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Viktor Korchnoi vs Tigran Vartanovich Petrosian
Curacao Candidates (1962), Willemstad CUW, rd 2, May-03
Spanish Game: Closed Variations. Chigorin Defense (C97)  ·  1/2-1/2
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Feb-27-09  Riverbeast: <Petrosianic> claims (on the Keres-Petrosian game kibitzing from Curacao 1962) that black is won in the final position after 36...e4 (and this is proof that Petrosian wasn't fixing at Curacao...That he took draws in won positions quite commonly!) This so called 'master' clearly doesn't understand the simplest chess positions....

After 36...e4 white simply has to keep checking with Ra8+ and Ra7+

If black moves his king toward the rook with ...Kf7 and ...Ke8, then white plays fxe4....after Bxc3, then white plays e5

The g7 pawn is hanging, as is the h7 pawn, so black would have to play ...Nf5

Then after Bf4 white threatens g4...The position is opening up for the rook and two bishops, and the passed 'c' pawn can easily be blockaded with Bc2 or Bc1

If after 37. Ra8+ black interposes with 37....Nc8, then Bxe4 and white is winning

If he interposes with 37....Rc8 then white plays Rxc8+ Nxc8 //fxe4 Bxc3 //Ba2 Nb6 // Bc7 and white wins the c pawn

Or, after 37...Rc8, white can play for the win with 38. Rxa6

There is probably more to this position than my analysis indicates....I'm not using a computer, just looking at it in my head.....But there is no way black is 'winning' after 36...e4

Feb-27-09  Riverbeast: <Lt. Surena> If you want to prove me wrong, check my analysis with rybka.....I'd be curious to know how the computer evaluates the position after 36...e4

I wish I had eaten some of Fischer's 'oranges'....Then maybe I'd be a better chessplayer

But even a fish like me can see that <Petrosianic> is a b.s. artist

May-23-09  nimh: New game, Blitz:1'+1"


click for larger view

Analysis by Rybka 3 Human 32-bit: 22-ply

1. (-0.32): 1...e4 2.Ra8+ Kf7 3.Ra7+ Kg6[] 4.fxe4 Rb6 5.Ba2 Bxc3 6.Bxd6 Rxd6 7.Bxc4 Rd1+ 8.Kh2 Be5+ 9.g3[] Rd2+ 10.Kh1 Rd4 11.Bb3 Rb4 12.Bc2 Rc4 13.Bb3 Rc6 14.Kg2 Kf6 15.Ra8 h5 16.Rf8+ Ke7 2. = (0.00): 1...g6 2.Ra8+ Kg7 3.Ra7+ Kg8[] 4.Ra8+ Kg7 5.Ra7+ Kg8[] 6.Ra8+ Kg7 7.Ra7+ Kg8[] 8.Ra8+ Kg7 9.Ra7+ Kg8[] 10.Ra8+ Kg7 11.Ra7+ Kg8[] 12.Ra8+ Kg7 13.Ra7+ Kg8[] 14.Ra8+ Kg7 15.Ra7+ Kg8[] 16.Ra8+ Kg7 3. = (0.00): 1...Nf5 2.Kh2 Rd6 3.Be4 Ne3 4.Bf2 Nf1+ 5.Kg1 Rd1 6.Bc5 Ng3+ 7.Kf2 Nxe4+ 8.fxe4 Rd3 9.Rxa6 Rxc3 10.a5 Rc2+ 11.Kf3 Rc3+ 12.Ke2 Rc2+ 13.Kf3 Rc3+ 14.Ke2 Rc2+ 15.Kf3 Rc3+ 16.Ke2 Rc2+

Where is the win? :)

Jan-25-14
Premium Chessgames Member
  zydeco: 19.....Qa5 is interesting. 19....a5 looks good -- it prevents a5, keeps the queen on a good square on c7, and doesn't create any weaknesses. I think it's a sign of how cautious Petrosian is that he doesn't want to make a pawn move he doesn't have to and basically waits with ....Qa5, returning the queen to c7 once white no longer threatens a5.
Jan-23-17
Premium Chessgames Member
  NeverAgain: SF and Houdini don't see a win (or even a meaningful advantage) for Black in the final position either.

8 GB hash and 5-men Syzygy each.

asmfish 170117 64 POPCNT:

36...e4 37.Ra8+ Kf7 38.Ra7+ Ke8 39.Ra8+ Kd7 40.Ra7+ Kc8 41.Ra8+ Kb7 42.Bxd6 Rxd6 43.Bxe4+ Kc7 44.Ra7+ Kb6 45.Rb7+ Ka5 46.Rb4 ... = (-0.18) Depth: 59/88 06:32:26 597336 MN, tb=181206521

Eval decreased from -0.37 at d=20-46 to practically zero.

Houdini 5.01 Pro x64-popcnt Tactical:

36...e4 37.Ra8+ Kf7 38.Ra7+ Ke8 39.Ra8+ Kd7 40.Ra7+ Kc8 41.Ra8+ Kb7 42.Bxd6 Kxa8 43.Bxe4 Kb7 44.Bb4 ... (-0.45) Depth: 46/105 05:31:55 717503 MN, tb=41997537

Steady -0.36 up to d=37, then up and down a bit, then steady at -0.45 from d=43. A less-than-a-pawn advantage is meaningless in the endgame; and the fact that the eval does not budge a bit for scores of iterations points to a draw.

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