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Nicolas Rossolimo vs Cenek Kottnauer
Bad Gastein (1948), Bad Gastein AUT, rd 10
Sicilian Defense: Nezhmetdinov-Rossolimo Attack (B30)  ·  1-0
Move:
Last:

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Given 68 times; par: 15 [what's this?]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Aug-29-12
Premium Chessgames Member
  Once: Update: After 40 minutes on infinite analysis, the scores on the doors are ...

Nxc6 =0.00
Nc4 =-0.01

One hundredth of a prawn!

Naturally, the pedants will point out that the science of small numbers produces unexpected effects. The real difference could be anywhere between a miniscule amount over absolute equality and a miniscule amount under two hundredths of a prawn.

Aug-29-12
Premium Chessgames Member
  Gypsy: I love the tactics in this puzzle:
Traps are an art-form of practical-chess and this particular ambush is about as perfectly set up as one ever comes across.

For one, <9.Nxc6!> looks like such a straight forward swap of knights that no warning flags are raised.

For two, <10.Qxd5!!> in a practical game is a stunner.

For three, the cross pin of <Pc6> and supporting pin of <Pe6> are just plain beautiful.

And for four, the cool defense <9...O-O!> is a hidden gem of a move that depends on the fact that the <Nc6> has no escape and its re-capture can be postponed.

Aug-29-12  ZZpatzer: <Gypsy: I love the tactics in this puzzle: > I agree. Even though there is no win for white, the game and tactics are instructive. BTW, Shredder gives 9...0-0 10.Nxa7 for white and calls it even...
Aug-29-12
Premium Chessgames Member
  whiteshark: I always say; you can never know enough basics.
Aug-29-12
Premium Chessgames Member
  Tiggler: <Once> <After 9...d4 10. 0-0...

... we have a position where the white Ne5 is attacked three times, but defended only twice <and> where the d pawn is attacked twice and not defended at all. White can't defend both. So I'm afraid that 9. d4 is a tactical mistake.>

While I won't attempt to argue with your fried Fritzie, your human explanation is flawed, because one of the attacks on the d pawn comes from the N on c6, which is also one of the three pieces attacking Ne5. After 10. Bxc6 black has to recapture on c6. If 10... bxc6 11. c3 and white has in fact defended both d4 and Ne5.

There are undoubtedly still challenges in the position, but the problem you mention is not on of them

Aug-29-12
Premium Chessgames Member
  Tiggler: <Once> I meant to say "friend Fritzie", not <fried Fritzie>. Perhaps after your infinite analysis, however, he might be lightly sauteed.
Aug-29-12
Premium Chessgames Member
  Once: Let's take a look at your new line: 9. d4 0-0 10. Bxc6 bxc6 11. c3


click for larger view

Several ways for black to win a pawn from here. Perhaps the simplest is 11...cxd4 12. cxd4 f6 targetting the h2 pawn. Black's weak d4 pawn and e5 knight (and the weak h2 pawn behind it) simply cannot be held.

Aug-29-12
Premium Chessgames Member
  Tiggler: <Once: Let's take a look at your new line>

Not a new line at all: it is the line I originally proposed. You, however, have a new explanation and a different pawn that <simply cannot be held>.

The d4 pawn is not weak, or at least no weaker than black's c and e-pawns in the line you mention. Black can spend a tempo capturing h2, perhaps. It costs a tempo because after Kh1, the bishop will have to move away again. The same is true after 9. Nc4, however.

I agree that W is probably worse, and I would not try to defend it against Fritzie or Stockfish. Against a human player rated under 2400, however, I would feel moderately comfortable.

Aug-29-12
Premium Chessgames Member
  PinnedPiece: Using my new plan of just "playing the puzzle side" for each move up to and including whatever the supposed puzzle move is:

I'm Happy to report I spotted the possibilites of the cross pins at move 7 and was surprised to see black play right into them. 9.NxN on c6 was a no-brainer. Black had several other moves available to avoid this combination---quite instructive for me who would likely be making those same black side moves (and have done!).

