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Fedor Parfenovich Bohatirchuk vs Vladimir Nenarokov
USSR Championship (1924), Moscow URS, rd 9, Sep-??
Sicilian Defense: Four Knights. Exchange Variation (B45)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Feb-25-15  ozu: The fork at the beginning forces PxN. The rook on the g file forces Kh7. Rh5 forces Qd1+. Kh2 forces Qxh5. After QxQ, I felt like I did my job. I'll give it to myself, I guess. Extremely well played by white. All best moves, I think.
Feb-25-15  Edeltalent: 32.? White to play

Every piece of White is better than the corresponding black one, plus White is a pawn up. After 32.Nf6+ gxf6 33.Rg3+ Kh7 34.Rh5 Qd2, either 35.f4 or 35.Qxf6 Rg8 36.Rxg8 Kxg8 37.Rxh6 wins, as Black has to give up the queen in both cases.

Feb-25-15  ozu: Interestingly, the fork at the beginning of the puzzle isn't the first time that black's queen is threatened or attacked. This game is a little catalog on how to go after your opponent's queen.
Feb-25-15  ozu: ..or maybe, how to put your queen in harm's way! HA
Feb-25-15  diagonalley: excellent puzzle, though i missed the desperation defence 34.... Q-Q7 (thanks to <phony benoni>)
Feb-25-15  gofer: <32 Nf6+ ...>

32 ... Kf8/Kh8
33 Nxd7

<32 ... gxf6>

At this point there are probably lots of ways to win
but white needs to be a little careful.

33 Qxh6 Rxc3 doesn't seem to work

33 Rxc8+ Nxc8
34 Qxf6/Qxh6 doesn't seem to do much

<33 Rg3+ Kh7>

Again white needs to be careful, only accurate moves will force a win without black getting a chance to do anything about it...

