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Hugo Munoz Sotomayor vs Hernan Salazar Jacob
Novi Sad Olympiad (1990), Novi Sad YUG, rd 3, Nov-19
Sicilian Defense: Scheveningen. Classical Variation General (B83)  ·  0-1



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Kibitzer's Corner
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Premium Chessgames Member
  Once: <zanshin: <The Long Diagonal: Btw, I never found out, how to make positions appear in kibitzing... sorry, I know that would be helpful.>

<TLD> All is explained here: Kibitzing Tricks>

Well, you can follow the advice in the kibitzing tricks page, but there are much easier ways to insert FEN diagrams into your posts.

The easiest way to post a position from a game on is to get to the position you want from the diagram, then right click anywhere in the diagram. This will bring up a sub menu where the first option should be "copy position". Click on this to put the position into the paste buffer.

To insert the position into your post, click on where you want it to go and then press control and V together to paste it in.

If the position is a variant of the main game, then you need to get to the point where the moves diverge by clicking through the main game. Then start playing your new moves directly onto the board. This should overwrite the game score with your moves. When you get to the position you want, again right click to capture the position and control V to paste it.

If you want to insert a diagram that has nothing to do with a game already on than you need a chess program of some kind. I use Fritz 11, which allows you to create any position using "file-new-position setup" or to copy a position from any game using "edit-copy-copy position".

One of these days, really ought to update the kibitzing tricks page. I really hope that no-one is creating FENs by hand!

Premium Chessgames Member
  Eggman: <<benjaminpugh>> 60.Rxa5?? Qe1+ and 61...Qxa5.
Premium Chessgames Member
  fm avari viraf: BLACK has a problem like win with 55...d3 56.cxd3 [ if 56.Kxe4 dxc2 ] 56...Rc4! 57.bxc4 c2 marching for coronation & Her New Majesty will spell disaster in White's feeble kingdom.
Premium Chessgames Member
  FSR: 55...d3!! 56.cxd3 (56.Kxe4 dxc2 ) Rc4!!
Oct-30-09  Marmot PFL: Looked at this this morning and only got to 55...c3 56 cd and thought now white just plays Rc4. Glanced at it 2 hours later and suddenly realized black can play Rc4 first.
Oct-30-09  CHESSTTCAMPS: In this rook and pawn ending, material is even and each side has a passed pawn that is securely blockaded. White appears to have the superior king and rook position (king more centralized, and rook behind enemy passed pawns), but black has pawns that are dangerously advanced. White threatens black's rook, destabilizing black's dangerous d-pawn. However, black can ignore the threat with a pawn promotion combination:

A) 55... d3!

The only candidate I considered - after yesterday's "superpawn" study, the interference theme was easy to find.

56.cxd3 (Kxd4?? dxc2 promotes both c-pawns) Rc4! (the key move, preventing Rc5) 57.dxc4 (bxc4 leaves the a4 pawn a target for the queen to be) c2 58.Kxf4 c1/Q+

Black is obviously in the driver's seat with the new queen against the rook, but white's 3 pawn surplus leaves chances to reach a theoretical draw. Of course, "comprehensive" analysis without engine or database support is impossible, but I'll outline a few continuations that make sense to me.

59.Kg4 Qd1+ 60.Rf3 (to defend the queenside pawns) Qe2 61.Kg3 Kg5! (Kxh5 62.Rf5+ Kg6 63.Rb5!- not Rxa5?? - looks like a draw that I seem to recall from an old Benko column) 62.h6 Qe5+ 63.Kf2 Kxh6 (systematically picking up loose pawns) 64.Kf2 Qb2+ 65.Kg3 Kg5 and it becomes apparent that that the white rook eventually has to abandon the 3rd rank and lose the b-pawn and the other queenside pawns.

A.1) 58.bxc4 c2 59.Kxf4 c1/Q+ 60.Kg4 Qd1+ 61.Kf4 Qxa4 creates a troublesome passed a-pawn

A.1.1) 60.Ke4 Qe1+ 61.Kf4 Qb4 wins white's a-pawn

A.2) 58.Rxa5? Leaving black's f-pawn on the board makes things too easy.

58... c1/Q 59.Kg4 Qe3 60.Ra6+ Kh7 61.Kg5 Qg3+ 62.Kf5 f3 and white can only deliver a few spite checks with the rook before the f-pawn promotes.

A.3) 58.Rxc4 c1/Q 59.Rf5 Qc3+ 60.Kf4 Qxb3 61.Rxa5 Qxc4+ 62 Kf5 (Kf3 Qc3+ picks up the rook) Kxh5 and black gradually reaches the barebones Q versus R ending or picks off the rook with fork at the first opportunity.

