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Jan Cervenka vs Jan Netolicky
CSFR-ch corr., qual. group 2018 (1991) (correspondence), rd 5, Oct-07
Sicilian Defense: Fischer-Sozin Attack. Leonhardt Variation (B88)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Aug-01-07  zb2cr: Got this in about 30 seconds.

To <Honza Cervenka>--good job playing this game!

Aug-01-07  dpacaba: If not for the <f3> pawn, black could have played <...Bg3> against <Rg1>. I think this is the one that black missed.
Aug-01-07
Premium Chessgames Member
  Honza Cervenka: <cu8sfan: I know one kibitzer who can boast he solved this one today within seconds, right, <Honza Cervenka>?> Yes, but I must admit that I have seen the game before...:-D
Aug-01-07  bogo78: The black king is exposed. A mating combination should be possible. 22 Bg7+ Here black is already doomed. Declining with 22…Kg8 leads to 23. Bxf6 with the mate treat Rg1 or Qg5. Black can only delay the innevitable with 23..h6, but he better resign here. Back to 22 Bg7. Black is forced to capture, so 22..Kxg7 23 Rg1+ Kh8 24 Qh6 and again mate in 2.
Aug-01-07  Mostolesdude: Whenever I look at a game like this, I get reminded of how basic my chess concepts are. Yes, I try to develop my pieces early, castle (kingside usually), blah, blah, blah, and when i see danger coming, I defend and defend. In the game, there was danger coming to white's camp, but, he sort of ignored such danger. He was willingly giving up material in order to open up attacking lines on the black king. He answered the enemy's threats with threats of his own. I guess white was winning by a tempo as well.
Aug-01-07  YouRang: Got it. The position obviously calls for some action against the somewhat exposed black king, but what?

Taking the rook (22. Bxf8) just leaves black in no real danger (in fact, better off).

We really want our queen to be where our bishop is. Then we can force the king into the corner with Rg1 and mate with Qxf6#. But the bishop is in the way!

Clearly, what's needed is a clearance sac to make room for the queen on h6 without giving black time to respond defensively. And when time is at stake, nothing works like a check: 22. Bg7+!

The sacrificed bishop carries a valuable payload: It forces the king to the g-file where the rook can come into play at g1, and it prevents black from making a defensive move.

Nice work, Honza.

Aug-01-07  blair45: Mostolesdude:<<He was willingly giving up material in order to open up attacking lines on the black king. He answered the enemy's threats with threats of his own. I guess white was winning by a tempo as well.>> It's interesting to note, White gained the tempo by giving up materiel. With one more move, Black could have defended, but after 22. Bg7+, he has to "waste" a move getting out of check.
Aug-01-07
Premium Chessgames Member
  kevin86: The easy line:22♗g7+ ♔xg7 23 ♖g1+ ♔h8 24 ♕h6 with two threats of mate.

Likewise: 22...♔g8 23 ♗xf6 again Δ mate in two ways.

A little easy for hump day.

Aug-01-07  pggarner: <The only tricky line is 22.Bg7+,Kg8; 23.Rg1,Qc5; 24.Qg2,Bh3; 25.Bxf6+,Bxg2; 26.Rxg2X. And 23.Rg1 might not even be the best win here.>

It seems to me that after 23...Qc5, White has 24.Rg3 which renews the threat with no more answers from Black.

Aug-01-07  willyfly: it's over easy Wednesday - White is down the exchange ♖ for ♘ - Black has an additional ♙ but it is a twin - the LS♗s are faced off - I am drawn right away to the g-file corridor where things are somewhat cramped and it might be possible to mate the Black ♔ - White's ♕ and ♖ can easily access this area and the ♗ is already there and can give check at will - let's try that

21 ♗g7+ ♔xg7
-if 21...♔g8 then 22 ♖g1 or ♕h6
22 ♖g1 ♔h8
-if 22...♗g4 then 23 ♖xg4+ ♔h8 24 ♕h6
23 ♕h6 ♖g8
24 ♕xf6+ and it looks quite grim for Black - is this it? - let's see

-----
haha - got the first move right - anyway!

