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Vladislav Tkachiev vs Andrei Kharlov
Russian Club Cup (2006), Sochi RUS, rd 10, Apr-29
Queen's Gambit Declined: Ragozin Defense. Vienna Variation (D39)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
May-12-22  Brenin: My first thought was 20 Rxe6+ fxe6 21 Qg6, but this loses to 21 ... Qe5, defending e6 and threatening Qe1 mate. Therefore Plan B has to be 20 Bxe6, picking up another P and threatening a nasty discovered check, e.g. 20 ... fxe6 21 Qg6 Bd7 22 Rxd7+ Kxd7 23 Qf7+ with what looks like a mating attack. Instead 21 ... Bd5 offers more resistance, but it allows 22 Qxg5+, giving White 3P plus an attack for the sacrificed B; promising, but I'm not convinced.
May-12-22  mel gibson: I didn't see that.

Stockfish 15 follows only the first ply:

20. Bxe6

(20. Bxe6 (♗c4xe6 f7xe6 ♕b1-g6 ♗c6-d5 ♕g6xg5+ ♔e7-d7 ♕g5-e5 ♖a8-e8 c3-c4 ♕a5-c7 ♕e5-f6 ♔d7-c8 c4xd5 ♖g8xg7 d5xe6 b7-b6 g2-g3 ♖g7-e7 ♕f6-g5 ♖e8-d8 ♖d4xd8+ ♕c7xd8 ♕g5-e5 ♕d8-d3 h2-h4 a7-a6 h4-h5 ♕d3-d2 ♖e1-e2 ♕d2-c1+ ♔g1-g2 ♕c1-c6+ f2-f3 ♕c6-c1 ♕e5-e4 ♔c8-b8 f3-f4 ♔b8-a7 g3-g4 ♖e7-g7 f4-f5 ♕c1-g5 ♔g2-g3 ♖g7-c7 ♕e4-e3 ♕g5xe3+ ♖e2xe3 a6-a5) +10.44/37 176)

score for White +10.44 depth 37.

Also -
following the game line:
20 ...Kf6

20. Bxe6 Kf6
21. Rd6
(21. Rd6 (♖d4-d6 ♕a5-e5 ♗e6xf7+ ♔f6-e7 ♖d6xc6 b7xc6 ♖e1xe5+ ♔e7-d6 ♕b1-b4+ ♔d6-c7 ♖e5-e7+ ♔c7-c8 ♗f7-e6+ ♔c8-d8 ♕b4-d6+) +M8/76 22)

White wins _ mate in 8.

May-12-22
Premium Chessgames Member
  Breunor: Was having a good week, but this was too tough for me.
May-12-22
Premium Chessgames Member
  raymondhow: I got the first move, then wanted to play 21.Rd5 to either cut off the black Q or force trade for R + B. Engine says that's also decisive, so I claim credit.
May-12-22  takebackok: Easier than yesterday process of elimination gets Bxe6
May-12-22
Premium Chessgames Member
  scormus: I found the W moves OK, from the text sequence of positions, but didnt choose all the B. Still puzzled as to 20 ... Kf6 and not fxe6, since 21 Bxf7 obviously leaves the BK defenceless
May-12-22  nalinw: Perhaps needing to spot Bxf7 and then Qb3+ (which I didnt see at all) is what makes it a Friday puzzle
May-12-22  WickedPawn: 21. Rd5 was my second move. <raymondhow> confirmes it was decisive also. <chrisowen>: where are you?
May-12-22  Besrqe: The Bishop sac is so strong I saw another way to win after the game line of 20...Kf6. I chose 21.Qh7 with the same idea of infiltrating with the Queen in the line where Black takes the Bishop 20...fxe6, 21.Qg6.

So, 21.Qh7 Rxg7, 22.Qh3! saves the Bishop. SF gives 22...Rg6 to run the BK to g7 and White retreats the Bishop back to c4 or b3 and the White Rooks are clear to invade down the center files to squares like e7 and d6. If 22...Re8, 23.Rd6.

