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Stanislav G Kriventsov vs Alexander Stripunsky
Chessmaster US Championship 2005 (2004), San Diego, CA USA, rd 2, Nov-25
Sicilian Defense: Kan. Polugaevsky Variation (B42)  ·  0-1

ANALYSIS [x]

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sac: 28...Rd3 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jan-22-05  thorndeux: hmm - i don't seem to understand this. what about Rfe1? or the other rook, even? and Nc5 is just one move away. e.g. 29.Rfe1 RxR 30.RxR Rd3 31.Re1 Nd6 32.Nc5 and white seems to be fine, maybe loses the b-pawn. what am i missing?
Jan-22-05  ArmyBuddy: 27 Qe3. White would've won or drawn the game if it weren't for that move
Jan-22-05  patzer2: Black's 28...Rd3! combines the deflection and pin tactic for decisive effect. A detailed analysis follows:

28...♖d3! 29. ♖fe1

[(A) 29. Re2 Nd6 30. Nbc5 Bxe4+ 31. Nxe4 Nxe4 32. Rxe4 Rd2 33. b4 Rc2 34. Re3 Rdd2 35. Rh3 h6 36. Ra1 Kf7 37. Re1 Ke7 38. Kg1 Kd6 39. Rg3 Kd5 40. Rh3 Kc4 41. Re4+ Kb3 42. Kf1 Rd1+ 43. Re1 Rxe1+ 44. Kxe1 Rxc3 45. Rh4 Rc4 46. Rh3+ Kxb4 ;

(B) 29. Rxd3 Bxe4+ 30. Kg1 (30. Rdf3 Rd1! 31. Kg2 Rxf1 32. Kxf1 Bxf3 33. Nc5 Bxg4 is the winning game continuation) 30...Bxd3 31. Rd1 Rd5 (an easier win is 31...e4 ) 32. Nc5 Rxc5 33. Rxd3 Ne7 34. Kf2 Nc6 35. Kf3 Kf8 36. Ke2 b4 37. cxb4 Rc2+ 38. Rd2 Rxd2+ 39. Kxd2 Nxb4 ;

(C) 29. Nbc5 Rxe3 30. Nxb7 Rd5 31. Ng3 Nd6 ]

28...♖d3! 29. ♖fe1 ♖xe3 30. ♖xe3 ♖d1+! [also winning are 30...Nd6! and 30...Rd3! ] 31. ♔g2 ♘d6 32. ♘bc5 ♗xe4+ 33. ♘xe4 ♘xe4 34. ♖xe4 ♖d2+ 35. ♔f3 ♖xb2 36. c4 ♖b3+ 37. ♔e2 ♖b4 38. ♔d3 ♖xc4 39. ♖xc4 bxc4+ 40. ♔xc4 g6

Jan-22-05  patzer2: <Thorndeux> <What am I missing?> In your line, after <29.Rfe1 RxR 30.RxR Rd3 31.Re1 Nd6 32.Nbc5>, play continues 32...Bxe4+ 33. Nxe5 Nxe5 34. Rxe5 Rd1+ 35. Kg2 Rd2+ 36. Kf3 Rxb2, where Black with two extra pawns and two isolated weak Black pawns available as targets will easily win. Note also that Black here can play the intermediate move 30...Rd1+, gaining tempo for the winning line given in my post above.
Jan-22-05
Premium Chessgames Member
  kevin86: Nice combination by black!! His slight-of-hand gains him a piece-and the peace that winning offers.
Jan-22-05
Premium Chessgames Member
  Gypsy: <  notsodeepthought: <Gypsy> You scooped me... :) > Worry not; such parallel postings are just part of the great banter around here...
Jan-22-05  white pawn: Yay I got this one today :-D. I didn't see the entire way through, but I saw the gain in material. Very good game. And <Shah Mat> don't tell me it's Friday, when it's really Saturday, ever again. When I read your post I was like, "Oh no! I'm supposed to be at work!"(I jus woke up) :-p
Jan-22-05  Shah Mat: <white pawn> hahah sorry to put a scare into you.

the chessgames server is somewhere east of me, so in my timezone the new puzzles are up late friday nights; when i posted, the clock on my computer said it was friday...i forgot that it actually the saturday puzzle.

