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Alexander Lagunow vs Bernd Schneider
Berliner Sommer 12th (1994), Berlin GER, Aug-??
English Opening: Great Snake Variation (A10)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Aug-21-15  dfcx: white needs to crack open the b7 pawn, the best way is to open the h1-a8 diagonal.

18.Bxc5 dxc5 19.e5 with the intention to play d6 next. Now black does not have any good responses.

19...fxe5? 20.d6 and black has to give up the queen to save the king.

19...Qc8 20.e6 (not d6 Bc6) Be8 21. d6 Bc6 22.d7 Qc7 23.Rxb7 mates

19...Bc8 20.d6 exd6 21.Ra3 with Rxa7+ followed by Qa3+ mates.

Aug-21-15  aporia: 21. ... a7-a5 won't help?
Aug-21-15  diagonalley: hmmmm .... i went for 19.P-Q6 - as did <stst> - and (as far as i can make out) it works... with white's KB subsequently coming into play
Aug-21-15  Ehrenfest: 21. .... a7-a5 crossed my mind as well, but then 22. ed6x and the blavk queen is overburdened. She cannot protect both a5 and b7 anymore.
Aug-21-15
Premium Chessgames Member
  mike1: got the game continuation but am now that sure anymore. how does White win after 18. Bxc5 dxc5 19. e5 Bc6? 20 dxc6 b6 is not that clear, or?
Aug-21-15  ajile: 21.Ra3 mates in 5. 21.Qa3 only mates in 9.
Aug-21-15  ajile: Note: The move I picked in this line 21.exd6 also wins but is slower to the finish.
Aug-21-15  Boerboel Guy: <mike1: got the game continuation but am now that sure anymore. how does White win after 18. Bxc5 dxc5 19. e5 Bc6? 20 dxc6 b6 is not that clear, or?>

How about 21 Rxb6!

Aug-21-15  gofer: Compared to yesterday this is a walk in the park. Black's got a gun to his head and white just needs to pull the trigger...

<18 Bxc5 ...>

18 ... Qxc5/Qa5
19 Rxb7 mating or winning the queen

18 ... Nh6
19 Bxa7 (Kxb7 20 Qa3+ mating)

18 ... dxc5
19 e5

black cannot stop white opening up the a8-h1 diagonal for its bishop to make it a 4 against 3 attack on Pb7.

Example 1

19 ... fxe5/Na6
20 d6

Example 2

19 ... Bc6
20 dxc6 b6
21 Rd1!

Example 3

19 ... Bc8
20 d6 exd6
21 Qa3! threatening Qxa7 mating

I imagine that black tries this last option and d6 kills him dead. But there is an alternative.

<18 ... b5>
<19 Bxa7! ...>

19 ... Qxa7
20 Ra6

19 ... Rb7
20 Bd4

<19 ... Kxa7>
<20 cxb5 ...>

White has traded its bishop for three pawns and a huge pawn storm - which looks like a win to me...


