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Yaacov Zilberman vs Arthur Kogan
ISR-chT (2000), Ramat Aviv, rd 1, Jan-14
Polish Opening: Baltic Defense (A00)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
May-04-21  Cheapo by the Dozen: What the others said.

Except first I confirmed that I wasn't going to find a mate (no realistic way to cover f7, among other challenges) before I turned my attention to material gain.

May-04-21  Cheapo by the Dozen: Actually, White wins a bit more than the exchange, as Rxb4 can eliminate Black's defender of d6.
May-04-21  hdcc: Look ma, no sac !
May-04-21
Premium Chessgames Member
  opus: 39. Nf5 gxf4 40. Ng7+ Kf7 41. h6 Rd6 42. e5 fxe5 43. gxf4 Rg6+ 44. Kf3 Rxh6 45. fxe5 Rh3+ 46. Kg2 Be1 47. Rf4+ Nf5 48. e6+ Ke7 49. Rxf5 Bxf2 50. Rf7+ Kd8 51. e7+ Kc8 52. e8=Q#
May-04-21  mel gibson: Stockfish 13 agrees with the text:

39. Bc7

(39. Bc7 (♗f4-c7 ♖b6-d6 ♖c4xb4 ♖d6-e6 ♘d4xe6 a5xb4 ♘e6-d4 ♘e7-c8 ♔g2-f3 ♘c8-a7 ♗c7-a5 b4-b3 ♗a5-c3 ♔e8-f7 ♔f3-e3 ♘a7-c8 ♘d4xb3 ♘c8-d6 ♘b3-d4 ♘d6-c4+ ♔e3-e2 ♔f7-e8 ♗c3-b4 ♔e8-d7 ♘d4-f5 ♔d7-e6 ♔e2-d3 ♘c4-e5+ ♔d3-e3 ♘e5-g4+ ♔e3-e2 ♘g4-e5 ♘f5-d6 b7-b6 f2-f4 g5xf4 g3xf4 ♘e5-d7 ♘d6-f5 ♔e6-f7 ♔e2-e3 ♘d7-f8 ♗b4xf8 ♔f7xf8 ♔e3-d4 ♔f8-e8 ♔d4-d5 ♔e8-d7 ♘f5-d4 ♔d7-c8) +8.50/39 384)

score for White +8.50 depth 39

However I chose the wrong move
but Stockfish still sees it as good.

39.h5xg6 ep

(39. h5xg6 ep hxg6 (h7xg6 ♗f4-c7 ♖b6xb5 ♘d4xb5 ♘e7-c6 f2-f4 ♔e8-d7 ♖c4-c1 ♔d7-e6 ♔g2-f3 ♔e6-f7 ♖c1-a1 ♗b4-d2 ♖a1-d1 ♗d2-b4 ♗c7-b6 ♗b4-e7 ♖d1-h1 ♔f7-e6 ♖h1-a1 ♗e7-b4 ♖a1-c1 ♗b4-f8 ♖c1-d1 f6-f5 ♘b5-c7+ ♔e6-f6 e4-e5+ ♘c6xe5+ f4xe5+ ♔f6xe5 ♗b6xa5 ♔e5-f6 ♗a5-c3+ ♔f6-f7 ♖d1-d7+ ♔f7-g8 ♘c7-e6 ♗f8-h6 ♘e6-f4 g6-g5 ♘f4-d5 g5-g4+ ♔f3-e2) -6.44/34 118)

score for Black -6.44 depth 34

May-04-21
Premium Chessgames Member
  agb2002: Black threatens gxf4.

The black rook lacks mobility. Therefore, 39.Bc7:

A) 39... Rd6 40.Rxb4 wins a piece.

B) 39... Nc8 40.Bxb6 Nxb6 41.Rc7 wins decisive material.

May-04-21
Premium Chessgames Member
  Messiah: Terrible!
May-04-21
Premium Chessgames Member
  opus: Material is even; White=16, Black=16

Knight defend Rook, activate King, exchange, exchange, endgame

39. Bc7 Nd5 40. Bxb6 Nxb6 41. Rc2 a4 42. f4 g4 43. f5 Bd6 44. Ne6 a3 45. Ng7+ Ke7 46. Ne6 Be5 47. Nc5 h6 48. Nxb7 Bd4 49. Rc6 a2 50. Rc1 a1=Q 51. Rxa1 Bxa1 52. Nc5 Nd7 53. Nxd7 Kxd7 54. b6 Be5 55. b7 Kc6 56. Kf2 Kc5 57. Ke3 Kc4 58. Kd2 Kd4 59. Ke2 Kxe4 60. Kd2 Kf3 61. Kd3 Kxg3 62. Ke4 Kh4 63. Kd5 g3 64. Kc6 Bb8 65. Kb6 g2 66. Kc6 g1=Q 67. Kd5 Qe3 68. Kc4 Kxh5 69. Kb5 Qd4 70. Ka5 Qd7 71. Ka6 Qc6+ 72. Ka5 Qxb7 73. Ka4 Bd6 74. Ka5 Qb3 75. Ka6 Qb4 76. Ka7 Qb5 77. Ka8 Qb8# 0-1