.

Aug-29-12
Premium Chessgames Member
  Tiggler: <LoveThatJoker> <Well, let me put it to you this way: until you can produce middlegame analysis that is stronger ELO-wise than 3127, I for one am going to trust Stockfish on objective middlegame assessments.>

An engine that is rated 3127 does not usually play up to that level in "positional" middlegames. Engines earn their rating by being flawless in tactical positions and endgames. They do not always take proper account of structural advantages that prove decisive when the endgame is reached, because of their limited horizon. If a 2700 GM had their computational ability, then he/she would be stronger than 3100, I think.

Aug-29-12
Premium Chessgames Member
  Once: <Tiggler> Okay, if you'd like a line that highlights the weakness of d4 and the Ne5, try this one:

9. d4 0-0 10. Bxc6 bxc6 11. c3 cxd4 12. cxd4 c5


click for larger view

Not as strong as f6, but it still works. White is going to struggle to defend both d4 and the Ne5. Black can add to the pressure with moves like Bb7 and f6. White has many different tries against this, but I can't find one that doesn't go a pawn down. Can you?

In short, there are lots of ways to win against 9. d4 - some riff against the weakness of d4 and the Ne5, others against h2. Either way, white is struggling.

By contrast, after 9. Nc4 Bxh2+ 10. Kh1


click for larger view

White is now threatening to win a piece with Qxd5 so black doesn't have time to retreat his Bh2. And if 10...0-0 11. Bxc6 bxc6 12. g3


click for larger view

That's why 9. Nc4 is much stronger than 9. d4.

Aug-29-12  gofer: <Abdel Irada >'s puzzle: Black to move...


click for larger view

<Crafty EGT> colours reversed

http://www.chessvideos.tv/endgame-t...

I think the key point is to move Bd6, but there are lots of alternatives, because white is in such a poor position!

<Bb8>, <Bc7> and <Be5> all work well (mate in 4) because they don't allow g4 as a reply.

However, <Bf4> is still mate in 4, but with a slightly different solution.

Even <Bc5> is mate in 5 and it would get <Once's> vote due to the blood-thirsty way the bishop takes a pawn, rook and knight with its 4 moves! Before letting the queen do the thing...

Aug-29-12
Premium Chessgames Member
  Tiggler: <Once> Seems as though you have accepted my challenge to play this out!


click for larger view

My move is 13.Nc3

Aug-29-12  Crispy Seagull: I did choose knight takes, and did see the potential for the double pinned pawns and pressure on the king, but not to the full extent of being up a piece for a pawn. Can't say I would have resigned if I was black however. Even if he traded bishops after the ending position, black seems to me to have some development and central control for being down two pawns, plus a castle that's superior to white's.
Aug-29-12  James D Flynn: Material is equal but White lags in development, however, he has threats against Blacks K with his 3 developed pieces.. Candidates d4, Qxd5, Nxc6,Nxf7,Ng6,Ng4. 9.d4 Bxe5 10.dxe5 O-O 11.Qg3 Ne7 12,Bd3 Nd4 13,Nd2 White has 2 bishops, he has now completed his development and has some pressure against the Black K-side. The chances are approximately equal. 9.Qxd5 exd5 10.Nxg6+(if Nxc6+ Kf8 and White’s attack has run its course and Black should win)Kd8 11.Nxh8 Be6 12.Nc3 Kd7 and the N on h8 falls, Black wins. 9.Nxc6 bxc6 10,Qxd5 Bb7(or Bd7 11.Qf3 O-O 12.Ba4 and White is a piece up) 11.O-O Qf3 again White is a piece up. 9.Nxf7 Rf8(if Qxf7 10.Bxc6+ bxc6 11.Qxc6+ Qd7 `12.Qxa8 and White has won the exchange and 2 pawns)10.Nxd6+ Qxd6 11.Qh5+ 12 Kd8(or g6) Qxh7 and White has won 2 pawns and stranded Blacks K in the center. 9.Ng6 hxg6 10.Qxd5 Bxh2+ 11.Kf1(not Kh1 Be5+ 12.Kg1 exd5) Bd7 Black has won a pawn, he will castle Q-side and will have attacking chances against Whites K, 9.Ng4 O-O 10.c3 e5 and Black has a mobile central pawn mass and is clearly better, Now for the game.
Aug-29-12  nariga: I am wondering if 12.Qh5 Qf4 has any redeeming possibilities for black. Black is a piece down, but if he can get the f pawn, and attack the white's e-rook, un-double his pawns on c-column, and expose white king... Whites' three pieces are undeveloped- can blak take advantage of that??
Aug-30-12  nariga: or 12.Qh5 Bg3?
Aug-30-12
Premium Chessgames Member
  Abdel Irada: <To all who examined my puzzle>:

