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Alexander Lastin vs Konstantin Chernyshov
European Championship (2001), Ohrid MKD, rd 2, Jun-02
Sicilian Defense: Dragon Variation. Yugoslav Attack Main Line (B77)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jan-02-21  stacase: I got the first two obvious moves of an eleven move series. Puzzle should have probably started at 30...Kf8 White to move.
Jan-02-21
Premium Chessgames Member
  al wazir: After the obvious 29. Rxg7 Kxg7 30. Rc7+ Kf8, I would have played 31. Nf6. It *almost* works.

If 31...Qf4, then 32. Nxh7+ Kg8 33. Qxg6+ Kh8 34. Qg7#.

If 31...Qg3 , then 32. Nxh7+ Kg8 33. Qd5+ Kh8 34. Qf7 Rg8 35. Qf6+ Rg7 36. Qxg7#.

If 31...Qh6, then 32. Nxh7+ Kg8 33. d5+ Kh8 34. Qxe5+ Kg8 35. Qe6+ Kh8 36. Qf6+ Kg8 37. Qf7+ Kh8 38. Nf6, with 39. Qh7+ and 40. Rxh7# to follow.

But I don't see any way to win after 31...Rd6.

Jan-02-21  RandomVisitor: The computer thinks the main line is through 30..Kh8, including the cleverly taunting move 33.Qg2:


click for larger view

Stockfish_20123118_x64_modern:

45/73 15:08 +8.50 29.Rxg7 Kxg7 30.Rc7+ Kh8 31.f4 Re8 32.Nf6 Re6 33.Qg2 Qh6 34.Rxh7+ Qxh7 35.Nxh7 exf4 36.Ng5 Re7 37.Qd5 Rf8 38.Qd6 Ref7 39.Qxg6 Re7

45/73 15:08 +8.50 29.f4 Re8 30.Rxg7 Kxg7 31.Rc7+ Kh8 32.Nf6 Re6 33.Qg2 Qh6 34.Rxh7+ Qxh7 35.Nxh7 exf4 36.Ng5 Re7 37.Qd5 Rf8 38.Qd6 Ref7 39.Qxg6 Re7

45/79 15:08 +8.04 29.R1c2 Qh6 30.Rxg7 Qxg7 31.Rc7 Rg8 32.Rxg7 Rxg7 33.Qxe5 Rf8 34.Nf4 Rf5 35.Qb8+ Rg8 36.Qd6 Ra8 37.Qc7 Re8 38.Qd7 Ree5 39.Qxb7 Rf8

Jan-02-21  morfishine: Slippery eel
Jan-02-21  Refused: < al wazir: After the obvious 29. Rxg7 Kxg7 30. Rc7+ Kf8, I would have played 31. Nf6. It *almost* works. If 31...Qf4, then 32. Nxh7+ Kg8 33. Qxg6+ Kh8 34. Qg7#.

If 31...Qg3 , then 32. Nxh7+ Kg8 33. Qd5+ Kh8 34. Qf7 Rg8 35. Qf6+ Rg7 36. Qxg7#.

If 31...Qh6, then 32. Nxh7+ Kg8 33. d5+ Kh8 34. Qxe5+ Kg8 35. Qe6+ Kh8 36. Qf6+ Kg8 37. Qf7+ Kh8 38. Nf6, with 39. Qh7+ and 40. Rxh7# to follow.

But I don't see any way to win after 31...Rd6.>

After 31...Rd6 I went with 32.Nd7+ Rxd7 33.Rxd7 Qf4 (what else?) 34.Qd5 White must still be better/very close to winning thanks to weak black king/the Rook on the seventh.

Game continuation is of course superior.

Jan-02-21
Premium Chessgames Member
  An Englishman: Good Evening: Not giving myself credit for this one due to choosing the second-rate move 31.Nf6. Still, did solve Saturday, and 5/6 for the week with one known rates as better than usual for me.
Jan-02-21  Walter Glattke: White can play 29.Rxg7 Kxg7 30.Rc7+ Kh8 31.Nf6 Rd2!? 32.Rxh7+ Qxh7 33.Nxh7 Kxh7 34.Qxe5 Rbd8 35.Qxa5 with white advantage, hard to win
Jan-02-21  Brenin: The first two moves were obvious, but the follow-up wasn't. I would have played 29 R1c2 and/or f4 first, before Rxg7.
Jan-02-21  goodevans: Not a fan of puzzles with more than one right answer. I went with <29.f4>.

Black's B isn't going anywhere so no rush to take it and if black tries to defend it with 29...Rg8 then 30.Rh1 wins the Q (30...Qg3? 31.Rxh7+!).

As several have already hinted at, the game continuation gets quite hard to find after the first couple of moves. After 29.f4 it's so much simpler.

