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Leonid Shamkovich vs David Blohm
American Open (1976), Santa Monica, CA USA
Spanish Game: Berlin Defense. Rio Gambit Accepted (C67)  ·  1-0

ANALYSIS [x]

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< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jul-31-11  morfishine: <sevenseaman> Kind of fitting that after <22...Kxe7> ...<e7> turns out to be his only safe square for awhile, until he's finished off.

My favorite miss-step is if after 25.Nd5+ <25...Kd8???> 26.Rg8+

Good luck next week working the POTD and good to see you signed-on for the Akobian game. :) Morf

Jul-31-11  morfishine: <David2009> Thanks for setting up "Crafty" (plus on other occasions). "Crafty is an understatement".

What I find strange [when you present a position with colors reversed], is at times I am more confused, while others, it makes it much simpler to see the solution.

Jul-31-11  scormus: <morfishine: ... One thing I was wondering (after seeing the continuation) is this: Is <24.Nxc7+> even necessary?...Why not <24.Nf4+> going straight for the throat?>

Good call! I was wondering that too but I hadnt really thought it through.

<sevenseaman> also a good point about W seeing what B would do in reply to <Nxc7+> I even wonderd if W had seen something in the Nf4+ line that required Nxc7 first, but I have yet to see what it was.

I simply must see what Rybka says. It might not be the toughest Sunday POTD but it raises some very interesting discussion.

Jul-31-11  Creg: I think 22.Rxe7+ is the key move, but after...

22...Kxe7 23.Nd5+ Ke6 is giving me troubles. All other King moves appear good for white. After...

24.Nxc7+ Ke7 I don't see how white makes headway as he's still down two pieces. Unless he plans on using his kingside pawns, say after...

25.Qxh8 Bxh8 26.Nxa8, white has 3 pawns for the piece?!

I must be missing something. Let's see what I'm missing.

-------
I never thought of Nf4+.

Jul-31-11
Premium Chessgames Member
  Jimfromprovidence: <morfishine> <One thing I was wondering (after seeing the continuation) is this: Is <24.Nxc7+> even necessary?...Why not <24.Nf4+> going straight for the throat?>

The reason white plays 24 Nxc7 first is to rid the knight's protection by that pawn.

This proves cruical in the variation if black deviates from the text with 26...Kf7.


click for larger view

White wins now after 27 Qg6+ Kf8 (or Ke7) 28 Qd3!


click for larger view

White has two threats, 29 Qxd6+ and Ng6+. Only one is stoppable, because of the now unprotected knight.

Jul-31-11
Premium Chessgames Member
  al wazir: <TheBish>: According to Benjamin Franklin (in Poor Richard's Almanack), "Three removes are worse than a fire."
Jul-31-11
Premium Chessgames Member
  al wazir: <Jimfromprovidence: The reason white plays 24 Nxc7 first is to rid the knight's protection by that pawn.> Thanks.
Jul-31-11  DrMAL: Guess I was impatient, I just jumped to 24.Qxh8! also winning (checked to be sure). 24.Nxc7! was even stronger.
Jul-31-11  noendgame: Well, I got some of the moves, pretty good for me on a Sunday. I didn't anticipate black'e attack on the queen or the sweet little 28 D4, cutting off the escape.
Jul-31-11  VincentL: "Insane".

The only feasible move I see is 22. Rxe7+

Now black cannot play 22......Bxe7 on account of 23. Qxh8.

So 22....Kxe7, then 23. Nd5+.

(a) 23....Kd8 24. Rg8+ ! Qxg8 25. Qxf6+ Ke8 26. Qe7 mate.

(b) 23....Ke8 24. Nxf6+ followed by 25. Qxh8

(c) 23....Kf7 24. Qg6+ Kf6 25. Rf6 Qg7 26. Rxf6+ Kg8 27. Ne7+ Kh8 28. Qh5+ Qh7 29 Rf8+ Kg7 30. Rf7+ h8 31. Qxh7 mate.

Other black moves lead to a similar end.

(d) 23....Ke6 24. Nxc7+ Ke7 (if Ke5 black will get mated by the rook and pawns) 25. Re3+

Here I donīt quite see the finish, and I am out of time.