A.4) 60.Kf4 Qxb3 is like A.3

A.5) 61.c5 Qc1 62.Rf5 Qc3 63.Rf3 Qxc5 picks up the loose pawn.

In short, I see "best play" ending in the theoretically won Q versus R ending

From the diagrammed position, if black tries 55... Re3+? 56.Kxf4 Re2 57.Rd5 Rxc2 58.Rxd4 Rb2 59.Rc4 white has no losing chances. If 56...d3? 57.cxd3 Rxd3 (f2? 58.Rc5) 58.Rc5 c2 59.Rxc2 Rxb3 should be drawn.

Premium Chessgames Member
  Jimfromprovidence: < Eggman> hatched a plan to gain a draw and the yolk’s on us.

His line is absolutely correct. 57 dxc4 draws. The text 57 bxc4 is no good.

Bravo <Eggman>, we must be the walruses.

Oct-30-09  WhiteRook48: I failled!
Oct-30-09  David2009: Friday's puzzle H Munoz vs J Salazar, 1990 Black 55...?

There is a pawn promotion tactic: 55...d3 56 cxd3 Rc4 57 dxc4 c2 58 Rc6+ (White dare not not capture the f4 Pawn) Kh7! 59 Rc7+ Kh8! 60 Rc8+ Kg7 (Black is finally forced on to the g file but his K is one square nearer the dangerous h pawn) 61 Rxf4 c1=Q 61 Rg4+ Kh6 62 Rg3 White has managed to defend his b3 pawn indirectly from the side and now wants to approach the Queen side Pawns with faint drawing chances if he can hold the b3 Pawn. 62...Kxh5! and Black is ready to cross the all-important fifth rank.

There is an interesting contrast with yesterday's ending. I am grateful to <Chessdreamer> and to <zaxcvd> for independently supplying the missing moves. We reach

click for larger view

R Rodriguez vs Van der Wiel, 1982, 63?. Black has constructed a fortress- the Rook on d5 shuts the White King out. Direct infiltration leads nowhere e.g. 63 Qg7 Ke8 64 Qa8+ Ke7 65 Qg7 Rd8. White nevertheless won by bluff and skill: 63.Qb4+ Ke8 64.Qa3 f6 65.Qa4+ Ke7 66.Qa7+ Rd7 67.Qb8 Rd5 68.Qc7+ Rd7 69.Qc3 Rd5 70.g5 Rf5 71.Qc7+ Kf8 72.Qd8+ Kf7 73.Qd7+ Kf8 74.gxf6 Rxf6 75.Kg5 1-0. 64 ...f6 was the fatal mistake. We know from Fine 'Basic Chess Endings' (1941) that R+P draws against the Q if the Pawn is still unmoved (second rank) because there isn't enough room for the Q to infiltrate behind for the crippling zugzwang.

Returning to today's puzzle, because White is late with his fortress and his rear pawn is on the third rank, my money is on Black.

Time to check how the game went, and digest the (always interesting) comments by other players. ====
White defended poorly IMO. In my line we reach:

click for larger view

H Munoz vs J Salazar, 1990 variation, White 63? Perhaps I was over-pessimistic in my forward analysis: now that I can see the position I quite like White's chances. The next step is to defend this White aginst Crafty and see how I get on.

Time to post and stop.

Oct-30-09  zanshin: <One of these days, really ought to update the kibitzing tricks page. I really hope that no-one is creating FENs by hand!>

<Once> Of course you are right - I did not mean to imply that anyone would have to input the fen by hand. Even without a program like Fritz or Rybka, all you need to do is use the Chess viewer deluxe default, select the desired position (by either clicking on the move list or using the navigation buttons), then right click on the board and select Copy Position. This will also create a fen that you can paste into your post.

Oct-30-09  remolino: 55...d3! is all too obvious in a problem setting, and the continuations are also easy to figure out. Done. Cheers.
Oct-30-09  DarthStapler: Got it
Oct-30-09  CHESSTTCAMPS: IMO 57.dxc4 should be preferred over bxc4 on general principles.

<David2009> We seem to have worked on similar tracks - this is tricky stuff to navigate by just visualizing the position, as we have both attempted.

Oct-30-09  Eduardo Leon: <55. ... d3!>

The pawn threatens to queen.

<56. cxd3 Rc4!!>

The white rook, blocked by two pieces (the f4 pawn and the white king) can't return to the back rank, so the c3 pawn will queen safely.

