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Boris Spassky vs Lajos Portisch
Portisch - Spassky Candidates Quarterfinal (1980), Mexico City MEX, rd 9, Apr-22
Caro-Kann Defense: Classical Variation. Main lines (B18)  ·  1-0



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Kibitzer's Corner
Aug-06-15  Howard: According to the Informant, 29...Nb6 was a significant error.

But could Black have held the draw, anyway ?

Premium Chessgames Member
  offramp: In this position

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the free program Stockfish 8 opines thuslywise:

29...g6 (0.35) Depth: 24/42 00:00:40 8041kN

After 29...Nb6 Stockfish becomes surly and uncommunicative. Eventually it begrudges a new evaluation:

30.Kb3 Nd7 (1.18) Depth: 26/53 00:01:29 17982kN.
Later, Stockfish think Black might have done better:

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1. (1.11): 36...Kf6 37.Nxc5 Nxc5 38.Bxc5 Rxc5 39.f4 ...

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2. (1.29): 36...a5 37.Nxc5 axb4+ 38.axb4 Nxc5 39.bxc5 Rxc5 40.Kb4 Rc7

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3. (1.31): 36...Bd6 37.Bxd6+ Kxd6 38.Nc5+ Kxc5 39.Rxd7 Rg8 40.Ra7 g6 41.Rxa6 gxh5 42.Rxe6 Rxg2 43.Re5+ Kb6 44.Rxf5.

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Premium Chessgames Member
  woldsmandriffield: After 29..g6 White emerges with a superior pawn structure: 30 hxg6 Rxg6 31 g3 Ne5 32 Bxe5 Bxe5 33 f4 Bg7 Nevertheless the computer defends this quite easily eg 34 Rd1 e5 32 fxe5 Bxe5 36 Rd5 Bd6 as g3 is weak and the chances to create a passed k-side pawn give counterplay.
Premium Chessgames Member
  woldsmandriffield: Spassky's 32 bxc5 was a good decision enabling him to activate the Knight but he didn't follow the plan through: 34 Ng6+ Ke8 35 Bxg7 picks up a key pawn as Black has no useful discovered check.

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