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Samuel Reshevsky vs Bent Larsen
Chess Olympiad Qualifying Group 2 (1968), Lugano SUI, rd 5, Oct-22
Nimzo-Indian Defense: Normal Variation. Gligoric System Exchange at c4 (E54)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Dec-13-09  Quentinc: I too was in love with 40...Rxc6 but I didn't see what Black had after 41 Rf2. He can still try 41...Nf6 but seems to end up down material because everything is hanging.

So then I figured 40...Nf6 had to be it, but I certainly didn't see ..Qa1.

Dec-13-09  BOSTER: <RV> <40.Qg1 avoids this whole mess>. Even after 40...Nf6 41.Qg1 is much better than Nxe5? . This is not protection,because square e5 and h2 are forkable by Ng4, and Ne5 and Kh2 on the same diagonal. It means black queen takes the knight e5 with check. I'd try 41.Qg1 Nxg4+ 42.Kh1 Qd3 43. Nb5.
Dec-13-09  lippizan: 42...Qa1 is really brilliant!
Dec-13-09  VincentL: In this "insane" position, the most forcing continuation I see is 40..... Nf6

Now besides the mating net around white's king, ... Nxg4 is threatened.

Queen moves don't really stop the mating threat, so the only realistic defence I see is 41. Nxe5

Now it is opportune to remove the rook defender, so I think the best move for black is 41.....Rxc2. Adter 42. Bxc2, 42.... Qa1 seems to be the best move.

White's only option is to move the queen now (obviously not 43. Nxd7 Nxg4+)

But after43. Qf4/Qg5 then black simply continues 43... Qxe5 ! Then is 44. Qxe5 Nxg4 forking K and Q.

THis must be it, I think. Seems a bit easy for a Sunday.

Dec-13-09  VincentL: It appears I have indeed solved a Sunday puzzle. I am chuffed.

The moves just jumped out at me today.

Often they don't.

Dec-13-09  CHESSTTCAMPS: Material is even, but white pawns blunt the scope of the light-squared bishop and black's force is much better placed to attack the weakened enemy king position. In particular, the weakness at b4 stands out - what a perfect location for a knight:

40... Nf6

Obvious enough - it threatens both a royal fork and mate in two. Already white's options are quite limited:

A) 41.Rc1?? Nxg4+ 42.Kh3 Nxe3+ wins

B) 41.Qc1?? Nxg4+ 42.Kh3 Ne3+ 43.Kxh4 Qf5+ 44.Kh5 Qg4#

C) 41.Qg1 (the only viable defense) Nxg4+ 42.Kh1

This is where the problem really starts. Black could go into an endgame a pawn up, but with white on the defensive, this makes little sense. The move to press the initiative is

42... Qd3!!

This requires some calculation against white's sharpest reply, but play is substantially forced.

43.Nb4 Qg3!! 44.Rxc7 (Rb2? Rc1! wins, overloading the queen) Nf2+ 45.Qxf2 Qxf2 46.Rxd7 h3! 47.gxh3 Qf3+ 48.Kh2 Qf4+! (picking up the bishop can wait) 49.Kg2 (or h1) Qxe4+ 50.Kh2 Qf4+ 51.Kg2 e4 52.d6 Qf3+ 53.Kh2 Qxg3

White can not defend all of black's threats, such as Qxa3, a5, e3, Qb2+, or 54... Qe6 followed by the advance of the e-pawn. Play might continue:

54.Re7 Qb2+ 55.Kh1 (Kg3? Qxa3+) Qc1+ 56.Kg2 Qd2+ followed by Qxd6 with a won position.

C.1 43.Qb1 Qg3 44.Qg1 (Kg1 Qh2+ 45.Kf1 Qh1+) Qxb3 wins a piece.

C.2 43.Rb2 Qc3 44.Rb1 Qg3 45.Rb2 Bxc6 46.dxc6 (Rxc2 Qxb3) Rxc6 47.Bd1 Rc1 48.Rd2 Rxd1! wins

C.3 48.Kg1 Qg3+ followed by Qxh3+ picks up the rook.

C.4 52.Be1 (or Rc3) Qd2+ wins

C.5 52.Bc2 Qf3+ 53.Kh2 (Kg1 Qg3+ followed by Qxh3+) e3 is winning.

Time to check.

