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Oleg Korneev vs Rodney Oscar Perez Garcia
Albacete IM-A (2000), rd 7, Sep-05
Russian Game: Classical Attack (C42)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 3 ·  Later Kibitzing>
Nov-12-10  gofer: Black has managed to get its queen and knight stranded, leaving the humble rook and bishop to protect the king... ...big mistake!

24 Rxe6 ...

Winning immediately as black cannot accept the sacrifice and losing a limb in battle is not going to make the fight a fair one... ...even if you are the invincible "Black Knight" of Monty Python fame...

24 ... fxe6
25 Be5 Rf7 (Rf6 26 gxf6 gxf6 26 Bxf6 mating)
26 Qc8+ Rf8
27 Qe6+ ...

So far everything has been forced, now black gets a choice, but either choice is fatal.

27 ... Rf7
28 Bd6 g6 (h6 g6 mating)
29 Qe8+ Kg7
30 Be5+ Rf6
31 Bxf6#

27 ... Kh8
28 g6 h6 (hxg6 Qxg6 mating)
29 Qe7 Rg8
30 Bxg7+ Rxg7
31 Qf8+ Rg8
32 Qxh6#

Much easier than yesterday! Time to check...

Nov-12-10  gofer: <dzechiel:> I think that black simply ignores 24 Bd6 and plays 24 ... Qc3. Black solidifies its position and has opportunities for counterplay via Qd5 and Qg5+... Yes black is still losing, as it is giving up a rook for nothing, but I don't see it as being a forced mate, where as 24 Rxe6 fxe6 leads to a forced mate...
Nov-12-10
Premium Chessgames Member
  whiteshark: Missed the final shot.
Nov-12-10  Matewro: Can anyone explain what's wrong with line 24. Rxe6 fxe6 25. Bh3? On page first, someone cited that 25...Qc4 collapses this, but then comes 26. Qe7 and Black is either getting checkmated, or losing a Queen. Or he isn't?

I spotted the obvious exchange sacrifice as well as Be5 follow-up, but I couldn't find the point of Queen back-rank check. So I turned to 25. Bh3 and it seems winning in variation above. Am I missing something?

...

..alright. By now, I found a curious maneuver: 25. Bh3 Qd1+ 26. Kg2 Qh5 27. Bxe6+ Kh8 and it seems that White is in lots of trouble after Black Queen joined the defence.

Nov-12-10
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

Black threatens the pawns on the queen side: ... Nc4, ... Qxa3, etc., but not 24... Qxa3 25.Bd6 Qxc3 (25... Rc8 26.Qxc8+) 26.Bxf8 Qxe1 27.Qd8 h6 28.Bb4+ Kh7 29.Bxe1.

The black queen and knight cannot protect the castle quickly. This suggests, 24.Rxe6, eliminating one of the few defenders, 24... fxe6 25.Be5 Rf7 26.Qc8+ Rf8 27.Qxe6+:

A) 27... Kh8 28.Qh6

A.1) 28... Rg8 29.g6 and 30.Qxh7#.

A.2) 28... Rf7 29.g6 Kg8 30.gxf7+ Kxf7 31.Qxg7+ + -.

A.3) 28... Rf6 29.gxf6 gxh6 30.f7#.

B) 27... Rf7 28.g6 hxg6 29.Qe8+ Rf8 (29... Kh7 30.Qxf7) 30.Qxg6 Rf7 31.Bh3

B.1) 31... Qd1+ 32.Kg2 Nc4 33.Be6 Ne3+ 34.fxe3 Qf2+ 35.Kh3 (35.Kh1 Qf1+ 36.Qg1 Qf3+ 37.Qg2 Qd1+, draw) Qf3+ 36.Bg3 Qf1+ 37.Kh4 + -.

B.2) 31... Nb7 32.Be6 Nd8 33.Qxg7#.

B.3) 31... Qxa3 32.Be6 Qf8 (32... Qe7 33.Qxg7#) 33.Bxg7 Qxg7 34.Bxf7+ Kf(h)8 35.Qxg7+ Kxg7 36.Ba2 + - [B+2P vs N].

Nov-12-10
Premium Chessgames Member
  agb2002: I saw 28.Bd6 but discarded it without any analysis, probably because I was convinced that the LSB was necessary to conclude the attack.

28.g6 in line B is a blunder which seems to achieve a draw at best and 32.Kg2 in line B.1 is replied with 32... Qf3+ 33.Kg1 Qxh3 winning.

Better luck tomorrow.

Nov-12-10  franksp: If 28...h6 then 29.g6.

if 28...g6 then 29.Qe8+ Kg7 30. Be5+ etc.

