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Wolfgang Uhlmann vs Bent Larsen
EU-chT prel (1971), Aarhus DEN, rd 5, Nov-??
Modern Defense: Averbakh Variation (A42)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Dec-10-09  TheaN: Thursday 10 Decemeber 2009

<49.?>

Target: 3:30;000
Taken: 4:04;033

Material: White up, ♙

Candidates: Rh6, Rg8, h4, pretty much any N move except for <[Nxc5]>

-ML-
With the Knight en prise and the g5-pawn two times in it seems that White is going to lose his pawn advantage. King hunts do not really work on either side which might seem obvious. White has one trick to abuse the 6th rank setup:

<49.Nxc5!> obviously, this takes the Knight out of jeopardy and attacks Black's to boot. Taking g5 with the King is suicide because of Nxe4. Capturing the Knight is impossible due to the 6th rank skewer.

/A\
<49....Nxc5 50.Rh6 Kxg5 51.Rxd6 > and this should be won for White, especially with the weak c-pawns. So, in order to slightly maintain material balance Black should capture on g5 with the Knight. However, this is the cherry on the cake for this puzzle:

/B\
<49....Nxg5 50.Rg8 Kf6 51.Rxg5! > and of course, 51....Kxg5 52.Ne4 loses, so Black is down a piece. Pretty much any other move to protect or remove the Black Knight is better, but two healthy passed pawns up should be no problem for White. Time to check.

Dec-10-09  TheaN: 4/4

I now notice that there aren't that much moves for Black to do, I did see that after 49....Rd2, e4 is still the fatal forking spot, and that this actually immobilizes Black. After either 49....Rd4 or 49....Rd2 50.Kc1 Re2, White wins rather technically with 50./51.Nxe4 Rxe4 51./52.h4 .

Dec-10-09  A Karpov Fan: got it
Dec-10-09  zb2cr: <Jimfromprovidence>,

Your response for Black, 49. ... Rd2+, was why I abandoned 48. Nc5; I figured that after 50. Kc1, Re2 Black has protected his Knight and removed his Rook from danger. Argghhh. Bad board vision!

Dec-10-09  lzromeu: Its seemns to be a drawing position


click for larger view

Dec-10-09
Premium Chessgames Member
  johnlspouge: Thursday (Medium):

Uhlmann vs Larsen, 1971 (49.?)

White to play and win.

Material: Up a P, with connected passed Ph3 and Pg5. The Black Kg6 has 2 legal moves, both light squares. The Black Kg7 and Rd6 are on the same rank for an x-ray Rh8-h6+, suggesting a possible clearance by Ne6. The White Kc2 is vulnerable to the presently harmless Rd6-d2+.

Candidates (49.): Rh6+, Nxc5

49.Nxc5 (threatening 50.Nxe4+ and if Ne4 moves, 50.Rh6+ 51.Rxd6)

49Rd2+ 50.Kc1 (threatening 51.Nxe4 and if Ne4 moves, 51.Kxd2)

50...Rd4 51.Nxe4 Rxe4 52.h4

White has a won R+4P vs. R+2P endgame.

I missed the 49...Nxg5 defense, as usual.

Dec-10-09  cydmd: <lzromeu>, you gotta be kidding !!! 2 pawns is enough material advantage for a GM to resign ...
Dec-10-09  zanshin: I got <49.Nxc5>. I think this was easier than yesterday. I can't really add anything to the comprehensive analyses already posted.
Dec-10-09  JG27Pyth: After Carlsen's fantastic Nc5 yesterday, was there any doubt today's solution could be anything else? ;) Nice one CG! Or was this just coincidence.

But I rejected Nxc5 today because after Nxg5 Black looked ok to me... what's the follow on?

Dec-10-09  JG27Pyth: Answered my question -- got it from TheaN's post. Thnx.
Dec-10-09  zanshin: Rybka 3 top three moves. Notice that <49.Rh6> is discarded after only 2 plies.


click for larger view

[+3.56] d=23 49.Nxc5 Rd2 50.Kc1 Re2 51.Nxe4 Rxe4 52.h4 Kg7 53.Rh6 c5 54.h5 Rg4 55.Rg6 Kh7 56.Kd2 Rg3 57.b3 Rxb3 58.Ra6 Rb2 59.Kc3 Rb7 60.Rc6 Rd7 61.Kc4 Rd4 62.Kxc5 Rg4 63.Rc7 Kg8 64.Rc8 (0:05.37) 41759kN

[+0.63] d=2 49.Re8 (0:00.00) 0kN
[+0.50] d=2 49.Rh6 (0:00.00) 0kN

Dec-10-09  zanshin: I got curious .. what's so bad about <49.Rh6+>? Apparently, it's not really that bad.