Dec-13-09  CHESSTTCAMPS: Whoa - I missed the game defense.
Dec-13-09  cyclon: <BOSTER: I'd try 41.Qg1 Nxg4+ 42.Kh1 Qd3 43. Nb5.> 41.Qg1 really seems to be a reasonable try, BUT instead of -Nxg4+ I`d play -Qf4+ 42.Kh1 (g3 Nxg4+ NOW) Nxe4, and besides possible tactics and g4-pawn hanging, there is a plan involving moves like -f6,-Rc8 and -h3 at Blacks disposal. Still, I don`t see an immediate win for Black after 41.Qg1.
Dec-13-09  muralman: Got the first move easily enough. I didn't see the white knight defense. I went ahead with the split anyway. I saw white knight takes knight, bishop takes black knight and now we have an interesting stand off with black pawn bishop and queen pressing the white king.
Dec-13-09  butilikefur: <40...Nf6 41. Nxe5 Rxc2 42. Bxc2 Bxg4 43. Qg5 h3> 43...Qf2 44. Nxg4 Qg3+ 45. Kg8 Nxg4 46. Qh5+ (46. Qf5+ Kh6) 46...Nh6 47. Qf3 and going for the perpetual might be better

<44. Qh5+ Kg8 45. Qg3> 45. Qg5+ Kf8 46. Qh6+ Ke7 47. Nc6+ Kd7 and Black gets away

<45...hxg2 46. Qxg2 Qf4+ 47. Qg3 Qh6+ 48. Kg2> 48. Kg1 Qc1+

<48...Qd2+ 49. Qf2> 49. Kg1 Qxc2 50. Nxg4 Qd1+

<49...Bh3+ 50. Kg3> 50. Kg1 Qg5+

<50...Nh5+ 51. Kf3 Qf4+ 52. Ke2 Ng3+ 53. Ke1 Qc1+> 53...Qxe5 54. Qxf7+ is an unneeded hassle

<54. Bd1 Qc3+ 55. Qd2 Qxe5> should win

Dec-13-09  Marmot PFL: Did not spend enough time :), but really it should not be that difficult - just a matter of seeing Qa1 at the end of a forced line. Calculations like that at the end of a long session are where the young players have an edge. Larsen still fairly young in '68, not Sammy.
Dec-13-09  David2009: Sunday's Insane puzzle Reshevsky vs Larsen, 1968 Black 40...?

40...Rxc6 hoping for 41 dxc6 Nf6 42 cxd7 Nxg4+ 43 Kh3 Nxe3 44 Kxh4 Qh1+ 45 Kg5 Qh6#. Alternatives for Black are (in this line) 44 g3 Nxc2 (threat Qh1#) 45 Kxh4 Ne3 and White is still in a mating net. Or (earlier) 40...Rxc6 41 Rxc6 Nf6 42 Rxf6 Qxf6 and Black has won the exchange. No time for more now: time to
check:
====
Black found a simpler win. I will examine my line and other kibitzes later: no time for more now. Perhaps my line is a spectacular loss?


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Reshevsky-Larsen 1968 40...Rxc6 variation (White to play, 41?)

Dec-13-09  WhiteRook48: I had 40...Rxc6 instead
Dec-13-09
Premium Chessgames Member
  mig55: I found this! For the first time I solved a Sunday puzzle....
Dec-13-09
Premium Chessgames Member
  mig55:


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/

Another Reshevsky 1968, is not in datbase, black to play and win.

Dec-13-09
Premium Chessgames Member
  mig55: Black was Larsen too..
Dec-13-09
Premium Chessgames Member
  mig55: Sorry, white played 'Nb4' and then black wins....
Dec-13-09  David2009: I am losing as Black in distinguished company (<dzechiel>, <goodevans>, <Dr. J>). After 40 Rxc6? 41 dxc6 Nf6 I missed 42 Qg1! which refutes the attack: <johnlspouge: [snip] Toga [ply 15/46 value +1.83] 40.<Rxc6> 41.dxc6 Nf6 42.Qg1 Qf4+ 43.Kh1 Nxe4 44.Qc1 Qxc1+ 45.Rxc1 Ng3+ 46.Kh2 Bxg4 47.c7 Bc8 48.Rd1 Kg7 49.Rd8 Bg4 50.c8Q Bxc8 51.Rxc8 e4 52.Rc7 e3 53.Rxf7+ Kg6 54.Kg1 Nf5> Crafty agrees with Toga up to and including move 46, but after 47 c7 prefers 47...e4 which loses quickly.