Nov-12-10  franksp: Had Black played 27...Kh8, then 28.Qh6 Rf7 29.g6 Kg8 30.gf+ Kxf7 31.Qxg7+ Ke6 (If 31...Ke8 32.Bd6 soon mates.) 32.Qf6+ Kd7 33.Qf7+ Kd8 34.Bd6 etc.
Nov-12-10  desiobu: I gave up prematurely before finding the winning plan with Be5. I like <Rob Morrison>'s line.
Nov-12-10  CHESSTTCAMPS: In this middlegame attacking position, white has the bishop pair and a substantially more active force. Black's queen and knight on the rim are both dim, so white should seize the day while the black queen is away. Within black's castled position, g7 is a vulnerable target, so the clearance sac is begging to be played:

24.Rxe6!

I saw the ensuing forced sequence quickly enough, but I couldn't find the coup de grace right away, so I spent valuable time investigating 24.Bd6 first. This is *not* efficient analysis.

24... fxe6 25.Be5 Rf7 26.Qc8+

The sequence to pick off a pawn 26.Qb8+ Rf8 27.Qxa7 Rf7 28.Qb8+ Rf8 29.Qc7 Rf7 30.Qc8+ is completely unnecessary.

26... Rf8 27.Qxe6+

Now there are two pretty finishes, the first of which eluded me longer than it should have:

A) 27... Kh8 28.Qh6! Rf7/g8 29.g6 wins.

B) 27... Rf7 28.Bh3! Qb3 (or c4) 29.Qe8+ Rf8 30.Be6+ wins

B.1) 28... Qd1+ 29.Kg2 and the threat of 30.Qe8+ followed by 31.Be6+ can't be parried.

B.2) 28... h6 29.g6 wins.

B.3) 28... c5 29.Qc8+ Rf8 30.Be6+ Kh8 31.Qxf8#

A sacrificial win should not be a surprise - white is effectively up queen plus two bishops on the kingside, an unfair fight.

Nov-12-10  CHESSTTCAMPS: <desiobu: I like <Rob Morrison>'s line.>

Also from <dzechiel>. I have to agree. For some reason, I looked at 24.Bd6 Re8 25.Bh3. I saw it but missed it!

Nov-12-10  Patriot: This took me a while and had some difficulty finding key lines.

My thought process went something like this:

---

First I don't see a forced mate for white so I should look at black's threats. Black may be threatening a3 or consolidating with Re8.

Now I should look for forcing candidates for white. I see two forcing moves for white: Rxe6 and Bd6. On 24.Bd6 maybe just 24...Re8, but it's not exactly clear how to proceed. Let's take a look at Rxe6 since that seems more forcing, since it is an immediate capture.

24.Rxe6 fxe6 25.Be5 Rf7 26.Qc8+ Rf8 27.Qxe6+

So far everything is forced and that's a good sign. Black has only two responses, Kh8 or Rf7.

A) 27...Kh8 28.Qh6

A.1) 28...Rf7 29.g6

A.2) 28...Rg8 29.g6

A.3) 28...Rf6 29.gxf6 gxh6 30.f7#

A.4) 28...Re8 29.Qxg7#

So Kh8 is clearly bad.

B) 28...Rf7

At least if this is a failed attack, I can get a perpetual with 29.Qe8+ Rf8 30.Qe6+. White's main problem is that after a check, black can play Rf8 and go for a draw. I can stop this on Bd6, threatening immediate mate with Qe8+ or Qc8+.

B) 29.Bd6

Black must push one of the pawns.

B.1) 29...h6 30.g6

B.2) 29...g6 30.Qe8+ Kg6 31.Be5+ Kg6 32.Qg8+ Kf5/Kh5 33.Qxf7+

That must be it.

-----------------

Most of this was forced and it took me longer than I would like. Some of it I had to "play" over again in my head to visualize where everything was, which cost more time. I didn't immediately see a few key variations, such as 28.Qh6 and especially 29.Bd6.

Nov-12-10  goldenbear: Very easy puzzle for me. I saw the game continuation in 15 seconds. I think this was a much easier puzzle than yesterday, probably because I "solved" yesterday's with Nf3 which was a bit more difficult to calculate.
Nov-12-10  Patriot: I see now that I mentally stole one of black's pawns. In line B.2, it should say "30...Kg7 31.Be5+ Kg6" but 31...Kg6 is impossible because of black's g6-pawn. What was I thinking??! And I was doing so well... :-(

Of course, 31...Rf6 32.Bxf6#.

Nov-12-10
Premium Chessgames Member
  kevin86: I guessed this one by playing it. The moves easy follow from one another-there are no surprizes.
Nov-12-10  patzer2: <Patriot> After 27...Kh8, your 28. Qh6! Rf7 29. g6! is a good route to keep Black in a mating web.

The other winning approach is 27...Kh8 28. Qe7! Rg8 29. g6! .