Oct-30-09  Eduardo Leon: I don't have an engine to confirm my finding, but I think <29. c3> is actually better, hoping to tie black to the defense of his weak d6 pawn after <29. ... Rxd1 30. Rxd1>.
Oct-30-09  Artar1: I found <55...d3!>, and then I knew Black had at least a draw. But I had to move pieces around the board to work out all the various combinations to make sure White did not have a hidden winning or drawing resource.
Oct-30-09  felixd: 57. dxc4 lose even faster... The pawn in b3 becomes so weak that he will lose it...

57... c2 0-1

Oct-30-09  Criswell: Wow. This one was easier than some previously in the week. 55. ...d3! is pretty apparent because white would be forced to recapture the pawn 56. cxd3 and then black just marches his c-file pawn to victory after keeping white's rook off the c-file.
Oct-30-09  jon01: I saw this immediately.
Oct-30-09  AuN1: got it
Oct-30-09  zanshin: <Eduardo Leon: I don't have an engine to confirm my finding, but I think <29. c3> is actually better, hoping to tie black to the defense of his weak d6 pawn after <29. ... Rxd1 30. Rxd1>.>

Fwiw, move 30 (White to move), Rybka 3 considering only <29.Nxd4> and <29.c3>.

click for larger view

[+0.19] d=19 29.Nxd4 cxd4 30.Qd3 Rb8 31.Rac1 Nf6 32.h4 d5 33.exd5 Bxd5 34.hxg5 Nxg4 35.Kg1 Ne3 36.Bxd5 Nxd5 37.g6 fxg6 38.fxg6 Ne3 39.Qe2 Nxd1 40.Rxd1 Qc5 41.Rd2 d3 42.Qf2 Qxf2 43.Kxf2 dxc2 (0:23.45) 76204kN

[-0.14] d=18 29.c3 Rxd1 30.Rxd1 Qc7 31.c4 Rb8 32.Rd3 f6 33.Kg2 Nf8 34.Ng3 Rd8 35.Rd1 Qb8 36.Qc3 Rd7 (0:13.06) 39123kN

Oct-30-09  MindBoggle: This is hardly a friday puzzle.

Black only has one candidate move, the main line is only 4 moves deep, and there aren't any (hard) branches in the calculation.

This belongs on a wednesday, in my opinion.

d3 is obvious, and there's no need to decide whether the resulting Q vs R ending is winning or not. At the very least black must have good winning chances, which is more than can be said about any alternative to d3.

So d3 is obviously black's best try, and that is all we need to know. Just play it, and worry about how to win the Q vs R ending when we get there.

Oct-30-09  eaglewing: >YouRang>: Yes, start checking may run
into a king disturbing the rook. Nevertheless, a check and return to the save spot b5 with the rook may sometimes work against a Zugzwang.

The more important point: You ignored (57. dc) 61 Rb5 Qc3+ 62.Ke4 Kf6 63. Kd5 and going for the a8 corner. The tablebase (the pawns a4+a5 ignored) lists after 62.Ke4 Kf6 a draw with Kd5 or Rb6 (the latter one seems to have the smaller margin of a draw). In fact, the tablebase lists only 61. Rb5 Qe1 as winning for Black, Qc3 draws. A change of this result due to the missing pawns on the a-file seems not to exist. The same result is listed for the black king on h4 instead of g6.

63. Kf4 is a clear error, you should not base your analysis on it, pushing the king to f4 and the h-line must be earned and cannot be forced with Qc3.

Last point: The Tablebase without pawns on the a-file lists, ofcourse, the defense position with Kf3/Rg3 and an already killed Ph5 (just Pb3+Pc4 remain) as lost.

Oct-31-09  YouRang: <eaglewing> Perhaps you're right. In any case, there can be no doubt that <Eggman> found the best defense and with best play, white might well preserve the draw.
Oct-31-09  YouRang: Final comment here: Sliding along with the computer vs. <Eggman>'s defense, I found this win for black:

55...d3 56. cxd3 Rc4 57. dxc4 c2 58. Rf6 <Kh7> 59.Rxf4 c1=Q 60. Rd4 Qb1 61. c5 Qxb3 62. Ke4 Qb7 63. Ke5 Qc7 64. Kd5 Kh6 65. c6 Kxh5 66. Rc4 Kg5 67. Kc5 Kf5 68. Kb5 Ke5 69. Rc2 Ke4 70. Rd2 Qf7 71. Kxa5 Qc4 72. Rb2 Qc3 73. Rb4 Kd5 74. c7 Qxc7 -- tablebase: black mates in 13

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