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| Mar-07-08 | | zooter: Looks like the plan for black would be to play
44...Ra2+ 45.Kf1 d4 46.Rc4+ Kd6 47.Rd8+ Kc6 with the threat of 48...e3 This is way beyond me, but that would be my general plan...time to check what really happened |
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| Mar-07-08 | | zooter: 44...Ne1 with the idea of 45...Nf3
quite tough...
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Mar-07-08
 | | YouRang: I couldn't find a solution, but didn't feel so bad after checking with a computer: 44...Ne1 45. Rfb8! Nf3 46. Rb1 ends the mating threat: Black is just slightly better. Not really much of a puzzle, IMO. |
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Mar-07-08
 | | dzechiel: Black to play. Material "even" (black has two pawns and a knight for a rook). "Difficult." The first thing to do here is come up with a plan. What is black trying to accomplish in this position, and how can he improve his position. Naturally black would like to get those pawns rolling down the board. I think if black could eliminate white's f-pawn (even if it meant exchanging rooks), the knight would be able to escort the d- and e-pawns down the board. It's possible that black can weave a mating net, but I don't see it if it's there. I guess I should list some candidate moves and see if I can get any of 'em to work. How about: - 44...Re1+
- 44...Nc1+
- 44...Kd4
- 44...Ra2+
I think the first of these, 44...Re1+, can be safely eliminated as after white plays 45 Kd2 black has no good way to make progress without moving the rook to a better square. After 44...Nc1+ 45 Kd2 once again I don't see a way for black to improve his position. Besides, the knight needs to stay on d3 to cover b4 should the black king advance. I really think the key move is the most forcing:
44...Ra2+
White can't play 45 Ke3 because 45...d4# would be mate. And 45 Kd1 is no good because of 45...Nxf2+ and the black pawns WILL get moving. That only leaves 45 Kf1
So what now for black? I think it must be
45...e3
This move has a threat that can't be ignored (46...e2+ and 47...e1=Q). White is compelled to take the pawn with 46 fxe3 Ke4
Note how the knight covers b4 to prevent unwanted checks on b4 and f4. And white can't defend the pawn on e3. If white attacks the pawn on e6 black can simply play ...e5 and once again the knight saves the day. Not to mention that white's h-pawn is in jeopardy. I'm not sure what is white's best here. It seems to me that something like 47 Rd8 is in order, but it's not clear at all. I don't think that white has time to snatch the g-pawn. My wife wants my attention (not what you think) and I'm going to have to finish up here. I'm no longer convinced that 45...e3 is the move. Perhaps 45...Kd4 is correct followed by 46...e3. In any case, time to check and see what was actually played. ===
Wow. So simple, but I never considered it. My wife has saved me a lot of time looking for a win that wasn't there. |
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Mar-07-08
 | | White Star: I see now! after 45) ...Nf3 the threat is 46)...Re1++ |
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| Mar-07-08 | | jheiner: The basic idea here jumped out to me. I saw the Rook+Knight+Pawn mate, except the Knight is on the wrong side. The Knight must be on the same side as the enemy pawn, on f3 in this case. For anyone unfamiliar with this mating pattern (and for others) try: http://www.markalowery.net/Chess/Ch... |
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| Mar-07-08 | | Tactic101: This was absolutely beyond me. Some thinking, but all irrelevent and misguided I think the idea is kind of obscure. I'll fire this up on the comp and see what it thinks. |
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| Mar-07-08 | | zb2cr: Missed it. I never thought of moving the Knight. |
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| Mar-07-08 | | D.Observer: I thought of 44. ... Re1+ until I read your post, <dzechiel>. |
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| Mar-07-08 | | AnotherNN: Saw 44. ...Ne1 but felt there were too many unanswered questions. What of 45. Kf1, or f4+, or Rb2, or R(b)f7 ... and so on. True, with the strong passed pawns Black might finally grind out the win, but really nothing pretty "tight". |
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| Mar-07-08 | | Alphastar: I missed the mating pattern. My move was 44. ..Kd4 with the idea of Ra2+ and e3 with some back rank threats against the white king.
44. ..Kd4 certainly isn't wrong since black can then try Ne5-f3 with similar threats as in the game, white will be forced to sacrifice his extra exchange again. But I didn't see this idea (Ne5-f3). <YouRang: I couldn't find a solution, but didn't feel so bad after checking with a computer:44...Ne1 45. Rfb8! Nf3 46. Rb1 ends the mating threat: Black is just slightly better.> Actually I think black has a won ending after, say, 46. ..Ra2+ 47. R8b2 Rxb2+ 48. Rxb2 Nxh2. Certainly the rook isn't that much stronger than the knight with all the pawns on one side of the board, and black has 3 extra pawns to boot. |
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Mar-07-08
 | | johnlspouge: Friday (Difficult): Black to play and win
Material: N+2Ps for R. The White Rb7 can capture Black's Pg7 and Ph7. The White Ke2 has a single escape square d2. Black has a cluster of central Ps, from which 2 passers can emerge. Only Pf2 prevents the creation of the central passers. Candidates (44...): Ra2+, Re1+
In a game, I would probably take a draw with
44...Re1+ 45.Kd2 Rf1 46.Ke2 [else, lose Pf2] 47.Re1+ with repetition. However, this is Friday, so one must suffer.
