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David Navara vs Radoslaw Wojtaszek
"King David" (game of the day Feb-11-2016)
Biel (2015), Biel SUI, rd 4, Jul-23
Sicilian Defense: Najdorf Variation. English Attack (B90)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 5 ·  Later Kibitzing>
Dec-14-19  areknames: Once you recover from the shock of seeing White's king on h8 about to get mated (what the hell is he doing there?) the sequence 32.Rxf2 Rxf2 33.Rf1 Rxg2 34.Rf8+ Kc7 35.Nd5+ is relatively easy to spot but I didn't visualize any further than that. "King David" indeed!
Dec-14-19  jith1207: But for all the king's walk to the end of enemy lines wouldn't have resulted in a win, if the white king didn't walk back to the middle of the board again to win the pawn.
Dec-14-19  jith1207: And had the Black King walked along forward with the e pawn rather than taking a step backward, the battle could have still ended in a draw due to the efforts from the walks of both Kings.
Dec-14-19  Walter Glattke: White has 1 piece and 1 pawn more, black threatens Rf8#, so 31.Rxf2 Rxf2 33.Rf1 this is the essential puzzle, black to play with e.g. 33.-Rxg1 34.Bxg1 Rf7 35.Be2 Nb4. Several continuations possible after 33.Rf1.
Dec-14-19  mel gibson: The first move is obvious -
it's the only move to avoid mate.
The rest of the game is a technical draw.
It just depends on who can play the better end game.
Dec-14-19  stacase:    
Move 32 White had two choices to avoid mate and one was crappy. The next 4 moves sort of played themselves. I parted company and would have moved 37.Nxc6

So does that count?

Dunno, how far out are we supposed to see these things?

Dec-14-19  Walter Glattke: Finding out, that white could avoid mate also with 32.Ne6, no real move for mating found, more unclear the final result than before after 31.Rxf2.
Dec-14-19  Ceri Evans: Did Black miss a draw:

33. Rf1 Re8+
34. Kg7 Rxg2


click for larger view

Now White cannot attack the e7 R with a Knight,

Cheers,

Ceri

Dec-14-19  King.Arthur.Brazil: In my humble opinion, I guess that the victory way could be shortened by 40. ♔xh7 ♖xh3+ 41. ♖h5 ♖xe3 42. g5 ♖g3 43. g6 e3 44. ♖h2 ♖f3 45. e2 ♔d4 46. g7 ♖f7 (see diagram) 47. ♔h8 and black must exchange the ♖ by the almost crowned ♙ immediately. For ex.: 47...♖f2? 48. g8=♕ ♖xe2 49. ♕g4+ lose the remaining ♖ and the game. Then it would followed ♖xg7 48. ♔xg7 a5 49. ♔f6 a4 50. ♔f5 ♔c3 51. ♔e4 ♔b2 52. ♖xe3 ♔xa2 53. c4+ ♔b1 54. ♔d4 a3 55. ♔c3 c5 56. ♔b3 a2 57. ♖e1#. In the case of 48...♔e4 49. ♔f6 ♔f3 50. ♖e1 ♔f2 51. ♖h1 e2 52. c4 e1=♕ 53. ♖xe1 ♔xe1 54. c5 ♔d2 55. ♔e6 ♔c3 56. ♔d6 a5 57. ♔xc6 a4 58. a3 ♔b3 59. ♔b5 ♔xa3 60. c6 ♔b3 61. c7 a3 62. c8=♕ a2 63. ♕c1 end.

Diagram:


click for larger view

Dec-14-19  Vermit: That was my question, Ceri
Dec-14-19  Pyrandus: who is nick chrisowen?
Dec-14-19
Premium Chessgames Member
  chrisowen: <Pyrandus> kosher.
Dec-14-19
Premium Chessgames Member
  Jimfromprovidence: This is the CG computer output.

1) +0.60 (32 ply) 32.Rxf2 Rxf2 33.Rf1 Re8+ 34.Kxh7 Rxg2 35.N3xe4 Re7+ 36.Kg6 b6 37.Nd6+ Kc7

More useful as a game of the day it seems.

Dec-14-19
Premium Chessgames Member
  Honza Cervenka: Awesome game decided by mistakes in final Rook ending. After 39...Rxc2 40.Kxh7 Kd3 black should not lose. Instead of 35.Nd5+ it was more precise to take the Pawn 35.N5xe4.
Dec-14-19  patzer2: When I first looked at today's Saturday (32. ?) puzzle, I thought "What is White's King doing on h8? He must have taken a walk and gotten lost in Black's forest. Worst of all, he's about to get mated."

The only move to avoid mate-in-one is 32. Rxf2, and after 32...Rxf2 the next obvious move to avoid mate-in-one is 33. Rf1.

However, after that simple beginning the problem gets more difficult. Black makes what appears to be a decisive mistake with 33...Rxg2?, allowing 34. Rf8+ Kc7 35. N5xe4! +- (+2.75 @ 33 ply, Stockfish 10).

By the way, 35. N5xe4! +- (+2.75 @ 33 ply) is much stronger than the "obvious" game continuation 35. Nd5+ ⩲ (+0.54 @ 33 ply).

Black's decisive mistake thus appears to be 33...Rxg2?, allowing 34. Rf8+ Kc7 35. N5xe4! +- (+2.75 @ 33 ply, Stockfish 10). Instead, 33...Re8+ 34. Kxh7 Rxg2 35. N5xe4 ± (+0.63 @ 33 ply, Stockfish 10) significantly improves Black's drawing chances.

