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Valery A Chekhov vs Michael Hoffmann
Biel op (1994), Biel (Switzerland)
Sicilian Defense: Dragon. Classical Variation General (B72)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Oct-14-12
Premium Chessgames Member
  SuperPatzer77: <Abdel Irada: <SuperPatzer77>: It's not clear to me how Black has improved his position after 31. Qxc3, Rxf1; 32. Kg2, Rg1; 33. Kh3, Rc1; 34. Qb2, Rc8; 35. Bh8, when White continues fighting for several more moves. I think the 32. ...Rf2 idea still wins faster and more cleanly. >

34. Qb2 fxg4+!, 35. Kh4 Rc8, 36. Bh8 Kf8!, 37. Qg7+ Ke7, 38. Qxh6 d1=Q (White runs out of the queen checks)

SuperPatzer77

Oct-14-12
Premium Chessgames Member
  Abdel Irada: <SuperPatzer77>: Note that in your most recent line, White does not play 38. Qh6 but 38. Qf6. Black does escape the checks (with 38. ...Ke8) and queen, obtaining a clearly winning position, but not until move 39. This is five moves slower than the line I advocated.

I hasten to add that a win is a win, so your solution is not "wrong." It simply seems to me that it's a bit slower than 32. ...Rf2. (But that won't be much consolation to White when he signs the scoresheet.)

Oct-14-12  Patriot: <SuperPatzer77> Thanks for the input! You're right that 30...Rxd4 looks better. At the time I thought both look winning and didn't go any further. The question here is, "Is either one critical?" I didn't think they were so I stopped there.

One move that is critical is <29....Rxe1 30.Bxf6 d2 31.Qxc3> as <Steve.Patzer> pointed out. I briefly looked at it and didn't fully appreciate it's threat. So it is a very critical move.

Oct-14-12  PinnedPiece: Had fun playing through and guessing black's responses from about move 15 on. Got quite a few of them right, and was willing to trade my queen from about move 27..? on, holding the pawn majority and upper hand.

With move 29.Bd4 I told white "Right bring it on!" and took his Rook on e1 without a great deal more thought. This is the kind of situation you wait for in these puzzles. Since I knew something like this led to a black victory, it was easy for a Sunday.

In a real competition with sweat in my armpits, I most definitely would not have been so cavalier....(nor could I have reached the critical position in the first place!)

When solved, these puzzles are nice for restoring self-confidence after devastating losses, no?

.

Oct-14-12  Abulherar: The ♕ sac (29...♖xe1!) looks good to me:
A)30.♖xe1? ♕xd4
B)30.♗xf6 ♖xf1+ 31.♕xf1 ♗xf6....
with:♕ vs ♖+♗+passed ♙ on the d-file....
i think that black has the upper hand!
P.S:it took me 12 minutes to solve this one!!
Oct-14-12
Premium Chessgames Member
  Jimfromprovidence: If black plays 32...Rf2+ instead of the text 32...Rg1+ and white responds with 33 Kxf2, this is the position.


click for larger view

It's black to play and win. it's not difficult, but it requires one finesse move by black.

Oct-14-12  soberknight: Astonishing.
Oct-14-12  Amarande: 29 ... Rxe1 was the gut feeling, and gives another one of those "Whoa, this was Sunday?" feelings in turn.

30 Bxf6 is obvious, after which I missed the game continuation, but it doesn't seem like it really matters. Apart from one or two perpetual check gotchas, Black's game is just that powerful that after the key-move, it's really a mopping-up operation in any case.

I did check further to see if my move had any problems, but (as other posters have noted as well), it didn't take the silicon to find that 30 ... Rxf1+ wins painlessly. After 31 Qxf1:

31 ... d2 32 Qd1 Bxf6 and it's clear it's all over but the shouting. As d2 is a black square and can be supported by the B, Black has only to guard the pawn and swing the Rook around to move to c1 or e1 for the kill. White meanwhile can't take the Queen away from d1 and thus has no counter at all.

31 ... d2 32 Bxc3 d1Q 33 Qxd1 Rxd1+ draws out the agony a little longer, but White is still without resource in this B v. R endgame.

