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Alberto Miatello vs Gabriel Gaehwiler
Biel MTO (2010), Biel, Switzerland, rd 2, Jul-20
Sicilian Defense: Fischer-Sozin Attack. Flank Variation (B87)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 3 ·  Later Kibitzing>
Oct-13-10  Nova: 20. Rxe6! Is a fantastic move. This would be a nice tuesday or wednesday puzzle. I wonder though if this is all just theory or brilliant play by white.
Oct-29-10  fgh: Haha, I found this quite easy. Nice puzzle anyway.
Oct-29-10
Premium Chessgames Member
  OBIT: OK, I got this one on the second go 'round. The first time I looked at 20. Rxe6+ Qxe6 I didn't see the follow-up, but the second time I looked at 20. Rxe6+ Qxe6 I noticed 21. Qg7+!:

21...Qf7+ 22. Re1+ wins the queen.

21...Ke8 22. Qxh8+ picks off both rooks.

21...Kd8 22. Qxh8+ Qe8 23. Qxf6+ looks good.

Oct-29-10
Premium Chessgames Member
  dzechiel: White to move (20?). Material even. "Difficult."

I noticed yesterday that <BOSTER> wondered about the counting of material when evaluating a position, and this is a fair question. If this was a composed mate-in-two or mate-in-three, the material balance on the board would not be relevant.

However, these positions we are asked to examine are from actual games, not compositions. The solution may be to emerge two pawns up with a won endgame, not necessarily a quick checkmate. With this in mind, we need to acquire for ourselves all of the information that the players of the game had on hand, and part of that is the material balance, as that could very well affect our strategy.

OK, back to today's position. Right away I want to play

20 Rxe6+

If black tries to take the rook with

20...Qxe6

then

21 Qg7+ Kd8

On 21...Qf7 22 Re1+ picks up the black queen.

22 Qxh8+ Qe8

Any other move, such as 22...Kc7 allows 23 Qxa8 snagging both black rooks.

23 Rxd6+ Kc7 24 Qxf6

leaving white up three pawns (24...Qe1+ is parried with 25 Rd1).

So, what happens if black declines the initial rook sac? After...

20 Rxe6+ Kf7

Or 20...Kd8 21 Rdxd6+ looks very strong.

21 Rxf6+ Kxf6 22 Rxd6+ Kf7

Or 22...Ke7, it works out the same.

23 Qd7+ Kf8 24 Rf6+ Qf7 25 Qxf7#

This has got to be the right idea, the only question is whether white has something more decisive in the first line that I'm overlooking.

Time to check.

Oct-29-10  rilkefan: I just looked at 20...Qxe6 21 Qg7 with Re1 and Qxh8 or f7 coming, thinking there was no way Black could survive if the rooks were allowed in, but 21. Rf6 is maybe even nicer than the initial sac.
Oct-29-10
Premium Chessgames Member
  OBIT: Heh, I didn't look at 20...Kf7 for more than a few seconds, figuring White has to be winning, but 21. Rxf6+! is a neat short-cut.
Oct-29-10
Premium Chessgames Member
  Phony Benoni: One more detail: after 20.Rxe6+ Kf7 21.Rxf6+ Kxf6 22.Rxd6+ Ke5, White has a standard mate: 23.Qd4+ Kf5 24.Rf6+ Kg5 25.Qf4+ Kh5 26.Rh6#. Useful pattern to know.
Oct-29-10
Premium Chessgames Member
  Jimfromprovidence: I noticed that if white could check on the 7th rank, it would force the king to the 8th rank, perhaps winning the a rook for white.

I came up with 20 Qe4, below, (threatening Qb7+), seeing 20... Qc8 21 Qd5, winning the d pawn.


click for larger view

Oct-29-10  gprice: <Phony Benoni: One "defense" not yet mentioned: 20.Rxe6+ Qxe6 21.Qg7+ Kf8 22.Qxh8+ Qg8. > probably because 21...Kf8 is illegal!
Oct-29-10
Premium Chessgames Member
  Phony Benoni: <gprice> Yikes! If you don't mind, I'm going to delete that post. Your reply is embarrassing enought!
Oct-29-10  CHESSTTCAMPS: In this unusual middlegame position, material is even, but white has the critical advantage of a much safer king sitting in a normal castled position with a solid pawn shelter. The black king's unusual 3-pawn shelter in the middle is inadequate (especially with the centralized enemy rooks bearing down), but it woud be terrific if there were additional pawns at d7 and f7:) The vulnerability of the black king to lateral checks and the poor position of the black rooks suggests the breakthrough

20.Rxe6+! Accepting this sacrifice is a disaster:

A) 20... Qxe6 21.Qg7+ Qf7 22.Re1+ wins the queen

A.1) 21... Ke8/d8 22.Qxh8+ wins two rooks.

