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Boris Spassky vs Robert James Fischer
Fischer - Spassky World Championship Match (1972)  ·  Nimzo-Indian Defense: Normal Variation. Gligoric System Bernstein Defense (E56)  ·  1-0
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Given 52 times; par: 110 [what's this?]

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Boris Spassky vs Robert James Fischer (1972)

Kibitzer's Corner
< Earlier Kibitzing  · PAGE 36 OF 36 ·  Later Kibitzing>
Premium Chessgames Member
  Tiggler: <RandomVisitor> The position in your last diagram is one that I had on my analysis board a while ago. My conclusion: white wins.

Here is one continuation:

51. ...g2
52.Qg8 Kf5
53.Qd5+ Kf4
54.Qd4+ Kg5
55.Qe5+ Kg6
56.Bd4 Kf7
57.Qd5+ Kf8
58.Kb6 Qb1+
59.Kxa5 Qg6
60.Bc5+ Kg7
61.Qd7+ Kg8
62.Qd8+ Kh7
63.Qe7+ Kh6
64.Be3+ Kh5
65.Qe5+ Kg4
66.Qf4+ Kh3
67.Bf2 g1Q
68.Qe3+ Kg4
69.Bxg1 (+M22 t.b.)

click for larger view

Apr-23-16  QueensideCastler: <jnpope> I can verify 7-piece positions if you can send few FEN positions from that FinalGen tree.

Positions that need further inspections.

Huge difference between 6-Men Nalimov and 7-Men Lomonosov respectively.

Premium Chessgames Member
  AylerKupp: <<RandomVisitor>Final gen just throws its hands up and says "I don't know".>

True. Once FinaGen's requirement of only one piece (other than kings) per side is violated, i.e. by promotion, then it considers the position "Unsolved". I'm actualy surprised that it didn't throw up its hands after 50...f1Q and continued to 51.b8Q.

Premium Chessgames Member
  Tiggler: <AylerKupp>:<I'm actualy surprised that it didn't throw up its hands after 50...f1Q and continued to 51.b8Q.>

Perhaps because there was only one piece per side until 51.b8Q?

Premium Chessgames Member
  jnpope: <QueensideCastler: I recommend verify the results with 7-Men Lomonosov EGTBs>

Excellent. Installed onto my Android. That should help.

Apr-24-16  QueensideCastler: Glad i could help. 1 more additional piece (over nalimov) should add tremendous more insight/assistance to verify FinalGen tree.
Premium Chessgames Member
  cro777: <RandomVisitor: Consider this line from the position after 39.b6:>

39. ... a5 40.Kg4 g6 41.Be7 f5+ 42.Kg5 Kxe3 43.Kf6 f4 44.Kxe6 f3 45.Bc5+ Ke4 46.Kd6 g5 47.Kc7 g4 48.Kxb7 g3 49.Kc6 f2 50.b7 f1Q 51.b8Q

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The line may continue:

51...g2 52.Qg8 Kf5 53.Qd5+ Kf4 54.Qd4+ Kg3 55.Kb6

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And White will capture the a5-pawn reaching a theoretically won position.

For example, 55...Kh3 56.Qe3+ Kh4 57.Kxa5

click for larger view

White mates in 29 (Lomonosov tablebases).

Premium Chessgames Member
  Tiggler: <cro777> do you agree that black is lost after 39...a5?
Premium Chessgames Member
  cro777: <Tiggler> I would agree that Black is lost after 39...a5.
Apr-25-16  RandomVisitor: After 39.b6, black's plan should be to exchange off the white pawn by advancing his own set, keeping his king between the white king and c8. After black forces the exchange, he just abandons his remaining kingside pawn(s) and marches his king to c8 and his fortress. Draw.

click for larger view

Komodo-9.42-64bit: syzygy-6

+4.29/60 39...g6 40.a5 e5 41.Kg4 Kd5 42.Ba3 Ke6 43.Kg3 Kd7 44.Kf3 Ke6 45.Bf8 Kf5 46.e4+ Ke6 47.Kg2 f5 48.Kf2 g5 49.Bb4 fxe4 50.Ke3 g4 51.Be1 Kd7 52.Kxe4 Kd8 53.Bh4+ Kd7 54.Kxe5 g3 55.Bxg3 Kd8 56.Bh4+ Kd7 57.Kf6 Kd8 58.Be1 Kc8 59.Ke7 Kb8 60.Kd7 Ka8 61.Kd6 Kb8 62.Bh4 Kc8 63.Bf2 Kb8 64.Kd5 Ka8 65.Ke4 Kb8 66.Bg3+ Ka8 67.Ke5 Kb8 68.Be1 Ka8 69.Bf2 Kb8 70.Bc5 Kc8

Apr-25-16  QueensideCastler: Apparently it appears the white bishop is worth slightly less as a result of wrong a8 color in addition c8 safe square for the black king. Black centralized king shall compensate for the remaining half a pawn, - e.g. let say subtract 0.5 points to the base value of the bishop 3.0 or (3.25) 2.5 and 2.75 points respectively.

