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



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

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Kibitzer's Corner
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Jan-09-07  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.
Oct-12-21  Brenin: After 34 Rd8+ Bxd8 (or Kg7 35 b8=Q Rxb8 36 Rxb8) 35 Bc3+ Kg8 36 Bxb2 Bc7 37 Be5 Black cannot prevent the b-pawn from queening.
Premium Chessgames Member
  drollere: i don't recall a puzzle like this were there are several ways to win:

A. 34. Rd8+ Bxd8, 35. Bc3+ Kg8, 36. Bxb2 Kf8, 37. Be5

B. 34. Bc3 Rxb7, 35. Bxf6+ Kg8, 36. Rd8#

C. 34. Bc3 Bxc3, 35. Rd8+ Kg7, 36. b8=Q Rxb8, 37. Rxb8

Premium Chessgames Member
  raymondhow: 34.Bc3 appears to fail to...♖b1+. (Engine found that, can't claim credit.)
Oct-12-21  mel gibson: Today and yesterday -
too simple to bother checking with Stockfish.
Premium Chessgames Member
  al wazir: My move, 34. Bc3, also works: 34...Bxc3 35. Rd8+ Kg7 36. b8=Q Rxb8 37. Rxb8 e3 38. Kf1 Kf6 39. Ke2 Bd2 40. Ra8.

It just takes a little longer.

Oct-12-21  nalinw: <al wazir> 34. Bc3 doesnt work - see above
Premium Chessgames Member
  drollere: <34. Bc3 doesnt work - see above>

34. Bc3 Rb1+, 35. Kf2 ... now what?

Premium Chessgames Member
  agb2002: Black threatens Rxb7.

The alignment of Black's king and rook on the a1-h8 diagonal and White's b-pawn suggest 34.Rd8+:

A) 34... Bxd8 35.Bc3+

A.1) 35... Kg8 36.Bxb2 Bc7 37.Be5 wins.

A.2) 35... f6 36.Bxb2 Bc7 37.Bxf6+ Kg8 38.Be5 wins.

B) 34... Kg7 35.b8=Q wins.

Oct-12-21  nalinw: <drollere> - 34. Bc3 Rb1+, 35. Kf2 ... now what?

35 ... Kg7 - protecting the Bishop and getting out of the tempo-winning check ...

Oct-12-21  TheBish: White to play (34.?) "Easy"

Black's bishop is overworked, guarding both d8 and the long diagonal. This leads to the candidate move Rd8+, a deflection sacrifice (although temporary).

34. Rd8+! Bxd8

Or 34...Kg7 25. b8=Q wins a rook for a pawn.

35. Bc3+ Kg8 (35...f6 just gives away another pawn after 36. Bxb2 Bc7 [36...Bb6+ 37. Kf1 Ba7 38. Bxf6+ Kg8 39. Be5 is similar] 37. Bxf6+ Kg8 38. Be5) 36. Bxb2 Bc7 37. Be5 and wins.

Oct-12-21  saturn2: The Rd2 threatens white's two imporatant pawns.. So trade it off.
Oct-12-21  TheaN: I instantly saw the potential of <34.Rd8+>, actually missing <34....Bxd8>, which would be a bit awkward as 34....Kg7 35.b8Q is a basic manouver.

From here, <35.Bc3+ Kg8 36.Bxb2 Bc7 37.Be5> kind of plays itself, where White will force promotion, but 'only' at the cost of the bishop after <37....Bb6+ 38.Kg2 a7 39.b8Q+ Bxb8 40.Bxb8 +-> and White makes time control a piece up.

Mind that <34.Bc3?<>> fails because Black has a tempo to solve the problems on the a1-h8 diagonal. <34....Rb1+ 35.Kf2 Kg7! =<>> and surprisingly, White has nothing and has to be wary of the advanced a-pawn.

Oct-12-21  cocker: 34 Rd7 is almost as good (as pointed out in the past).
Premium Chessgames Member
  chrisowen: Yaw its evict yin its Rd8+ gamble awooga ja agiled its quidditch in yaw its evict yin its rockets v toss guv its family bevel bavarian its zany its way v evicts quiet judge its gotcha champed its junkyard its visa muffs achtung v baby diminishy v fo i v huffled it death lush its game its blubb v awooga job aquakong devil afford joffrey a bluff frazzled it ok mc den v mack decides it rude it code muddle ar its add co it 34.Rd8+ dr it dolittle evict a it fags good value it nack leaf fit glimmers may v i not be gold sad efface I was dreaming of so I gave her it brother its b2 via c3 its rebuttal one hook eve bait kevlar its bond jam guv so evict it reminds me Rd8+ diff;
Premium Chessgames Member
  chrisowen: No dr it was blanched it no?
Premium Chessgames Member
  chrisowen: No hog good ate fond no?
Oct-12-21  AlicesKnight: Saw the game continuation; all (sensible) roads lead ultimately to White win, but after ...Bb6+ and ...Ba7 at some stage, White only emerges a bishop up, losing the b-pawn, and must just ensure the passed e-pawn does not become an issue.
Premium Chessgames Member
  chrisowen: Value gaff too a no?
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