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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 1 OF 2 ·  Later Kibitzing>
Dec-24-13
Premium Chessgames Member
  Phony Benoni: As much as we would like to regift that pawn on h4, we're stuck with it. But there are some interesxting bishop moves.

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.

So maybe 28.Bxh8, similar ideas? 28...Rxg4 29.Qxg4 Kxg8 ... no, the check on h5 goes nowhere.

So, Keep It Simple, Santa. <28.Rg6> threatens mate on h6. If either rook takes on g7 White has too much firefpower on the sqaure. if 28...Nxg6 29.Qxg6#. And 28...Kre8 29.Rh6+ Kg8 30.Rxh8# does the job.

Dec-24-13  Herma48852: Not as easy as the normal Monday puzzle but here a quiet move does the trick with 28. Rg6 .. very nasty indeed.
Dec-24-13  Doniez: The inflated situation around the black King and the h pawn that blocks the h file seem to suggest to gain a tempo. 28.Rg6 is good enough and allows mate in 2. I found this puzzle not as easy as previous Tuesday's were.
Dec-24-13  Patriot: 28.Rg6 threatening 29.Rh6#

28...Nxg6 29.Qxg6+ Kh8 30.Qh6#

28...Rfxg7 29.Rxg7+ Kh6 30.Qd2#

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

Dec-24-13  Patriot: Hmm...in my first line, 29...Kh8 is illegal so 29.Qxg6 is mate.
Dec-24-13  dunamisvpm: I have seen the solution 28.Rg6 within a glance! Merry Christmas!
Dec-24-13  Cheapo by the Dozen: (Edit: Yeah, Rg6 may be even better than the line I suggest below.)

I'm missing what's hard about this.

White starts out 2 pawns up.

28 Bxh8 wins more material unless Black recaptures; it also puts Black's rook en prise. Absent some tactical opportunity I'm overlooking, Black only has two tries in response: 28 ... Rxh8 and 28 ... Rxg4. The latter fails to 29 Qxg4 and 30 Qxh5+, which quickly leads to mate.

But
28 Bxh8 Rxh8
29 Rg7+ Kh6
20 Qd2++ mates as well.

Dec-24-13
Premium Chessgames Member
  FSR: 28.Rg6 and crunch.
Dec-24-13
Premium Chessgames Member
  FSR: <Cheapo by the Dozen> On 28.Bxh8, Black plays 28...Rxg4! 29.Qxg4 Kxh8!, when he can meet 30.Qh5+ with 30...Rh7.
Dec-24-13
Premium Chessgames Member
  agb2002: White has the bishop pair and two pawns for two knights.

White has a number of options: 28.Bxf6, 28.Bf8, 28.Bh6, 28.Bxh8 and 28.Rg6.

I. 28.Bxf6 Rxg4 (28... Qxf6 29.Rxg8 Qxh4+ 30.Qh2 + - [R+B+2P vs 2N]) 29.Bxd8 Rxg2 30.Rxg2 + - [2B+3P vs 2N].

II. 28.Bf8 Rxg4 29.Qxg4 Qxf8 30.Qh5+ Qh6 and Black seems to hold.

III. 28.Bxh8 Rxg4 (28... Kxh8 29.Rxg8+ and mate next; 28... Rxg8 29.Rg7+ and mate next) 29.Qxg4 Kxh8 30.Qh5+ Rh7 31.Qg4 Nxc4 and only Black has made progress.

IV. 28.Bh6 Rxg4 29.Qxg4 Re7 (29... Kxh6 30.Qh5#; 29... Nxc4 30.Qh5 wins) 30.Qh5 Qe8 unclear.

V. 28.Rg6 Rgxg7 (28... Nxg6 29.Qxg6#; 28... Rfxg7 29.Rxg7+ as in the main line) 29.Rxg7+ Kh6 (29... Rxg7 30.Qxg7#) 30.Qd2# (30.Qg6+ Nxg6 31.R1xg6# is one move longer).

I'd play 28.Rg6.

Dec-24-13  Cheapo by the Dozen: <FSR> Thanks -- you're right. Too much material will have been exchanged off for White to bust through quickly.
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
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