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Jiri Jirka vs Vladislav Ivanovich Tkachiev
European Club Cup (2009), Ohrid MKD, rd 1, Oct-04
Modern Defense: Fianchetto. Azmaiparashvili Variation (A42)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Feb-11-10  Dr. J: <<johnlspouge:> Toga evaluates the dual solution 20...<Bxc3> as better than 20...<Rxe3> ...

[ply 15/38 value (to White) -2.54]

20...<Rxe3> 21.Rxe3 Qc2 22.Qxc2 Nxe3+ 23.Kh3 Nxc2 (etc.)

[ply 15/46 value (to White) -3.18]

20...<Bxc3> 21.Qxc3 Rxe3 22.Rxe3 Qc2+ 23.Qxc2 Nxe3+ 24.Kf2 Nxc2 25.Ne6 Rc8 26.Rd1 Kf7 27.Ng5+ Kg7 28.Ne6+ Kf6 29.Ng5 h6 30.Ne4+ Kf5 31.Nc3 N2d4 32.Nd5 a4 33.Ne3+ Ke4>

John (or anyone), what happens after <Bxc3 21.Qxc3 Rxe3 22.Rxe3 Qc2+> 23. Kh3?

Feb-11-10
Premium Chessgames Member
  Once: <Domdaniel: < a fork-conjugated pair > I don't want to even imagine what conjugal pair-forking might consist of ...>

LOL! And it's been a while since this site has done that for me.

Feb-11-10  dzechiel: <Dr. J: John (or anyone), what happens after <Bxc3 21.Qxc3 Rxe3 22.Rxe3 Qc2+> 23. Kh3?>

23...Qxh2+ 24 Kxg4 Qh5#

Feb-11-10
Premium Chessgames Member
  agb2002: <Once: <Domdaniel: < a fork-conjugated pair > I don't want to even imagine what conjugal pair-forking might consist of ...>

LOL! And it's been a while since this site has done that for me. >

I had to make an effort to keep the serious tone...

Feb-11-10  cyclon: This is exceptionally nice. 20. -Rxe3 (only so!) 21.Rxe3 Qc2, Black wins immediately material, because besides threat is 22. -Qxd2+, White Queen is ALSO pinned - therefore Qd5+ is impossible. I don't see any reasonable move for White; 22.Qxc2 Nxe3+/22.Rd1 Nxe3+/22.Re2 Qxd2 23.Rxd2 Ne3+/22.Rf2 Qxd2 23.Rxd2 Nxe3+ 24.K- Bxc3/22.Rd3 Ne3+/22.Nc/ge4 Nxe3+/22.Nb1? Nxe3+/22.Re8+ Rxe8 - in ALL these instances White loses a healthy piece or more.
Feb-11-10  mrsaturdaypants: I'm trying to look for candidate moves - I swear I am. But I just keep getting drawn back to Rxe3, with the aim of setting up a knight fork on the same square. If that's the wrong start, I'm just not going to find the right solution today.

20...Rxe3 21 Rxe3 Qc2 22 Re2 (22 Qxc2 Nxe3, and black will be up a bishop) Qxd2 23 Rxd2 Ne3+ 24 Kg1 Nxf1, and black will be up a bishop. If 25 Kxf1, then Bxc3.

So the knight on c3, attacked by the g7 bishop and protected only by the white queen, is one of the keys to the position. This is a variation on "loose pieces drop off," and on overloading, but harder for me to see. I can't say that I recognized the c3 knight as vulnerable when I went down this line.

Time to check.

Feb-11-10
Premium Chessgames Member
  whiteshark: I didn't see <21...Qc2!!> It would have knocked my socks off.
Feb-11-10  Dr. J: <<dzechiel: <Dr. J: what happens after Bxc3 21.Qxc3 Rxe3 22.Rxe3 Qc2+> 23. Kh3?>

23...Qxh2+ 24 Kxg4 Qh5#>

Oops.

Feb-11-10  lzromeu: 20 ...Nxe3+ 21.Rxe3.rxe3 22.Qx3.Qc2+
and black win the knight
My way: Material advantage 3

The solution (K for R) material advantage 2

Or I miss something?

Feb-11-10  wals: Rybka 3 1-cpu: 3071mb hash: time 9 min: depth 20:

(-3.86) 20... Bxc3
21. Qxc3 Rxe3 22. Rxe3 Qc2+ 23. Qxc2 Nxe3+ 24. Kg1 Nxc2 0-1

Feb-11-10  MaxxLange: fail for me today

Rook x Bishop was an obvious idea, but I could not find the key move 21...Qc2!

