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Renato Naranja vs Lajos Portisch
Siegen (1970), Siegen FRG, Sep-??
Gruenfeld Defense: Exchange. Classical Variation (D86)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Sep-06-16  kulitbulilit: Nice to see a gem of a game by a Filipino player of long ago, against the great Hungarian master Portisch.
Sep-06-16
Premium Chessgames Member
  patzer2: It's Tuesday and 16...Qb4+ solves our puzzle by overworking the Black Queen as 17. Qxb4 Nxd3+ 18. Kd2 Nxb4 (-3.54 @ 27 depth, Stockfish 7) wins decisive material with a knight fork.

If 17. Kf1, then 17...Qxb3 18. axb3 Nxd3 19. Rd1 Ne5 (-3.67 @ 20 Depth, Deep Fritz 15) removes the Queen's guard and wins the Bishop using the deflection tactic.

If 17. Qc3, then 17...Nxd3+ 18. Kd2 Bxc3+ (-14.65 @ 18 depth, Deep Fritz 15) wins the White Queen utilizing the pin and discovered attack with check tactics.

White's decisive mistake was 15. f3? allowing the winning deflection 15...b5! (-3.11 @ 28 depth, Komodo 9.42). If 16. Bxb5, then 16. Bxb5 Bxb5 17. Qxb5 Rab8 18. Qa4 Nd3+ 19. Kd2 Nxc1 wins the exchange with decisive advantage.

Instead of 15. f3?, White should play 15. Bb5 = to (-0.22 @ 28 depth, Komodo 9.42) to keep it about level.

Earlier, instead of the weakening 13. d5?! Ne5 (-0.36 @ 21 depth, Deep Fritz 15), White should maintain the tension with 13. Qb3 e6 14. e5 = to (+0.27 @ 21 depth, Deep Fritz 15).

Sep-06-16
Premium Chessgames Member
  patzer2: <Once> My grandson's refer to PPP as putting pressure on the pinned piece. I think they got it from a chesskid.com online video.
Sep-06-16  mel gibson: Easy today - black gains a bishop in the swap.
Sep-06-16
Premium Chessgames Member
  thegoodanarchist: <White's decisive mistake was 15. f3?>

10.h4 is not so good either, IMO. Too many pawn moves in the opening, and no time taken to ensure king safety.

White got his just due.

Sep-06-16
Premium Chessgames Member
  catlover: Material is even. If 16Qb4+, 17. QxQ results in a Knight fork: 17Nxd3+ regaining the Queen and leaving black a piece better.

Only thing is, white doesnt have to take the queen. So what happens if he doesnt take it? If he blocks the check with 17. Rc3 or 17.Nc3, then black still plays 17Nxd3+ and is a piece up (the rook would be pinned).

But what if the king just moved? If 17. Kf1 or Kd1, then 17QxQ and after 18. A2xQ Nxd3 and black is still a piece up.

I'll check and see if I'm missing anything...

****

Nope. 2 for 2 this week.

Sep-06-16
Premium Chessgames Member
  catlover: It was an easy puzzle today (which is why I got it).

Imagine finding an overworked piece the day after Labor Day!

Sep-06-16
Premium Chessgames Member
  Bubo bubo: Since the white queen has to protect the Bd3, Black can win a piece by decoy and a fork: 16...Qb4+ 17.Qxb4 Nxd3+ and 18...Nxb4. White can avoid the decoy by playing 17.Kf1, but loses the piece anyhow, now by removal of the guard: 17...Qxb3 18.axb3 Nxd3.
Sep-06-16
Premium Chessgames Member
  laskereshevsky: ...Qb4+

Of course for tournaments players from 1800-1900 elo points its like to find a mate in 1 or 2 moves

Sep-06-16
Premium Chessgames Member
  laskereshevsky: ....if the E2 square was not occupied by th N the move Ke2 keep everything :-)
Sep-06-16
Premium Chessgames Member
  PawnSac: ..Qb4+ deflection and fork.
Nothing works for white. He loses a piece.

17.Qxb4 Nd3+
17.Kf1 Qxb3 and Nd3
17.Rc3 Nd3+ and Bxc3
17.Qc3 Nd3+ and Bxc3

Sep-06-16  LIzzard: Having lost the bishop and abiity to castle, would anyone here advocate continuing to play? Be curious if there's an argumet to do so....
Sep-06-16
Premium Chessgames Member
  varishnakov: <LIzzard>

If your opponent is a low-rated player, I would advocate continuing. He could blunder a piece right back. Though personally I would find it difficult to continue such a lost position.

