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K V Shantharam vs Gregory Kaidanov
Gausdal (1991), Gausdal NOR, rd 2, Jul-??
English Opening: Agincourt Defense. Agincourt Variation (A13)  ·  0-1


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Kibitzer's Corner
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Feb-13-10  cyclon: A very nice puzzle today. My suggestion: 1./ 29.Qxf7+ Kxh6 30.Rxc5 (threat 31.Rh5X) -f5 31.g4 with a treat 32.g5+ brings disaster for Black no matter how he counter-sacrifices, f.e. -Rg8 32.g5+ etc, or -Bxc5? 33.g5X. Some alternatives for 30. -f5 are > 30. -Bxc5 31.Qxf6+ Kh5 32.Qg5X/30. -e5 31.Nh4 and mate by 32.Nf5X is unavoidable/30. -Rd5 31.Rxd5 exd5 32.Nh4, mates/30. -Ne5 (an interesting try, but inadequate) 31.fxe5 (Rxe5!?) -Rd2 (other moves seems to lose as well -fxe5/f5 32.Qxe6+/31. -Rxc5 32.Qxe7/31. -Rd5 32.Rxc8/etc.) 32.Rxf6+ Bxf6 33.Qxf6+ Kh5 34.Qh4+ (Nf4?) -Kg6 35.Nf4+ Kf7 (or -Kf5 36.Qxh7+ Kg5/g4 37.Qh5X) 36.Qxh7+ Ke8 37.Qg8+ Kd7 38.Qf7+ Kd8 39.Nxe6X. THEN, another line: 2. 29.Qxf7+ Kh8, I'd suggest strange looking 30.Nh4 with a plan Qxe6, Nf7+ and Nf5. Also Rxc5 hangs in the air. I prefer Whites position/game.
Feb-13-10  abuzic: TheBish:
[29. Qxf7+! Kxh6 30. Rxc5! Rg8! and I didn't have a good answer for this. Back to the drawing board!]

30. Rh5#!

Feb-13-10  miseiler: I spent quite a long time trying to make Qg4+ and Qxf7+ work, when I finally realised that if the rook was on c5 all my problems went away.

Wonderful problem.

Feb-13-10  Jane Sanders: My solution followed the game line - a miss.
Feb-13-10  OBIT: Ha, so the overnight analysis concludes that 29. Rxc5 is even better than 29. Qxf7+! I really like these positions where the game continuation seems to work but there is another move just as good or better. The reason I like them is in the way they separate the pretenders from the posters who are really thinking for themselves. The pretenders quote the game continuation, giving reasons why these are the only moves that make sense, and pat themselves on the back for seeing everything. Then the independent thinkers enter the discussion with "yeah, but what's wrong with ...." and mention a different move. The puzzle two days ago is the same way.

Let me get back to two loose ends from last night. The first was what to do after 29. Rxc5 f5. Looking at it this morning, I have no doubt that 29. Rxc5 f5 30. Qxf7+ Kxh6 31. g4! is crushing, the main threat being Rf3-h3#.

That leaves 29. Rxc5+ Rf8 30. Qg4+ Kh8 (or, by transposition, 29. Rxc5+ Kh8 30. Qg4 Rf8). After 31. Rh5, <RandomVisitor's> Rybka analysis gives White a strong plus. What is not obvious from the computer analysis is that White threatens a forced mate by 32. Nf5! Rg8 (or 32...exf5 33. Qxf5 followed by Qxh7#) 33. Rxh7+! Kxh7 34. Qh5#. Black can stop the mate with 31...Nd4, which is the move preferred by Rybka, but it just drops a piece. 31...f5 looks like a better try for a human, but, as <stukkenjager> analyzes on page 1, 32. Nxf5 Bf6 33. Rh3 followed by Qh5 wins.

Feb-13-10  Yodaman: ▼ (?) 30.Rxc5!! f5 (30...Rd5 31.Rxd5 exd5 32.Nh4) 31.g4! Rg8 32.Rf3!! Rd1+ 33.Kf2 Rxg4 34.Rh3+ Bh4 35.Rxh4+ Rxh4 36.Qf6+ Kh5 37.Qg5#
Premium Chessgames Member
  kevin86: The master goofed here with his syntax (move order)
Feb-13-10  remolino: I solved this problem conceptually. I thought: "Black's queen is out of play, King is in danger, we can sac but we cannot mate unless we make one if not two rooks active. ...Qxf7 is the first move to keep the king on the edge of the board, g4 will be played at some point, along with ...Rxc5, etc., etc."

The problem is I oculd not put the moves together in the right order... and so conceptually, I really did not solve much.