At least one way of declining allows white chances to go wrong:

B) 21... Kf7 22.Rxf6+!!

Immobile major pieces in the corners don't defend well! Not 22.Qxg8+? Rhxg8 23.R1xd6 Rxg2 and black has some counterplay in the ending.

Kxf6 23.Rxd6+ Ke5 24.Qd4+ Kf5 25.Rf6+ Kg5 26.Qf4+ Kh5 27.Rh6#

B.1) 22... Ke7 23.Re6+! (renewing the original sac offer) Kf8 (Qxe6 24.Qg7+ wins) 24.Qf5+ Qf7 (Kg7 25.Qf6#) 25.Rf6 wins.

B.2) 22...Ke8 23.Re1+ Kd8 24.Rxd6+ Kc7 25.Qd7+ Kb8 26.Rb6#

B.3) 23... Ke7/f7 24.Qd7+ Kf8 25.Rf6+ forces mate.

C) 20...Kd7/d8 21.R6xd6+ Kc7 22.Qd7+ Kb8 23.Rb6#

C.1) 21... Ke7/e8 22.Qd7+ Kf8 23.Rxf6+ forces mate.

Did white take full advantage of this opportunity?

Oct-29-10  rilkefan: It would be nice if there were (or I knew) a simple way to transfer a line from the chessviewer score into a comment - it would reduce typos and take advantage of the app's legality-checking.
Oct-29-10  CHESSTTCAMPS: White did in fact find the shortcut that I sought (and found) when I wasn't satisfied with reaching a rook and pawn ending. This is the position after the move 21.Rxf6+ and there is no defense for black:


click for larger view

Oct-29-10
Premium Chessgames Member
  DarthStapler: I got the first move
Oct-29-10
Premium Chessgames Member
  Once: <rilkefan> Try this:

1. right mouse click on the game score

2. select the first option (Copy game)

3. left click into the kibitz box to activitate it

4. paste the game score with either control-V or another right click and select paste.

5. edit to taste

Also works with diagrams.

Oct-29-10  CHESSTTCAMPS: In the line 20 Rxe6+ Qxe6 21 Qg7+ Kd8 22 Qxh8+ Qe8 (<dzechiel> - a move I failed to consider), I prefer the continuation 23.Qxf6+ Kc8 (Qd7? 24.Rxd6+ wins the Q) 24.Qxd6 to be followed by 25.Kb1 and 26.Rd5.
Oct-29-10  rilkefan: <once> - thanks a lot. I'm having a bit of trouble making that happen quite so easily on my Mac for the score, but the diagram does work as promised. TPTB ought to add this info to the kibitzing help page.
Oct-29-10  M.Hassan: "Difficult" White to play 20.?
Materials are equal.
Square b6 keeps blinking in my eyes and I think the staring move would be

20.Rxe6+

Two lines may emerge from here:
Line A)
20...........Qxe6
21.Qg7+ Qf7
<if King goes to 8th rank, both Rooks are lost 21....Ke8 22.Qxh8+ Ke7 23.Qxa8>

22.Re1+ Kd7
23.Qxf7+ Kd8
24.Qxf6+ Kc7
25.Re6 Rad8
26.Re7+ Kb8 <26..Rc7 won't work, White looses one Rook and Black both Rooks> 27.Qf3 May be time to resign

Line B)
20.........Kf7
21.Qe4 Re8
22.Rdxd6 Qg5+
23.Kb1 f5
24.Qb7+ Kf8
25.Rf6+ Kg8
26.Qf7#

Time to check
--------------
Game continued almost along Line B) but White checkmated in a more subtle way

Oct-29-10
Premium Chessgames Member
  Once: upon a time, in a land forever at war, there was a king who hid behind a wall.

The wall was broad and strong, and made entirely out of his own foot soldiers.

"Marvel at my wall!" said the king proudly. "No-one else has a wall like this."