Jan-22-05  GreenDayGuy: What about 29. Rfe1? It holds the rook and protects the knight, and after black moves, white can move his king out of the pin.
Jan-22-05  Hossam Hassan: GreenDayGuy: after 29.Rfe1 there is 29...Rxe3 30.Rxe3 Nd6 31.Nbc5 Bxe4+ 32.Nxe4 Nxe4 33.Rxe4 Rd1+ 34.Kg2 Rd2+ 35.Kf3 Rxb2
Jan-28-05  hkannan2000: <Gypsy> After 30 Nbc5, ...Rh3! with same threates. White's Kt is pinned, the R at e2 will have to move to e1 when the other Black rook can (even though after preparation) intrude into whites 2nd rank. May not be fool proof. But i think Black is better.
Jun-02-17  Walter Glattke: 29.Rfe1 or 29.Nbc5, 29.Rxd3 is a "patzer" a mistake.
Jun-02-17  Walter Glattke: General Change and won ending with:
29.Rxd3 Rxd3 30.Re1 Nd6 31.Nbc5 Rxe4+
32.Nxe4 Nxe4 33.Rxe4 Rd2 34.c4 Rxb2
35.c5 Kf7
Jun-02-17  stst: This should gain a piece:
28..............Rd3
IF (A)
29.RxR BxN+
30.Rf3 Rd1+
31.Kg2 RxR
32.KxR BxR
IF (B)
29.Re1 RxR
30.RxR Rd1+
31.Kg2 Nd6
32.Kh3 NxN
... other variations possible, but Black got advantage anyhow....
Jun-02-17  Moszkowski012273: Ummmmmm.... Friday?
Jun-02-17  morfishine: <28...Rd3> is a nice invasion that seemed to rattle White into an inferior response

<29.Rfe1>, <29.Ree1> or even maybe best of all <29.Ree2> are all better moves with White basing his final strategy on an eventual <Nbc5>

*****

Jun-02-17  ChessHigherCat: I thought this was much easier than the Th. or even the W puzzle. I saw the 28...Rd3 trick within a minute (after vainly toying with some of the other ways of exploiting the pin). Almost geometrical with the triangle theme.
Jun-02-17
Premium Chessgames Member
  whiteshark: Attacks n pins
Jun-02-17  gofer: Well, I can only suppose that this one is one of those POTD where the losing side chose the wrong defence. I can see a "simple" sequence that nets a whole pawn, but nothing more. BUT if white falls for a cheap trick then he loses a whole piece!

<28 ... Rd3>

29 Rxd3? Bxe4+
30 Rdf3 Rd1!!!

But white isn't going to fall for this. They will simply protect Re3 because giving up Re3 seems a little bit unwise...

29 Nc5? Rxe3
30 Nxb7 Rd7
31 Nbc5 Rd5

Black ends an exchange up...

<29 Rfe1 ...>

At which point things get interesting...

<29 ... Rxe3>
<30 Rxe3 Re1+>
<31 Kg2 Nd6>
<32 Nc5 Bxe4+>
<33 Nxe4 Nxe4>
<34 Rxe4 Rd2+>
<35 Kg3 Rxb2>


