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Alexey Korotylev vs Vladimir Akopian
Aeroflot Open (2006), Moscow RUS, rd 4, Feb-11
Benoni Defense: Classical Variation. General (A70)  ·  0-1



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find similar games 1 more A Korotylev/V Akopian game
sac: 27...Rxe4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
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Aug-23-13  mrsaturdaypants: Impressive. Pretty.
Aug-28-15  SpiritedReposte: Playing through this game I wasn't even impressed but <32. ...Nf3+!> hit and I thought wow that is pretty.
Aug-22-20  Cheapo by the Dozen: I went with 32 ... Nxg4, which the engine thinks yields a minor advantge, rather than the game move, which the engine thinks loses.
Aug-22-20  TeaChess: 36. Qxe3 Bd4 37. Re1 Bxe3 38. Rxe3 even game?
Aug-22-20  areknames: My first instinct was 32...h3 which looks pretty strong. In the surprising game continuation how does Black win after <35.Kf2> ? Seems to me that White's king crawls away to safety, and he has a rook to spare.
Premium Chessgames Member
  Check It Out: I was pretty impressed with the recent xomments.
Aug-22-20  Walter Glattke: Black has a knight for rook and pawn. I play the line 32.-Qxg4 33.Rf1 h3 34.Rxf8+ Rxf8 35.Rf1 Rxf1+ 36.Kxf1 hxg2+ 37.Qxg2 Qe1# Or 37.Kg1 Nf3+ 38.Kf1 g1Q+ or 33.Re2 Nf3+ 34.Kh1 Nxd2 35.Rxd2 Be5
Aug-22-20  Walter Glattke: Oh, wrong, one black rook too much. 32.-Qg4 33.Rf1 Nf3+ 34.gxf3 Rxf3 35.Re1 h3 36.Kh1!? hxg2+ 37.Qg2 Qh4+ - white has no good move 36
Aug-22-20  Brenin: 35 Kf2 looks like a refutation: as <areknames> said, the White K can creep away via e1, and the R on b1 can join the defence. A better line for Black seems to be 32 ... h3 (33 gxh3?? Nf3+ wins the Q), e.g. 33 Rf1 Rxf1+ 34 Rxf1 (34 Kxf1 h2) Nc4 and 35 ... Nxe3, or 33 Kh1 hxg2+ 34 Qxg2 Qh7+ 35 Qh2 Qxe4+
Aug-22-20  agb2002: Black has a knight for a rook and a pawn.

Black has Nc4 (recovers the exchange), Qxe4, Qxg4 and h3. The last one looks strongest:

A) 33.gxh3 Nf3+ wins.

B) 33.Rf1 Rxf1+

B.1) 34.Rxf1 Nc4 followed by Nxe3 wins material while keeping the attack.

B.2) 34.Kxf1 h2

B.3.a) 35.Kf2 Qxe4 followed by Nxg4 looks overwhelming. For example, 36.Rf1 Nxg4+ 37.Ke2 Nxe3 38.Qxe3 Qxe3+ 39.Kxe3 Bd4+ and after 40... Bg1 the h-pawn promotes.

B.3.b) 35.Ke2 Qxg4+ 36.Kf2 Qxe4 looks similar to B.3.a.

C) 33.Qe2 hxg2

C.1) 34.Qxg2 Nf3+ 34.Kf1(2) (34.Kh1 Qh7 and mate in two) 34... Qxe4, with the double threat Nxe1+ and Nh4+ looks very good for Black.

C.2) 34.Kxg2 Qxe4+ followed by Rf3 or Nf3 and Qxg4 seems to win.

Aug-22-20  SugarDom: We got a problem with the difficulty rating. Here 3 and half star is easy to see. While on the other puzzles, I can be stumped by one star for five minutes.
Aug-22-20  mel gibson: I saw the best move which is 32... h4-h3.
The text move is close to a draw according to Stockfish 11.

