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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 3 OF 3 ·  Later Kibitzing>
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  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.

Nov-12-10  MaczynskiPratten: Ah, I missed 28 Qh6! after Kh8. But even after 28 Qe7 Rg8 29 g6 h6, 30 Bxg7+ Rxg7 31 Qf8+ Rg8 32 g7+ Kh7 33 Bd3# seems to bring home the bacon. Alternatively 29..Qd1 30 Bxg7+ Rxg7 31 Qf8+ Rg8 32 g7#.

So 24 Rxe6 seems to lead to a forced mate in all variations and therefore appears superior to 24 Bd6 after all.

Nov-12-10  wals: I considered 24.Bd6 but got lost in the calculations.

Rybka 4 x 64
depth: 19 : 17 min :
1. (7.48): 24.Bd6 Ra8 25.Rxe6[] Qd1 26.Qxa7[] Qg4+ 27.Bg3[] Rf8 28.Re5[] b5 29.Qxa5 Qd7 30.Qb4 Qc8 31.Re7 Qg4 32.Qc5 g6 33.Be2 Qc8 34.Bf3 Qh3 35.Bxc6

2. (7.12): 24.Rxe6 Qc2 25.Rd6 Qf5 26.Rd8 Qg4+ 27.Bg3[] f6 28.Rxf8+ Kxf8 29.gxf6 gxf6 30.Qxa7 h5 31.Qxb6 h4 32.Qxa5 hxg3[] 33.hxg3 Qf3 34.Qd8+

3. (2.13): 24.Qe7 Qc2 25.Bh3 h6 26.Bd6 Ra8[] 27.Bxe6[] fxe6 28.Qxe6+ Kh7 29.gxh6 Qg6+[] 30.Qxg6+ Kxg6 31.Re6+ Kf5 32.Re5+[] Kg6 33.Bb4 Nb3 34.Re6+ Kf5 35.Rxc6 gxh6 36.f3 Re8 37.Rxh6 Re2 38.Rh8 a5 39.Rf8+

depth: 20 : 5 min :
Black blunder
( 0.97):21...Bxe5. Best, Bd8, =0.06.

depth: 19 : 5 min :
Black blunder
(+7.48):23...b6. Best, Nc4, + 1.33.

Black resigned move 28.

Nov-12-10  Patriot: <<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!>

Oh I see it now. The threat is 30.Bxg7+ Rxg7 31.Qf8+ Rg8 32.g7#. So on 29...Qb3 30.gxh7 Kxh7 31.Bd3+ Kh6/Kh8 32.Qh4#. Or if 29...h6 30.Bxg7+ Rxg7 31.Qf8+ Rg8 32.Qxh6#. And of course, 29...hxg6 30.Qh4#.

Tricky--I didn't consider that line.

Nov-12-10  WhiteRook48: I only got the first move
Nov-12-10
Premium Chessgames Member
  al wazir: <dzechiel: On 24 Bd6 Rc8 the fastest win has to be 25 Qxc8+.>

OK, then I wasn't quite with you.

On another note, I score by taking into account degree of difficulty. I give myself 1 point for Monday, 2 points for Tuesday, and so on -- full credit only for a *complete* solution. Maximum possible is 28 points, but I doubt if anyone ever gets that. On Sunday puzzles the players themselves probably don't analyze all possibilities ahead of the move. I've never gotten as many as 20 points, but so far this week I have about 13 out of a possible 15.

I recommend this scoring system for serious solvers. What would your highest be?

Nov-12-10  RandomVisitor: After 19...Qa4:


click for larger view

Rybka4

<[+0.92] d=16 20.Ng4> Bxg4 21.Qxg4 Qxa3 22.Qg3 Qb3 23.Bxc7 Nc4 24.Qd3 Nb6 25.Rb1 Qe6 26.Bxb6 axb6 27.g3 g6 28.Bg2 Ra8 29.Bxb7 Ra3 30.Bg2 Bg7

[+0.52] d=16 20.Qf3 Qb3 21.h3 Bd8 22.Bd2 Be6 23.Bd3 Qa2 24.Bf4 f5 25.c4 Nxc4 26.Bxc4 Bxc4 27.Qxb7 Bd5 28.Qxa7 Bh4 29.g3 Be7

Nov-12-10  dzechiel: <al wazir: ... On another note, I score by taking into account degree of difficulty. I give myself 1 point for Monday, 2 points for Tuesday, and so on -- full credit only for a *complete* solution. Maximum possible is 28 points, but I doubt if anyone ever gets that. On Sunday puzzles the players themselves probably don't analyze all possibilities ahead of the move. I've never gotten as many as 20 points, but so far this week I have about 13 out of a possible 15.

