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Rashid Ziatdinov vs Dimitri Gurevich
Bern 63/160 (Gurevich,D; Fishbein,A) (1995), Bern 63/160 Gurevich,D; Fishbein,A
Sicilian Defense: Richter-Rauzer. Classical Variation (B64)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Sep-14-08  TrueBlue: ok, real solution a bit disappointing, I was hoping for a crazy win after Nc3 that I didn't see. Instead, we get something close to what I played :(
Sep-14-08
Premium Chessgames Member
  johnlspouge: Sunday (Insane): Ziatdinov vs D Gurevich, 1995 (23…?)

Black to play and win.

Material: 2N for 2B. The White Kb1 has 2 legal moves and is susceptible to back-rank mates. Black has Rc8 on a semi-open file, blocked by Bc7 and Pc2. The Black Qg5 is in the open, able to menace the entire board. The Black Ne3 and Ne4 have advanced centrally into the enemy position and can threaten both sides of the board. The White Re1 threatens both Ns, and the advanced Ne3 requires protection from Qg5, while Bf3 threatens the loose Ne4. Only the Black Rf8 requires activation. No candidate springs to the eye. A mate with the White K at a1 and the Ns at c2 and d2 (or c3) seems relevant, indicating that control of the c- or d-file has added importance.

Candidates (23…): Nd2+, Nc3+, Rxc7, Nxc2, Rfd1, Qc5, Qb5, Nc5

I believe 23…Nc5 wins a P. Although 23…Rfd1 looks the best positional attacking move, but I could not justify it.

The winning sequence is attractive, but the kibitzing indicates a weak defense.

Sep-14-08
Premium Chessgames Member
  chrisowen: Possibility for knight stacs with rapid cycling. Looks like 23..Nxc2 Bxe4 Nxe1 Rxe1 Rce8 g3 Re6 Bf4 Qa5 Bd2 whereby it levels out, but black changes gear via 23. Rxc7. For Rd1, white's racing thoughts are slipstreamed as mate is forced.
Sep-14-08
Premium Chessgames Member
  johnlspouge: 23...Rfd1 leaves Black only slightly better than White, because it permits the defence 24.h4. Immediate capture with 23...Rxc7 forces White to recapture immediately.
Sep-14-08  ToTheDeath: I went with 23...Nc5, deflecting the Queen which is actually quite good, but 23...Rxc7 is just winning.
Sep-14-08  braimondi: First time I saw a insane puzzle... =D
Sep-14-08
Premium Chessgames Member
  zenpharaohs: 25 Kc1 is a mistake, 25 Ka1 is a lot better and leaves things more or less where they were at the start of the line. Because of this, the game line is OK, but not particularly a lot better than 23 Nf2 or 23 Nc5. This makes the game line hard to "see", since it's another case where the opponent's mistake creates the value of the move.

26 Rd1 is a blunder, with 26 Re2 or 26 a3 being better.

Sep-14-08
Premium Chessgames Member
  al wazir: <Dr. J: Sorry, 26 Rxe3 refutes this.> I'm sorry too. But thanks.

I didn't solve this because there was no solution.

Sep-14-08
Premium Chessgames Member
  DarthStapler: I didn't get it
Sep-14-08
Premium Chessgames Member
  zenpharaohs: Thean: "Btw, I'd still like to complain that when people say that it's 'only' one pawn gain in a seemingly drawn endgame, they're true, but it doesn't make a puzzle a spoiler."

It does when black was up the pawn already in the position before the puzzle.

Yes, Rxd7 is the best move, but I had to use Rybka for a while to really believe that. It is only slightly better than the next best alternative, which evaluates

Sep-14-08  Dr. J: PART 1 <Dr. J: <al wazir & JohnBoy: 25.Ka1 Qe5 26.Qc3 Qxc327. bxc3 Nxc2+ 28.Kb2 Nxe1 29.Rxe1 Nxf3 30 gxf3 . Black is up one . Not very conclusive.> I agree. White is about to take the 7th rank, which should give some real drawing chances. Crafty's -1.5 evaluation looks somewhat generous to Black. ... ...>

<TheaN ... ... 23....Rxc7 24.Qxc7 Nd2† 25.Ka1 Qe5 26.Qc3 Qxc3 27.bxc3 Nxc2† 28.Kb2 Nxe1 29.Rxe1 Nxf3 30.gxf3 f5! 31.Re7 Rf7. Black is better, and probably winning with this many weaknesses yet to exploit.>

Nice line. I missed 30 ... f5 31 Re7 Rf7, after which Black is certainly (not just "probably") winning. He advances the K-side majority, forcing the White K + R to defend, after which at leat one of White's Q-side pawns will be indefensible. Still a fair bit of work to do, but Crafty's evaluation of -1.5 looks good to me.

PART 2 <Dr. J: ... ... 26 Rd1?? is a huge blunder. 26 Re2 prevents the smothered mate, and seems to leave Black nothing better than 26 ... Nxf3+ 27 Kb1 Nd2+ 28 Ka1 ... ... >

<lost in space: ... ... 25 Kc1 Nec4 26. Re2 26...Nxf3+ 27. Kb1 Qb5 28. b3 Na3 29. Qb2 Qxe2 30. gxf3 Nb5 >

Right you are. 26 Re2 is still much better than 26 Rd1, but your line is a very clear win. (White can again improve with 27 c3 but then 27 ... Nfd2+ 28 Kc2 Qxb2+ 29 Kd3 Qxa2, but this is still clearly lost.)

Conclusion: White defended terribly, but the puzzle is sound.

Sep-14-08  Towershield: 26.Re2 might have been a bit better; but its still completly winning for black:

26...Nxf3+ 27.Kb1 Ncd2+ 28.Ka1 Nd4! and black has no decent response, for instance if 29.Ree1 then Qf5! with the of idea Rc8 wins on the spot.