Letīs check.

Jul-31-11  scormus: <Jimfromprovidence: ....The reason white plays 24 Nxc7 first is to rid the knight's protection by that pawn.>

Thanks. Well found!

Jul-31-11
Premium Chessgames Member
  agb2002: White has a rook and three pawns for the bishop pair and a knight.

Black threatens 22... Qxh6 and 22... Ndf5.

The bishop on f6 protects the black queen and the knight on e7 covers the squares d5 and g6. This suggests 22.Rxe7+, eliminating a defender and incorporating the knight into the attack with tempo, 22... Kxe7 (22... Bxf6 23.Qxh8) 23.Nd5+:

A) 23... Kd8 24.Rg8+ Ne8 (24... Qxg8 25.Qxg6+ Ke8 26.Qe7# or 26.Nxc7#) 25.Rxh8 Bxh8 26.Qxh8 + - [Q+3P vs R+B].

B) 23... Ke8 24.Nxf6+ Qxf6 (else 25.Qxh8) 25.Qxf6 and 26.Rg8#.

C) 23... Kf7 24.Qg6+

C.1) 24... Kf8 25.Nxf6 (threatens 26.Nh7+ Ke7 27.Re3+ Kd8 28.Qg5+) 25... Nf7 (25... Ne4 26.Qe8#) 26.Nh7+ Ke7 27.Re3+

C.1.a) 27... Kd8 28.c3 (28.Qxf7 Qa1+ and mate next) 28... c6 (28... Nd6 29.Qg5+ and mate next) 29.Qxf7 + - [N+3P vs B].

C.1.b) 27... Ne5 28.d4 d6 29.dxe5 dxe5 30.Ng5 + - [N+2P vs B].

C.2) 24... Ke6 25.Nxf6

C.2.a) 25... Qxf6 26.Re3+ Kd5 (26... Ne4 27.Rxe4+ Kd5 28.c4+ and 29.Qxf6 + - [Q+3P vs B]) 27.Qxf6 + - [Q+3P vs B+N].

C.2.b) 25... Nf7 26.Re3+ Ne5 (26... Kd6 27.Qxf7) 27.Ng4+ Kd5 28.Rxe4+ wins.

D) 23... Ke6 24.Nxc7+

D.1) 24... Ke5 25.d4+

D.1.a) 25... Kxd4 26.Qe3#.

D.1.b) 25... Ke4 26.Rg4+ Kf5 27.Qf4#.

D.1.c) 25... Kf5 26.Rf3+ and mate next.

D.2) 24... Kf5 25.Rf3+ and mate next.

D.3) 24... Ke7 25.Qxh8 Bxh8 26.Nxa8 Ne8 (26... Kd8 27.Rg8+; 26... Nb5 27.a4; 26... Be5 27.Re3 Kf6 28.Nc7) 27.Nc7 Nxc7 28.Rg8 + - [R+4P vs B+N].

D.4) 24... Kf7 25.Qg6+

D.4.a) 25... Ke7 26.Nd5+ Ke6 27.Nxf6 is similar to C.2.

D.4.b) 25... Kf8 26.Nxa8 + - [R+4P vs 2B].

Jul-31-11
Premium Chessgames Member
  Jimfromprovidence: In my earlier post I should have continued a bit longer with that variation because there's another nice twist to that position.

Again, here's the position after 26...Kf7 27 Qg6+ Kf8 (or Ke7) 28 Qd3!


click for larger view

Now, after 28...Ke8 29 Qxd6, black pulls out this rabbit, 29...Be7?!, threatening mate in one and white's queen.


click for larger view

Luckily white has 30 Qxe7+, and wins after 30...Kxe7 31 Ng6+.

Jul-31-11  Patriot: Time limit: 20 minutes with chess clock

Material: Black has 3 pieces for a rook and 3 pawns

Threats: 22...Qxh6

My only candidate was 22.Rxe7+ in the entire 20 minutes. With black's rook and c8-bishop out of the game and the fact that black is slightly ahead materially, white must "strike while the iron is hot".

22...Kxe7 is forced since 22...Bxe7 23.Qxh8.