34 Qe4+ leads nowhere

35 Qxf6 Rg8
36 Rxg8 Kxg8
37 Qxh6 f6
38 Qg6+ Kf8
39 Qxf6+ Qf7
40 Qxb6 is a win but its a little slow and painful

<34 Rh5 Qd1+>
<35 Kh2 ...>

Black cannot protect Ph6

35 ... Qc1/Qd2 36 f4! mating

<36 ... Qxh5>
<37 Qxh5 Rg8>
<37 Rxg8 Rxg8>
<38 Qc5 Rb7>
<39 Qc6 Rb8>
<40 Qc7 >

So no slam-dunk, but a clear win...

~~~

Nice one... ...all the moves!!! Now that is a little unusual...

Feb-25-15  morfishine: 32.Nf6+ gxf6 33.Rg3+ Kh7 34.Rh5

Here, I figured Black is forced to play 34...Qd2 (also mentioned by <Phony Benoni> & others); but White has the quiet killer <35.f4> & h6 cannot be defended


click for larger view

*****

Feb-25-15  zb2cr: Found this one after some thought.
Feb-25-15
Premium Chessgames Member
  Once: An interesting little puzzle. The first two moves are fairly obvious:

32. Nf6+ gxf6 33. Rg3+ Kh7 bringing us to here:


click for larger view

Now all of us so far (including me) have finished off with the game continuation of 34. Rh5. But Fritzie finds two alternative ways to win - 34. Qxf6 and 34 Qe4+. I suppose 34. Rh5 is more "visual" because it contains a clearer threat.

The last move of the game is fun - 38. Qc5.


click for larger view

A rook and a knight might be able to hold out against a queen if they can build a fortress. But here they can't protect each other. 38...Rb7 39. Qc6 Rb8 40. Qc7


click for larger view

Two rooks or two knights could protect each other because they move in the same way as each other. But a rook and a knight can't set up a mutual protection society. One can protect the other, but it can't be reciprocated.

Feb-25-15  CHESSTTCAMPS: White is up a pawn and is actively deployed for attack against a poorly defended king (lateral defense by Ra7 and Q is the only option). The position of black K&Q suggests the royal fork as a means to open up the castled position:

32.Nf6+! - wins quickly - gxf6 33.Rg3+ Kh7 (otherwise 34.Qxh6#) 34.Rh5 and now:

A. 34... Rc1+ 35.Kh2 Qd2 36.f4 and black can only delay Rxh6# by spite checks

B. 34... Qd1+ 35.Ka2 Qxh5 36.Qxh5 Rg8 (otherwise 37.Qg4 forces mate) 37.Qf5+ Kh8 38.Qf6+ followed by Qxb6 wins.

C. 34... Qd2 35.f4 can transpose to A.

Feb-25-15  CHESSTTCAMPS: Overlooked 37... Rg6 after 37.Qf5+(?).
Feb-25-15  lost in space: This puzzle took me much longer than usaual on a Wednesday.

First I checked (for ages) the sequence 32. Qxh6 gxh6 33. Nf6+ with royal fork. Not woking as the black queen is protected/defended by the knight. So my question was how to remove the defender? But even if this would be possible, the combination doesn't win enogh material for a decisisive advantage.

So after quite a while I found the solution...but had to think again for a while how to win the game after 37...Kxg8.

To find 38. Qc5 and the motiv described by <onces> was hard to spot for me:

<Two rooks or two knights could protect each other because they move in the same way as each other. But a rook and a knight can't set up a mutual protection society. One can protect the other, but it can't be reciprocated.>

Feb-25-15  alshatranji: I thought of 33.Qxh3. But now I can see that after 33...Rxc3, 34.Rh5, Black plays 34...Qd1, then Qxh5, as in the actual game, except now White's queen is playing against three pieces. Not so good.
Feb-25-15
Premium Chessgames Member
  Penguincw: When I saw the puzzle, I saw 2 overloaded pieces: the pawn on g7 and black knight. The combination I was hoping for was 32.Qxh6+ gxh6 33.Nf6+ Kg7 34.Nxd7 Nxd7 35.Rxc8 Nxd7, and black has a knight for 2 pawns.

However, 32...Qd1+, and white is done.

Feb-25-15  Marmot PFL: 32 Nf6 gf6 33 Rg3 Kh7 34 Qxf6 Rg8 35 Rxg8 Kxg8 36 Qxh6 and Rg5+ looks like a win.
Feb-25-15
Premium Chessgames Member
  Longview: I saw the breakthrough to the King after I finished analyzing the treats Black was building on the Queenside. I did not anticipate the 33. Kh7 response. I saw a path to mate when the Black King moved the other way.

Upon seeing that position develop, however, contrary to <Once>, the first two moves I saw were Qxf6 and Qe4+. Interestingly, both positions end up [per Houdini] where the game went with Qc5 - eliminating the Knight from the equation. The difference was that with the game, two more black kingside pawns remain on the board. Not that in the end they would move or be a threat.

Feb-25-15  houtenton: <ozu> thank you for the name of Grotte Chauvet Pont d'Arc. You scored at least one point with your posting. I'm certainly going to see the movie "Cave of forgotten dreams" because you cannot visit the cave itself.
Feb-25-15
Premium Chessgames Member
