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Sebastian Donoso Diaz vs Gonzalo Ivan Recabarren Gajardo
2nd Zicosur Open (2016), Antofagasta CHI, rd 9, Jan-10
Formation: Queen Pawn Game: London System (D02)  ·  1/2-1/2

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Sep-29-17  patzer2: With (49. ?) being a fairly difficult Friday puzzle, it was not hard for me to figure sacking the pawn with 49. Ke6 +- was the answer.

However, over the board and without chessgames.com whispering in my ear that there's a win in the position, I likely would have done the same as White in this game.

Sep-29-17  Altairvega: The counter intuitive Re6 , instead of Rc2 wins the game for white. The white king must come closer. 49. Ke6. Kg2 50. Kf5 g3 51 Kf4 h4 52. Rc2+ Kh3 53.Kf3 followed by 54. Rg2
Sep-29-17  BxChess: <Altairvega>: I believe that your line is a stalemate. I think you need 53. Rc3 to force the win.
Sep-29-17
Premium Chessgames Member
  al wazir: Got it.

There were really only two plausible moves, with few branch points in either line. So once I saw that 49. Rc2 didn't work, the other one had to be right. And sure enough, black's ♙s turn out to be more of an obstacle to his ♔ than white's g-♙ was.

Sep-29-17  mel gibson: White makes a wrong move and it leads to a draw.

The computer picks the correct move:

(49. Ke6 (♔d7-e6 ♔g3xg2 ♔e6-f5 g4-g3 ♔f5-f4 h5-h4 ♔f4-g4 ♔g2-f2 ♖c7-c2+ ♔f2-e3 ♔g4xh4 ♔e3-f4 ♖c2-g2 ♔f4-f3 ♖g2xg3+ ♔f3-e4 ♔h4-g5 ♔e4-d5 ♔g5-f6 ♔d5-e4 ♖g3-g4+ ♔e4-d5 ♔f6-f5 ♔d5-d6 ♔f5-e4 ♔d6-c5 ♔e4-e5 ♔c5-c6 ♔e5-d4 ♔c6-d7 ♔d4-d5) +M24/28 95)

score for white Mate in 24

Sep-29-17  NBZ: <An Englishman>: Nice! I did not see that at all. Here are some variations after 51. Kf4, it's actually fairly tricky for White even at this point because of all the stalemate traps Black can set:

[A] 51. ... h4 and White has to avoid the natural 52. Rc2+? Kh3 (Kg1 Kf3 zugzwang) 53. Kf3 g2 and now 54. Rxg2 is stalemate! Cute right? Even if White now tries 54. Kf2 Kh2 55. Rc1 h3 and again stalemate is unavoidable.

The correct move after 51. ... h4 is 52. Kg4! winning easily.

[B] 51. ... Kh3 and again White's gotta be careful, since there are stalemate/knight underpromotions lurking in every corner.

[B1] 52. Rh7? and now

[B11] 52. ... h4 53. Kf3 g2 54. Kf2 wins, but...

[B12] 52. ... Kg2! 53. Rxh5 Kf2 54. Ra5 g2 55. Ra2+ Kf1 56. Kf3 g1=N+! is a book draw: the knight cannot be trapped.

[B2] 52. Rg7! h4 53. Kf3 g2 54. Rg4! (not falling for Rxg2 stalemate) and now:

[B21] ... g1=Q+ 55. Rxg1 Kh2 56. Ra1 h3 57. Ra2+ Kg1 58. Kg3 wins.

[B22] ... Kh2! requires some nifty play from White 55. Rxh4+ Kg1 56. Kg3! (Rg4 Kh1! setting yet another stalemate trap) Kf1 57. Rf4+ Kg1 58. Ra4! (not Rf2? Kh1! forcing stalemate) Kh1 59. Rh4+! Kg1 60. Rh2 finally winning the pawn.

[C] 51. ... Kh2 52. Rh7! g2 53. Rxh5+ Kg1 54. Kg3 Kf1 55. Rf1+ wins similar to [B22].

Phew! Rook vs. pawn endings are tough.

