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Anthony Cornelis Kosten vs Murray Chandler
Hastings (1990/91), Hastings ENG, rd 13
Sicilian Defense: Lasker-Pelikan. Sveshnikov Variation Novosibirsk Variation (B33)  ·  0-1
ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Dec-24-08  MaxxLange: Is 12 Bd3 just bad in this line? White got rolled quickly. Or does he go wrong later, maybe with 16. Re1?
Dec-24-08
Premium Chessgames Member
  johnlspouge: Wednesday (Medium/Easy)

A Kosten vs Chandler, 1991 (33)

Black to play and win.

Material: Down, a P for N with Bs of opposite color. The White Kg1 is stalemated. Black has an amazing attack, with a possible double check gxf2+ exposing Rg7 against Kg1. Both Be5 and Qh3 active against Kg1. White has defensive resources with the battery Qb3 and Rc3 covering the 3-rd rank and Rf7 covering Pf2, but given Blacks local superiority in the K-position, it is impossible to believe he can survive a sacrificial attack. The Black Kh8 is open to checks Rc8+ or Rf8+, but the Black Rb8 defends the back-rank adequately.

Candidates (33): gxf2+

I went for 33gxf2+, seeing it through to an obvious winning position where mate seemed likely. Habitually, I miss Q decoys.

< <agb2002> wrote: A continuous application of the most forcing move approach >

Message received: I should look at the consequences of giving away my Q occasionally ;>)

< <Peligroso Patzer> wrote: Chandler's line is certainly the most elegant and must be considered the "correct" puzzle solution, but the deficiency with this position as a puzzle is that almost any reasonable move wins for Black. >

Agreed.

Toga II 1.3.1 gives 33Qh1 as mate-in-4, 33gxf2 as mate-in-10.

There is a nice finesse with a zwischenzug in the 33gxf2+ variation, however:

33gxf2+ 34.Kxf2 Rg2+ 35.Ke1 <Qh4+>

Granted, the game finish is nicer.

Dec-24-08  bennytschet: Didn't get it....I settled for 33...RxR where white can't recapture the rook because of 34 Qh2+ Kf1 35. Qf2#.
Dec-24-08  griga262: < <battleaxe> wrote: I dont understand, why not just the simple

33. gxf2+ 34. Kxf2 Rg2+ 35. Ke1 Qh1# ??

Its all forced.>

After 35. .. Qh1, the white can reply with 36. Rf1. However, it is still in a heap of trouble.

Dec-24-08  braimondi: Well I got the line 33...Qh1 because when I was analyzing 33...gxf2+ I didnot see 35...Qh4+
Dec-24-08  ZUGZWANG67: After a "subtle fuzzy tuesday puzzle", here is a "mechanical" one for wednesday.

The mate threat here is obvious. My first candidate move was 33. ...gxf2+ when 34. Kxf2 is forced. But after 34. ...Rg2+ 35.Ke1 Qh1+, White has the annoying 36.Rf1.

One of the problem Black must face is the fact that after the advance of the black g-pawn, the BQ comes under attack, which decreases the number of Black' s options against the WK. And the placement of the BQ here is crucial, as it cuts off the WK from the Q-side. Then, I saw the Q sacrifice at h1, in conjonction with the advance of the black g-pawn, forcing the WK on the K-side.

Thus, 33. ...Qh1+ 34.Kh1 g2+ 35. Kg1 Bh2+ 36.Kxh2 g1Q+ 37.Kh3 Qh1 mate. When the g-pawn comes to g2, it takes care of the duty of preventing the WK to escape via f1. This was the obscur part to find.

Let' s see

Dec-24-08  backyard pawn: While I missed Chandler's beautiful finish, I did manage, a forced mate beginning with 33....,g2.

34. f4, Qh1+
35. Kf2, Qf1+
36. Ke3, g1=!+
37. Kd2, Qgf2#

Did I miss something through the bloodshot eyes of my raging headcold?