Premium Chessgames Member
  Jimfromprovidence: If black plays 28...Kh8, instead, then it looks like playing 29 Rxc5 does not do white any any good.

click for larger view

Now there is no check for white's queen on f7, as is the case with the text, making 29...Bxc5, below, playable for black.

click for larger view

White needs to find another way to win.

Premium Chessgames Member
  johnlspouge: Saturday (Very Difficult)

K V Shantharam vs Kaidanov, 1991 (29.?)

White to play and win.

Material: N for B+P. The Black Kg7 has 2 legal moves, both dark squares on the back rank, and is vulnerable to Nh6-f5+ and Qh5xf7+. White needs to bring up reinforcements. The candidate 29.Qxf7+ is interesting, because it strips away shelter and puts Kg7 in a box. The White Kg1 is secured from check.

Candidates (29.): Qxf7+, Qg4+, Nh4

I was unconvinced by any candidate I posed, because I did not see the follow-up 30.Rxc5.

Feb-13-10  sileps: Strange position. Very chaotic. The move 29.Qxf7+ doesn't seem to be doing much good other than the fact that it's forcing. Hmm. This has to be one sick move..

After looking at this position for 20 minutes I can't find a reasonable defense for 29.Rxc5. I think this must be it.

If black chooses to capture the rook:

29.Rxc5 29..Bxc5 30.Qxf7+ 30..Kxh6 (30..Kh8 31.Qxf6# is now possible) 31.Qxf6+ 31..Kh5 32.g4+ 32..Kxg4 33.h3+ 33.Kxh3 34.Rf3#

So black has to defend. There are alot of ways to do this;

29..Rf8 is losing to the kamikaze move order of 30.Rg5+ 31..fxg5 32.fxg5 which brings our little rook into the party and black has essentially the same issue as before.

29...f5 30.Nxf5+ looks promising and white still has a strong, possibly lethal attack. Didn't bother finishing the line here but.

Gah, the text move was 29.Qxf7+ which made me really sad until I discovered that 29.Rxc5 seems to be favored by rybka.

Feb-13-10  sileps: No wait, scratch that. 29..Rf8 30.Qg4+ is better. Black can defend after 30.Rg5+, I'm just sloppy as usual
Feb-13-10  David2009: Turning to the ending, Black steadily gained ground but White could have drawn at move 50.

click for larger view

The Black Bishop does not control h1, so 50 Kd3! (heading for h1) draws. The shutout 50...Kf3 does not work because 51 Nf2 gets the N back into play via e1 or d4. One possible continuation is 50.Kd3 Kf3 51.Nc2 h4 52.Nd4+ Kf2 53.Ke4 h3 54.Nf5 Bd6 55.Nh6 Kg2 56.Ng4 Kg3 57.Ne3 Bc5 58.Nf1+ Kg2 59.Kf4 and the draw is clear e.g. Bd6+ 60.Kg4 Bc5 61.b4 (the quickest draw, but Kf4 and Kh4 also work) Bxb4 62.Ne3+ =. Against 50 Kd3 Crafty as Black plays h4 allowing 51 Ke2 drawing.

Crafty links to defend the position as White: and to attack with colours reversed

Feb-13-10  WhiteRook48: I wanted Qg4+
Feb-13-10  Samagonka: Is this the hardest Saturday puzzle ever and with the longest solution?
Feb-13-10  scormus: Commiserations to <Samagonka and others> I'm glad I'm not the only one who thought it was difficult, even for a Saturday. I'll take some satisfaction over 29. Rxc5, but I regret I missed the key move a bit later in my follow up. <sileps> I also tried 29 ... Rf8 30 Rg5 fxg5 32 fxg5 but I though black is safe after Qf8. Or is he? have I missed something? I suppose if a player nudging 2600 doesn't pick the best line, it must have been tough.
Feb-13-10  sileps: scormus, yes he is, unless I'm wrong again. Hence my "scratch that black has defenses to Rg5+"-comment. =)
Feb-13-10  RandomVisitor: <jimfromprovidence><If black plays 28...Kh8, instead, then it looks like playing 29 Rxc5 does not do white any any good... Now there is no check for white's queen on f7, as is the case with the text, making 29...Bxc5, below, playable for black... White needs to find another way to win.> After 28...Kh8, 29.Nxf7+ seems to win for white:

1: K Shantharam - Gregory Kaidanov, Gausdal 1991

click for larger view

Analysis by Rybka 3 : <16-ply>

<1. (3.44): 29.Nxf7+> Kg8 30.f5 Rd2 31.fxe6 Rxg2+ 32.Kxg2 Nd4+ 33.Kg1 Nxe6 34.Nd6 Ng5 35.Nxc8 Qxc8 36.h4 Nf7 37.Qd5 Kg7 38.a4 bxa4 39.bxa4 Qg4 40.Rb1 Bd6 41.Qf3