Sep-29-17
Premium Chessgames Member
  al wazir: 19. Nc5 would have given white a good game: 19...Nxc5 (19...axb5 20. Bxb5 Bf5 21. Ra7) 20. dxc5 0-0. 21. bxa6 bxa6 22. b4. After white takes the black a-♙ his own Q-side ♙s look unstoppable.
Sep-29-17  NBZ: Ah and as it turns out, my analysis of 52. Rh7 was wrong, White can still win though I struggle to see how I would find it over the board: 52. Rh7 Kg2 53. Ke3! Kf1 54. Ra7! (Rxh5 again draws) Kg2 55. Ra2+ Kh3 56. Kf3 h4 57. Ra4!! wins.
Sep-29-17  Walter Glattke: 49.-h4 50.Kf5 h3 51.gxh3 gxh3 52.Rg7+ Kf2 looks draw
Sep-29-17  NBZ: <Walter Glattke> 49.... h4 50.Kf5 h3 51.gxh3 gxh3 52. Rc3+ Kg2 53. Kg4 h2 54. Rc2+ Kg1 55. Kg3 h1=N+ 56. Kf3 should win.
Sep-29-17  AlicesKnight: My instinct (to get the K closer) proved to be correct.
Sep-29-17
Premium Chessgames Member
  Cheapo by the Dozen: Quite easy and quite difficult at once.

Rc2 is a clear drawing move. It offers no real chance to win, and even less chance of losing.

So is the draw still in hand after Ke5/Kf5? Well, yes. Black can't guard both his pawns and also avert perpetual check, so White is pretty assured of picking off one pawn with his king while preventing the other from queening with his rook. Thus, there's little risk to trying the Ke6/Kf5 plan.

On the other hand, calculating it out to a precise win seems very difficult. I didn't even try, and I wouldn't have tried over the board either.

Sep-29-17  morfishine: <49.Rc2>
Sep-29-17  gofer: Okay, I think that moving the rook is drawing at best, but moving the king to either d6 or e6 may be winning. But of the two, I think that e6 is definitely the better and easier choice to make, so analysing d6 doesn't make much sense...

<49 Ke6 ...>

Black has two choices;

a) bring the pawns up before taking the pawn.
b) take the pawn and hope that his pawns can catch up

49 ... h4
50 Kf5 h3
51 Rc3+! Kxg2
52 Kxg4 h2
53 Rc2+ Kg1
54 Kg3! h1=N+ (h1=Q/B/R Rc1#)
55 Kf3 +-


click for larger view

<49 ... Kxg2>
<50 Kf5 g3>
<51 Kf4 h4>
<52 Kg4 Kh2>


click for larger view

So then what?!

~~~

Ahhh... <53 Rh7! ...> this was the bit I missed...

Sep-29-17  bane77: I didn't calculate much, but it is clear that Ke6 has to be the right move. Any move with rook like Rc2, Rc3, Rc4 or such is a waste of time. King has to approach closer to pawns, either in front of them to first rank (which is impossible here) or to attack them. So Ke6 - Kxg2; Kf5 - g3 (h4); Kf4 h4 (g3) and now Rc2+. King is close to black pawns and with rook checks this has to lead to win one way or another.
Sep-29-17  claudi: 49.Ke6 is the winning move while Rc2 can only lead to a draw.
Sep-29-17
Premium Chessgames Member
  catlover: This is a very instructive puzzle.
Sep-29-17
Premium Chessgames Member
  Cheapo by the Dozen: Of course, I meant Ke6/Kf5 above -- i.e., the game line.
Sep-29-17  newjerm: If you have been studying endgame, you do not need to calculate much. You can easily assessed the position. This one is difficult to those who did not improve their chess playing strength by studying/analyzing endgames.
Sep-29-17  newjerm: Analyze emdgame by not moving the pieces to improve your game.
Sep-29-17  Marmot PFL: Thought to play either Rc2 or Ke6. easy though to see with a bit of thought that Rc2 is a straightforward draw. Ke6-f5 is the only try and the win still looks difficult. One position to remember is WK g3, BK g1, WR c2, bp h2...black has to play h1(N)+ but Kf3 still wins.
Sep-29-17
Premium Chessgames Member
  Jimfromprovidence: After 49 Ke6 Kxg2 50 Kf5 (or Ke5) g3 here is the position.


click for larger view

White now needs three consecutive one only win moves with best play by black, per the Nalimov tablebase.

<gofer> has posted the line.

The point is, even though 49 Ke6 is correct, it's still quite possible to get it wrong.

Here is the link to the table base. You can plug in the position and any variations to see what works.

http://www.k4it.de/index.php?topic=...

Sep-29-17
Premium Chessgames Member
  Fusilli: Very nice puzzle.
Sep-29-17  barryh1976: This was super easy for a draw. Not a 3 star difficulty at all.
Oct-01-17
Premium Chessgames Member
  Fusilli: <Barryh> The puzzle was about finding the winning move/sequence, not the move white made. See the comment on the game score and all the posts.
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