Dec-24-08  ZUGZWANG67: <backyard pawn: While I missed Chandler's beautiful finish, I did manage, a forced mate beginning with 33....,g2. 34. f4, Qh1+
35. Kf2, Qf1+
36. Ke3, g1=!+
37. Kd2, Qgf2#

Did I miss something through the bloodshot eyes of my raging headcold?>

34.Rxh3 ;)

Dec-24-08  backyard pawn: <Did I miss something through the bloodshot eyes of my raging headcold?>

I guess I did -- a quicker mate:
33....,g2.
34. f4, Qh1+
35. Kf2, g1=Q+
36. Ke2, Qhg2#

There are a couple of meaningless checks white could insert in response to 33..., g2, but once they run out, he's cooked.

Dec-24-08  backyard pawn: <ZUGZWANG67 34.Rxh3 ;) >

Brilliant! ;(

Time to rest my embarrassed, throbbing head.

Dec-24-08  ZUGZWANG67: <backyard pawn: <ZUGZWANG67 34.Rxh3 ;) > Brilliant! ;(

Time to rest my embarrassed, throbbing head.>

These things happen, once an awhile. One calls that "a blunder". But it could have been worse ! It could have happened OTB. :)

Peace !

Dec-24-08  Patriot: There seemed to be too many winning ideas that I completely missed Qh1+.

My candidates were gxf2+, Qh2+, and Rxf7. I went with Qh2+ as simplest.

33...Qh2+ 34.Kf1 Rxf7

A) 35.Rxg3 Qxf2#

B) 35.Rc2 Qh1+ 36.Ke2 Rxf2+ 37.Ke3 Qf3#

C) 35.Qc2 Qh1+ 36.Ke2 Rxf2+ 37.Ke3 Qf3#

D) 35.Rf3 Rxf3

E) 35.Bxf7 Qxf2#

Dec-24-08  njchess: Today's puzzle is an example of why it pays to practice endgame mating positions.

This is an example of a similar practice position.

Black to move. Mate in four.


click for larger view

In this example, gxf2 stalemates, and any other move besides g2 allows the White king to escape.

Given the example above, I don't need to analyze gxf2 because I already know that I just need to limit the movement of White's king. Therefore, I should play 33. Qh1+ and mate is forced in five (not four since Black cannot play his rook to the h-file).

This game is an example of the sharp Sicilian Lasker-Pelikan aka Sveshnikov variation characterized by 7. ... e5, which leads to the Novosibirsk Variation as delineated by 10.Bxf6 gxf6 11.Nd5 Bg7!? (as opposed to the sharp f5).

c3 is also playable to 12. Bd3 and the two often transpose. <MaxxLange: Is 12 Bd3 just bad in this line?> No, its a normal move meant to deter Black from playing f5.

With the opening concluded, White begins an immediate, speculative attack by 15. c4!?. Usually, White proceeds with a king side attack involving f4, Qf3, Qg3 etc., while Black seeks counter play on the queen side. Better would have been c3.

Black counters with 15. ... f5 and by 21. ... e4!, White is in serious trouble. His attack has fizzled and after 22. Qb3 Be5, Black's position is better.

23. ... Bd7 appears to just attack the knight, but it's true intent is to allow Black to play Rg8. 24. ... Qe8! is an extremely subtle move. Like the previous move, the intent appears to be to attack the knight forcing White to defend it. However, it's deeper motive is to put the king on the e8-h5 diagonal preparing for the king side assault. The immediate Qh4 loses tempo after g3.

26. h3? is less accurate than g3 (made even more obvious by 28. g3). 27. ... Rg8! appears to lose the rook, but Black isn't worried about losing material at this point.

White is now in a difficult and losing position. 29. Rc7?, 30. Rec1? may have been an attempt to bluff or confuse Black. But, Black is undeterred, and while 31. R1c3 over R7c2 lets White keep his queen, it overlooks a pretty end mate.