Earlier, Stockfish 10 indicates 24...Ne7+ = would have been preferable to 24...Re5+ 25. Kf6! ⩲.

But who would have thought the correct plan was to keep the lone, unprotected King from strolling through Black's forest to h8? What an incredible game!

Dec-14-19  Nosnibor: Did Black miss 45---e2?
Dec-14-19  King.Arthur.Brazil: Good move, <Ceri>. Maybe, White would answer a little different: <33.♖f1 ♖e8+!> 34.♔xh7 <♖xg2>. Then 35. ♘3xe4 ♖e5 36. ♖f7 ♖xc2 37. ♘d6+ (if 37...♔d8?? ♘cb7#) ♔b8 38. ♖xb7+ ♔a8 39. ♘d7?! threatening ♘b6#. However, with 39...♖e7+ 40. ♔g6 ♖xd7 41. ♖xd7♖xa2... Black escapes. Therefore, ii is more logical to continue with 38. ♘d7+ ♔c7 39. ♘b5+ axb5 40. ♘xe5+ ♔d6 41. ♘xc6 bxc6 42. cxb5 cxb5 43. ♖f5 although the victory requires technique. Maybe, instead of 35...♖e5 better would be 35...♔c7 36. ♖f7+ ♖e7 37. ♖xe7+ ♘xe7 38. ♘xg5 ♖xc2 39. ♘ce6+ ♔d6 40. c5+ ♔c6 41. a4 ♖c3 42. e4 ♖c5 with equal chances to both.
Dec-14-19
Premium Chessgames Member
  agb2002: White is a knight and a pawn up.

Black threatens Rf8#.

After 32.Kg8 Rg6+ 33.Kh8 (33.Kf8 Rf6+ 34.Kg8 Rg6+, etc.) 33... Rf6 repeats moves.

The alternative 32.Rxf2 Rxf2 33.Rf1 Rxg2 (33... Rxf1 34.Bxf1 + - [B+N+P vs r]) 34.Rf5 (34.Rf8+ Nd8 35.Nd5 Re5) followed by Nd5, attacking Black's g- and h-pawns, looks interesting.

Dec-14-19
Premium Chessgames Member
  scormus: <nosnibor 45 ... e2?> 46 c4+ (...Kd4 47 Re6) puts paid to that. but it would have been worth trying. 45 Rg5+ doesn't work
Dec-14-19
Premium Chessgames Member
  agb2002: After 34.Rf8+ Nd8 35.Nd5 Re5 36.Na4 is winning. Very nice coordination of the white pieces.
Dec-14-19
Premium Chessgames Member
  Breunor: Nosnibor, you are correct that black had drawing chances with 45 ... e2, as pointed out in the first page here.

Computer analysis:

45...e2 46.c4+ Kxc4 47.Re6 Rh3 48.Rxe2 c5 49.Rc2+ Kd4 ⩲ +1.42 (28 ply)

But people didn't point out that black had an easier draw on the 44th move. White's Kg5 threw away the win:

Black draws with Kc3!

44...Kc3 45.Rxc6+ Kd2 46.Rd6+ Kxc2 47.Re6 Kd2 48.h5 e2 = 0.00 (35 ply)

But white holds the win with:

44.g5 c5 45.Re6 Kc3 46.g6 Kxc2 47.g7 Kd2 48.Re5 e2 ± +1.92 (25 ply)

As others have pointed out, white can win with 35 Nxe4:

35.N5xe4 Nb4 36.a3 Rxe4 37.Rf7+ Kc6 38.Nxe4 Nxc2 39.Rf6+ ± +2.10 (27 ply)

Dec-14-19
Premium Chessgames Member
  PawnSac: < mel gibson: The first move is obvious - it's the only move to avoid mate. >

<patzer2: The only move to avoid mate-in-one is 32. Rxf2, and after 32...Rxf2 the next obvious move to avoid mate-in-one is 33. Rf1. >

well i agree that 33.Rf1 is the obvious continuation, but 32.Kg8 also avoids mate in 1. I will say this.. I too saw Rxf2 FIRST, but i looked further and asked "why not Kg8?" There is no obvious mate, just a bunch of piece shuffling. I didn't take a close look to see if there was a resulting endgame problem. It's only a puzzle and for my personal taste would have played it differently much earlier.

In any event, since white is up a piece at 32. ? white to play, he does have options and with the knights poised for forks, the RxB is a temporary exchange sac. If i had this position in the actual game i would have also played Rxf2 since the resulting positions are more easily calculated (at least to me) being more forcing, and seems to keep an initiative.

Dec-14-19  RandomVisitor: After 28.Kf8 black apparently has a drawing line


click for larger view

Stockfish_19121008_x64_modern:

<53/22 03:46 0.00 28. ... Reg7> 29.Ne6 Rg8+ 30.Kf7 Ne5+ 31.Ke7 Nc6+

Dec-15-19  Cheapo by the Dozen: Up through Move 34, this is all a straightforward way for White to avoid mate. What's not obvious is that White has much of an advantage.
Dec-15-19  mike1: I don't think there is much to this puzzle as White could play 32.Kg8 to avoid any mate. AND nothing is forced after Rxf2 Rxf2 either. Should have been a draw either way. Interesting game though and Navara deserves a medal for trying to win and winning!
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