May-04-21  Dr. Funkenstein: yeah this was an odd one....Bc7 jumps out after you realize the rook has no retreat squares but I couldn't see any reason why that one mover didn't work...since it was a puzzle I spent some time looking at Rxb4 first then Bc7, but came to the conclusion that the bishop isn't defending anything in the position and that Bc7 wins material right away
May-04-21  Brenin: Yesterday's POTD was easy for a Monday; this one is even easier. Has this daily challenge morphed into Blunder OTD?
May-04-21
Premium Chessgames Member
  opus: Resign, resign, resign: time trouble?

Teddy KGB: “So, that's it then, hmm? Just like a young man coming in for a quickie. I feel so unsatisfied.” –Rounders

May-04-21  stacase: If it hadn't been for yesterday's puzzle, it would have been a long while before I checked out the fact that Black's Rook had no where to go.
May-04-21  TheaN: I didn't respond yesterday due to the easiness (will still do) but today is even worse. <39.Bc7 +->? This and yesterday are Puzzle Rush/Storm early puzzles; useful, but not really PotD material (not by CG standards anyway).
May-04-21
Premium Chessgames Member
  malt: Me see's the Black rook has nowhere to go, after 39.Bc7

39...Nc8 40.B:b6 N:b6 41.Rc7 Nd7 42.R:b7

May-04-21  AlicesKnight: A Monday-style one-mover; Bc7 and the R has nowhere to run; exchange goes and the game with it.
May-04-21  zb2cr: Black's Rook on b6 has no escape and is won by the simple 39. Bc7.
May-04-21
Premium Chessgames Member
  chrisowen: Limelight keys i Bc7 gifted its a regular keys oats hog i key limelight thigh keys blink quips its wok again way ray keys idiom ride it cuz cuffs jaffa its aims keys eeyore key pang cuz liked it ok public with keys oats Bd6 ego duffles coat drawish keys i gifted its a duck neck pg5 fluffs keys abled it accomodate keys i mourn gaff totups fog jog huffle ditch keys i bump it was poetic Bc7 lad!
May-04-21
Premium Chessgames Member
  thegoodanarchist: not really a puzzle.
May-04-21  1g1yy: Even after losing the exchange, white still has the isolated B pawn with Black's A and B connected. Still two minor pieces to work with, and white just got done declining to take en-pessant, so your G and H pawns yet survive. Not sure I'd resign this one just yet.
May-04-21
Premium Chessgames Member
  drollere: i've started using the puzzles not to look for a solution, but to examine how i look for a solution.

agb2002 has been teaching, for many years, the simple approach:

1. count up the material on both sides. this shapes, but doesn't determine, the "risk portfolio" of what you can give away as a sacrifice or gambit.

2. identify all the opponent threats. i find this useful, because if forces me to look at every piece in every place, and what it is capable of. (looking at you, knights.)

3. identify all offensive opportunities, including counterthreats, discovered checks, etc.

in this puzzle, the threat led to the solution Bc7. but i think the real puzzle is what comes next. what is black's best reply?

the only move i could find was Nc8 to recapture the B and hope to shepherd the a pawn to promotion.

May-04-21
Premium Chessgames Member
  chrisowen: That's it I think no?
May-04-21  TheaN: <1g1yy: Even after losing the exchange, white still has the isolated B pawn with Black's A and B connected.>

In that case, I'd agree. However, how were you intending to achieve a and b whilst only losing the exchange, rather than the rook outright?

Only d6 is defended by the bishop, and the knight can defend the rook with Nc8.

After 39....Nc8 40.Bxb6 Nxb6 41.Rc7 +-, Black's losing Pb7. However, 39....Rd6 is worse <if> you spot 40.Rxb4! +-, after which Black's suddenly losing a piece. That ending is straightforward. However, even 40.Bxd6 Bxd6 41.Ne6 +- is strong enough.

May-04-21  ndg2: Black time trouble? Game seemed to be balanced for a rather long time.
May-04-21  devere: Seems like a "Monday morning" problem.
May-05-21  Nullifidian: Getting caught up on one I missed: 39. ♗c7 and the rook is trapped.
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