Dec-24-08  MaxxLange: <njchess> thanks!
Dec-24-08  eaglebroadwinged: MATE IN 3: 1.....gxf2; Kxf2,Rg2+; Ke1(f1), Qh1+
Dec-24-08
Premium Chessgames Member
  johnlspouge: < <eaglebroadwinged> wrote: MATE IN 3: 1.....gxf2; Kxf2,Rg2+; Ke1(f1), Qh1+ >

Hi, <eaglebroadwinged>. This is the first time you have kibitzed. Welcome to the neighborhood!

The variation you give was definitely the first to catch my eye, but it does not quite work:

33gxf2+ 34.Kxf2 Rg2+ 35.Ke1 Qh1 36.<Rf1>

The chess program Toga II 1.3.1 evaluates Black at the equivalent of about 2 Ps. The zwischenzug 35...Qh4+ (see my post below) leads to a direct mate.

Please do not be discouraged. We all make mistakes, and people kibitz here to learn. (Well, most of us do, at least :)

Dec-24-08  beginner64: Nice enough! I noticed that Rf7 is really en prise as recapturing with bishop leads to a quick mate on f2.

Then, I noticed that if g pawn can queen with the king on h file, the mate will follow. That leads to Qh1+, with a sequence of very forcing moves leading to a 4 move mate.

Even after 33.. Rxf7, whites best move seems to be 34. Rxg3 Bxg3 35. Qxg3, which loses another exchange and allows the exchange of queens, but removes the dangerous g pawn and saves the game for a few more moves. Pretty much any other move (other than Rxg3) allows the g pawn to queen.

Dec-24-08  xrt999: Here is what I came up with. Even though this line is forced, I was thinking as I was playing it that it must be wrong, since this is Wednesday!...

33. Rf7 gxf2+
34. Kxf2 Rg2+
35. Ke1 Qh4+
36. Rg3 Bxg3+
37. Rf2 Bxf2+
38. Kd2 Bd4+
39. Kc1 Qh1+
40. Qd1 Bxb2+
41. Kb1 Qxd1+
42. Ka2 Qxa4+
43. Na3 Qxa3+
44. Kb1 Qa1#

Dec-24-08
Premium Chessgames Member
  DarthStapler: Is there anything wrong with gxf2+ Kxf2 Qh2+ Ke3 Rg3+ Rf3 Rxf3#?
Dec-24-08
Premium Chessgames Member
  DarthStapler: Nevermind, I found the problem
Dec-24-08  TheaN: Bizarre position, where I just evaluated Rxf7 (and probably gxf2 with some more thought) and a winning position. I have to agree that that is not worth a point as White can deviate after Rxf7: of course 34.Bxf7 Qh2 35.Kf1 Qxf2... but Black is just up an exchange after Rxf7. But the troubles are not yet gone, and Black will win. Qh1 is very nice though.
Dec-24-08  Zzyw: Went with 1... Qh2+ 2. Kf1 Rxf7 and surely white will resign. Flawed puzzle imo.
Dec-24-08  Amarande: <xrt999> Ah well, I managed to overlook something simpler, though it's at least a working mate ...

After 36 Kxh2 g1Q+ 37 Kh3, I thought that it was then a mate in two moves: 37 ... Qg2+ and 38 ... Qg4# (or vice versa). I didn't see 37 ... Qh1# for another moment ...

Dec-25-08
Premium Chessgames Member
  Richard Taylor: <goodevans: <Richard Taylor ... he calculates very deeply> Yes, and he also thinks very fast: When I played him he was taking 15 to 30 seconds on each board, but since there were about two dozen boards I was getting a reasonable amount of thinking time ... to start with...>

You did well! I simply blundered but I couldn't think as fast as him - actually I don't like playing in simuls

He also edited the BCM and writes chess books (and is the manager of Gambit Books - I have a few of them - they are often very good) - yes in the 80s he was one of the best in the world and still plays pretty well. Some of his other games have featured on here - wins and losses.

Jul-29-13  sleepyirv: "Farewell, My Lovely" is a Philip Marlowe novel by Raymond Chandler and describes the winning tactic very well.
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