharis: Well it took a bit but I hope 15... Nb3+ is correct. 16. axb3 Nc5 threatening Nb3+ again (white cant cover this square) with either queenwin or mate if the Queen moves away.

Time to check.

Nov-19-09  Patriot: This didn't take long to spot 15...Nb3+! 16.axb3 Nc5 and white is surely lost.

I really like how black finished off the combination after 17.Bd3. He could've played 17...Nxb3+ 18.Kc2 Nxd2 19.Bxf5 Nxc4. In this line white has two pieces (+6.5) plus the bishop pair (+0.5) vs. queen (-9.75) plus 2 pawns (-2)--giving black a material evaluation of about -4.75 pawns. In the line black actually played after 17...Bxd3 18.Nxd3 Nxb3+ 19.Kc2 Nxd2 20.Bxd2, white has two pieces (+6.5) vs. queen (-9.75) plus a pawn (-1)--giving black a material evaluation of about -4.25 pawns.

This doesn't include dynamic evaluation but even though materially black is less favorable in his line, I like it better because there are simply fewer pieces on the board.

I wonder how Rybka or Fritz evaluates the two lines?

Nov-19-09  JG27Pyth: Satisfying unusual puzzle, sort of a Knight 'reloader' -- White's lack of a good answer is shocking. I think part of what makes the puzzle so pleasant is NOT having the White pieces. What a misery it is to have a move, and there's nothing to do with it but wait for the ax to fall.
Nov-19-09  5hrsolver: I got this one rather quickly again although the two knight jump is not an idea I have seen before.

<mike1:
Pavlovic missed a draw I think.
He could have played 29. b7+ Kxb7
30.Rhb1+ Kc8 31.Nxd6+ and Ra7+ Ra8+
makes it a draw.>

29. b7+ Kb8 Cabrilo does not have to take the pawn. Meanwhile Pavlovic has to attend to the threat of Rxd3 by black. There is also the mobile h pawn that is ready to zoom down.

I like the way Cabrilo kept the attack going instead of just hanging on to his material advantage.

Nov-19-09  zanshin: <jst102: can somebody explain to me why white never takes black's rook???>

Probably because the move played is slightly better. (Rybka 3 on just <25.bxa5> and <25.Nxg5>):


click for larger view

[-5.08] d=16 25.bxa5 Rg2 26.Kb1 bxa5 27.Ne1 Rg6 28.Kc2 Kd7 29.Ra1 Ra8 30.Nd3 h6 31.Ra3 Qg7 32.Rh3 Rg2 33.Kc3 a4 34.Nb4 (0:34.16) 302371kN

[-5.28] d=15 25.Nxg5 Qxg5 (0:18.14) 168502kN

Nov-19-09  hedgeh0g: Too easy for a Thursday.
Nov-19-09  5hrsolver: Good one JG27Pyth. I felt the same way about white's position. I like the Knight 'reloader' term.
Nov-19-09
Premium Chessgames Member
  beenthere240: It looks like white played 37. Kb2 to avoid the risk of a draw by repetition!
Nov-19-09  Patriot: <<jst102>: can somebody explain to me why white never takes black's rook???>

It breaks the principle of trading material when your down, which simplifies the game for the other player. If you're on the losing end it's usually a good idea to retain your pieces as long as you can until your opponent gives you a chance to get back into the game (hopefully).

<zanshin>'s Rybka analysis shows there is only a 0.2 difference between the two top lines, Nxg5 and bxa5, so it turns out that Nxg5 is ok. I can't calculate 0.2 differences during games and don't try to, so in this case I would certainly consider Nxg5 realizing that I am trading in a lost position and would strongly consider bxa5 instead.

Nov-19-09
Premium Chessgames Member
  patzer2: For today's Thursday puzzle solution, Black's 15...Nb3+! exploits White's weak Queenside castled position and the helplessly surrounded King.

After 15...Nb3+! 16. axb3 Nc5 , White is forced to surrender the Queen to avoid mate which leaves Black with a clearly decisive advantage. In that sense, 15...Nb3+!, with the dual threat of mate or winning the Queen, could be classified as either a trapped Queen, helpless King or weakend castled position combination.

Nov-19-09
Premium Chessgames Member
  beenthere240: 29. b7+ Kb8 30 Rhb1 threatens mate, but after ...Rxd3, no matter how black playws, white can chase black's king onto the b file, ending the mate threat since the b pawn is cut off and probably swapping off another rook, leaving white with a R vs Q ending (and a huge pawn deficit.
Nov-19-09  MindBoggle: Patzer2 writes:

<In that sense, 15...Nb3+!, with the dual threat of mate or winning the Queen, could be classified as either a trapped Queen, helpless King or weakend castled position combination.>

The queen is not trapped, neither is the king helpless. You write yourself that the move carries a dual threat, so why not classify it as simply a double attack?