click for larger view

~~~

I thought <18 ... b5> was more fun, suicidal, but fun.

Aug-21-15  dTal: The first move is obvious, but the sequence of pawn moves is a bit tricky. I thought of d6 instead of e5 first, but actually that gives time for Black to get his B to c6 and muddy the waters a little bit, eg: 19. d6 ed 20. e5 Bc6 21. ed Qd7 May still work after Qa3 but messier. 21. Qa3 is really a star move, and illustrates the hopelessness of Black' position. I agree that this is potentially easier to see than yesterday's, as the sac of the B to open lines for such a strong attack is something I would probably do without calculating everything in a game.
Aug-21-15  morfishine: I saw the theme but couldn't visualize the correct move-order, namely wanting to put something on <a3> too early :(
Aug-21-15
Premium Chessgames Member
  agb2002: White has the bishop pair for a bishop and a knight.

The black queen defends b7 and the pawn on d6 stops White's d-pawn which blocks the a8-h1 diagonal. Therefore, 18.Bxc5:

A) 18... Qxc5 19.Rxb7 Bb5 (19... Nh6 or 19... Qc8 20.Rxb8+ Q(R)xb8 21.Qxb8#; 19... Qb6 20.Rxb6 + - [Q+2P vs R+N]) 20.Rxb8+ Kxb8 21.cxb5 + - [B+2P vs N].

B) 18... dxc5 19.e5 (19.d6 exd6 20.e5 Bc6)

B.1) 19... Qxe5 20.d6 Bc8 (20... Bc6 21.Bxc6 + -) 21.d7 (21.Bxb7+ Bxb7 22.Rxb7 Qe1+ is a bit unpleasant) looks winning.

B.2) 19... fxe5 20.d6, with the double threat 21.dxc7 and 21.Bxb7+, wins.

B.3) 19... Qc8 20.e6 Bc8 (20... Bxe6 21.dxe6 and b7 is defenseless and the game over) 21.d6 Bc6 22.d7 Qc7 23.Bxc6 Qxc6 (23... bxc6 24.Rxb8#) 24.Rxb7 Qxb7 (24... Rxb7 25.d8=Q+) 25.Qxb7+ and mate in two.

B.4) 19... Bc6 20.dxc6 b6 (20... bxc6 21.Rxb8+ Qxb8 22.Qxb8#) 21.Qa3 and the triple threat 22.Qxa7+, 22.Rxb6 and 22.Qxc5 seems to win. For example, 21... Nh6 22.Qxa7+ Qxa7 (22... Kxa7 23.Ra3#) 23.c7+ Rb7 (23... Qb7 24.Ra3#) 24.c8=Q+ Qb8 25.Ra3#.

C) 18... Nh6 19.Bxa7 is disastrous.

D) 18... b6 19.Be3

D.1) 19... Qxc4 20.Bxb6 Rxb6 (20... axb6 21.Qa3+ Kb7 22.Rxb6+ wins) 21.Rxb6 axb6 22.Qxb6 Qc8 23.Qa5+ Qa6 24.Qxa6#.

D.2) 19... h5 20.c5 looks very bad for Black.

Aug-21-15  Willber G: I went for 18.Ra1 to prepare for a push of the a pawn in order to break through on the a file. I don't know if it will work.
Aug-21-15  Hans Kastorp: <ajile: 21.Ra3 mates in 5. 21.Qa3 only mates in 9.> <aporia: 21. ... a7-a5 won't help?> Whites threat is 22.Qxa7 with following Ra3#. 21. ... a5 doesn't help because of 22.Rb6.
Aug-21-15
Premium Chessgames Member
  thegoodanarchist: Seems like reversal week to me. Monday and Tuesday puzzles should have been switched, and this [Friday] puzzle was easier (for me) than yesterday's.

Can't believe I got this one so quickly, or even at all, considering I am a USCF class A player and so a patzer.

Aug-21-15
Premium Chessgames Member
  johnlspouge: < <ALEXIN> wrote: I thought 18.e5 ?! so missed. >

Interestingly, nobody has yet analyzed 18.e5. Most solutions are therefore probably conditioned on solving a puzzle.

Stockfish shows that 18.e5 permits 18...Bf5, which 18.Bxc4 does not. In this case, there is a specific reason to play the sacrifice without the preparatory move.

Aug-21-15
Premium Chessgames Member
  kevin86: Black is really tied up. The center pawns and the triple forces on the b-file make the game untenable. The pressure will end this one soon in checkmate.
Aug-21-15
Premium Chessgames Member
  beenthere240: I will remember that tactic. Simply point out to your opponent: "You are really tied up. Your pawns are weak and my lineup on the b file makes your game untenable. I suggest you resign before my pressure leads to your checkmate."
Aug-21-15  Pedro Fernandez: It is not difficult (no more than a minute) to see that the only move to get progress is 18.Bxc5! in order to get mobility of the powerful white central pawns (which, in turns, lets to open the diagonal h1-a8 for the dangerous white bishop) since the black king is in a sort of fortress. I did continue my study by playing 18...dxc5 (Stockfish plays here 18...Qxc5) 19.e5!


click for larger view

a natural and very strong move with a few threatens and baneful consequences. But now I did play 19...fxe5? which is immensely inferior than 19...Bc8. Anyways, no doubt that a complete study after the move 18.Bxc5!


click for larger view

is quite complex and extensive.

Aug-21-15  saturn2: Today I failed. My move was 18 Qa3 threatening Qxa7. I wasted some time calculating the defences 18... a6,b6 or Rb8-any.
Aug-21-15  ajile: <Hans Kastorp: <ajile: 21.Ra3 mates in 5. 21.Qa3 only mates in 9.> <aporia: 21. ... a7-a5 won't help?> Whites threat is 22.Qxa7 with following Ra3#. 21. ... a5 doesn't help because of 22.Rb6.>

21.Ra3 a5 22.Qb5! and White will mate in 3 moves.

Aug-21-15  M.Hassan: "Difficult"
White to play 18.?

18.Ra3
Trying to attack a7 square if Black does not support it <18...e6 19.Rxa7+ Kxa7 20.Qa3#>

18...........a6
19.h4 e5 to provide room for Knight move
20.dxe6 Bc6 (not Bxe6)
21.Bf4 Ne7
22.Qd2 Rad8
23.Qe3
Hoping to win a pawn on the exchange
<24.Qxc5 dxc5 25.Bxc7>

23...........f5
24.e5 there is a chance to win a Rook for bishop

24..........Bxg2
25.exd6 Rxd6
26.Bxd6 Qxd6
27.Kxg2
After all the exchanges, white is equivalent of a piece (3points) up and it is time for me to check the actual game. ===

Nowhere near my line

Aug-21-15  Kasparov Fan: The position screams at you 18. Bxc5 got that in 10 maybe 15 seconds but Qa3 took more time and effort.All in all a good puzzle but I guess a little too easy for a Saturday.
Aug-21-15
Premium Chessgames Member
  patzer2: Like <sts> and <diagonally>, I went for 18. Bxc5! dxc5 19. d6? as my attempted solution to Friday's puzzle.

Unfortunately, Deep Fritz 14's analysis proves 19. d6? to be a losing try. After 18. Bxc5! dxc5 19. d6? exd6 20. e5 Bc6! (-3.49 @ 22 depth) Black snatches victory from the jaws of defeat.

Instead of 19. d6?, the game move 19. e5! (+10.52 @ 22 depth) wins as it prepares the pawn push 20. d6 with a powerful discovered attack against the vulnerable b7 square.

Black's not-so-obvious 17...Rb8?? was the decisive mistake. Instead, 17...b6 18. a4 maximizes Black's resistance.

Earlier 9...Qb6 = (or the Fritz choice 9...Nf6 =) instead of 9...Bxc3?! to should improve Black's chances.

Aug-21-15
Premium Chessgames Member
  whiteshark: Got it! After <19.e5 / 20.d6> the ♙b7 is pinned/immobile.
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