23.Nd5+ brings another piece into the attack.

23...Kf7 allows 24.Qg6+ Ke6 and I wasn't completely certain how to continue. 25.Nxc7+ is possible or 25.Nf4+ or even 25.c4. Here I thought 23...Ke6 right away is probably the best defense. 24.Nxc7+ is again possible or 24.Nf4+ Kf7 (marching forward looks suicidal) 25.Qg6+ Kf8 26.Nd5 looks murderous. That's about all I could see in the time spent on this.

Jul-31-11  castledweller: I got the first few moves correct and feel like I want to take credit for this one - but I didn't work it through to the end.

Usually, after doing alot of physical exercise, I can sit down here at the computer and my brain (not my body) is ready to rock. But today, I think I overdid it in the heat - and feel closer to passing out than to playing well. I am a little surprised I was able to get this far along on an "insane" level puzzle, given how my head aches. Seems easier than usual for sunday, no?

Jul-31-11  morfishine: <Jimfromprovidence> Beautiful, thanks! The strength of white's knight going to <f4> is perfectly substantiated in all variations.

In essence, black missed a continuation (namely <25.Kf8>) that merely prolongs the inevitable, which is the recommended line by 'Crafty' (Thanks <David2009>)

Jul-31-11  scormus: <Jim> again, well spotted on that cute counterpunch and counter-counterpunch.

I have to applaud Shamkovich, to see the strength of the Nd5-c7-Nd5-f4 sequence instead of harvesting his material gain by grabbing the Ra8. And I like to think he saw it through to Jim's last little wrinkle. Even though B made it easier for him by exposing his K, it was a brilliant combo.

Jul-31-11  patzer2: In attempt to solve today's Sunday puzzle, I got
<22. ♖xe7+!! ♔xe7 23. ♘d5+ ♔e6>

If 23... Kf7, then 24. Qg6+ Ke6 25. Nxf6 Qxf6 (25... Nf7 26. Re3+ Ne5 27. Ng4+ Kd5 28. Qe4+ Kd6 29. Nxe5 ) 26. Re3+ Ne4 27. Rxe4+ Kd6 28. Qxf6+ leads to mate.

and even found <24. ♘xc7+ ♔e7>

However at this point, not seeing anything more clear, I went for the simple 25. Qxh8 Bxh8 26. Nxa8 b6 27. Nc7 .

What I missed was the decisive pursuit combination from the game with 25. Nd5+!:

< 25. ♘d5+! ♔e6 26. ♘f4+! ♔f5>

If 26... Ke5 27. Ng6+ wins the Queen with the Knight fork.

If 26... Kf7, then 27. Qg6+ Ke7 28. Nd5+ Kd8 29. Qxf6+ Qxf6 30. Rg8+ Qf8 31. Rxf8+ Ne8 32. h4 a6 33. h5 a5 34. h6 Ra6 35. h7 Rh6 36. h8=Q Rxh8 37. Rxh8 wins easily.

<27. ♕g6+ ♔xf4>

If 27... Ke5, then White mates after 28. d4+ Kxd4 (28... Kxf4 29. Rf3#) 29. Qd3+ Kc5 30. Qd5+ Kb6 31. Qxd6+ Ka5 32. b4+ Ka4 33. Qd5 a5 34. Ra3+ Kxb4 35. Rb3+ Ka4 36. Qb5#.

<28. d4 ♗xd4 29. ♕g5+> 1-0

Black resigns instead of allowing 29...Ke4 30. Rg4#.

Jul-31-11  DarthStapler: I got the first three moves
Jul-31-11  swr: I think it's fair to say I got this one, seeing the first two moves straight away and working out the rest move-by-move. Nice puzzle.
Jul-31-11  CHESSTTCAMPS: White has R+3 pawns for 2Bs+N, a significant material deficit, in exchange for excellent chances against the exposed black king. Black's lag in development is a big factor in the positional assessment, with the undeveloped rook contributing to back-rank weakness and the undeveloped bishop allowing light square weakness near the king. The possibility of removing a defender while bringing the white knight into the attack with tempo quickly suggests the best move:

22.Rxe7+! (makes g6 available to the WQ and further exposes the BK) Kxd7 (Bxe7? 23.Qxh8) 23.Nd5+ and the BK is on the run:

A) 23... Ke8? 24.Nxf6+ wins the Q.