31 ... Bxf6 would be a little inexact, but not by much: 32 gxf5 Kf8! (not 32 ... d2?? 33 Qg2+ and White has the last laugh) and White will still soon succumb in similar fashion to the above.

Oct-14-12
Premium Chessgames Member
  gofer: If we count up bits we can quickly see that black is three pawns up! One of which is on the third rank! So in the long-term at least this should be a clear win for black. But how best to translate this position into a won endgame?

My simplest proposal would be to swap off "Q+R" for "2R+B" leaving "R+B+3P" v "Q".

<29 ... Rxe1!>

A huge <GOOT>, leaving Qf6 en-prise, so what can white do? Well taking the queen loses!

30 Bxf6 d2!!

31 Qh6 doesn't work due to Rxf1+ 32 Kg2 Rg1+, where white has choice of taking Rg1 allowing d1=Q+ or not taking Rg1 and allowing either Bxf6 or Rxg4 either of which are winning

31 Bxc3 Rxf1+
32 Qxf1 d1=Q
33 Qxd1 Rxd1+
34 Kg2 fxg4
35 Bxa5 Ra1

So that just leaves...

<30 Rxe1 Qxd4>
<31 Re8+ Kg7>
<32 g5! Qe4+!>
<33 Rxe4 fxe4>

Black trades Q for R, but moves into a won endgame, as white has no way to stop the black pawns!

~~~

So yesterday and today were a little too simple for our normal weekend fare!!!

Oct-14-12
Premium Chessgames Member
  chrisowen: Bold maneovres called for as put rookxe1 green gauge it lock in he

it her B in f6 white bishop and queen threat in g7 can be easily

parried if a rook gets to the gline or c3 takes f6 just be careful

of the perpetual ones thinking at enact in g5 d8 diagonal so after

f6 then d2 to bolster e1 or set up a promotion at e1 d1. Is h6 going

to mate me now since e1xf1+ king step up petal it defence in

sacrifice g1 or f6 both lead to investigate:

32.Kg2 Bxf6 33.Qxf6 h6! creating luft and white has know solution

for d1Q in.

32.Kg2 Rg1+ 33.Kf2 again white could interpose a bxf6 33...Rxg4 the

net is complete mate lurks in the wings everything covered so white

has to chuck it in,

One for big bertha rooks are too dominanting too infiltrate kings

position rewinding back to 13th white goes wrong with nc3 d5

allowing black to free his position by pe5 to e4 claw back knight b4

queend2 little feint getting queen offside line I ate ground rook

tables right off it snatch in e1 fairly easy demolition again i cold

demonstrate rook queen sac working bottle neck to fly it pawn too

strong reaching back rank together hoping mate in g7.

Oct-14-12  James D Flynn: In the game what if 31.Qxf3 Rxf1+ 32.Kg2 Rg1+ 33.Kh3(if Kf2 d1=N+ 34.Kxg1 Nxf3 35.Bxf3 fxg4 and Black is the exchange and 3 pawns up with an easily won endgame)Rc5 (if Rd3+ (not d1=Q Qc8#) 34.Qxd3 d1=Q 35.Qxf5 and Whites K has many escape squares and his Q threatens mate immediately and if it gets to e4 on both a8 and e8) Qxd2 and White with B and Q versus 2 Rs and 2 pawns should win the endgame.
Oct-14-12  BOSTER: I like <Once> & Fritz classic analysis in "movie" style, written by a series of diagram, where the game can be followed from the text, examining just as many variations as necessary- no more , no less.

And the picture to enjoy.
Black to move.


click for larger view

Oct-14-12
Premium Chessgames Member
  DarthStapler: I picked Rxf1+ instead
Oct-14-12  francis2012: Not so difficult this puzzle of the day. I will choose <♖xe1!>. If ♗xf6 then Black continues with 2. ...♖xf1+ 3. ♔g2 d2
Oct-14-12  stst: The RxR+ is too much for Black, so one course would be to eliminate this threat, despite sac. the Q: 29..... Rxe1
30.Bxf6 Rxf1+
31.Qxf1 Bxf6
32.gxf5 Kf8 (to avoid Qg2+ snatching the R)
33.Qf3 Rd4
34.Qa8+ Ke7