Sep-06-16  YouRang: Tuesday: 16...?


click for larger view

A little tougher that the average Tuesday IMO. Once again, the key hint is that we (black) have a knight in checking range of the king. That means it's time to look for forking chances.

Our Ne5 can give check at d3 or f3, but the bishop at d3, guarded only by the queen seems to be the most promising target. From d3, the knight can fork several other squares, but the most interesting seems to be b4, because b4 is attacked by our Q, our Q can give check from there, and it also attacks white's Q (which is defending that bishop at d3). Another point to raise is that moving the Ne5 also opens the diagonal for our DSB.

After a moment of contemplating these clues, it all comes together with <16...Qb4+!>


click for larger view

- If 17.Qxb3, then our 17...Nxd3+ fork wins back the Q plus the bishop.

- If 17.Qc3, then still 17...Nxd3+!, because it exposes the bishop attack on the queen, winning both Q+B. (This was the wrinkle that made this puzzle a bit tricky.)

- If 17.Rc3, then 17...Nxd3+ and the ...Bxc3 still wins.

- Move the king out of check results in 17...Qxb3 (removal the guard) 18.axb3 Nxd3, and black still goes up a bishop.

Sep-06-16
Premium Chessgames Member
  kevin86: The agility of the queen and knight enable black to win quickly.
Sep-06-16  BOSTER: It'll be more interesting if puzzle began with black to play 15...
Sep-06-16  King Harvest: <<LIzzard>: Having lost the bishop and abiity to castle, would anyone here advocate continuing to play? Be curious if there's an argument to do so....>

I don't think there's any argument for prolonging the game down a piece against a player of Portisch's caliber.

But does black have some problems left to solve? Well, yeah... when I tried to win from the final position against an engine -- the damn thing gave me fits. So, if it's a question of playing on between a +3000 elo player vs. a scrub, then sure, there's a little life left in White!

Play might continue -- 17.Qxb4 Nxd3+ 18.Kd2 Nxb4 19.a3 Na6 ...

The black N ends up miserably positioned on a6 -- from here Black has to patiently reorganize to find a way to bring the N back into the game and make the extra piece count for something. It's shocking how awkward the N on a6 is and how difficult the engine/white can make it to bring back into play. Engine v engine there's no difficulty at all, but engine vs. me... ehh, we hit a few snags.

Sep-06-16  Willber G: <BOSTER: It'll be more interesting if puzzle began with black to play 15...>

Doesn't 15...b5 16.Bxb5 win a pawn for white?

Sep-06-16  YouRang: <Willber G: <BOSTER: It'll be more interesting if puzzle began with black to play 15...>

Doesn't 15...b5 16.Bxb5 win a pawn for white?>

It's a fairly complex line, but after 16...Bxb5 17.Qxb5, black has 17...Rab8!


click for larger view

White can't move his queen such that it prevents ...Nd3+, forking K and rook.

Sep-06-16
Premium Chessgames Member
  jith1207: Roype for-a Royal for-k.
Sep-06-16
Premium Chessgames Member
  sfm: <King Harvest: ... Engine v engine there's no difficulty at all, but engine vs. me... ehh, we hit a few snags.>

LOL! Yeah, I have tried that many times too.

Sep-06-16  Willber G: <YouRang: <Willber G: <BOSTER: It'll be more interesting if puzzle began with black to play 15...>

Doesn't 15...b5 16.Bxb5 win a pawn for white?>

It's a fairly complex line, but after 16...Bxb5 17.Qxb5, black has 17...Rab8!

White can't move his queen such that it prevents ...Nd3+, forking K and rook.>

Thanks. I worked it through to your position but for some reason had it in mind that Qa4 covered Ne3 - obviously it doesn't!

Sep-06-16  zb2cr: 16. ... Qb4+ is obvious. If White takes, 17. ... Nxd3+ wins a piece.

White has other moves to get out of check, though.

17. Nc3 or 17. Rc3 both leave the piece on c3 pinned, and blocking the Queen's defense of it. So, for both of those moves, 17. ... Nxd3+ wins a piece.

King moves such as 17. Kf1 still lose a piece to 17. ... Qxb3 followed by snatching the suddenly loose Bishop at d3. And the same sequence works if 17. Bd2.

So, the conclusion is that White loses a full Bishop.

Sep-06-16  The Kings Domain: Good puzzle, nice winning move.
Sep-07-16  MostlyWatch: While y'all are contemplatin' your chess novels in progress, consider the scenario of a spy who gets instructions from his home office via daily jibberish in the chess forum
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