|
< Earlier Kibitzing · PAGE 2 OF 2 ·
Later Kibitzing> |
| Sep-07-16 | | Cheapo by the Dozen: What happens if Black tries ... Ra1/Rf1?
I didn't see how White wins in that case, so I went with the slower/surer alternative of 54 Kf2. My notes were:
-------
If White tries 53 Rxc7, the rook is obviously poisoned. Black's reaction has to be an attempt to get his rook to the f-file, with quasi-perpetual check if White doesn't permit that. However, if he tries that, his king winds up in a mating net. So my main line is 53 Rxc7 Ra3+
54 Kf2 Ra2+
55 Ke3 Ra3+
56 Kd4
Black has nothing better than 56 ... Kxc7 after all, due to the threat of Rc7#. The main chance for Black to deviate is with ... Ke5 on Move 53 or 54. That could give us: 53 Rxc7 Ke5
54 f7 Ra3+
55 Kh4 Rf2
56 Kg5
and Black is helpless against a White king march to e8 via f8, after which he'll be able to queen the pawn. It's possible that 54 Kf4 wins a lot more quickly, but I don't see how, so I'd play the safer/slower line above instead. |
|
| Sep-07-16 | | saturn2: B(i)lack has to give up after Rxc7. |
|
| Sep-07-16 | | agb2002: Both sides have one rook and three pawns.
Black threatens Rxc4.
The white rook blocks the advanced pawn. This and Black's threat suggest 53.Rxc7: A) 53... Kxc7 54.f7
A.1) 54... Ra3+ 55.Kg4 Ra1 56.f8=Q Rg1+ 57.Kh3 Rh1+ 58.Kg2 wins. A.2) 54... Rxc4 55.f8=Q
A.2.a) 55... Rd4 56.Qg7+ wins.
A.2.b) 55... Rc5 56.Qe7+ Kb8 57.d6 wins.
B) 53... Ra1 54.Rc6+ and 55.Rxb6 + - [2P].
C) 53... Ke5 54.f7 Ra3+ 55.Kg4 wins.
D) 53... Ra3+ 54.Kg4 transposes to previous lines. |
|
| Sep-07-16 | | et1: well this looked like a Monday..did it instantly ! |
|
| Sep-07-16 | | AlicesKnight: It's a CG puzzle so there might be a sacrifice involved - but there is only one realistic one; 53.Rxc7, clearing the f-pawn while preventing the Black K's approach. If 53.... Kxc7, 54.f7 and now ...Ra3+ is met by 55.Kg4 (not Kh4, nor Kf4, met by ...Ra1) followed by queening. What happened? - different order but same result; Black cannot set up a fortress with R and connected Ps because of the extra White P. <Cheapo>'s points about play after 53....Ra1 are good. |
|
| Sep-07-16 | | Steve.Patzer: I thought the continuation would be 53. Rxc7 resigns. 1-0 |
|
| Sep-07-16 | | patzer2: Fairly easy Wednesday endgame puzzle for me following the game continuation as a guess-the-move exercise from 53. Rxc7 until Black resigned after 57. Kf5  .In the final position, Deep Fritz 15 gives mate-in-13 after
57...Kb7 58.d6 Rc2 59.Qe7+ Ka6 60.Qe3 Rc8 61.d7 Rf8+ 62.Ke6 a4 63.Ke7 Rg8 64.Qd3+ Ka5 65.Qd5+ Kb4 66.Qxg8[] Kc3 67.d8Q b5 68.Qa2 Kb4 69.Qad2+ Kb3 70.Q8d3#. For a Black improvement I'd start with the popular, standard reply 5...0-0, which stays flexible and avoids 5...e5 6. dxe5 dxe5 7. Qxd8+  (0.46 @ 28 depth, Komodo 10). A few moves later I prefer 7...a5 = (0.22 @ 30 depth, Komodo 9.3) as in B Malich vs K S Ojanen, 1959. In the endgame, Black could have improved his drawing chances with 49...Ra1 when Deep Fritz 15 gives the continuation 49... Ra1 50. Rg7+ Kd6 51. f6 Rf1 52. f7 c5 53. Rh7 Ke7 54. Rh6 Kxf7 55. Rxb6
Rc1 56. Kf4 Rxc4+ 57. Ke5 Rg4 58. Rb7+ Ke8 59. Kd6 Rg6+ 60. Kxc5 Rg4 61. Ra7 Rxa4 62. Kd6 Rd4 63. Rxa5 to (+2.05 @ 44 depth) in the diagram below: 
click for larger viewThough Fritz gives this position as a win, the endgame tablebase at http://www.shredderchess.com/online... indicates it's a draw after 63...Rd3, 63...Rd2 or 63...Rd1. |
|
| Sep-07-16 | | patzer2: After calculating for some time after 44 depth, Deep Fritz 15 finally found the draw with the strange assessment (0.00 @ 0 depth) for the Rook endgame position in my previous post. |
|
| Sep-07-16 | | morfishine: Saw this one instantly |
|
| Sep-07-16 | | thegoodanarchist: Monday was harder than this! |
|
| Sep-07-16 | | PJs Studio: But in a game most of you would play 53.Re7 - that wins also right? |
|
Sep-07-16
 | | PawnSac: like a monday puzzle without Q sac |
|
| Sep-07-16 | | gofer: Material even, but white's pawns are far more advanced that suggests
a rook sacrifice to get them the last gasp to promotion... <53 Rxc7 ...>
53 ... Rxc4
54 Rxc4 Kxd5
55 Rf5
54 ... Ra3+
55 Kg4
<53 ... Kxc7>
<54 f7 ...>
Okay white is going to get a queen for its rook and pawn, but it is
about to lose another pawn (at least) so is this okay or not!!! <55 ... Rxc4>
<56 f8=Q ...>
click for larger viewNow what? How can black avoid the king getting pushed away from attacking
Pd5 and therefore losing the game???