This is a typical thursday puzzle: a flashy one-mover. But a very easy one. With the bishop on f5, Nb3+ and Nc5 with a deadly double attack suggests itself.

Nov-19-09
Premium Chessgames Member
  kevin86: I had the moves,but didn't realize how strong they were.

The point is that black not only threatens a queen fork-but mate as well. So the queen to escape was taboo-and the sacrifice must prevail.

Nov-19-09  Patriot: <<beenthere240>: It looks like white played 37. Kb2 to avoid the risk of a draw by repetition!>

You're right it looks that way. I think black was trying to reach the time control, so if 37.Kc2 (going for a draw) then black can deviate with 37...d5.

The fact that black didn't play 35...d5 right away seems a good indication that black was low on time.

Nov-19-09
Premium Chessgames Member
  chrisowen: Nb3+ muzzles white where he can reload it via Nc5+ winning the queen. A nugget of wisdom is dont go backward when you castle. He falls into the fire, arming the rook but neglects his king saftey. Catch the queen offside with Nb5 instead of triggering the sac. 0-0-0 is a shot in the dark not realising what happens next.
Nov-19-09
Premium Chessgames Member
  beenthere240: <Patriot> I think you're right about the time scramble. 35....Rg4 is also a killer.
Nov-19-09  YouRang: Got it pretty rapidly. I learned some time ago to look first at the position of the opposing king. In this case, the king is immobilized, which means that any check can be mate. I also noticed that my knight on c5 is within checking range of the king, so I figured I was "on to" the solution.

The knight would mate on b3 except that b3 is guarded by Pa2. Can I get rid of that pawn? I mulled this over for a moment, and finally realized that the only way to displace that pawn was to spend my knight itself: <15...Nb3+ 16.axb3>.

But this idea has merit because I can replace the spent knight with the other knight <16...Nc5!>, once again threatening mate at b3.

White has one tempo to do something about it (which is the point that makes this puzzle somewhat challenging). But it appears that the only defense requires white to drop his queen. So 15...Nb3+! it is. :-)

Nov-19-09  eblunt: Got this one fairly easily, but I'm not so sure OTB. Under those sorts of pressures it seems to me easier to evaluate a move with a directly forcing follow up. At first glance here, the Knight reload isn't a directly forcing move, and seeing that white is helpless even with a tempo would certainly be much harder under match conditions.
Nov-19-09
Premium Chessgames Member
  doubledrooks: White gets a nasty surprise with 15...Nb3+ 16. axb3 Nc5, and must give up her highness for two minor pieces.
Nov-19-09  GreenFacedPatzer: Got it!
Rare for me on a Thursday. I found it by greedypatzerthink: Gee, I wish I could play Nb3+ and win his queen! He'll take my knight, but hey, I've got another knight ready to jump into the action... yes that works, but he's got one move to get himself out of trouble. Oh, wow, I'm threatening checkmate, so no matter what he does, things are going to go badly for white---he can save his king or his queen, but not both of them.
Nov-19-09  sfm: <jst102: can somebody explain to me why white never takes black's rook???>

<zanshin: Probably because the move played is slightly better. (Rybka 3 on just <25.bxa5> and <25.Nxg5>)

OK, but I was actually thinking of 35.NxR (or 37.NxR)

Nov-19-09
Premium Chessgames Member
  patzer2: <MindBoggle> Thanks for the suggestion of double attack as a possible classification of the main tactic in today's puzzle. Based on the definition of double attack as a move that "threatens two things at once" at http://www.angelfire.com/games5/che... you have a point.

However, my understanding of the situation is that 15...Nb3+ 16. axb3 Nc5 actually makes a single crusing threat with 17...Nb3# which forces the loss of the White Queen to avoid mate. So in that sense the Queen is trapped.

Yet if White selects to avoid the mate with say 17. Rde1, then 17...Nb3+ is a winning Knight Fork which is a kind of double attack.

In classifying the combinations, I mainly consider which category will help me understand and master the tactic. In this case, the feature of the position that enabled me to solve today's puzzle was the awful Queenside castled position with the resulting shaky position of White's King and Queen. So I put it in my "weakened castled position" collection.

However, if "double attack" works for someone else in trying to understand and master the tactic then that's fine by me.

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