After <49.Rh6+>:


click for larger view

[+1.88] d=23 49...Kf7 50.Nf4 Rd2 51.Kc1 Rf2 52.g6 Kg7 53.Rh7 Kg8 54.Nh5 Rf5 55.h4 a5 56.Kc2 Rd5 57.Nf4 Rd2 58.Kb1 Rf2 59.Nd3 Rf1 60.Ka2 a4 (0:14.30) 107820kN

Dec-10-09
Premium Chessgames Member
  kevin86: What a strange move! It looks like white wants to lose,but the move is a winner! The knight is attacked and the rook is threatened by a skewer IF black captures the knight.

White will exchange knights and the extra two pawns will win-though rook endings are rarely a slam dunk.

Dec-10-09
Premium Chessgames Member
  chrisowen: The arsenal of rook and knight queers black's pitch and has Larsen bent over backwards. I assume it was Nc5. Nevermind Nxg5 it cant go on erstwhile the rook is in position to check, winning back the piece. If the Knight wants c5 g5 combines to support the rook. Gang flow the pawns and take the knight if the rook do a check. Wolfgang's harmonic Nc5's a nice finish in all.
Dec-10-09  YouRang: Got pretty quickly: 49.Nxc5! wins a pawn, and creates a double threat:

(1) sets up the Rh6 skewer by [a] removing the defender of black's rook and [b] vacating the 6th rank.

(2) attacking black's knight directly.

Dec-10-09  jpolchinski: If 42 ... Kxg5, the followup takes some calculation, I think: 43 Rh5+ Kf6 44 Rxd5 cxd5 45 Kxd3 a5 Now, W can't make the break 46 b4 because of ... cxb4 47 axb4 a4, and one of the B pawns will queen. So 46 b3 Kg5 47 Ke3. Now, any B pawn advance loses, so the K must retreat and yield Kf4, followed by Ke5.
Dec-10-09  Eduardo Leon: The black knight supports the rook in case of 49.♖h6+, so first we play 49.♘xc5. The knight exchange is forced after 49...♖d2+ 50.♔c1 ♖e2 51.♘xe4 ♖xe4, or simply 49...♖d4 50.♘xe4 ♖xd4. I think the first line is slightly better for black, because he first drives the king away from the center. In any case, with two extra passed pawns which will be soon connected after h4, white's position is already won.
Dec-10-09  Marmot PFL: Look at captures, only one - 49 Nxc5 Nxc5 50 Rh6+ nice, but what if 49... Nxg5? 50 Rg8+, Rxg5 and Ne4+ winning. This was only found after seeing that 49 Rh6+ led nowhere.
Dec-10-09
Premium Chessgames Member
  Jimfromprovidence: Note one move before the puzzle, after 47...Kh5. White missed 48 Nf4+!, creating an unstoppable passed pawn.


click for larger view

After 48...Kh4 49 g6, black is in deep trouble.


click for larger view

Dec-10-09  WhiteRook48: don't ask me why but i went for 49 Rh6+ instead
Dec-10-09
Premium Chessgames Member
  Check It Out: 49.Nxc5

A: 49...Nxc5 50.Rh5+ wins the exchange

B: 49...Nxg5 50.Rg8+ Kf6 or h6 51.Rxg5+ Kxg5 52.Ne4+ wins a piece

C: 49...Rd4 50.Nxe4 Rxe4 51.Kd3 R moves 52.h4 two pawns up but still a tricky endgame; don't know if that qualifies as a solution.

Let's check it out...

==========

Surprised by the quick resignation.

Dec-10-09
Premium Chessgames Member
  Once: Odd how 49. Nxc5 leaves black totally helpless. Perhaps centralised pieces can sometimes be a hindrance rather than a strength because they are more vulnerable to pins, forks and skewers?
Dec-10-09  GreenFacedPatzer: Missed it.

49 Nc5 is a nice shot; I just didn't consider the move. I spent a good deal of time looking at possible variations after 49 Rh6+, and convinced myself that white was always winning, but there were too many variations to claim I understood the whole future thereafter. My main line was

49 Rh6+ Kf5 (Kf7 lines seemed worse)
50 g6 Rxe6
51 g7

and black either loses his rook and faces a R vs N game, or takes white's rook and face Q vs R+N. Either way white's got an advantage, but not necessarily a win.

The game move's a lot clearer and better, of course.

Dec-10-09  WhenHarryMetSally: I believe I may have come close to the answer for this one. Black is down a pawn. Whites pawn and knight are under threat. White has to either protect his pawn and lose the knight, or protect the knight and lose the pawn. Or does it?

49. Rh6+, Kf7 [if Kf5 then 50. Ng7+ and then black will lose his rook while white seeks to coronate].

50. Pg6+

And now the coronation seems imminent.

Ill check now to see if Im on the right path. Fingers crossed! xxx

Dec-12-09
Premium Chessgames Member
  patzer2: For the thursday, Dec 10, 2009 puzzle solution, White's clearance sham sacrifice 49. Nxc5! wins with the double threat of a skewer or a Knight Fork as concisely analyzed in <al wazir>'s post.
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