Aug-01-07  Magic Castle: <pgarner> I saw 23. Bf6 as a crushing refutation to 22. ...Kg8, with at least 3 threats of mate in two.
Aug-01-07  TrueBlue: way too easy, even for someone like me ;)
Aug-01-07
Premium Chessgames Member
  playground player: Way to go, Honza! Black was right to resign. After...Kxg7, 23.Rg1+, Kg8 24. Qh6, and it's all over. The White Queen can mate either by Qg7 or Qxf6: Black can't defend both squares at once.
Aug-01-07  Crowaholic: 22. Bg7+ Kxg7 23. Rg1+ Kh8 24. Qh6! immediately occured to me. I saw that Black can sacrifice the exchange with 23. ..Bg4 24. Rxg4 Qxg4 25. fxg4 to stop the mate, but White is still winning. Finally, I considered what happens if Black declines the sac, and Bxf6 immediately struck me as a powerful refutation that leaves Black with nothing but a few desparation checks. All in all, this felt more like a Tuesday puzzle.
Aug-01-07
Premium Chessgames Member
  gawain: I'll weigh in just to say that I solved this one very quickly. Open g-file for White, black pieces in each other's way. Pawn at f7 seals off any route from which help might have come.

Why did B not settle for the rather obvious defensive move 21...Rg8 instead of the losing Be6? Because he was greedy I think. He just did not want to give back the material.

Aug-01-07  soberknight: I almost gave up before I saw this move. The weakness on f6 turns out to be critical.
Aug-01-07
Premium Chessgames Member
  marcwordsmith: HEY WAIT!
Can't Black hang on here???

22.Bg7+ Kxg7 23.Rg1+ Bg4 24.Rxg4+ Qxg4 25. fxg4 and material is about even and there is no mate threat.

WHAT AM I MISSING????

Aug-01-07  vibes43: I consider it an honor to be posting a message on the same board as did Jan Cervenka. Thanks, Jan, for sharing your comments here.
Aug-01-07  mrbiggs: <marcwordsmith> white is up a bishop.
Aug-01-07  beginner64: Much easier than Monday or Tuesday. Seems like last week to me. Got this in about 3 seconds, and spent about 20 seconds double checking it.

I am genuinely confused about the difficulty of this puzzle, perhaps there is no such universal notion.

Aug-01-07  aazqua: Uh, I solved this one withing seconds. There aren't any other possible moves that lead to a finish. Isn't this one trivial?
Aug-01-07  unferth: <marcwordsmith: HEY WAIT!
Can't Black hang on here???

22.Bg7+ Kxg7 23.Rg1+ Bg4 24.Rxg4+ Qxg4 25. fxg4 and material is about even and there is no mate threat.

WHAT AM I MISSING????>

as mrbiggs noted, Q+B vs. 2R is not "about even" ... white's nearly a full piece up. in an OTB game, black might reasonably choose to make white prove the win--but in correspondence, it'd be something of an insult to play on.

Aug-01-07
Premium Chessgames Member
  ajk68: 18...Qc8 was a misktake.

I think 18...Bb5 keeps things pretty even?

Anyone have a computer available?

Aug-02-07  patzer2: For yesterday's puzzle, the demolition of pawn structure combination 19. Rxf6!! sets up the neat solution and finish with 22. Bg7+!

If 22...Kxg7, then 23. Rg1+ Kh8 24. Qh6 wins.

Aug-13-07
Premium Chessgames Member
  Honza Cervenka: <ajk68: 18...Qc8 was a misktake.

I think 18...Bb5 keeps things pretty even?>

I think that 18...Bb5 19. Qd2 Qe7 20. c4 gives white some edge. Black could have played also 18...Be7 with idea to keep his Ks intact and to start his own attack on the Qs after 19.Rxa6 which seems to be quite forced here. But 18...Qc8 was still okay and only 21...Be6 lost the game. Instead of that by returning of material via 21...Rg8! 22.Bxf7 Be6! black probably could have kept equality. My earlier suggestion 22...Rg6 is not so good for 23.Bxg6 hxg6 24.Rg1!? Qe8 25.Bf8!? (this move in several lines I did not see at the time the game was played) 25...Qxf8 26.Qxd7 and black still faces problems. Also 24.Qd6 can be quite tricky here, for example 24...Be6 25.Qe7 Qg8 26.Bg7+! (I analyzed only 26.Qxf6+ Kh7 27.Be3 Bxa2+ 28.Kxb2 Rb8+ with no clear conclusion) 26...Qxg7 27.Qxe6 gives white advantage and also 24...Kh7 25.Bf8 Qxf8 26.Qxd7+ can give white solid winning chances.

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