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Marcos Llaneza-Vega vs Ricardo Brosa Alvarez
Asturias-ch (2004), Oviedo, rd 6, Mar-19
French Defense: McCutcheon. Lasker Variation (C12)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Oct-07-14  Cheapo by the Dozen: Rxc8+ followed by Nd6+
Oct-07-14  Cheapo by the Dozen: This actually took me a minute or more. The more direct mating attacks don't quite work. The quiet Qe8, even though it closes off ... Qh5+, doesn't work well either, as finally sank in when I realized that if White can ever get his king to b2, it isn't sheltered from checks there, due to Rxb5+.

But

33 Rxc8+ Kxc2
34 Nd6+

threatens immediate mate, and hence compels Black to relinquish his queen.

Oct-07-14  diagonalley: neat... 33.RxB+ of course... but (ditto <cheapo>) it's not immediately obvious.
Oct-07-14  The17thPawn: Damn. I thought 33. Nd6+ was the clincher and didn't consider the rook move.
Oct-07-14  Cheapo by the Dozen: 33 Nd6 fails simply to 33 ... Qxc3.
Oct-07-14  The17thPawn: of course than I realized it wasn't check:)
Oct-07-14  plumbst: Easy. White is down a pawn. White's Knight is under attack.

Really concise.

33.Rxc8+! Kxc8
34.Nd6+ Qxd6 (34...Kb8 35.Qb7#)
35.Qxd6

Oct-07-14  M.Hassan: White is a pawn down and has a Knight for a Bishop.

33.Qe8
Black can not check the King to delay the attack:

<33.....Qh5+ 34.Qxh5> <33....Qd4+ 34.Nxd4>

33..........Rxb5
34.Qxc8+ Ka7
35.Rc7+ Qxc7
36.Qxc7
And Black has to contiue a Queenless game
1-0
===========
In the text game also Black ends up continuing in a Queenless game

Oct-07-14  diagonalley: <M.Hassan> ...nice one! ...hadn't even considered that line
Oct-07-14  goldfarbdj: Rxc8+ was the obvious move, but I didn't find the followup of Nd6+. I looked only at Qe8+, which leads nowhere. So I settled on 33 Qd6+ Qxd6 34 Nxd6 Bd7 35 h5. I think that does win, as it will be very difficult for black to stop the h-pawn, but it's a great deal longer and less certain than mate in three.
Oct-07-14
Premium Chessgames Member
  agb2002: White has a knight for a bishop and a pawn.

Black threatens 33... Rxb5.

White can win decisive material with 33.Rxc8+ Kxc8 34.Nd6+ Qxd6 (34... Kb8 35.Qb7#) 35.Qxd6 followed by h5, h6, etc.

Oct-07-14
Premium Chessgames Member
  Once: That's a really interesting puzzle. Like <Cheapo by the dozen> and <diagonalley>, I was immediately attracted to 33. Rxc8+ as the most forcing move on the board, but it took quite a while to see 33...Kxc8 34. Nd6+

It's a relatively simple three or four move combination. But I didn't spot it straight away.

I wonder why?

Perhaps we have a bit of a blind spot when it comes to knights. Knights are funny creatures. They have such a short range hopping move that it takes them a long time to cross the board. So we need to give them outposts. Safe little niches where they can rest awhile and get their breath back after a long journey.

And once a knight is in an outpost, maybe our instinct might be to leave him there. Which could explain why I initially didn't want to move the knight. I tried all sorts of rubbish with queen checks, which was getting me nowhere.

But there is something else unusual about knights. A knight sitting on a white square attacks black squares and vice versa. In today's POTD, our knight on b5 (a white square) attacks the juicy black squares of a7 and c7. That's great, but those squares are amply defended by black's queen, rook and king.

Shift the knight to the black square of d6 ...


click for larger view

... and instantly the knight is attacking the white squares of c8 and b7. And black isn't defending those squares.

There is something else interesting in this position. <M Hassan> is absolutely right to point out 33. Qe8 as an alternative winning move. For that matter Qd8 and Qf8 also win, according to Fritzie.

And those are moves which also never occurred to me - possibly because I am preprogramed to look at smiting moves like 33. Rxc8+

Great puzzle today. Nice and simple, but also easy to go wrong. And very instructive.

