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Peter Enders vs Wolfgang Uhlmann
GDR-ch (1978), Eggesin GDR, rd 1, Feb-??
French Defense: Advance Variation. Main Line (C02)  ·  0-1

ANALYSIS [x]

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sac: 36...Rd2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-07-08  zb2cr: Missed it. I never thought of moving the Knight.
Mar-07-08  D.Observer: I thought of 44. ... Re1+ until I read your post, <dzechiel>.
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".
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.

Mar-07-08
Premium Chessgames Member
  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.

Mar-07-08
Premium Chessgames Member
  MarkThornton: I completely failed to spot, or even consider <44...Ne1>.

An impressive finish by Uhlmann!

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
Mar-07-08
Premium Chessgames Member
  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

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.

Mar-07-08  Magic Castle: Ne1 is just too brilliant.
Mar-07-08
Premium Chessgames Member
  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 view

White mates by Rh7# or even place the rook on the g-file and mate at g8.

Mar-07-08  mworld: wow - I wish i could understand the endgame as well as uhlmann clearly does in this game! Beutiful play.
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.
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.

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.
Mar-07-08
Premium Chessgames Member
  whiteshark: I envy Uhlmann's calm here.
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

Mar-07-08
Premium Chessgames Member
  DarthStapler: Wow, I didn't even think of that
Mar-07-08  YouRang: <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. >

I'm not so sure I'd call it won for black. The computer assessment is mostly based on material.

In practical terms though, I think it will be very difficult for black to make progress, with the K+2P blocking black's pawns, and a rook attacking from the rear. Black's knight would have no chance to fork K+R, and white should be able to defend his pawns.

I suspect it would be drawn, but it would be interesting to play it out. :-)

Mar-07-08  YouRang: <I suspect it would be drawn, but it would be interesting to play it out. :-)>

Or, I might be wrong. :-p

I've been checking it out with the computer, and it looks like black can get a passed h-pawn, supported by the knight to get a winning game.

Anyway, it's a weird puzzle. That much I know. :-)

Mar-07-08
Premium Chessgames Member
  Jimfromprovidence: Black played the position perfectly in this puzzle. Not only did he protect his f pawn after 47...exf3 with some patient, subtle moves, he was able to position himself to win white's f pawn after 52...Rf1.

In the puzzle sequence, the only thing I thought that white could have done differently was to play 45 Rbf7 instead of Rxg7.


click for larger view

Now when black plays 45...Nf3 and is followed by the text 46 Rxf3 Ra2+ 47 Ke1 exf3 then 48 Rxf3 captures black's f pawn immediately, giving white stronger drawing chances.


click for larger view

Mar-07-08  012: Thursday puzzle <25. ...?> Mar-06-08 Quinteros vs Christiansen, 1981
Mar-07-08
Premium Chessgames Member
  offramp: <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.>

My computer beats me at chess but it is no match for me at kick-boxing.

Mar-07-08  Checker2: Thanks 012 for answering my unasked question of what was Thursdays puzzle. Having actually solved today's (at least the text's first four moves while missing some of the posted defenses ie Jason Frost's and Jimfromprovidence's), as well as having solved Mon-Wed, I was wanting to know what yesterday's puzzle was so I can see how far the perfect week goes, not having had time yesterday to look at it. (A pluperfect posting for potentially perfect puzzles.)

I discovered the mating position in a nonlinear way, by imaging chasing the king to g2 with a couple of A file rook checks, then Ne1+, now if wishes were tempi, seeing the strength of black moves Nf3, (Rg1+), h4 Rxh2#, but once I how strong the knight was on f3 and lacking tempi, I considered the direct route and liked it.

So while the nonlinear seems to be working for me, it's on from Friday to Thursday!

Mar-08-08
Premium Chessgames Member
  patzer2: For yesterday's Friday puzzle solution, Black's clever endgame tactic 44...Ne1!! sets up mating threats to force White into a lost Rook and Pawn ending.
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