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Later Kibitzing> |
| 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. |
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| 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. |
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| 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? |
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| 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. |
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| Dec-14-19 | | Ceri Evans: Did Black miss a draw:
33. Rf1 Re8+
34. Kg7 Rxg2
click for larger viewNow White cannot attack the e7 R with a Knight,
Cheers,
Ceri |
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| 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 |
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| Dec-14-19 | | Vermit: That was my question, Ceri |
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| Dec-14-19 | | Pyrandus: who is nick chrisowen? |
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Dec-14-19
 | | chrisowen: <Pyrandus> kosher. |
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Dec-14-19
 | | 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. |
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Dec-14-19
 | | 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. |
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| 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! |
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| Dec-14-19 | | Nosnibor: Did Black miss 45---e2? |
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| 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. |
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| Dec-14-19 | | 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. |
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Dec-14-19
 | | 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 |
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| Dec-14-19 | | agb2002: After 34.Rf8+ Nd8 35.Nd5 Re5 36.Na4 is winning.
Very nice coordination of the white pieces. |
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Dec-14-19
 | | 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) |
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Dec-14-19
 | | 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. |
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| Dec-14-19 | | RandomVisitor: After 28.Kf8 black apparently has a drawing line
click for larger viewStockfish_19121008_x64_modern:
<53/22 03:46 0.00 28. ... Reg7> 29.Ne6 Rg8+ 30.Kf7 Ne5+ 31.Ke7 Nc6+ |
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| 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. |
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| 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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| Dec-15-19 | | RandomVisitor: After 31...Bf2 note that 32.Kg8 Rg6+ 33.Kh8 Rf6 results in the same position, allowing us to select 34.Rxf2...
click for larger viewStockfish_19121008_x64_modern:
<45/84 24:20 +1.02 32.Rxf2 Rxf2 33.Rf1 Re8+ 34.Kxh7 Rxg2> 35.N5xe4 Kb8 36.Nxg5 Ne5 37.Rf4 Rxc2 38.Nge4 Rh2 39.Nf2 Nxc4 40.Nce4 Nxe3 41.g5 Nd5 42.Rf5 Re7+ 43.Kh6 Re6+ 44.Kg7 Re7+ 45.Kf8 Ne3 46.Rf3 Nd5 47.a3 Rg2 48.Nf6 Rxg5 49.Nxd5 Rh7 50.Nf6 Rh4 51.N2g4 Ka7 52.Kf7 Rh8 53.Rc3 b6 54.Rf3 a5 55.Nf2 Rg1 56.N2e4 b5 57.Rb3 b4 58.axb4 axb4 59.Nd5 Rh1 60.Rxb4 Rh7+ 61.Kg8 R7xh3 62.Ne7 Rh6 63.Nc8+ Ka6 <45/82 24:20 +0.72 32.Kg8 Rg6+ 33.Kh8 Rf6 34.Rxf2> Rxf2 35.Rf1 Re8+ 36.Kxh7 Rxg2 37.N5xe4 Kb8 38.Nxg5 Ne5 39.Rf4 Rxc2 40.Nge4 Rh2 41.Nf2 Nxc4 42.Nce4 Nxe3 43.g5 Nd5 44.Rf5 Re7+ 45.Kh6 Re6+ 46.Kg7 Re7+ 47.Kf8 Ne3 48.Rf3 Nd5 49.g6 Rg2 50.Nf6 Re3 51.Rxe3 Rxf2 52.Re8+ Ka7 53.Kg7 Nxf6 54.Re7 Rf3 55.h4 Rf4 56.Rf7 Nh5+ 57.Kh6 Rxh4 58.Kg5 Rh2 59.Rh7 Rg2+ 60.Kxh5 Rxa2 61.Re7 Rh2+ 62.Kg5 a5 63.Re4 Rg2+ 64.Kf6 Rf2+ 65.Kg7 Rg2 66.Re5 Ka6 45/51 24:20 0.00 32.Ne6 Re8+ 33.Kg7 Rg6+ 34.Kxh7 Rgxe6 35.Nd5 Bxe3 36.Rf6 Bd2 37.Rxe6 Rxe6 38.h4 e3 39.hxg5 e2 40.g6 Ne5 41.g7 Rh6+ 42.Kg8 Kd8 43.g5 Rh5 44.Kf8 Nd7+ 45.Kf7 Ne5+ 46.Kf8 |
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| Dec-15-19 | | RandomVisitor: After 8...Be7 things are kind of even...
click for larger viewStockfish_19121008_x64_modern:
<58/85 6:02:12 0.00 9.f4 exf4 10.Bxf4> Nc6 11.Qe2 Ne5 12.0-0-0 Nfd7 13.Kb1 Rc8 14.Qe3 0-0 15.g4 h6 16.a3 Bc4 17.h4 Bxf1 18.Rhxf1 Nc4 19.Qh3 Bf6 20.g5 Bxc3 21.bxc3 Nc5 22.gxh6 Nxa3+ 23.Ka2 Nb5 24.Bxd6 Nxd6 25.Qg3 g6 26.Rxd6 Qe8 27.Nxc5 Rxc5 28.Qd3 Ra5+ 29.Kb2 Qb5+ 30.Qxb5 Rxb5+ 31.Ka3 Rc5 32.Rd7 Rxc3+ 33.Kb2 Re3 34.Rf4 b6 35.Rd6 Kh7 36.Rxb6 Kxh6 37.Rxa6 Rc8 38.Rxf7 Re2 39.e5 Rexc2+ 40.Kb1 Rc1+ 41.Ka2 R1c2+ |
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| Dec-15-19 | | patzer2: <PawnSac> Thanks for pointing out 32. Kg8 ± (+0.75 @ 37 ply, Stockfish 10) as an alternative to 32. Rxf2 ± (+0.84 @ 37 ply) for avoiding mate-in-one. By the way, 31. Kg8 ± (+0.65 @ 37 ply) is also an alternative to 31. Rf1 ± (+0.91 @ 37 ply) for avoiding mate-in-one. P.S.: My eight-year-old Grandson is currently studying Susan Polgar's Book Three "Mastering Defensive Techniques" in her series for children entitled "Learn Chess the Right Way." That book has a series of tactical problems for avoiding mate-in-one. Maybe I need to go through it again. |
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Later Kibitzing> |
Kibitzing
sac: 32.Rxf2