Feb-11-10  YouRang: Got it after a few go-arounds. Of course the e3 square is the "hot spot", but what to do with it?

Eventually, it occurred to me that ending up with a knight there (i.e. capturing first with the rook) is promising because it would be check. At that point, I looked to see if there would be any way to set it up to be a knight fork, and sure enough, after 20...Rxe3 21.Rxe3, we have 21...Qc2! threatening the white queen and knight.

Of course my queen is defended tactically (22.Qxc2 Nxe3+ royal fork wins a piece). But the hanging knight on c3 guarantees that white loses a piece either way.

Feb-11-10
Premium Chessgames Member
  patzer2: For today's Thursday puzzle solution,
Tkachiev's 20...Rxe3!! 21. Rxe3 Qc2! uses a deflection followed by a pin to set up a winning Knight fork combination.
Feb-11-10  RandomVisitor: 17.Bh6! would be a nice improvement:

1: Jiri Jirka - Vladislav Tkachiev, European Club Cup 2009


click for larger view

Analysis by Rybka 3 :

<[+0.76] d=18 17...Bxg2> 18.Kxg2 Qf5 19.Qd5+ Kf8 20.Bxg7+ Kxg7 21.f4 Nd7 22.Rae1 Nc5 23.Qxf5 gxf5 24.Nxc5 dxc5 25.Nd5 Rxe1 26.Rxe1 Rd8 27.Nxc7 Rd2+

Feb-11-10  Nullifidian: Here's my solution:

20... ♗xc3 21. ♕xc3 ♖xe3 22. ♖xe3 ♕c2+ 23. ♕xc2 ♘xe3+ with 24. ♘xc2 on the next move, leaving Black up a piece.

Checking....

Six of one and a half dozen of the other. Though I didn't play Tkachiev's moves, both move orders give Black a piece advantage.

Feb-11-10  Eduardo Leon: Nullifidian, your answer was actually <better> than whatt Tkachiev played.
Feb-11-10
Premium Chessgames Member
  patzer2: <Nullifidian> Nice alternative indeed is 20...Bxc3! 20... Bxc3 21. Qxc3 Rxe3 22. Rxe3 Qc2+! 23. Qxc2 (23. Kg1 Qxh2#; 23. Kh3 Qxh2+ 24. Kxg4 Qh5#; 23. Kf3 Nxh2#) 23... Nxe3+ .
Feb-12-10  TheaN: Thursday 11 February

<20....?>

Target: 3:30;000
Taken: 2:12;644

Material: =

Candidates: Rxe3, Nxe3, Bxc3, Qc2.... <[Rxe3]>

-ML-
Not too much to explain here; White's coordination is rather bad in this position and Black would be willing to employ a double attack here or there. Starting with the nice:

<20....Rxe3!> Black iniates a good combination with the key move only on the next move.

<21.Rxe3> it's difficult to consider what else. With Rxe1, Black can easily escape peril and go a piece up.

<21....Qc2!!> playing on deflection of the Queen: 22.Qxc2 Nxe3 with an exchange interest. The best probably is:

<22.Re2 Qxd2 23.Rxd2 Bxc3 > which should win for Black. Time to check.

Feb-12-10  TheaN: 3,5/4

Of course, everything is correct sans the fact that my variation is just not winning: after 23....Ne3, which was the power of the puzzle throughout the entire variation, ends it right there and then.

Also, but alas not played, 20....Bxc3! is stronger, employing the same combination with more simplification.

Feb-12-10  turbo231: I'm getting nowhere fast on this puzzle, and it's only a medium (Thursday). Today is Friday, i'm tempted to play the puzzle. But i must be strong and try to solve it on my own.
Feb-12-10  turbo231: I think i see it now is it a queen sac, then rxb rxr nxr forking the king and queen. But i don't think rybka is going to fall for that, it must be something else. But this is all i can come up with, at least it's something.
Feb-12-10  turbo231: I offered the queen sac too early.
Jan-01-11  notyetagm: J Jirka vs Tkachiev, 2009

<patzer2: For today's Thursday puzzle solution, Tkachiev's 20...Rxe3!! 21. Rxe3 Qc2! uses a deflection followed by a pin to set up a winning Knight fork combination.>

One of the best knight fork combos I have ever seen.

Game Collection: KNIGHT FORKS!

Jan-02-11  notyetagm: This game ends with a *tremendous* tactical sequence by Tkachiev.

Magnificent!

Jan-02-11  notyetagm: Game Collection: KNIGHT FORKS: TRADING DOWN ON THE FORKING SQUARE

J Jirka vs Tkachiev, 2009 20 ... Re8xBe3!! trades down on the e3-forking to overload d2-Q

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