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Winning practice: Reshevsky-Larsen 1968 40...Rxc6 variation 47? http://www.chessvideos.tv/endgame-t... You are white, drag and drop the move you want to make. Good luck! - not quite as easy as it looks.

Dec-13-09  CHESSTTCAMPS: Thanks to <JimfromProvidence> for posting a better, simpler continuation in the 41.Qg1 line.

Had I considered the simple 41.Nxe5 in response to Nf6, I would like to think that I would have found the key move 42... Qa1 quickly. Perhaps I would, but perhaps not. It seems that a number of accomplished kibitzers missed this key move. This may fall into the general category of missing a retreating queen move (in this case a retreat from the enemy king), a common oversight. A general error that I have made on Sunday puzzles is to automatically look for something complex, when sometimes a relatively simple combination will do the trick. In any case, it doesn't hurt to exercise long-distance visualization regularly, even if some mistakes are made.

Dec-14-09  TheBish: Reshevsky vs Larsen, 1968

Black to play (40...?) "Insane"

I found this a little easier than many Saturday puzzles. Maybe I saw this several years ago, and remembered the pattern, don't know... I think it wasn't too tough in any case.

At first I rejected 40...Nf6 because of 41. Nxe5, so I moved on to 40...Rxc6!? with the idea 41. dxc6 Nf6 42. cxd7 Nxg4+ 43. Kh3 Nxe3 44. d8=Q Qh1#, but 42. Qg1 is a major improvement here, as is 41. Rxc6 Bxc6 42. dxc6 Nf6 43. Qg5. But then I saw more deeply.

40...Nf6! 41. Nxe5 Rxc2 42. Bxc2 Qa1!

The key!

43. Qf4 (or Qg5) Qxe5! 44. Qxe5 Nxg4+ 45. Kg1 Nxe5 and wins.

Time (past time) to check.

Dec-14-09
Premium Chessgames Member
  Fusilli: Against 41.Qg1 I thought of 41...Nxg4+ 42.Kh1 Qf4 (the suggested 42...Qd3, according to the posts, seems to take Black to a winning position about ten moves from now, so I think 42...Qf4 looks better, since it keeps the White queen stuck in g1)


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43.Re2 (what else? Black is threatening the e4) Bxc6 44.dxc6 Rxc6 45.Bc2 Rh6 and White can't stop h3 and Black wins.


click for larger view

Any better defenses for White, anyone?

Dec-14-09
Premium Chessgames Member
  sethoflagos: <Fusilli> With acknowledgements to <JimfromProvidence> (41 Qg1) and <CHESSTTCAMPS> (42 ... Qd3) I'm wondering whether the sharpest line isn't 41 Qg1 Qd3 which looks to have best tempo 40 ... Nf6
41 Qg1 Qd3 immediate threat to B/R
42 Nb4 ... only real counter
43 ... Qg3+ forcing
44 Kh1 Rxc2 main thorn disposed of
45 Bxc2 Nxg4 threatening Nf2+
46 Nd3 f5 WQ,B,N fully committed
47 exf5 Bxf5 and white has nothing but futile checks

48 Qa7+ Kh6
49 Qb6+ Kh5 the checks run out
50 Qg1 Bxd3 threatens Nf2+
51 Bd1 Be4 turn the screw
52 Bxg4 Qxg4
53 d6 ... nothing else
54 ... h3
55 Qf1 ... or forced mate
56 ... hxg2+
57 Kg1 gxf1=Q+
58 Kxf1 Bd3+
59 Kf2 Qf4+
60 Ke1 Qe3+
61 Kd1 Qe2+
62 Kc1 Qc2#

I think this is pretty well forced all the way

Dec-14-09
Premium Chessgames Member
  Fusilli: Good line, <sethoflagos>. I think 46...e4 (instead of 46...Bxf5) wins faster, since Qa7 is not check and White would get mated if the Queen moves.

Notice that 42.Qe1 (instead of 42.Nb4) fails to 42...Nxg4+ 43.Kh1 Qxb3 44.Qxh4+ Nh6.

Dec-14-09
Premium Chessgames Member
  patzer2: For the Sunday, Dec 13, 2009 puzzle solution, Larsen's 40...Nf6!! creates a decisive Knight Fork threat which remains surprisingly alive and well even after Reshevsky's best defensive try.
Dec-15-09  butilikefur: <43. Bd3> kills it
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