Jan-02-21
Premium Chessgames Member
  scormus: I wondered about 29 f4, but gut feeling made me go with 29 Rxg7 then Rc7+, expecting .... Kh8. Lost my way after .... Kf8, I went for 31 Nf6, but .
Jan-02-21  malt: Went with 29.R:g7 K:g7 30.Rc7+ Kf8

(30...Kh8 31.Nf6 Rd2 32.Q:e5 )

31.Qc4 Rd6 32.Ne7 Kg7 33.Nf5+ Kh8
(33...Kf6 34.N:d6 )

34.Qf7 Rg8 35.Rc8 Rdd8 36.Qf6+ Rg7 37.R:d8# (37.Q:g7#)

Jan-02-21
Premium Chessgames Member
  pawn to QB4: I went 29.Rg7 Kxg7 30. Rc7+ and if Kf8 then 31.f4. Glad to see Stockfish is OK with that, but I was hoping 31. Qc4 also works. I like the non-checking move, and there are multiple threats, e.g. 31...Re8 32. Nf6 Re7 33. Qg8 #, or 31...Rd6 32. Nb6 Rf6 33. Nd7+ and Nxb8. Is there a better defence for Black after 31. Qc4?
Jan-02-21
Premium Chessgames Member
  agb2002: White has a knight for a bishop and a pawn.

Black has Rxd5 if necessary.

White has Rxg7 and f4 to weaken e5, Black's strong point.

In the case of 29.f4:

A) 29... exf4 30.Rxg7

A.1) 30... Kxg7 31.Rc7+ Kh6 (else mate in two) 32.Nf6, with the double threat Rxh7+ and Ng4+, is winning.

A.2) 30... Rxd5 31.Qxd5 Kxg7 (due to Qe5 or Qd4) 32.Qe5+ and 33.Qxb8 wins decisive material.

B) 29... Rxd5 30.Qxd5

B.1) 30... exf4 31.Rxg7 transposes to A.2.

B.2) 30... Qxf4 31.Rc8+ Rxc8 32.Rxc8+ Bf8 33.Qxa5 followed by a simultaneous attack against Black's whole position, in particular the b-pawn.

-----

I'd play 29.f4 since it looks easier than a direct Rxg7.

Jan-02-21
Premium Chessgames Member
  chrisowen: Moskva river rxg7 gotcha abler leeway against assuage affables goodness guv moskva river borough hup flippers quady guv i quaint tidwinks lonely moskva river lozenge cvs joy its jumble foody bag ivory ritzs winch pf4 findy guv jovial abracadabra mob qh2 gab ablush leash ahhub rub rf8 gotcha abridge log river it diphour wet rxg7 efface!
Jan-02-21
Premium Chessgames Member
  chrisowen: Fishing water gate f4 better no?
Jan-02-21  RandomVisitor: On 30...Kf8 there is 31.Qc4 followed by Qc5. Note that on 31.Qg4 Rd6 as played, the machine would p[refer 32.Nf6:


click for larger view

Stockfish_20123118_x64_modern:

<57/60 10:24:50 +M22 31.Qc4 Rbc8 32.Qc5+> Kg8 33.Ne7+ Kg7 34.Nf5+ Kg8 35.Qc4+ Kh8 36.Rxc8 Qd2 37.Qh4 gxf5 38.Rxd8+ Qxd8 39.Qxd8+ Kg7 40.Qxa5 h5 41.Qxe5+ Kg6

57/90 10:24:50 +77.58 31.f4 Rdc8 32.Qxe5 Rxc7 33.Nxc7 Kf7 34.Qd5+ Kf6 35.Qd6+ Kf7 36.Qd7+ Kg8 37.Qd5+ Kf8 38.Ne6+ Ke7 39.Qe5 Qc2 40.Ng5+ Kd7 41.Qxb8 h5

<56/71 8:25:57 +49.70 31.Qg4 Rd6 32.Nf6> b6 33.Nxh7+ Kg8 34.Qc4+ Kh8 35.Qf7 Qh6 36.Nf6 Rxf6 37.Qxf6+ Kg8 38.Qe6+ Kh8 39.Qxe5+ Kg8 40.Rd7 Rf8 41.Qe6+ Kh8

Jan-02-21
Premium Chessgames Member
  tamar: Inflictin some Lastin pain
Jan-02-21
Premium Chessgames Member
  drollere: as others note, the B on g7 is a mating threat if e5 is advanced (Qxb2#), so Rxg7 Kxg7, Rc7+ seemed necessary to release the Q from its blocking role. i rejected Nf6 due to Rd2 which seemed very bad, but did not see a way forward either. it was very instructive to see how white manipulates black's position through the series of nine Q and R threats supported by a very nimble N.

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