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



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Kibitzer's Corner
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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...
Jan-09-07  notyetagm: <Ashram64: ... 34. Rd8+ kg7 35. b8=Q Rxb8 36. Rxb8 down a rook>

Yes, 34 ♖d8+! gains control of the loose b8-promotion square with tempo.

Jan-09-07  micartouse: I messed up. I found Bc3 and Rd8+ both fairly quickly but then chose the wrong one.

I missed the final Be5 stroke. :(

Jan-09-07  YouRang: Well, 34. Rd8+ was the first move I looked at. Unfortunately, my first round of looking is rather shallow, so I dismissed it after seeing 34...Bxd8

It was maybe the 2nd or 3rd time that I looked at 34. Rd8 that I noticed the pretty bishop fork that not only wins the rook back, but puts the bishop in position to guard the b8 promotion square. This lets me win a bishop for a pawn with an easy endgame.

Premium Chessgames Member
  kevin86: I was at two minds for this one-and missed the final touch!

34 ♖d8+ ♗xd8 35 ♗c3+ ♔g8 36 ♗xb2 ♗c7 37 ♗e5 forcing the pawn through by clearing the line of the bishop

Jan-09-07  Themofro: I got it without to much trouble. Obviuosly white wants to promote so my first glance was Rd8+ but after i saw bishop takes but it on the backburner and looked for alternatives, but didn't see anything else. So i realized that Rd8+ must be the move, as such find a way to make it work, and lo and behold! there it is, i jut didn't look far enough the first time, even though it wasn't hard, lol, a nice game.
Jan-09-07  TrueBlue: put me in the bc3 crowd. It's a cool move, but you need your calculator to figure out if it works.
Jan-09-07  haha: Nice.
Jan-09-07  simsan: I am happy with this one. I got it all the way to seeing that Be5 would win material.

Initially, however, I had a different idea which I guess was interesting enough to share.

I considered attacking the black bishop with Rd6, since I believed it would either have to leave the long diagonal (enabling Bc3+) or open d8 for Rd8+ (with pawn promotion). My "cunning" mind had a feeling that even after 34. .. Kg7+ I could still play 35. Rxf6??

The idea was:
35. ... Kxf6 36.Bc3+! K[any] 37. Bxb2
or maybe
35. ... Rxd2 36.Rxf7+ KxR 37. b8Q
The problem was the zwischenzug...
35. ... Rb1+! leaving me down the exchange and soon without my advanced pawn (in other words: lost).

So I had to start from scratch and (possibly due to my prior evaluations) I rather quickly saw the correct sequence of moves.

Jan-09-07  alphee: Once 34.b8=♕ is eliminated the solution comes easily BUT back can play 34... ♔g7 35. b8=♕ ♗d4+ 36. ♖xd4 ♖xb8 37. ♗c3 ♔g6 38. ♖xa4 f6 39. ♖a6 ♖f8 40. ♖e6 h5 .... in which case white may still have to "fight" a bit. It does not seems anybody mentioned it ...
Jan-09-07  alphee: <simsan> sorry, I didn't see your posting!
Jan-09-07  unsound: <alphee> Eh? In your line, why does white have to play 36.Rxd4? Just play 36.Kf1, and you stay a rook ahead, and don't have to fight.
Jan-09-07  Fisheremon: <unsound: <alphee> Eh? In your line, why does white have to play 36.Rxd4? Just play 36.Kf1, and you stay a rook ahead, and don't have to fight.> Right, but as I noted before playing 33.a3 White could have a similar thing (=a nicer win).
Jan-09-07  Fisheremon: <simsan><alphee><unsound> Quite interesting that 34.Rd6 (as well as Rd7) wins too: 34...Kg7 35.Rd7 Kf8 36.Rc7 Bd4+ 37.Kf1 Kg7 38.Rd7 Bf6 39.Be3
Premium Chessgames Member
  Cannon Fodder: I totally missed this one by choosing Bc3. The mistake consisted of a) not seeing that black has a check and b) not calculating far enough to see that the f4 pawn will protect the bishop when black attacks the promotion square. Oh well, at least I got yesterday's puzzle.
Jan-09-07  Trouble: nice problem, solved it instantly
Jan-09-07  unsound: <Fisheremon> 33.a3 with the idea 33...Rb2, 34.Bb4, right? Took me a little while to see your point.
Jan-09-07  simsan: <Fishermon> Yes the computer gives both Rd6 and Rd7 pretty good evalutations in addition to Rd8+. But Rd8+ is of course clearly better from all perspectives.

better eval, forced lines, simplification, easily won endgame

After Be5 Bb6+ 38. Kg2 Ba7 39. b8Q/R+ Bxb8 40.Bxb8 the position would call for a resignation even in blitz games at my level of play.

Jan-09-07  greensfield: Went along 34. Rd7 route, so missed the nice 34. Rd8+ with the Bishop fork etc.
Jan-09-07  GannonKnight: One of the easier Tuesday puzzles.
Jan-10-07  Fisheremon: <unsound: <Fisheremon> 33.a3 with the idea 33...Rb2, 34.Bb4, right? Took me a little while to see your point.> 33.a3 is a typically silent move (you could also discover 28...e4 was a positional mistake leading to the lost position). Black has to be forced with 33...Rc6, or Rc8 leading to immediate loss of big material.
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