There are actually several possible solutions, all of them involving moving the bishop on d6 as a clearance sacrifice. In the actual game, I chose <25. ...♗xb4>, but as noted by several solvers, other moves also work.

The finish was:

25. ...♗xb4!;
26. cxb4

Only marginally better is 26. g4, when Black simply retreats the bishop to d6, and there are too many attacks on h2 for White to hold them all off.

26. ...♕xh2†!;
27. ♘xh2 ▢, ♖xh2†!;
28. ♔xh2 ▢, ♖h6#.

Aug-30-12
Premium Chessgames Member
  Abdel Irada: <Tiggler>: <...My move is 13.Nc3>

I have been following your conversation with <Once>, and in that position, 13. ♘c3 was also my first thought. But it seems to offer the advantage to Black after 13. ...♗b7, when the knight on d5 is fortified, Black has developed aggressively, and potential threats on the long diagonal begin to make the queen uncomfortable on f3 ... all while leaving White's weaknesses on e5 and d4 unrelieved.

I'm afraid I have to consider 9. d4?! a risky and probably losing move. The text (9. ♘xc6) and 9. ♘c4 look like the only paths to equality, with the former having the advantage of being somewhat more forcing.

On the whole, however, this remains a rather unsatisfying puzzle. The only joy I got from it lay in how powerfully 9. ...o-o defeated all of White's tactical hopes. To look at the position, one would think that Black hasn't done anything wrong, so it would seem unjust if White did have a forced win.

Aug-30-12
Premium Chessgames Member
  Tiggler: <Abdel Irada> Pleased to have you take over from <Once>, since he seems to have gone quiet.

13. ... Bb7
14. Nb5

Aug-30-12
Premium Chessgames Member
  Once: <Tiggler> I watched the paralympic opening ceremony then went to bed!

13...Bb7 14. Nb5 Qa5


click for larger view

... forking the knight on b5 and the rook on e1 (and also threatening mate in 1).

White's best from here is probably 15. Nc3 when 15...cxd4 snaffles the aforementioned weak d4 pawn.

Aug-30-12
Premium Chessgames Member
  Tiggler: <Abdel Irada> and <Once>

At this point, having neutralized black's threats, without losing a <prawn> and with exchanges impending, white is comfortable in offering a draw.

Aug-30-12
Premium Chessgames Member
  Tiggler: <Once> Ouch! I wish you had stayed in bed. Let me think about it for a moment before I resign. Looks like Nc3 might be playable...
Aug-30-12
Premium Chessgames Member
  Once: And black, a clear pawn ahead, says "no thank you".
Aug-30-12
Premium Chessgames Member
  Tiggler: <Once: And black, a clear pawn ahead, says "no thank you".>

Yes, you made your point.

As you say 15. Nc3 cxd4
16. Nc4 and Black will probably be able to hang on to the extra pawn, I guess.

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