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Tigran Vartanovich Petrosian vs Svetozar Gligoric
Zurich Candidates (1953), Zurich SUI, rd 19, Oct-04
King's Indian Defense: Saemisch. Closed Variation (E87)  ·  1-0
ANALYSIS [x]

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Kibitzer's Corner
Sep-06-06  nescio: I don't remember if it was Vukovic or Petrosian himself who pointed out the unexpected sacrifice 37...Rxe4! After 38.fxe4 Nxe4 39.Qe1 Qxd5 White's king is in considerable trouble. I seem to have lost or mislaid Bronstein's tournament book, but he gave several variations to prove it. Perhaps someone can post them here. I will only say that 40.a3 Nd2+ 41.Ka1 Nb3+ 42.Kb1 Nd2+ gives Black a perpetual and he could perhaps try for more with 42...Nxc1 or 42...Qd2.

Of course Gligoric will have been in time trouble, so he missed the sacrifice or rejected it because he had no time to calculate.

Nov-12-06  mack: What's wrong with 19.Bxa6?
Oct-20-07  Gameoverziggy: Why give away one of your bishops for a knight on the rim especially when the black bishop on a6 becomes very powerful
Mar-29-08  NM James Schuyler: There's a little more to it than that. 19. Bxa6 allows white to play 20.Nf5, which was presumably his plan with 18.Ng3. In fact, Petrosian may well have intended 19.Bxa6 when he played it (otherwise Ng3 has no point). If so, I can't figure out why he changed his mind.
Dec-14-08  Poisonpawns: It was Bronstein who pointed out the rook sacrifice 37..rxe4
May-27-17  cwcarlson: 18.♘d4! ed 19.♗d4 h6 20.♕f4 ♗g5 21.♕g3 ; 19...♘h5 20.♕g2+ ♕g5 (20...♔f2 21.♕g4 ) 21.♕g5+ ♗g5 22.♖g1 .
May-31-17
Premium Chessgames Member
  plang: Earlier in the tournament in a draw against Geller Gligoric had introduced the idea of attempting to exchange his "bad" bishop with 11..Bf6. Against Geller Gligoric had played 12..Nd7; here he tried 12..g5 making no attempt to hold up White's queenside attack. This is not an improvement and has not been repeated. 15..Na6?! misplaced the knight; an alternative was 15..Kh8 with the idea of using the open g-file. 16..bxc 17 dxc..Qe8 18 Nc1..Qxc6? 19 Bb5..Qb7 20 Bxa6..Qxa6 21 Qd5+ would have been winning for White.

<mack: What's wrong with 19.Bxa6?> According to Wood White had originally intended 19 Bxa6..Bxa6 20 Nf5 but then realized that 20..Ne8 would have been a satisfactory response.

19..Nc5?! allowed a weakening of Black's queenside; perhaps 19..Nd7 would have been better. 26 Qxc7..Rfc8 27 Qa5..Bf2 would have given Black a dangerous initiative.

<nescio: I don't remember if it was Vukovic or Petrosian himself who pointed out the unexpected sacrifice 37...Rxe4! After 38.fxe4 Nxe4 39.Qe1 Qxd5 White's king is in considerable trouble. .... I will only say that 40.a3 Nd2+ 41.Ka1 Nb3+ 42.Kb1 Nd2+ gives Black a perpetual and he could perhaps try for more with 42...Nxc1 or 42...Qd2.>

No reason for Black to take the perpetual. After 42..Nxc1 43 Nxc1 (43 Qxc1..Qb3 44 Qd2..Rd5 45 Qc1..Qxc2+ 46 Qxc2..Rd1+) 43..Rc5 44 Bd3..Bxd3 45 Nxd3..Qxd3 46 Qe2..Qxe2 47 Rxe2..Kg7 48 b4..Rd5 Black is clearly better.

Another nice variation is 37..Rxe4 38 fxe..Nxe4 39 Qe1..Qxd5 40 b3..Nd2+ 41 Kh1..Nxb3+ 42 Kb2..Rxa2+ 43 Kxa2..Nxc1+ 44 Kh1..Qa8+ 45 Kb1..Qa2+ 46 Kxc1..Qxc2#.

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