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Nikolai Krogius vs Vlastimil Jansa
Chigorin Memorial (1965), Sochi RUS, rd 10, Sep-??
King's Indian Defense: Normal. King's Knight Variation (E60)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 34.Rd8+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Jan-09-07  amuralid: Got it!
Jan-09-07  Amulet: Got it too. The second place and the puzzle too.
Jan-09-07  NBZ: Oh no I'm only second!

The key idea is white gets to play Be5 after black plays Bc7 so the b-pawn promotes. If 35. ... f6 36. Bxb2 Bc7 37. Bxf6 and Be5 next.

Interestingly white has another good move at his disposal. 34. Bc3!? wins the exchange after Bxc3 35. Rd8+ Kg7 36. b8=Q; but the win isn't exactly a walk in the park from then on. Rd8+ is a much quicker neater way to win.

Jan-09-07  chessmoron: Me too, and a interesting play. The black bishop will be captured by the White bishop after a pawn sac.
Jan-09-07  NBZ: It turns out I'm third :(
Jan-09-07
Premium Chessgames Member
  al wazir: The game would continue 36...Bb6+ 37. Kf1 Ba7 38. Be5 Kf8 39. b8=Q+ Bxb8 40. Bxb8, and white has ♗ vs. ♙.

My choice was 34. Bc3 Bxc3 35. Rd8+ Kg7 36. b8=Q Rxb8 37. Rxb8, and white has ♖ vs. ♗+♙. But this doesn't work because black plays 34...Rb1+ 35. Kg2 Kg7.

Jan-09-07  chesslearning: :( I picked Bc3.
Jan-09-07
Premium Chessgames Member
  dzechiel: At first I looked at 34 Bc3 Bxc3 35 Rd8+ Kg7 36 b8=Q Rxb8 37 Rxb8, but that barely breaks even, leaving black with a lot of fight left in him.

So, I decided to see if there was something more in the position. The only forcing moves were 34 b8=Q+ (which just tosses the advanced pawn) and 34 Rd8+. I quickly noticed that after this second move that 34...Bxd8 35 Bc3+ Kg8 36 Bxb2 would effect the exchange of rooks, but that black could then play 36...Bc7 stopping the pawn from promoting. But then 37 Be5! jumped off the board and there is no way for black to stop the pawn from promoting, he will have to give up his bishop for the queen, leaving him in a lost ending.

A very pretty combination, tougher than the typical Tuesday, and one that I wish I had played.

Jan-09-07
Premium Chessgames Member
  dzechiel: <al wazir> is quite correct about the zwischenzug in the first line I gave. By giving the rook check first he is able to capture white's advance b-pawn, giving black a big (perhaps winning) advantage.
Jan-09-07  chopin4525: got it ^________^
Jan-09-07  Autoreparaturwerkbau: Oh no, i'm only tenth! :( ... Duuuh.
Jan-09-07  euripides: <34 Bc3 Bxc3 35 Rd8+ Kg7 36 b8=Q Rxb8 37 Rxb8> a3 38.Rb5 looks good for White as he can play Rxf5 and later f5, when Black won't be able to defend both the e pawn and the a pawn indefinitely e.g. 38...Kg7 39.Rxf5 Kg6 40 g4 and White continues with Rb5 and f5. But the game continuation (not that I got it) is clearly better.
Jan-09-07
Premium Chessgames Member
  spinal pat: got it too :)
Jan-09-07  consul: <dzechiel: At first I looked at 34 Bc3 Bxc3 35 Rd8+ Kg7 36 b8=Q Rxb8 37 Rxb8, but that barely breaks even, leaving black with a lot of fight left in him.

So, I decided to see if there was something more in the position.>

Good! In perfect agreement with Lasker's prescription: "If you see a good move, look for a better one!".

Jan-09-07  Alterno: Gotcha!
Jan-09-07
Premium Chessgames Member
  offramp: I thought Tarrasch said that one about a good move. In any case Capablanca said somehting like, If you see a move you really want to play and you can't see any reason not to play it, then you should play it.
Jan-09-07  eblunt: <NBZ Bc3!? wins the exchange after Bxc3 35. Rd8+ Kg7 36. b8=Q >

What about 34 Bc3 Rb1+ 35 Kg2 Kg7

Don't think white has a clear winning advantage at all after that.

Jan-09-07
Premium Chessgames Member
  mig55: Rd7 wins too but slower...
Jan-09-07  NBZ: <eblunt: What about 34 Bc3 Rb1+ 35 Kg2 Kg7>

Yeah I missed Kg7, black might well be better at this point, so Bc3!? is actually Bc3? lol.

Jan-09-07  Total Blunder: This one was pretty easy, even for a Tuesday!
Jan-09-07  notyetagm: Very nice tactical promotion by Krogius, winning ♗ for ♙. So far, so good this week.
Jan-09-07  notyetagm: <NBZ: ... The key idea is white gets to play Be5 after black plays Bc7 so the b-pawn promotes. If 35. ... f6 36. Bxb2 Bc7 37. Bxf6 and Be5 next.>

Yes, the key idea to solving this puzzle is that White cannot be stopped from eventually playing ♗e5, gaining control of the b8-promotion square and forcing the promotion of the passed White b7-pawn.

As Reinfeld once wrote, in regards to this ♗e5, b7-b8=♕ idea, <Notice the immediate decisive effect of gaining control of the promotion square>.

Jan-09-07  Fisheremon: <notyetagm: Very nice tactical promotion by Krogius, winning B for P. So far, so good this week.> I would play 33.a3 (instead of 33.b7) with a nice win.
Jan-09-07  Ashram64: yea.. got to love tuesday as it made you feel like a working some grandmaster magic.

White's sequence 34.Rd8+ Bxd8, following 35.Bc3+ Kg8 36. Bxb2 Bc7 37.Be5 promotion can't be stopped.

34. Rd8+ kg7 35. b8=Q Rxb8 36. Rxb8 down a rook

Jan-09-07  Selangor: My intuition got me right here ...just before checking with the solution as explained by Ashram64...
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