Nov-12-10  BOSTER: In modern chess even three pawns in front of the castled king does not guarantee his security. Black queen and her companion knight,"Gone by wind" on the edge of the board,looks like spectacular spectators in the next battle. 24.Rxe6 fxe6
25.Be5 Rf7
26.Qc8+ Rf8
27.Qxe6+ Rf7 (or kh8 Qe7 Rg8 wins)
28.Bd6 with winning.
Nov-12-10  David2009: O Korneev vs R Perez, 2000 postscript: Putting the puzzle into Crafty EGT


click for larger view

O Korneev vs R Perez, 2000 White 24?

After 24 Rxe6 Crafty EGT declines the piece with 24...Qc7. After 24 Bd6 Ra8 25 Rxe6 Crafty again declines the piece, this time with 25...c5. Both these are wins for White (blunders permitting), so we don't learn much. Link: http://www.chessvideos.tv/endgame-t...

After the game continuation 24 Rxe6 fxe6


click for larger view

and then 25.Be5, the EGT follows the game line with 25.Be5 Rf7 26.Qc8+ Rf8 27.Qxe6+ and then 27...Kh8. Now either Qh6 <iamcoolright>, <Patriot> or Qe7 <David2009, gofer, patzer2,...> win. EGT further link: http://www.chessvideos.tv/endgame-t...

There is one pitfall: <rilkefan: I had 27...Kh8 in mind, when I couldn't calculate further but had 28.g6 in mind to continue the attack, with Bd3 on the way> The immediate 28.g6 can be met by 28...Qc2! threatening Qxg6+ so 28. Qe7 first is necessary, forcing Rg8. Now 29 g6! wins since 29...Qc2 is met by <gofer>'s checkmate 30.Bxg7+! Rxg7 31.Qf8+ Rg8 32.g7# and 29...h6 leads to mate starting Qh4. Congratulations to <dzechiel> <timothee3331> <al wazir> and <Quentinc> who found 24 Bd6! as the alternative solution. Special mention to <patzer2> who gave both 24 Bd6 and the key alternative line of the actual game continuation (28. Qe7 Rg8 29. g6!). Apologies to any one whom I have missed off these lists.

Nov-12-10  Ormiston: This is my first post (that I recall). Every weekday I log on and study the puzzles and read the posts. I was so impressed by dzechiel's analysis that I felt compelled to say, "Very NICE!". :) I'd also like to say that the community of kibitzers this year is wonderful and I hope it continues. Great job All!!
Nov-12-10
Premium Chessgames Member
  Once: <Ormiston> Welcome to the community!
Nov-12-10  Ormiston: Thanks Once. You are one of my favorite additions to the kibitzing this year as well. I think I will post more often going forward.
Nov-12-10  Eduardo Leon: Wow. Didn't take me <that> long. Just a few seconds to decide 24.♖xe6 fxe6 25.♗e5 was worth analyzing, and a mere two minutes to find 28.♗d6.

<24.♖xe6 fxe6 25.♗e5>

Threatening mate in one, which keeps black from bringing his queen and knight to the defense.

<25...♖f7 26.♕c8+ ♖f8 27.♕xe6+ ♖f7 28.♗d6!>

I am trying to be conservative with exclamation points, but this move is really beautiful, despite its simplicity. Again, this bishop is not used to check black, but to make paralyzing mate threats. The following moves are given for the sake of completeness.

<28...g6 29.♕e8+ ♔g7 30.♗e5+>

A simple yet instructive combination.

Nov-12-10  Eduardo Leon: Wow. Missed the line 27...♔h8 28.♕h6, and now either 28...♖f7 or 28...♖g8 are replied with 29.g6, which is even more beautiful.
Nov-12-10  MaczynskiPratten: At first 24 Bd6 looks as if it only wins the exchange if Black lets White take on f8. But the threat is 25 Bxf8 Kxf8 26 Qd8#. If Black tries to make a defence route for the Queen with 24...c5, the continuation seems to be 25 Bxf8 Kxf8 26 Qd8+ Qe8 27 Qxe8+ Kxe8 28 d5! winning the Bishop with the pin and indeed ending a Rook up. Black's alternative is to give the King an airhole with 24..g6 but it looks very draughty.

After 24 Bd6, if Black could swing his Q to the g file White could be in trouble, but White's army are performing joint heroics in cutting the Queen off from any sensible route. The Bf1 guarding b5, the Re1 stopping Qd1, the d pawn blocking Qg4+ and the c pawn guarding it, and even on B on d6 protecting a3, all play their part.

I went for 24 Rxe6 and missed Bd6 (if you see a good move, look for a better one). I still like Rxe6, but the critical line seems to be after 27..Kh8 rather than Rf7.

Nov-12-10
Premium Chessgames Member
  scormus: I really couldn't decide between 24. Bd6 securing a points win, and Rxe6 going for the KO.

OTB I would certainly play Bd6 leaving B no option but allow 25 Bxf8. If 24 ... Re8 25 Rxe6 and I perhaps ... c5. After 24. Rxe6 I'd be worried I might have missed something and running into a counterpunch.

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