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Gideon Stahlberg vs Toivo Salo
Moscow ol (Men) fin-B (1956), Moscow URS, rd 2, Sep-11
Bogo-Indian Defense: Exchange Variation (E11)  ·  1-0

ANALYSIS [x]

FEN COPIED

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sac: 43.Bxc8 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Jul-01-20
Premium Chessgames Member
  boringplayer: I went with 44. Bd7, missing 44...Nd6 :(
Jul-01-20  TheBish: Ironically, this was easier than Monday's. I knew within five seconds that the solution had to be 43. Bxc8!, and it took about 10 seconds more to confirm that the temporary queen sac was winning because White will soon make a new queen, netting a rook.
Jul-01-20  stacase: Unlike <TheBish> I did finally notice that White's c7 Pawn and removal of Black's Rook was key. The only consideration was where on move 44 to move the Bishop to make it work.
Jul-01-20  Matloc: Nice puzzle. The game was already lost, anyway, but...

40. Bd5

No mercy! It's a pity not to continue the attack.

Jul-01-20
Premium Chessgames Member
  agb2002: White has a bishop and a pawn for a knight.

Black threatens Rxc7.

The c-pawn suggests Bxc8, Qc6 and Qb7.

In the case of 43.Bxc8:

A) 43... Nxe4 44.Be6 wins decisive material.

B) 43... Qxc8 44.Qc6 looks overwhelming.

Jul-01-20  saturn2: 43. Bxc8 Qxc8 (Nxe4 44.Be6 gets white back the queen and has won a rook) 44. Qc6 and white is an exchange up.
Jul-01-20  Brenin: Not too difficult today. In the middle game Black had too many weak pawns (c6, f5), and his N never found a good square (d5, e4), whereas White's B was dominant on f3. The well-prepared breakthrough 34 d5 was critical.
Jul-01-20
Premium Chessgames Member
  Predrag3141: They switched the days around so far this week. This should have been on Monday.
Jul-01-20  Matloc: @Brenin:"The well-prepared breakthrough 34 d5 was critical."

Indeed, that punishes the wrong pawn support: 33... g6

Jul-01-20  King.Arthur.Brazil: The Black position is so passive, that the advance 34.d5! gives white a position advantage which becomes materially true after 39.♖e5!. For example: 39...♕c8 40.♕g6 which threat 41.♖c8+ or 41.♗e4. This leads to forced 39...♕g8 and game over after 5 moves. Note that if Black would played 42...♕f7 43.♖e7 (43...♘f6 44.♗xc8) The end.
Jul-01-20
Premium Chessgames Member
  Predrag3141: <I went with 44. Bd7, missing 44...Nd6 :(>

If it's any consolation, 44 Bd7 Nd6 45 Re8 still wins because White queens his c-pawn, the queens are traded and White's wins the a-6 pawn. The resulting endgame with queenside pawns racing is made to order for bishop vs knight.

Funny thing about Stockfish: It gives a main line where White eventually wins the knight for the a-pawn, stops Black's b-pawn and is still up a pawn on the kingside. The evaluation? only +2.49. Should be +133.00 or something like I sometimes see.

Jul-01-20  mel gibson: I didn't look long enough to see the trick in this one.

Stockfish 11 says:

43. Bxc8

(43. Bxc8
(♗g4xc8 ♘f6xe4 ♗c8-e6 ♕g8-f8 ♖e5xe4 ♔h8-h7 c7-c8♕ ♕f8xc8 ♗e6xc8 ♔h7-g6 ♗c8xa6 ♔g6-f5 ♖e4-e2 ♔f5xf4 ♗a6xb5 h6-h5 a5-a6 ♔f4-g5 a6-a7 ♔g5-f6 a7-a8♕ ♔f6-g6 ♕a8-f8 ♔g6-h7 ♗b5-d3+ ♔h7-h6 ♕f8-f4+ g7-g5 ♕f4-f6+) +M15/60 44)

mate in 15.

Jul-01-20  saturn2: <Oredrag3141 t's any consolation, 44 Bd7 Nd6 45 Re8 still wins because White queens his c-pawn, the queens are traded and White's wins the a-6 pawn>

I have to believe you or Stockfish.
However before your post I played the line for myself and concluded it is a draw because the knight wins the pawn on a a5.

43. Bxc8 Nxe4 44. Bd7 Nd6 45. c8=Q Nxc8 46. Re8 - Qxe8 47. Bxe8 Nd6 48. Bc6 Nc4

Jul-01-20
Premium Chessgames Member
  Predrag3141: <saturn2: I have to believe you or Stockfish>

The line you gave, with 45 c8=Q, is not what I meant. On move 45 I am suggesting Re8.

Jul-01-20  RandomVisitor: After 27.a4 black appears to have equal chances.


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Stockfish_20062710_x64_modern:

<50/74 20:40 0.00 27...g5 28.fxg5 hxg5 29.Qc2> Nd5 30.Bxd5 Qxd5 31.a5 Rf6 32.Qb2 c5 33.axb6 axb6 34.Rb3 Rcc6 35.Rdd3 Kh7 36.dxc5 Qxc5 37.Rd8 Qc1+ 38.Qxc1 Rxc1+ 39.Kf2 Rc2+ 40.Kf3 f4 41.exf4 Rxf4+ 42.Kg3 Rff2 43.Rd7+ Kh8 44.Kg4 Rxg2+ 45.Kf5 Rc5+ 46.Kg6 Rc6+

Jul-01-20  RandomVisitor: Better would have been 17.Bxc4.


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Stockfish_20062710_x64_modern:

<40/63 04:03 +1.23 17.Bxc4 Nd5 18.Rfc1> Rb8 19.Qd2 a5 20.Bb3 Ra8 21.a4 Nb4 22.Qb2 Qe8 23.h3 Kh8 24.Bxe6 Qxe6 25.Qb3 Qe7 26.Kh2 Rae8 27.Rb2 g6 28.Rc5 b6 29.Rc1 Qe6 30.Qxe6 Rxe6 31.g4 Nd5 32.Rb3 Rc8 33.Kg2 Rc7 34.Kf3 Kg7 35.h4 c5 36.g5 cxd4

Jul-01-20  Cheapo by the Dozen: At first glance White wind up ahead by the Exchange in a won endgame. But wait -- there's more! Black doesn't have time to save his night, because iif he tries an innocuous move like 44 ... Qa8, it's so innocuous that White has time to play 45 Rxe4 (i.e. RxN), and queen the pawn later.
Jul-02-20  RandomVisitor: After 7.e3 the machine likes 7...b6


click for larger view

Stockfish_20062710_x64_modern:

<63/91 13:43:50 +0.20 7...b6 8.cxd5 Nxd5> 9.Rc1 Bb7 10.Bd3 Nf6 11.0-0 c5 12.Rfd1 Nbd7 13.Qe2 cxd4 14.Nxd4 a6 15.f3 Qe7 16.Qf2 Rfd8 17.Be2 h6 18.e4 Ne5 19.Nb3 Rxd1+ 20.Nxd1 Qd6 21.Qe3 Rd8 22.g3 Ng6 23.Nf2 a5 24.Rd1 Qc7 25.Rxd8+ Qxd8 26.Qc3 Ne7

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