Sep-14-08  stukkenjager: <WWP> Unfortunately these nice lines are busted early on 23...Nf2? 24. Bxb7! and black just drops a pawn which I didn't see.

what about: 23...Nf2 24.Bxb7 Qc5! 25.Bxc8 Qxc2+ 26.Ka1 Nd3 27.Qd4 Nxe1 28.Rxe1 Nxg2 29.Rg1 Rxc8 30.Bf4 Re8

Black is ok here

Sep-14-08
Premium Chessgames Member
  Underworld: Wow, pretty easy insane. I like it though. I always enjoy these kind of mates
Sep-14-08  Woody Wood Pusher: < stukkenjager: <WWP> Unfortunately these nice lines are busted early on 23...Nf2? 24. Bxb7! and black just drops a pawn which I didn't see.

what about: 23...Nf2 24.Bxb7 Qc5! 25.Bxc8 Qxc2+ 26.Ka1 Nd3 27.Qd4 Nxe1 28.Rxe1 Nxg2 29.Rg1 Rxc8 30.Bf4 Re8

Black is ok here >

nice line, can somebody analyse 23...Nf2 and give a computer analysis please?

Sep-14-08
Premium Chessgames Member
  al wazir: With best play black gets a ♙. Yes, black can win the resulting endgame -- but it isn't won yet.

Note that black could have won a ♙ more simply with 21...Qxg2. If 22. Qxf5, then 22...Qxe2 23. Rhe1 Qc4.

Sep-14-08  jovack: what i saw was rook takes c7 removes the queen from defense of the d file which could allow for a knight/queen attack... i recognized a potential smothered mate, after i saw white play Rd1, i knew right away that i was right..

so i guess i mostly solved this one

Sep-14-08
Premium Chessgames Member
  Amulet: A smothered mate.
Sep-14-08  waustad: With my plentiful lack of strength, I'm amazed that I got the basic idea of the Saturday and Sunday puzzles immediately. Usually I haven't a clue after Thursday.
Sep-14-08
Premium Chessgames Member
  Gilmoy: The baleful influence of a Ng3/Nb3 vs. a castled K is a rare pattern indeed. The N can deprive all flight squares right through the intact pawn wall (flashback to those insanely annoying <lobbers> in the Gauntlet video game), so any next check is matish -- most picturesquely delivered by the other N!

You must buy a tempo so that he doesn't just eat your N. Gurevich does it with a double-check. Morphy famously discover-attacked Marache's loose Q in N Marache vs Morphy, 1857.

As others have noted, Q+N is a common trigger for smothered mates. Sometimes it's not quite there, and our idea-wells run dry. But Q+2N is also a very-rare trigger for the Nb3/Ng3 other-smother pattern. Add that to your palette as a new tint of blue.

Sep-15-08  Woody Wood Pusher: << stukkenjager: <WWP> Unfortunately these nice lines are busted early on 23...Nf2? 24. Bxb7! and black just drops a pawn which I didn't see.

what about: 23...Nf2 24.Bxb7 Qc5! 25.Bxc8 Qxc2+ 26.Ka1 Nd3 27.Qd4 Nxe1 28.Rxe1 Nxg2 29.Rg1 Rxc8 30.Bf4 Re8

Black is ok here >

nice line, can somebody analyse 23...Nf2 and give a computer analysis please?>

I have looked at this line even more and I cannot find an improvement for white. This line leaves black a pawn up, just like the 23..Rxc7 line (with best play) so it seems to be a viable alternative.

If somebody could analyse this line with a computer I would really appreciate it!

Sep-15-08
Premium Chessgames Member
  Once: <Woody Wood Pusher>

As promised, this is what Fritz 11 makes of your line. The first few moves are identical to <stukkenjager>'s line, so I guess that he is either a very strong player or also using Fritz!

23... Nf2 24. Bxb7 Qc5 25. Bxc8 Qxc2+ 26. Ka1 Nd3 27. Qd4 Nxe1 28. Rxe1 Nxg2 29. Rg1 Rxc8 30. Bf4 Rc4 31. Qd8+ Kh7 32. Bd2 Nf4


click for larger view

Fritz assesses this as -1.13, so a very similar outcome to the game continuation (with best defence from white). I have not looked at this exhaustively (ie no back sliding), but it looks as if 23. ... Nf2 is an equally valid solution. Well spotted!

Sep-16-08
Premium Chessgames Member
  jessicafischerqueen: <Woodman>

I see that <Uncle Fritz> has verified your line already!!!

Looks like I'm too late-- again...

Sep-16-08  Woody Wood Pusher: <once> thanks for looking at that for me, I thought the Nf2 line was at least playable and this proves it. Cheers.

<JFQ> Its the thought that counts so thank you as well!

Sep-16-08
Premium Chessgames Member
  patzer2: For the Sunday September 14, 2008 puzzle solution, Black plays the deflection sham sacrifice 23...Rxc7!! In so doing, he clears the way to weaken and decisively exploit the White Queen-side castled position.

White could have put up more resistance with 25. Ka1, but after 25. Ka1 Qa5 26. Qc3 Qxc3 27. bxc3 Nxc2+ 28. Kb2 Nxe1 29. Rxe1 Nxf3 30. gxf3 f5 Black with five strong pawns should be able to decisively exploit White's four isolated pawns in the endgame.

If 26. Re2, then Black wins easily after 26...Nxf3+ 27. Kb1 (27. Kd1 Nxb2#) 27... Qb5 28. b3 Na3+ 29. Kb2 Qxe2 30. gxf3 Nb5 .

In the final position, Black has a smothered mate after 26... Nb3+ 27. Kb1 Qc1+ 28. Rxc1 Ncd2#.

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