click for larger view

Hooray! We have won a whole pawn!

~~~

Yep. Based on what <Patzer2> wrote I am pretty close to the right answer...

Jun-02-17  Pasker: Easy one. May be I was expecting that kind of quiet preparatory moves instead of sacrifices in a typical Friday puzzle.
Jun-02-17  Walter Glattke: Gofer, I propose 30.-Nd6 31.Nbc5 Bxe4+
32.Nxe4 Nxe4 33.Rxe4 Rd2 34.Re1 Rxb2
35.Rd1 Ra2 36.Rd8+ Kf7 37.Rd7+ Ke8
38.Rxg7 Rxa5 39.Rxh7 Ra3 40.Ra7 a5
Jun-02-17
Premium Chessgames Member
  PawnSac: < ArmyBuddy: 27 Qe3. White would've won or drawn the game if it weren't for that move >

well i'm not so sure about that, although i certainly agree Qe3 was a loser. The queen trade allows black to exploit the pin. But even apart from Qe3 white has a difficult position.

Black has a clear positional advantage in the two long diagonals (a7-g1 & b7-h1) plus the rooks on the open file. The x-ray attack of the LSB is particularly dangerous, so my first thought was to get the king off that diag with perhaps h3 and Kh2, or Kg2-Kg3, but that may be too slow, so white's best may be Nbd2 to reinforce the pinned knight. But it still appears a hard uphill climb to a draw.

Jun-02-17  ChessHigherCat: <Gofer:

<<29 Rfe1 ...>

At which point things get interesting...

<29 ... Rxe3>
<30 Rxe3 Re1+>
<31 Kg2 Nd6>
<32 Nc5 Bxe4+>
<33 Nxe4 Nxe4>
<34 Rxe4 Rd2+>
<35 Kg3 Rxb2>

Your line starts out like the one I was expecting but I thought black would repeat the same Rd3 trick:

<<29 Rfe1 Rxe3>

<30 Rxe3 Rd3>
<31 Re1 Nd6>
<32 Nc5!>

Now since the white knight is forking the pinning bishop and the rook, black has to defecate or get off the pot, as it were.

If now 32...Nxe4 33. Nxd3 Nf2++ 34. Kg1 Nxd3 wins the exchange.

If 32...Nxe4 33. Rxe4 Rd1+ wins the exchange, too.

If, however, 32...Nxe4 33. Nxb7 Nf2+ 34. Kg1/2 Nxg4 wins a whole miserable pawn, as in your variation.

Jun-02-17
Premium Chessgames Member
  agb2002: Black has a bishop for a knight.

White is about to play Kg1.

The bishop x-rays the white king. This suggests Nd6, Rd3 and Rd1.

In the case of 28... Nd6 29.Nxd6 R5xd6+ (29... Rd3+ 30.Nxb7 + -) 30.Kg1 and Black seems to have lost some advantage.

After 28... Rd1 29.Rfe1 Black doesn't seem to have achieved much.

In the case of 28... Rd3:

A) 29.Re2 Nd6 30.Nbc5 Bxe4+ (30... Nxe4 31.Nxb7 -31.Nxd3 Nf2+ 32.Kg1 Nh3#-, unclear) 31.Nxe4 Nxe4 32.Rxe4 Rd2

A.1) 33.Rb1 Rc2 followed by Rdd2 looks very good for Black.

A.2) 33.b4 Rc2 34.Re3 (34.Rf3 Rd1+ and mate in two) 34... Rdd2 35.Rh3 Re2 followed by e4-e3 looks winning.

A.3) 33.Rb4 Rc2 as above.

B) 29.Rxd3 Bxe4+ 30.Rdf3 (else Rxd3 wins a piece) 30... Rd1 31.Kg1 (31.Kg2 Rxf1 32.Kxf1 Bxf3 wins a piece) 31... Bxf3 32.Rxd1 Bxd1 wins a piece.

Jun-02-17  RandomVisitor: After 27.Qe3 maybe black had a faster way to win:


click for larger view

Stockfish_17052608_x64_modern: <5 1/2 hours computer time>

<-6.02/48 27...Rd1 28.Kg2 Rxf1 29.Qxa7 Nxa7 30.Rxf1 Bxe4+> 31.Kf2 Bc2 32.Nc5 Nc6 33.b4 Rd2+ 34.Kg3 e4 35.h3 Ne5 36.Kf4 Kf7 37.Nxe4 Rd3 38.Ng5+ Kg8 39.Nf3 Nc6 40.Nd4 Nxd4 41.cxd4 Rxd4+ 42.Kf3 Rxb4 43.Re1 Ra4 44.Re8+ Kf7 45.Rc8 Be4+ 46.Ke3 Bg2 47.Rc7+ Ke8 48.Rc8+ Kd7 49.Rg8 Bxh3 50.Rxg7+ Ke8 51.g5 Bxf5 52.gxf6 Rxa5 53.Kd4 h5 54.Rb7 h4 55.Ke5 b4+ 56.Kf4 Kf8 57.Rxb4 Kf7 58.Ke3 Ra3+ 59.Kf2

-2.82/48 27...Qxe3 28.Rxe3 Rd3 29.<Re2> Nd6 30.Nbc5 Bxe4+ 31.Nxe4 Nxe4 32.Rxe4 Rd2 33.Rb1 Rc2 34.Re3 Rdd2 35.h3 Rh2+ 36.Kg1 Rcg2+ 37.Kf1 Rf2+ 38.Kg1 Rhg2+ 39.Kh1 Rxb2 40.Rxb2 Rxb2 41.Rd3 Ra2 42.Rd8+ Kf7 43.Rd7+ Kf8 44.Ra7 Rxa5 45.Kg2 Ra3 46.h4 h6 47.Kf2 Kg8 48.Kg2 Ra4 49.Kh3 a5 50.Rb7 Ra1 51.g5 fxg5 52.hxg5 hxg5 53.Rxb5 e4 54.Re5 a4 55.Rxe4 a3 56.Ra4 Kf7 57.Ra6 a2 58.Kg2 Ke7 59.Kf2 Rh1 60.Ra7+ Kf8

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