B) 23... Kd8? 24.Rg8+! Qxg8 25.Qxf6+ forces mate.

C) 23... Kf7? 24.Qg6+ Ke6 25.Nxf6! Nf5 (to stop 26.Re3+) 26.Ng8+ Ke5 27.Rg5 wins

C.1) 24... Kf8 25.Nxf6 and black is helpless against the threats of Re3 (+) abd Nh7+ e.g. 25... Nf7 (or c6) 26.Re3 followed by 27.Nh7+ wins the Q.

C.2) 25... Qxf6 26.Re3+ wins.

D) 23... Ke6 (best) 24.Nxc7+ Ke7 25.Qe3+ Kd8 26.Nxa8 b6 27.Nxb6 ab 28.Qxb6+ Ke7 29.Re3+ Kf7 30.Qxd6 and white has rook + 6 pawns for 2 Bs.

In line D, I also looked at 24.Nf4+ Kf7 (Ke5/e7? 25.Ng6+) 25.Qg6+ Kf8 26.Nh5 Be5, but couldn't find a clear win.

Time for review ...

Jul-31-11  CHESSTTCAMPS: I was very close to the game finish in analysis that I didn't specify in my post, but missed the importance of the Nxc7+ interpolation. Nice trap by Crafty EGT with the Qa1# possibility.
Jul-31-11  stst: Give two lines:
(I)
22.RxN+ KxR
23.Nd5+ Kd8
24.Rg8+ QxR
25.QxB+ Ke8
26.Qe7#

(II)
22.RxN+ BxR
23.Qg6+ Kf8
24.Rf3+ Bf6
25.RxB+ Ke7
26.Nd5+ Kd8
27.Qg5, and BQ will be lost on releasing the R for dis+.

(More variations possible...)

Jul-31-11  sevenseaman: <stst> In your variation (II), after 22...BxR 23. Qxh8 is better and facilitates the win later.

As I foresaw in my first comment, it has been a thoroughly enjoyable Sunday puzzle - truly a feast.

Aug-02-11  gofer: I saw the main line, < 22 Rxe7+ Kxe7 23 Nd5+ Ke6 24 Nxc7+ ...>. But it has taken me two more days to be Crafty EGT! This was by no means an easy win. White has to be clinical in the way that it contains the black queen in the h8 corner, because as soon as she's let loose white is in trouble!

24 ... Kf7
25 Qg6+ Kf8
26 Rf3 Ke7
27 Nd5+ Kd8
28 Nxf6 Ne8!
29 Qg5 Qg7
30 Qh4 Nxf6
31 Rxf6 Kc7
32 Qf4+ Kd8

Now the 4 pawn advantage can start to come to white's advantage.

33 d4 b6
34 c4 Bb7
35 g4 Rc8
36 g5 b5
37 h4 bxc4
38 bxc4 Rc5
39 d6 Ra5
40 Qe3+ Kd8
41 a3 Bc6
42 f4 Kc8

At last! Black succumbs to the pawn on-slaught! With no where to go and white's kingside pawns marching up the board the black king tries to run to safety!

43 Qe7! Qxe7
44 dxe7 d6

Black has to jetison material to survive. There are many ways to win here are two...

Win 1:

45 Rxd6 Bd7
46 Rd5 Rxd5
47 cxd5 Be8
48 f5 Kd7
49 Kf2 Kxe7
50 Ke3 Bf7
51 g6 Bxd5
52 Kd4 Bf3
53 Ke5 Kf8
54 f6 Bh5
55 Kf5 Bf3
56 Kg5 Ke8
57 h5 winning

Win 2:

45 Rf8+ Kc7
46 e8=Q Bxe8
47 Rxe8 Kd7
48 Re4 Rxa3
49 Kg2 Ra2+
50 Kg3 Ra3+
51 Kg4 Ra1
52 h5 Rg1+
53 Kf5 Rh1
54 h6 a5
55 Kg6 a4
56 Re3 winning as Ph6 will promote and Pa4 wont

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