Oct-07-14  gofer: 33 Rxc8+ Kxc8 (forced) 34 Nd6+ Qxd6 (forced) 35 Qxd6

The only question is when did Black resign? Ph4 will promote and there is nothing that black can do about it, so when did this dawn on black, I would guess that <33 Rxc8+> is the end of the game.

~~~

<diagonalley: <M.Hassan> ...nice one! ...hadn't even considered that line> Ditto: Except perhaps to say there is a stronger continuation than <34 ... Qxc8+>!

<33 Qe8 ...>


click for larger view

33 ... Qh5+ 34 Qxh5
33 ... Qd4+ 34 Nxd4

<33 ... Rxb5>
<34 Rxc8+ ...> is mate in three more!


click for larger view

<33 Qe8 is beautiful!> Kudos!

Oct-07-14  newzild: I went for the first win I saw, which was 33. Qd8. After Qh5+ 34. Ke1, Black has no more checks.

I note that <M. Hassan> chose a similar line, starting 34. Qe8.

Oct-07-14  morfishine: 33.Rxc8+ Kxc8 34.Nd6+ Qxd6 (or 34...Kb8 35.Qb7#) 35.Qxd6 and White wins

*****
<M.Hassan> Very good to point out the quiet though also winning <33.Qe8>; However, better is <34.Rxc8+> 34...Ka7/b7 35.Qd7+ forcing mate instead of "just" winning the Queen (35...Ka6 36.Ra8#)

*****

Oct-07-14  Cybe: Quite good is 33. Qd8, 33… Q:c3, 34. Q:b6+, 34… Ka8, N:c3.
Oct-07-14  Muztang: Nuts. I got something less powerful, but i wonder if it works... How about 33. Qd6 Qxd6
34. Nxd6
With nothing to stop the h pawn on time?
(as Ra7 is met by Rxc8#)
Oct-07-14  LIzzard: This took me longer than it should have, but got there with the rook sac and the knight follow. <M. Hassan> - nice line! I dismissed moves that didn't check because of the queen, but didn't spot that stop!
Oct-07-14  eblunt: I had 33 ♕e8 as well . Black has no check (apart from ones where he loses the Queen), and has no way of preventing Qxc8+ next move, which will be fatal as per < M.Hassan >. Looks like Qd8 also wins as pointed out by others.

Not a particularly good puzzle today IMO, with so many winning moves, some of which are quite 'dull' and un-puzzle like.

Oct-07-14  hcgflynn: 20. - Kd7 seems a very bad move. 20. - b6 or 20. - Qd8 seems way better. Black's next three moves are questionable as well.
Oct-07-14  Cheapo by the Dozen: I suspect Black has a lost position for a looooong time. He couldn't free himself without creating fatal weaknesses (as in the game) -- but if he didn't free his remaining pieces, then the h-pawn would eventually walk home.
Oct-07-14  zb2cr: White wins material with 33. Rxc8+, Kxc8; 34. Nd6+, Qxd6 (34 ... Kb7; 35. Qb7#). White is up by Q vs R+P, and Black's extra Pawn is about to be lost (note the double attacks against e6 and b6).
Oct-07-14
Premium Chessgames Member
  Once: <Muztang> I briefly looked at that line too.

Fritzie says that the h pawn can be stopped, for example by 34. Bd7 h5 35. d4 Rh3 36. Kc7


click for larger view

Black will be able to play Ra8 and Rh8. Fritzie is calling this half a box of duck eggs (0.00) which probably means that he has one or other of the players forcing a perpetual.

It's a nice try, but I don't think it works. Sorry.

Oct-07-14  Bubo bubo: 33.Rxc8+ Kxc8 34.Nd6+, and Black loses either his king (34...Kb8 35. Qb7#) or his queen.
Oct-07-14  M.Hassan: <diagonally>, <gofer> & <morfishine>

Thanks for very nice comments. I saw 33.Rxc8+ line but failed to see the continuation and I quite agree that it is a more forcing line. As a similie, I can say that the text line is like the bite of a dangrous venomous snake that kills fast but my line is like an annaconda wrapping around the prey and killing the prey by asphyxiation.

<morfishine: However, better is 34.Rxc8 34...Ka7/b7 35.Qd7+ forcing mate....> You probably mean 33.Rxc8 Ka7/b7 . King can not go to b7

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