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Lajos Portisch vs Lubomir Kavalek
Amsterdam IBM (1981), Amsterdam NED, rd 4, May-19
English Opening: King's English. Two Knights' Variation Smyslov System (A22)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Dec-24-13  Nick46: got it
Dec-24-13  cyclon: 28. Rg6.
Dec-24-13  goodevans: <Herma48852: Not as easy as the normal Monday puzzle...>

It's Tuesday!

But a valid point, nonetheless. Both yesterday's and today's puzzles have been more complicated than the usual early week fare. Is this a sign of things to come?

Dec-24-13  gofer: Is there really only one winning move in this position? It looks like quite a few moves win! But the bishop is a red-herring...

Bxh6/Bf8/Bh6 Rxg4 is okay for black and Bxh8 is rather a long route to victory...

28 Bxh8 Rxg4
29 Qxg4 Kxh8
30 e5 dxe5
31 dxe5 fxe5
32 Qg6 Qf8
33 Bh5 Rh7
34 f6 Nd7
35 f7 Qg7
36 Qxg7+ Rxg7
37 Bg6 Nf8
38 h5

...so lets try the rook.

<28 Rg6 ...>

28 ... Nxg6
29 Qxg6+#

28 ... Rgf8/Re8
29 Rh6+ Kg8
30 Rxh8#

28 ... Rfxg7
29 Rxg7+ Kh6
30 Qg4

<28 ... Rgxg7>
<29 Rxg7+ Kh6>
<30 Qg4> mating

Dec-24-13  gofer: For instance...

28 h5 ...

followed by

29 h6 ...

seems to be winning for white too...

Dec-24-13  morfishine: <28.Rg6> threatens 29.Rh6#

(1) 28...Nxg6 29.Qxg6#

(2) 28...Rxg7 29.Rxg7+ forces mate

*****
What I find fascinating is how GM's get themselves in positions like this. White's final 3 moves are so forcing and conclusive, one can only grin, except Black that is...

*****

Dec-24-13  awfulhangover: <<Phony Benony>28.Bxf6 is a nice double attack, but after 28...Rxg4 29.Qxg4 Qxf6 30.Qh5+ Qh6, we note to our horror that the rook on f7 is protected by the knight.>

Play 30.Qg8+ and you win

I went for 1.Bxf6, and it wins fast and easily. Houdini confirmed it.

But 30.Rg6 faster and more elegant

Dec-24-13  RandomVisitor: The following moves win: Rg6, c5, a4, Qg3, a3, d5, e5, Be2, Bd1, Bh6, Kh2, h5, Rg3, Bxf6, Bxh8.

So if you got one of those 15 moves, you are right.

Dec-24-13  Refused: 1.Rg6 and the lights go out.
either 1...Rxg7 2.Rxg7+ Kh6 3.Qg6+ Nxg6 4.R1xg6#
1...Nxg6 2.Qxg6#
or any other move 2.Rh6#

put a quick end to Black's misery.

Dec-24-13  zb2cr: 28. Rg6 gets the party started.
Dec-24-13
Premium Chessgames Member
  Penguincw: Interesting puzzle: White has no moves that gives check (right away). 2/2 this week.
Dec-24-13  Patriot: Take a look at this position:


click for larger view

White played the very curious, 17.g4. I wondered what the benefit is. It strengthens f5 for the knight, but it also "undefends" the white knight and with the black queen x-raying through to that piece, white must have considered this very carefully. I wondered what would happen if 17...Ngxe4?


click for larger view

One possibility I calculated was 18.dxe4 Qxh4 19.g5 Qxg5 20.Rxf7 with more to follow. Houdini suggested 18.dxe4 Qxh4 19.Bxc5 (of course!) dxc5 20.Qxd7 winning.

But that didn't happen. 17...g6 creates a weak square on f6 so that 18.Rf6 becomes possible already creating the possibility of a sacrifice on g6. This gives white a lot of flexibility, while black's pieces lack coordination. Instead, 17...Qd8 18.Nf5 Bxf5 19.gxf5!

How many of us would have played 19.Rxf5 here:


click for larger view

19.gxf5 seems anti-positional in the sense the pawn now blocks the rook battery. But white's plan is to shift everything to the g-file, to generate a ton of pressure against g7. White does this with 19...f6 20.Rg4. You also must notice the g5-knight's post is a weak one because it can be driven away with h4.

White's plan, starting with 17.g4 is a very masterful one.

Dec-24-13
Premium Chessgames Member
  Jimfromprovidence: I liked this mate with an extra move.

28 Rg6 Rfxg7 29 Rxg7+ Kh6 30 Qg6+!? (missing 30 Qd2#) Nxg6 31 R1xg6#.


click for larger view

Happy Holidays to all!

Dec-24-13  actinia: mm, I got knocked out this week on Tuesday. bah humbug
Dec-24-13
Premium Chessgames Member
  paulalbert: Got this one correct after calculating the variations and rejecting the other initial knee jerk tries like Bxf6. This is perhaps a little more subtle than the usual Tuesday puzzles. At least today I had a little time to look at the position seriously. Let's see what Christmas tomorrow looks like. Merry Christmas everyone.
Dec-24-13  master of defence: Can someone explain me what happens after 26...Kxh6? I didn't found a win for white there.
Dec-24-13  Shams: <m.o.d.> 26...Kxh6 27.Rg6+ Kh7 28.Qg4 1-0
Dec-24-13  BOSTER: What if black played 24...Nfe5 not Nh8?
Dec-24-13  Amadori: <Shams> <26...Kxh6 27.Rg6+ Kh7 28.Qg4...> and ...Nf7 29.Qh5+ Nh6?
Dec-24-13  Shams: <Amadori> 28....Nf7 29.Rxg7+ and mate is coming.
Dec-24-13  nariga: <Patriot> I thought white played 17.g4 to prevent 17...Nh3 (or Bh3) which would perhaps help black to exchange some pieces and relieve the whole pressure on f/g columns. But waht I am not clear is why black played 26...Nb6.
Dec-24-13  Patriot: <nariga> I think 15.Kh1 was played to avoid 15...Nh3+ forcing the trade of the bishop pair. You may have hit on another reason he played 17.g4 though because 17...Nh3 looks troublesome. I'm wondering though if 18.Bxh3 Bxh3 19.g4 traps the bishop? I think 26...Nb6 is pure desperation, attacking c4, because after 26.Bxh6 black is doomed.
Dec-24-13  Patriot: <nariga> Nevermind. 19.g4 Bxf1 - I must be tired!
Dec-24-13  Abdel Irada: <goodevans: <Herma48852: Not as easy as the normal Monday puzzle...>

It's Tuesday!

But a valid point, nonetheless. Both yesterday's and today's puzzles have been more complicated than the usual early week fare. Is this a sign of things to come?>

Probably not. Experience suggests that it's no more than a random fluctuation.

Dec-26-13
Premium Chessgames Member
  kevin86: Nice finish: first step Rg6!
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