And this king dreamed of an endgame when all the rooks and queens had left the kingdom. Then he and his wall would sweep forwards and crush the white king. How could the white monarch possibly survive without a magnificent wall of his own?

But the white army were not impressed or scared by the black king's wall. Not one little teensy bit. Walls could be knocked over or gone around.

All it needed was one brave volunteer...

20. Rxe6+ And the wall is breached by the brave Re1 giving up its life.

Now what was the black king to do? His first thought was to call up his queen with 20...Qxe6. But then the black army would sweep around the wall with 21. Qb7+


click for larger view

And the black king finds to his horror that his beloved wall has become a prison. If he runs to the back rank, white picks up both black rooks starting with Qxh8+. And if 21...Qf7 22. Re1+ and the wall gets in the way and the black queen cannot be defended.

So black cannot take the white rook. He tries in vain to hide behind what is left of his wall.

20...Kf7 21. Rxf7+ Another chunk of wall comes crashing down.

21...Kxf6 22. Rxe6+ And with a final rook move, the last brick in the wall is gone. The king is defenceless against the white rook and queen. And right now, he starts to wish that he had spent more time developing his own rooks instead of going on night classes into bricklaying.

<Once> upon a time, in a land forever at war, there was a king who hid behind a wall. It doesn't have a happy ending.

Oct-29-10  Boerboel Guy: I got this very quickly today!
Oct-29-10
Premium Chessgames Member
  TheBish: A Miatello vs G Gaehwiler, 2010

White to play (20.?) "Difficult", even material.

Not too difficult, I think, as there are not a lot of candidate moves that are worth looking at. You want to look at captures and checks, and the key move has both.

20. Rxe6+! Qxe6

Otherwise White could trade queens and clean up more pawns with Rdxd6, but even stronger (after 20...Kf7) is 21. Rxf6+! Kxf6 22. Rxd6+ with a mating attack, e.g. 22...Kf7 23. Qd7+ Kf8 24. Rf6+ Qf7 25. Qxf7#, or 22...Ke5 23. Qd4+ Kf5 24. Rf6+ Kg5 25. Qf4+ Kh5 25. Rh6#.

21. Qg7+ Kd8

Or 21...Qf7 22. Re1+ wins the queen, 21...Ke8 22. Qxh8+ wins the other rook, and 21...Kd8 (21...Kf8 is similar) 22. Qxh8+ Qe8 23. Qxf6+ will win at least three pawns for an easy win.

Oct-29-10  marcwordsmith: I saw Re6+ and thought I'd solved the puzzle because I assumed black had to take the rook. So I don't get "full points" because I didn't even think to look for Rxf6+! which is really the more difficult-to-find move.
Oct-29-10  Boerboel Guy: <Once> Slightly off topic (not chess) but nevertheless to do with wall-breaching :-) This is hectic!
http://wimp.com/parkourdog/
Oct-29-10
Premium Chessgames Member
  patzer2: For today's Friday puzzle, 20. Rxe6+! destroys the helpless Black King's illusion of security and will quickly win decisive material or mate.
Oct-29-10
Premium Chessgames Member
  David2009: A Miatello vs G Gaehwiler, 2010 White 20?

20 Rxe6+ Qxe6 21 Qg7+ and now (a) 21...Qf7 Re1+ wins Q for R ; (b) 21...Kd1 22 QXh8+ Qe8 and White has won material. Time to check:
======
Black declines the sacrifice and plays 20...Kf6. That's fine. The quickest win is 21 Rxf6+ which one would find over the board: there may be others.

Crafty End Game Trainer check (not really necessary here, but one often learns something):


click for larger view

A Miatello vs G Gaehwiler, 2010 White 20? http://www.chessvideos.tv/endgame-t... Black defends with ...Qxe6 and ...Kd8 but rapidly loses too much material for the game to be worth continuing.

This is a very impressive White win. Playing through it Black seemed to be doing all the sensible things: and yet lost. 19...e5! was necessary. Now 20 Qg7+ Ke6 21 f4 Rf8 22 Qxh7 wins a Pawn for starters (Black can't play 21..Rg8 22 Qxh7 Rxg2? because of 23 Qh3+). White should win but it will not be easy.

Crafty End Game Trainer link to the position at move 19:


click for larger view

(A Miatello vs G Gaehwiler, 2010 White 19?: White plays 19 Qg4) http://www.chessvideos.tv/endgame-t...

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