May-12-22  goodevans: I had a sudden rush of blood to the head and decided to sac my Q with <20.Qg6?!>. After <20...fxg6> (what else is there?) <21.Rxe6+ Kf7 22.Re5+ Bd5 23.Rdxd5> it looks like White has an overwhelming attack.


click for larger view

But Black just returns the sac'd material with <23...Qxd5 24.Bxd5+ Kf6! 25.Bxg8 Rxg8> and after White's g-pawn falls White is just a pawn up in a R+P endgame which Black can probably draw.

Close but no cigar!

May-12-22
Premium Chessgames Member
  chrisowen: I lush e6 any wovern ok afford position winning i'de have a hunch it is a Bxe6 clung on :)
May-12-22  Stanco: 30.Bxe6 having in mind 31.Qg6 if takes
May-12-22
Premium Chessgames Member
  chrisowen: Feed me seymour ice
May-12-22
Premium Chessgames Member
  agb2002: White is one pawn up.

Black threatens Rxg7 and Qxc3.

The convergence of one rook and the bishop on e6 suggests 20.Bxe6:

A) 20... fxe6 21.Qg6

A.1) 21... Bd7 22.Rxd7+ Kxd7 23.Qxe6+ Kc7 (23... Kd8 24.Qxg8+ and 25.Qxa8 wins decisive material) 24.Qf7+ Kb(c)6 (24... Kd6 25.Re6+ Kc(d)5 26.Qf5+ Kc4 27.Qxa5 wins decisive material) 25.Re6+ Kb5 26.Qf5+ Ka4 27.Re4+ and mate soon.

A.2) 21... Bd5 22.Qxg5+ Kf7 (22... Ke8 23.Rxe6+ Bxe6 24.Qxa5 wins decisive material) 23.Rf4+ Ke8 24.Rxe6+ Bxe6 (24... Kd7 25.Qe7+ Kc8 26.Rf8+ and mate in two) 25.Qxa5 wins decisive material.

B) 20... Rxg7 21.Bc8+ Kf8 (21... Kf6 22.Rd6#) 22.Qb4+ wins the queen (22... Qxb4 23.Rd8+ and mate next).

C) 20... Kf6 21.Bb3 (21.Rd5 is interesting) keeps the attack and extra pawn.

May-12-22
Premium Chessgames Member
  Jimfromprovidence: Here is a beautiful side result I found after trying various defenses after 20 Bxe6.

The line is 20 Bxe6 Rxg7?! 21Bc8+! (Blocking the rook) 31...Kf8 22 Qb4+!


click for larger view

Black must lose his queen or get mated.

May-12-22
Premium Chessgames Member
  Jimfromprovidence: <agb2002> beat me to the punch with his B line.
May-12-22  AlicesKnight: I settled on the line described by <Brenin> above. Didn't see the Q-sac idea - nice.
May-13-22
Premium Chessgames Member
  whiteshark: <20.Bxe6> works for me.
May-13-22  TheaN: <Brenin: Instead 21 ... Bd5 offers more resistance, but it allows 22 Qxg5+, giving White 3P plus an attack for the sacrificed B; promising, but I'm not convinced.>

Didn't do this puzzle but I'd like to add to this. 20.Bxe6 fxe6 21.Qg6 Bd5 22.Qxg5+:


click for larger view

<is> convincing, because it actually wins the bishop back by force.

22....Ke8 23.Rxd5 +- or 22....Kf7 23.Rf4+ +- are absolute suicide. 22....Kd7 might technically be best, but the king's actually more dangerously placed after 23.Qe5 +-, as 23.....Rae8 24.c4 +- doesn't help.

After the small king chase 22....Kd6 23.Qe5+ Kc5 (attacking Rd4, other moves lead to worse) 24.Red1! +- (24.c4?! Qxe1+ 25.Qxe1 +- is winning but a bit more risky):


click for larger view

And c4 is coming.

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