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Boris Avrukh vs Tornike Sanikidze
European Team Championship (2009), Novi Sad SRB, rd 8, Oct-29
Catalan Opening: Closed Variation (E06)  ·  1-0

ANALYSIS [x]

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sac: 24.Rxg7+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Oct-30-09  regi sidal: Very nice king-side attack by Boris.

20. Qf1! Very interesting pawn sac, abandoning his queen-side.

I wonder where black made his last decisive mistake.

Feb-28-19  kungfufighter888: discovered and double check checkmate the black king !!!!!!!!!!!!!!!!!!!!!!!!!
Feb-28-19  Walter Glattke: 24.Rg6? exf5 / 24.fxe6? Bf8 / 24.Rxg7+ Kxg7 25.Rg1+ Kh8 26.Nh4 Rg8 27.Ng6+ Kg7 28.Ne5+ Kf8 29.Qh6+ Ke8 30.Rxg8# or 27.-Rxg6 28.fxg6 mating /28.fxe6 Ra6!? 28.-Rg8 29.Ng6+ (or Rxg1+ black wins) 29.-Rxg6 30.Rxg6 Bf8 perpetual after 31.Rxh6+ Bxh6 32.Qxh6+ Kg8 33.Qg6+
Feb-28-19
Premium Chessgames Member
  patzer2: For today's Thursday puzzle (24. ?), I visualized the first two moves of White's winning combination 24. Rxg7+!! Kxg7 25. Rg1+ Kh8.

However, I did not consider or see the key third move in the combination 26. Nh4! +- (mate-in-11, Stockfish 10). I should've at least considered it, but perhaps because I've been taught "Knights on the rim are dim" I didn't give 26. Nh4! a single thought. Now I realize there are exceptions to that rule, as the Knight is far from dim after 26. Nh4! +-.

Since all moves other than 26. Nh4! lose for White, I scrapped the strong winning game continuation and went instead for the win of a mere pawn with 26. Qh6 Bf8 27. Qxf6 ± to +- (+1.33 @ 32 ply, Stockfish 10).

P.S.: Black's decisive error according to the computer was 23...Rfe8?, allowing 24. Rxg7+!! Kxg7 25. Rg1+ Kh8 26. Nh4! +-. Necessary instead was 23...exf5 24. Qh6 Rf7 25. Ne5! Raf8 26. Nxf7 Rxf7 27. Qf4 Qe6 28. Qb8+ Bf1 29. Qd8 ⩲ (+0.57 @ 38 ply, Stockfish 10).

One move earlier, 22...exf5 23. Nh4 Qc2 24. Qh3 Rf7 25. Nxf5 Kh8 26. Rc1 Qe4+ 27. f3 Qe6 28. Rg3 Bb4 29. Rcg1 g5 = (0.00 @ 36 ply, Stockfish 10) would've given Black a level position.

Feb-28-19  Lambda: Got up to 27...Kh7, but then I had 28.Nxe7, after which black can bail out to an inferior endgame after 28...Rg8. White should still win, but it will require some technique. (And since this justifies the sacrifice, there's always the opportunity to "I have a good move, let's look for a better move" once the position is actually in front of you.)
Feb-28-19  saturn2: I saw 24. Rxg7+ Kxg7 25. Rg1+

25...Kh8 26. Nh4 threatening Ng6+ I stopped here because it seens hopeless for black

25...Kf7 26. Qh5+ Kf8 27. Qh6+ Kf7 28. Rg7+ Kf8 29. Qxh7 Qb1+ 30. Kg2

25.. Kf8 26 Qh6+ similar to previous

Feb-28-19  saturn2: Here lines after 26. Nh4

26...Bf8 27. Ng6+ Kg7 28. Ne5+ Kh8 29. Nf7#

26.. h5 27. Ng6+ Kh7 28. Qxh5+ Kg7 29. Ne5+

26.. e5 27. Ng6+ Kg7 28. Nxe5+ (my favorite move) Kf8 29. Qh6#

Feb-28-19
Premium Chessgames Member
  agb2002: White has a knight for a bishop and a pawn.

White has Rxg7+ and Qh6.

In the case of 24.Qh6 Bf8 (24... g5(6) 25.fxg6 wins) 25.Qxf6 Qd6 offers some resistance.

-----

In the case of 24.Rxg7+ Kxg7 (24... Kf8 25.Qxh7 and mate next) 25.Rg1+ (25.Qg3+ with the idea 25... Kh8 26.Ne5 is interesting but seems to fail after 25... Kf7) 25... Kh8 (25... Kf7 26.Qxh7+ Kf8 27.Rg8#; 25... Kf8 26.Qh6+ Kf7 27.Qg7#) 26.Nh4:

A) 26... Rg8 27.Ng6+

A.1) 27... Rxg6 28.fxg6 and mate in three.

A.2) 27... Kg7 28.Ne5+ Kf8 (28... Kh8 29.Nf7#) 29.Nd7+ wins decisive material.

B) 26... Bb4 27.Ng6+ Kg7(8) 28.Ne5+ as above.

C) 26... Qc7 27.Ng6+ Kg7(8) 28.Ne5+ and mate in two.

D) 26... Rd8 27.Ng6+ Kg7(8) 28.Ne5+ Kf8 29.Qh6+ Ke8 30.Qh5+ Kf8 31.Qf7#.

E) 26... h6 27.Nf3

E.1) 28... Bf8 29.Qg3 wins.

E.2) 28... Kh7 29.Qh5 Rg8 30.Qf7+ Kh8 31.Rg6 Qb1+ 32.Ng1 (32.Kg2 Rxg6+ 33.fxg6 Qxg6+ 34.Qxg6 Rg8) 32... Qxg6 33.Qxg6 wins.

-----

I'd play 24.Rxg7+.

Feb-28-19
Premium Chessgames Member
  agb2002: My line E.2 is flawed due to 32... Qe4+.

I discarded 27.Ng6+ because after 27... Kh7 28.Nxe7 (28.fxe6 looked slow to me) 28... Rg8 Black seemed to have enough defense when actually 29.Qh5 does win now according to Stockfish.

Feb-28-19
Premium Chessgames Member
  Breunor: I did the exact same as Patzer2; saw the first two moves but didn't see Nh4, and went with Qh6 and Qxf6.

Nice puzzle.

Feb-28-19  I Like Fish: Look how helpless the all black pieces have been placed.
Feb-28-19
Premium Chessgames Member
  perfidious: Two kibitzes here elucidate the importance of critical thinking in one's approach, as opposed to following dogma.
Feb-28-19
Premium Chessgames Member
  Check It Out: What <patzer2> said.
Feb-28-19
Premium Chessgames Member
  Diocletian: A very enjoyable attack on this Monday! This is how I like to win too. I calculated to 26.Nh4 and stopped there because that's where I would have made the sac otb.
Feb-28-19
Premium Chessgames Member
  Diocletian: I ran the last part of the game thru Arena and was surprised that all my engines took longer than I did to sac. Hermann found it first, Ruffian second, AnMon next, and SOS is still thinking.
Feb-28-19
Premium Chessgames Member
  perfidious: Better send out an SOS!
Feb-28-19  Cibator: Boris sure applied the tourniquet on poor old Tornike.

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