Stockfish 11 says:

32... h4-h3

(32. .. h3 (h4-h3 ♖e1-f1 ♖f8xf1+ ♖b1xf1 ♘e5-c4 ♕d2-e1 ♘c4xe3 ♖f1-f3 ♗g7-d4 ♔g1-h2 ♕g6xe4 ♕e1-h4 ♘e3xg4+ ♔h2xh3 ♘g4-f2+ ♕h4xf2 ♗d4xf2 ♖f3xf2 ♕e4xd5 g2-g3 ♕d5-e6+ ♔h3-h4 ♕e6-h6+ ♔h4-g4 ♕h6-e3 ♖f2-f5 ♕e3-e4+ ♔g4-g5 ♔g8-g7 b2-b3 ♕e4-e3+ ♔g5-g4 ♕e3xb3 ♖f5-g5+ ♔g7-f7 ♖g5-f5+ ♔f7-e6 ♖f5-f2 ♕b3-c3 ♔g4-h3 ♕c3xa5 ♔h3-g4 b7-b5 ♔g4-h3 ♔e6-e7 ♖f2-f5 b5-b4) +9.70/38 136)

score for Black +9.70 depth 38

Premium Chessgames Member
  beenthere240: Whites g4 pawn looked like an obvious target but it never fell.
Aug-22-20  Pedro Fernandez: My ten minutes analysis:

32...Nf3+ 33. gxf3 Rxf3 34. Qe2 Qxe4 35. Rf1 Qxg4+ 36. Kh1 Rh3+ 0-1

Premium Chessgames Member
  Jimfromprovidence: <brenin> <35 Kf2 looks like a refutation: as <areknames> said, the White K can creep away via e1, and the R on b1 can join the defence.>

A useful exercise here is to determine why 35 Kf2 works but not 35 Kf1, below.

click for larger view

Aug-22-20  seneca16: 35 Kf2 Qg4 now what?
36 Ke1 Rg1+ mates
36 Kf1 Qh3+ 37. Rg2 Rxe3 followed by Bd4 or
Rf3+ looks decisive.
Aug-22-20  Brenin: <seneca16>: After 35 Kf2 Qxg4 try 36 Rf1, followed by 37 Ke1, instead. Black's attack is petering out, the h pawn is going nowhere, and Black is down R for P. I think this also solves <JimfromProvidence>'s exercise: if 35 Kf1 then Black can play Qxe4, forking the R on b1 and a deadly check on h1, whereas if 35 Kf2 Qxe4 then 36 Rf1 deals with both threats.
Aug-22-20  areknames: <this also solves <JimfromProvidence>'s exercise: if 35 Kf1 then Black can play Qxe4, forking the R on b1 and a deadly check on h1> Yes, I think it does solve that very instructive exercise!

<whereas if 35 Kf2 Qxe4 then 36 Rf1 deals with both threats.> Also correct, but I think 36.Rg1 works equally well. Either way the extra R comes to the rescue.

Aug-22-20  RandomVisitor: After 34...Rg3+ the white king can attempt to reach safety on the Queenside:

click for larger view

NNUE evaluation using 20200812-2257.bin enabled.

<57/49 1:20:30 0.00 35.Kf2 Qf7+ 36.Ke1 h3 37.Qd3 Bh6 38.Kd2> Rxe3 39.Rxe3 Qf2+ 40.Kc3 Bxe3 41.Kb3 h2 42.e5 c4+ 43.Qxc4 Qf3 44.exd6 h1Q 45.Rxh1 Bg5+ 46.Kb4 Bd2+ 47.Ka4 Qxh1 48.Qc8+ Kg7 49.Qd7+ Kg6 50.Qf5+ Kg7 51.d7 Qd1+ 52.Ka3 Qa1+ 53.Kb3 Qd1+ 54.Ka2 Qa4+ 55.Kb1 Qd1+

Aug-22-20  RandomVisitor: After 32...h3 black has too many threats

click for larger view

NNUE evaluation using C:\Users\TheDesk\Downloads\20200812-2257.bin enabled.