35.Qa7+ Kf8
36.Qxa5 d2 (threatens to promote)
37.Qa8+ Kg7
38.Qg2+ etc, initiating a perpetual check to draw.
See if Black could do better...
Oct-14-12  rilkefan: My line, 30... Rxf1+ 31. Qxf1 d2 32. Qd1 Bxf6, seems easily won.
Oct-14-12  James D Flynn: I did not see my posts in either the either earlier or later Kibitz posts so I am combining them and re-submitting. I did see a reference to the later after game post continuation Qxc3 but with no analysis.

Black is 3 pawns up one of which is advanced and passed, but his Q is under attack from the B on d4 and his R on e8 from White R on e1, in this melee it appears unlikely the issue will be decided in the endgame. The White offensive pieces are in turn under attack the d4 B by the Q, the R on d5 , and the B on c3. Clearly Black can limit his material loss to the exchange by taking the B on d4 and conceding the back rank with check.. His could also sac his Q in exchange for R and B by 29.Rxe1 30.Bxf6 Rxf1+ 31.Qxf1 Bxf6 in both cases we have un endgame with unbalanced material and the Black pawn majority may count, Black can also try limiting his loss by R(either) to e5 but that will lose the B on c3. There is also the possibility of just dropping the Q while promoting the d3 pawn by 29..Bxe1 30.Bxf6 d2 and Black will have a new Q but apparently too late because 31.Qh6 will mate next on g7. Candidates 29. Rxe1.Qxd4,Rd4.
29.Rxe1 30.Bxf6 Rxf1+ 31.Qxf1 Bxf6 32.gxf5(threat 33.Qg2+ K moves 34.Qd5) Rd4 33.Qa8+ Kg7 34,Qg2+)Bg5 33.Qg2 Rxf5 34.h4 d2 and the Black pawn will queen unless the Whit Q sacrifices itself to take it leaving Black with a winning material advantage.

In the game what if 31.Qxf3 Rxf1+ 32.Kg2 Rg1+ 33.Kh3(if Kf2 d1=N+ 34.Kxg1 Nxf3 35.Bxf3 fxg4 and Black is the exchange and 3 pawns up with an easily won endgame)Rc5 (if Rd3+ (not d1=Q Qc8#) 34.Qxd3 d1=Q 35.Qxf5 and Whites K has many escape squares and his Q threatens mate immediately and if it gets to e4 on both a8 and e8) Qxd2 and White with B and Q versus 2 Rs and 2 pawns should win the endgame.

Oct-14-12  M.Hassan: I saw the first move:

29...........Rxe1
30.Bxf6
but never saw the excellence of 30....d2

No credit

Oct-14-12  FlashinthePan: <Jimfromprovidence> Is the finesse 34...h6, after the forced 33...Bxf6 34.Qxf6, in order to prevent perpetual chess?
Oct-15-12  Dr. J: Disappointing puzzle, as there are so, so many ways to win this. Here's another: After White's 32 Kg2 instead of 32...Rg1+, Black can play 32...Bxf6 33 Bxf6 fxg4! and there is no perpetual.
Oct-15-12  newzild: <BOSTER>

1...Qf6 forks the Qg7 and Rb2. If 2. Qxf6 then 2...Rg8+ mates quickly.

Oct-15-12
Premium Chessgames Member
  Jimfromprovidence: <Flashinthepan> <Is the finesse 34...h6, after the forced 33...Bxf6 34.Qxf6, in order to prevent perpetual chess?>

Yes! You found the most difficult of the two winning moves; the other is 34...fxg4, below.


click for larger view

The point was to keep the queen off of g5.

Oct-15-12
Premium Chessgames Member
  Abdel Irada: *That's* our problem here: "perpetual chess." No wonder I can't get my work done!
Oct-15-12  FlashinthePan: <Jimfromprovidence> <Yes! You found the most difficult of the two winning moves; the other is 34...fxg4, below.> Thanks! The other one you mention is better, and, to be honest, I didn't see it.
Oct-15-12  FlashinthePan: <Abdel Irada: *That's* our problem here: "perpetual chess." No wonder I can't get my work done!> Slip of tongue after a long night's work...
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