2. (1.04): 29.f5 Ne5 30.Nxf7+ Nxf7 31.Qxf7 Qb7 32.Nf4 Rf8 33.Qh5 Qe4 34.Nxd3 Qxd3 35.Rb1 Qxe3+ 36.Kg2 e5 37.Qf3 Qxf3+ 38.Kxf3 Rc8 39.a4 Kg7 40.Rfd1 Rc7 41.axb5 axb5 42.Ke4 c4 43.bxc4 Rxc4+ 44.Kd5

Feb-13-10  Marmot PFL: I bet white was kicking himself for letting this one get away. Kaidanov didn't give him any chance in the ending either. That's how the pros are, you only get one chance if that.
Feb-13-10  wals: 29.Rxc5

1. (5.03): 29...Kh8 30.Qg4[] Rf8 31.Rh5[] Rd5 32.Rxd5[] f5 33.Nxf5[] Rg8 34.Qh5[] exf5 35.Qxf5 Qc8 36.Rc1 Qxf5 37.Rxf5 Rg6 38.b4 Kg7 39.Rd5 Bf8 40.f5 Rh6 41.g4 Ne7 42.Rd7 Rc6 43.Rxc6 Nxc6 44.Rd5 Kf6

2. (5.03): 29...Rf8 30.Qg4+[] Kh8 31.Rh5[] Rd5 32.Rxd5[] f5 33.Nxf5[] Rg8 34.Qh5[] exf5 35.Qxf5 Qc8 36.Rc1 Qxf5 37.Rxf5 Rg6 38.b4 Kg7 39.Rd5 Bf8 40.f5 Rh6 41.g4 Ne7 42.Rd7 Rc6 43.Rxc6 Nxc6 44.Rd5 Kf6

Rybka 3 1-cpu: 3071mb hash: time 2 hours 6min 44sec: depth 21: (, 14.02.2010)

Premium Chessgames Member
  Jimfromprovidence: <RandomVisitor> <After 28...Kh8, 29.Nxf7+ seems to win for white:

Analysis by Rybka 3 : <16-ply>

<1. (3.44): 29.Nxf7+> Kg8 30.f5 Rd2 31.fxe6 Rxg2+ 32.Kxg2 Nd4+ 33.Kg1 Nxe6 34.Nd6 Ng5 35.Nxc8 Qxc8 36.h4 Nf7 37.Qd5 Kg7 38.a4 bxa4 39.bxa4 Qg4 40.Rb1 Bd6 41.Qf3>

This Rybka solution is baffling as it brings up additional questions. What does Rybka see that says that black's 30...Rd2, which loses right away, is better than 30...e5, below?

click for larger view

30...e5 at least prevents 31 Rf4. Unless white sacrifices the knight first, how can the rook get to g4?

Secondly, if the text 28...Kg7 is not the losing move after 28 Nh6+, then what is?

Feb-13-10  wals: Rybka 3 1-cpu: 3071mb hash: time 3 min 5 sec: depth 17:


1. (-1.42): 29...Rf8 30.Qh6+ Kg8[] 31.Ng5 fxg5[] 32.fxg5 Rxf1+[] 33.Rxf1 Qe8[] 34.Qxe6+[] Kh8[] 35.Nh4 Rd6 36.Qg4 Qg8 37.Nf5 Qe6 38.Qf4 Rd3 39.a4 Rxb3 40.axb5 axb5 41.g6 Qxg6 42.Nxe7 Nxe7 43.Qe5+ Qg7 44.Qxc5 Rb2

2. (-0.32): 29...Nd8 30.Nxd8 Rcxd8[] 31.Qg4+ Kf7 32.Qh5+ Kg8 33.Qg4+ Kf8 34.Qxe6

(, 14.02.2010)

Feb-14-10  RandomVisitor: <jimfromprovidence>You have some interesting points, and I wish I had all the answers, but after 28...Kh8 29.Nxf7+ Kg8 30.f5 e5 <31.Nf4> we have

1: K Shantharam - Gregory Kaidanov, Gausdal 1991

click for larger view

Analysis by Rybka 3 :

1. (4.29): 31...exf4 32.Rxf4 Ne5

2. (4.81): 31...Qa7 32.Nh6+ Kh8 33.Nxd3 c4 34.Ng4 Bxa3 35.Rc2 Qe7 36.bxc4 Na5 37.Qh4 Nxc4 38.Qxf6+ Qxf6 39.Nxf6 Rf8 40.Nd7 e4 41.Nxf8 exd3 42.Rc3

Premium Chessgames Member
  Jimfromprovidence: <RV> Thanks. Now all we have to do is find out what the losing move was!
Premium Chessgames Member
  mistermac: Excellent compilation.
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