The white bishop is not at its peak value because black have the fortress idea at disposal as an escape route.

click for larger view

Premium Chessgames Member
  Tiggler: <QueensideCastler: Apparently it appears the white bishop is worth slightly less as a result of wrong a8 color in addition c8 safe square for the black king. Black centralized king shall compensate for the remaining half a pawn, - e.g. let say subtract 0.5 points to the base value of the bishop 3.0 or (3.25) 2.5 and 2.75 points respectively.>

Apparently it appears that seemingly this is the sentence of the month - e.g., let's say, respectively!

Premium Chessgames Member
  cro777: The critical moment of the game.

In the position after 39.b6 Fischer missed the last chance to hold the draw:

click for larger view

39f5? was the decisive mistake.

The drawing method was explained above by <RandomVisitor>: with the kingside pawns off the board, the following position is drawn: White - King any, Bishop any, Pawns a5 and b6; Black Kc8, Pawns a6 and b7.

The following drawing line has been usually suggested:

39e5 40.Kg4 g6

click for larger view

Here, the following lines have been analysed:

41.a5 leads, by transposition, to the line suggested by <RandomVisitor> (39g6 40.a5 e5 41.Kg4)

41.Be7 Kxe3 42.Bxf6 Kd4

Apr-26-16  QueensideCastler: <jnpope> is your <tree> soon verified?
Premium Chessgames Member
  jnpope: <<jnpope> is your <tree> soon verified?>

Unknown. There are still too many active branches. I'll keep you posted. This should end up being a proof by exhaustion (of the FinalGen unresolved lines). Between Rybka 4.1 x64, the FinalGen tablebase and the Lomonosov EGTB this should eventually get "solved".

The ChessBase tree is only the unresolved lines in FinalGen. All definitive wins and draws are truncated with a note; remaining best candidate lines via Rybka eval are bubbled to the top and then played out until they merge to definitive FinalGen positions or hit 7 pieces for an EGTB resolution, otherwise Rybka keeps making best line suggestions, etc.

Sort of tedious, but fascinating in a way...

Premium Chessgames Member
  jnpope: Well, a proof of a draw will be by exhaustion of the FinalGen unresolved lines. All it takes is a single forcing line for White to demonstrate the counter...
Premium Chessgames Member
  garland: Spassky vs Krogius, 1958 Beyond a doubt the source game for the whole Ba5-Bb6 idea. The different move here is 14... Bd7 based on the simple but strong idea of attacking the rook on 15. Bxf6. This was probably part of Bobby's preparation for this game.
Premium Chessgames Member
  RookFile: Gligoric mentions that Fischer had "the red book" (all of Spassky's games), so that one would be in it. I'm sure the Spassky vs. Krogius game was very much on Fischer's mind in preparing 14....Bd7!
Premium Chessgames Member
  AylerKupp: <RookFile> I suspect that by the time of the 1972 match that Fischer was more familiar with Spassky's games than Spassky was.
Premium Chessgames Member
  AylerKupp: <jnpope> How is the search going? I hope that you are still sufficiently fascinated to continue to investigate FinalGen's unresolved lines.
Premium Chessgames Member
  RookFile: I forget where I heard this from, but Fischer also played over all the Steinitz vs. Chigorin games. He figured that Spassky was like Chigorin, and he was like Steinitz.
Premium Chessgames Member
  HeMateMe: I've learned that I'm like NN.
Aug-08-16  QueensideCastler: Bg1 Novelty ⁉

click for larger view

1... h5 2. Ke2 w♔ need to support kingside pawns. (2. Ke4 Transposition) 2... h4 3. Kf3 Bg1N 4. Kg2 Bxf2 5. Kxf2 hxg3+ 6. Kxg3 a6 Stockfish assesses this position as +4.24 | Fortress draw. *

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Oct-15-16  bobbyperez: 39...e5! is the only way to seal the draw.

There was a debate that was happening between grandmasters if 36.Kg4 Ke5 37.Kh5's a draw.

Premium Chessgames Member
  jnpope: <AylerKupp: <jnpope> How is the search going? I hope that you are still sufficiently fascinated to continue to investigate FinalGen's unresolved lines.>

Have no fear. I'm still plugging away at it (as I find time). I'm still interested in solving it, but this isn't a simple solution (obviously, otherwise someone would have done it by now!).

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