<44/71 1:02:32 -14.74 33.Rf1 Rxf1+ 34.Rxf1 Nc4 35.Qf2 Nxe3> 36.gxh3 Nxf1 37.Kxf1 Qxe4 38.b3 Qb1+ 39.Kg2 Qxb3 40.Qf5 Qb2+ 41.Kh1 Qc1+ 42.Kg2 Qd2+ 43.Kf3 Qd1+ 44.Kg3 Qe1+ 45.Kg2 Qe2+ 46.Kg3 Qe5+ 47.Qf4 Qxf4+ 48.Kxf4 Be5+ 49.Kf5 c4 50.Ke4 Kf7 51.h4 Kf6 52.Kf3 Bd4

Aug-22-20  TheBish: Korotylev vs Akopian, 2006

Black to play (32...?) "Very Difficult"

Black is down the Exchange (knight for rook) and a pawn, but the white g4 pawn is loose so pawn count is irrelevant. The obvious 32...Qxg4 sets up a deadly knight fork, but seems easy to meet by 33. Kh1. Is there a sacrifice instead? The knight fork would loosen things up a bit around the White "chief". But then Black will be down a rook, so he better be winning the king or queen in return!

32...Nf3+! 33. gxf3 Rxf3

So far, so forced. Now the threat is 34...Qxg4+ followed by winning the queen via rook pin (35. Qg2 Rg3 or 35. Kh1 Rh3+ 36. Qh2, a self-pin).

Wow! I'm cutting this short because after starting a full analysis workup (similar to how <agb2002> does, and how I used to do on a more regular basis), I realized there are too many lines to do justice to this in the short time left (about 45 minutes left before the next puzzle rolls around) and probably not worth the effort, as I am not publishing a book!

I started looking at the inferior defenses (34. Kh1, Kh2) before getting to 34. Re2 and 34. Bf2, but then I noticed another defense, 34. g5! (Exclam not denoting a good move, but the conventional usage.) I realized then and there it was too much, as there are so many variations and sub-variations. The gist is that after weaker defenses (34. Kh1 or Kh2), Black will win the queen (after 34...Qxg4) with an eventual rook pin or check forcing a queen interposition. So I will just highlight a couple of possible defenses other than the game continuation (with engine assistance, which I never resort to before posting here normally).

(A) 34. Bf2 Qxg4+ 35. Kf1 (else 35...Rh3#) 35...h3 (35...Bd4 also works) 36. Re3 Qg2+ 37. Ke1 h2 and wins.

(B) 34. g5 Qxe4 and White has no defense. 35. Re2 is impossible because of 35...Qxb1+, 35. Qg2 Rg3 wins the queen, and if 35. Kh2 Be5+ 36. Kg1 Qg4+ 37. Qg2 Rg3 wins the queen and the end is near.

Aug-23-20  TheBish: Looks like the game line 32...Nf3+(!?) was only good enough to draw, and White missed the improvement 35. Kf2!, which even wins for White if Black doesn't play perfectly. So 32...h3! is the winning move (which others have pointed out).
Aug-23-20  TheBish: The engine gives the line 32...h3 33. Bf4 (didn't see that move in any notes here) 33...Nxg4 34. g3 Bd4+ 35. Kh1 Nf2+ 36. Kh2 Nxe4 37. Rxe4 (37. Qe2 Rxf4 38. gxf4 Qg3+ 39. Kh1 Nf2+ wins the queen; 37. Qc1 Bf2) 37...Qxe4 38. Re1 Qxd5 with ⩱ (small Black advantage).
Aug-23-20  areknames: <The engine gives the line 32...h3 33. Bf4 (didn't see that move in any notes here)> Here Black simply plays 33...Nc4 followed by Bd4+ and wins, rather than 33...Nxg4.
Aug-23-20  Pedro Fernandez: The move 32...h3 suggested by my friend Dr. <RandomVisitor> is some hard to see, and perhaps the best one, but I think 32...Nf3+ is more natural and also it is a winner move.
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