44...Ra2+ 45.Kf1
The brutal approach does not work.
45...Rxf2+ 46.Rxf2 Nxf2 47.Kxf2
The White Kf2 now goes to e2 or d2, as required. Unfortunately, in this line, Black's progress is too slow while the Rb7 captures Pg7 and Ph7. After 45.Kf1, however, another line permits the Black Ke5 to enter. 45...e3 46.fxe3 Ke4 47.Rxg7
[else, Black has no counter-threats and passively watches the Pe6 and Pd5 slither toward him] 47...Kxe3 (threatening 48...e5 and 49...Ra1+)
A comparison with the original position shows Black has made progress. He will advance Pe6 then Pd5, banish Kf1 with Ra1+, force the exchange of R for N+P, and then win with the remaining passer. Time to peek. According to Toga II 1.3.1 (which is undependable in endgames like this), my line is a draw, because White's Ps advance too rapidly. I will analyze further in the evening, but like everyone else, I missed the game line, improving the position of Black's N. |
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| Mar-07-08 | | MarkThornton: I completely failed to spot, or even consider <44...Ne1>. An impressive finish by Uhlmann! |
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| Mar-07-08 | | Kwesi: argh... I realised that it would be mate if the white pawn was on d2 instead of f2, but even after that I still didn't think of what was played in the game... oh well |
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Mar-07-08
 | | gawain: I did not see it. I feel OK about it, however, if <Dzechiel> missed it too. The way the mate threat suddenly emerges is marvelous. I suspect Enders did not see it coming until the knight actually landed on f3. The wrap-up after W averts that threat is a little messier than usual. Still B gains a winning advantage regardless of what B tries after 44..Ne1 |
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| Mar-07-08 | | JG27Pyth: I guess I'm not alone thinking this one was pretty tough. <jheiner: The basic idea here jumped out to me. I saw the Rook+Knight+Pawn mate, except the Knight is on the wrong side.> Knowing the mate sure would have helped. I'm looking at that Mark Lowery site now, to see what other classic mates I don't know. This is one of those endings where sometime around move 44 it's says in a book: "and the rest is technique..." and you just want to set your hair on fire. |
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| Mar-07-08 | | Magic Castle: Ne1 is just too brilliant. |
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Mar-07-08
 | | kevin86: I was looking for an Arabian Mate threat,while Mr. Uhlmann was able to execute one-white had to give up his rook for the knight and black's passed pawns won the day. The simplest version of the Arabian Mate:
click for larger viewWhite mates by Rh7# or even place the rook on the g-file and mate at g8. |
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| Mar-07-08 | | mworld: wow - I wish i could understand the endgame as well as uhlmann clearly does in this game! Beutiful play. |
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Mar-07-08
 | | Marmot PFL: I played over a very similar ending last night, so spotted the Ne1-f3 idea right away. Also stopping f4+ is very useful to keep black's king safe on e5 from nasty rook checks. White has to give back the exchange to stop mate and at that point I was not sure the rook ending was won, but could see it was very promising because f2 was vulnerable. |
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| Mar-07-08 | | Jason Frost: <YouRang: I couldn't find a solution, but didn't feel so bad after checking with a computer: 44...Ne1 45. Rfb8! Nf3 46. Rb1 ends the mating threat: Black is just slightly better.
Not really much of a puzzle, IMO.
>
Fritz sais its won for black
Giving
(-1.44) after Ne1: f4+ exf3 Kd2 g5 Rb3 Kd4 Rb4+ Kc5 Rb7 g4(-1.97) Rfb8 Nf3 Rb1 Ra2+ R1b2 Rxb2 Rxb2 Nxh2 Rb7 Kf6 But agree it's a wierd puzzle.
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Mar-07-08
| | Marmot PFL: <YouRang> I missed that defence completely, which is no big loss since black had nothing better anyway. Just shows why computers are no longer beatable by humans 98% of the time. |
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Mar-07-08
 | | whiteshark: I envy Uhlmann's calm here. |
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| Mar-07-08 | | wals: Noting think:- Stoking up the boilers for another assault on the problem of the day. Black is down a rook for a knight,and up two pawns.
Under threat from f4+.
44. ...Rg1 45.f4+ ...Kd4 keeps black in the game
check outcome // missed the obvious 45. Rxg7 Not even close - it's a lonnnng way to the top if you want to be a GM. brain score L 0.01 R 0.00 |
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Mar-07-08
 | | DarthStapler: Wow, I didn't even think of that |
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sac: 36...Rd2