57 ... Rb4
58 Qe7+ Kb8
59 Qc7+ Ka8
60 d6
This looks grim for black, is there anything better???? ~~~
Nope... |
|
| Sep-07-16 | | catlover: A bit easier than is often the case on Wednesdays. |
|
| Sep-07-16 | | posoo: da old posoo almost NEVVER reaches an ENDGAM like dis but found even DIS puzle to be Olimaentary. |
|
| Sep-07-16 | | YouRang: <PJs Studio: But in a game most of you would play 53.Re7 - that wins also right?> Well, Re7 actually slows white down because the rook is guarded by the pawn we wish to advance. We have to move it again before we can push the pawn. It gives black time to play <53...Ra1>,
click for larger view
...and now black's rook is well-positioned to (1) stop our f-pawn, and (2) threaten to advance black's a-pawn. Nothing more than a draw for white here, and if misplayed, white could lose. |
|
| Sep-07-16 | | kevin86: Black's rook is blocked from the f-pawn's file by the white king and the back rank by his own pawn. Now is the time for white to advance the pawn AS QUICK as possible...The rook sac is the ticket here. |
|
Sep-07-16
 | | al wazir: Why didn't white play 11. Bxf4 exf4 12. Qxf4, winning a ♙? Is 12...Be5 13. Qe3 Qh4+ 14. Qf2 really that bad for white? |
|
| Sep-07-16 | | sfm: <A. Wazir: Why didn't white play 11. Bxf4 exf4 12. Qxf4, winning a ♙?>
Hmm. Could it be something with 12.-,Be5 and 13.-,Qh4+ ? |
|
| Sep-07-16 | | catlover: <al wazir> Yeah. Good point. After looking at it for a while and scratching my head, I ran it through Stockfish. Here is a possible line, generated by Stockfish, that might result from the capture and win of a pawn: 11. Bxf4 exf4 12. Qxf4 f5 13. Qd2 O‑O 14. h4 Qe8 15. exf5 Bxf5 16. Nh3 Qe7 17. Nf4 Rae8 18. O‑O‑O Be5 19. g3 a5 It has black as being better by .92. From what I can see, black gets initiative and pressure in return for the pawn. If Dittman saw that, then maybe he preferred not risk giving his opponent attacking chances. |
|
| Sep-07-16 | | Dear Mr. Owen: Hello <chrisowen>! I just became a member after having read some of your older kibitzes and enjoying them a lot. I think some of them are very beautiful. Recently I have had more trouble understanding them, because there are many things in them that are not words, which makes them very difficult to read! Also you have not been putting as many chess variations in them! Just a few thoughts from a friend.
Have a nice day! |
|
| Sep-07-16 | | thegoodanarchist: < PJs Studio: But in a game most of you would play 53.Re7 - that wins also right?> Well, it looks weak to me. Does it lose? I didn't analyze that far, but it looks bad at first sight. |
|
Sep-07-16
 | | FSR: <gofer> ...
<53 Rxc7 ...>
<53 ... Kxc7>
<54 f7 ...>
Okay white is going to get a queen for its rook and pawn, but it is about to lose another pawn (at least) so is this okay or not!!! <55 ... Rxc4>
<56 f8=Q ...>
<57 ... Rb4
58 Qe7+ Kb8
59 Qc7+ Ka8
60 d6
This looks grim for black, is there anything better????> Of course there is: 59...Kxc7! and Black wins! White should avoid 59.Qc7+. |
|
| Sep-07-16 | | drollere: Rxc7, done. |
|
| Sep-08-16 | | PJs Studio: Thank you YouRang, I could've looked at for longer or thrown it onto my engine but I was busy at the 9-5. Thanks man |
|
 |
|
< Earlier Kibitzing · PAGE 2 OF 2 ·
Later Kibitzing> |
Kibitzing
sac: 53.Rxc7