I recommend this scoring system for serious solvers. What would your highest be?>

I have no idea, as haven't graded myself in this manner. But!, a new week is about to start. *IF* I can remember that long, I'll try to add my "running score" at the bottom of each post.

Over the years I have had one or two weeks where I thought I solved each of the daily positions, but only to the extent my lines matched the game text. I'm sure I never published all the (likely?) lines for a Saturday or Sunday position.

Nov-12-10  timothee3331: <CHESSTTCAMPS> <The sequence to pick off a pawn 26.Qb8+ Rf8 27.Qxa7 Rf7 28.Qb8+ Rf8 29.Qc7 Rf7 30.Qc8+ is completely unnecessary.> You call this unnecessary, i just call it funny and nice !! Maybe this is somehow the same thing....

I'm no follower of the "Botvinnik Chess School" whose director was quoted as saying "young man, i never play chess for fun" and "yes, i once played a blitz, it was in a train back in 19--" (don't remember the date ^^) . But from a purely chessic point of view, i completely agree with you, and in fact, seeing a clear win, i wouldn't have forced my heart support a few more minutes of playing, furthermore i didn't elect that line of play.

Nov-12-10  redorc19: easy...
Nov-12-10  TheBish: O Korneev vs R Perez, 2000

White to play (24.?) "Difficult"

White wins with 24. Bd6 Re8 (or 24...Rc8 25. Rxe6!) 25. Rxe6! fxe6 (obviously 25...Rxe6 allows a back-row mate) 26. Be5 and Black has no defense against 27. Qxg7 mate.

Nov-12-10  goldenbear: <TheBish> Nice. I guess since it was a puzzle, I first looked at Rxe6, saw that it was winning, and looked no farther. But Bd6 is quicker. Great flexibility of mind.
Nov-12-10  LIFE Master AJ: Much too easy of a puzzle for a Friday!

I saw 24.RxB/e6 almost instantly, it only took about 30 seconds (or less) to work the win out.

However, I will say that I HAVE been working on tactics a lot lately.

****

See my forum for more details. (I was going to post a problem here, however, I think that the more approriate place for this would be my personal forum.)

Nov-12-10  LIFE Master AJ: Also - note that in the final position, BOTH Black's Queen and the Knight were "off-sides," and completely out of the game.
Nov-12-10  CHESSTTCAMPS: <timothee3331: <CHESSTTCAMPS> <The sequence to pick off a pawn 26.Qb8+ Rf8 27.Qxa7 Rf7 28.Qb8+ Rf8 29.Qc7 Rf7 30.Qc8+ is completely unnecessary.> You call this unnecessary, i just call it funny and nice !! ...>

I actually started looking at this thinking it could be part of the solution. In any case, I rather agree with you. I wish I had said "...is amusing, but completely irrelevant to the solution." Thanks for the comment!

Nov-12-10  tacticalmonster: 1) White has the unopposed dark square bishop

2) White 's queenside is weaker: weak a3 and c3 pawn vs a7 pawn

3) Black backrank is weak and g7 pawn has no defender

4) White rook put pressure on the open e-file while the f8 rook is not activated

5) White g5 pawn is a tower of strength! It freezes Black kingside

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

a) 27...Kh8 28 Qh6!

a1) 28...Rf7 (or 28 Rg8) 29 g6- mate is unavoidable

a2) 28...Rf6 29 gxf6! gxh6 30 f7#

b) 27...Rf7 28 Bd6!

b1) 28...h6 29 g6- mate in two

b2) 28...g6 29 Qe8+ Kg7 30 Be5+ Rf6 31 Qxf6+ Kg8 32 Qg7#

I think this is it!

Nov-12-10  LIFE Master AJ: 27...Kh8?; 28.Qh6! followed by g6.
Nov-12-10  LIFE Master AJ: Ooops. Sorry <TM> You beat me to the punch.
Nov-12-10  Nullifidian: Here's how I would approach it, though I'm almost certain that it isn't the way the game was played over the board:

24. ♗d6 ♖a8 (♖e8 is playable, but less accurate) 25. ♖xe6 ♕d1 26. ♕xa7! ♕g4+ 27. ♗g3 ♖f8 28. ♖e3 ♕xg5 29. ♕xb6 and eventually the other minor piece will fall.

Nov-17-10  timothee3331: <CHESSTTCAMPS> In fact it's a forced mate so that just transforms the evaluation <mate in x> in <mate in x+3> so let's admitt it's worse :) !
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