  AvidChessMan: 32. Nf6 - a knight sac that exposes the black king - looked like the best move to me, but not a mating move. I didn't foresee the black queen's check and sac move. This seemed like it was in desperation, as white ended up with a material advantage. Nice overall knight play and forking by white!
Feb-25-15  patzer2: Here's my look at the game and today's Wednesday puzzle (32. ?) with Fritz 12:

<17...Qd8?> Black misses the opportunity to secure an advantage.

Instead, 17... Nf6! gives Black the better of it after 17...Nf6! 18. Qh4 dxe4 19. Bxe4 Rad8 .

<18. Rg3!> Now White grabs the initiative and never lets up.

<18...Qf6 19. Re1 e5?> This is not an obvious error but it enables White to secure a significant advantage.

Better is 19...Qf4 then White gets only a small edge after 20. e5! Qd2 21. Kf1! Kh8 22. Qg4! Rg8 23. Rf3 Rgf8 24. Bb1 Ra8 .

<20. cxd5 cxd5 21. Bb5! Nb6?> This might be the decisive error.

Instead, Black can put up much more resistance with practical drawing chances in a pawn down endgame after 21... Rad8! 22. Bxd7 Rxd7 23. Nc5 Rc7 24. Nxb7 Rxb7 25. exd5 when play might continue 25...Rc8 26. h3 Rc2 27. Re2 Rxe2 28. Qxe2 Rd7 29. Rc3 Rxd5 30. Rc8+ Rd8 31. Rxd8+ Qxd8 32. Qxe5 a5 33. a3 to .

<22. Nc5!> This move secures a winning advantage after <22...a6 23. Bd3 dxe4 24. Bxe4 Bxe4 25. Nxe4 Qe6 26. Nc5 Qf6 27. Rxe5 Rfd8 28. h3 Ra7 29. Ne4 Qc6?>

Black puts up more resistance with 29... Qf4, but White secures a winning edge after 30. Nc3! g6 31. Qe2 Rd2 32. Qe1! Rc2 33. Ree3 Rd7 34. Rgf3 Qc7 35. Re8+ .

<30. Qh4!!> This strong move sets up our Wednesday puzzle position after <30...Rc8 31. Rc3 Qd7 32. Nf6+!>

I picked 32. Nf6+! as my Wednesday solution, but with a different follow-up in mind.

<30...gxf6 33. Rg3+>

Not 33. Qxf6?? when White tosses the win and is in danger of losing after 33..Rxc3 34. Qxh6 Rc6 35. Rg5+ Rg6 36. Rxg6+ fxg6 37. Qxg6+ Qg7 38. Qxb6 Rc7! 39. Qe6+ (39. Qxa6?? Rc1+ 40. Kh2 Qe5+ 41. g3 Qe4 ) 39... Qf7 40. Qg4+ Kf8 to .

<33... Kh7 34. Rh5> This wins easy but it's not the only solution.

My planned follow-up was 34. Qxf6! which wins after 34...Rg8 35. Rxg8! Kxg8 36. Qxh6! Qb5

[36... f6 37. Qg6+ Qg7??

(37... Kf8 38. Qxf6+ Qf7 39. Qh8+ Qg8 40. Re8+ Kxe8 41. Qxg8+ Ke7 42. Qh7+ Kd6 43. Qxa7 ;

37... Kh8 38. Rh5+ Qh7 39. Rxh7+ Rxh7 40. Qxf6+ Kg8 41. Qxb6 )

38. Re8#]

37. Rxb5 axb5 38. Qxb6 Rxa2 39. Qxb5 .

<34... Qd1+ 35. Kh2 Qxh5 36. Qxh5 Rg8>

If 36... Rc6, then 37. Qg4 Ra8 (or any other move) 38. Qg7#.

<37. Rxg8 Kxg8 38. Qc5 1-0>

Black resigns in lieu of 38...Rb7 (38... Nc8 39. Qxc8+ Kg7 40. Qg4+ Kf8 41. Qd4! ) 39. Qc6 Rb8 40. Qc7 .

Feb-25-15  patzer2: <nalinw: Isn't 34. Qxf6 better? My solution went 34. Qxf6 Rg8 35. Rh5> (diagram below)


click for larger view

After this Black turns the tables and snatches victory from the jaws of defeat with the double attack 35...Qd1+ 36. Kh2 Qxh5 .

Better after 34...Rg8 is 35. Rxg8! Kxg8 36. Qxh6 .

Perhaps from a human perspective, White's choice of 34. Rh5! was the most practical winning solution since it simplified the calculation and gave Black no chance at such a swindle.

Feb-25-15  starry2013: I eventually got this, not in the morning though, I needed to come back to it in the evening.

1. Rg3 2.Qd1+ Kh2 3.Kh8 Reg5 4.Rc1 Qxh6+ 5.gxh6 Rg8+ 6.Kh7 R3g7#

First I tried the direct Queen sacrifice, I wanted to keep that knight. Didn't find the moves for it so moved to knight sacrifice. Still didn't find it. The black queen is the biggest difficulty in the lines I looked at as the black rooks are largely out of play and obviously with less reach than the queen. I also thought of luring the black c rook away to weaken the back rank.

Turned out it was a queen sacrifice but that move had to be witheld for a while till the rooks were in position. I could also pin pawns with the king behind them which I didn't see till later.

My solution may not be the best but it was neat that I got mate just one move before my opponent did. I never ended using that knight that I was fond of earlier.

Feb-25-15  BOSTER: I was studying the pos. white to play 31.


click for larger view

With 31.Rc5.

Because the black queen should stay on the 6 rank protecting h6 pawn, and protecting the knight b6 in the case if white play Qxh6 with double threat Qxg7# and Qxb6.

In the reality the queen has only one retreat 31...Qe6.

After 32.Rxc8 Qxc8 33.Qxh6 and white win.

If 32.Nxc8 33.Nf6+ if Kh8 34.Qxh6+ gxh6 35.Rg8#.

But after 34...Kf8 35.Qb5+ and black has Qe7, or Ne7, or Re7. Only one of them is safe.

The Q. is should white count all this, or only one glance is enough to say that no <condition> for combo?

Feb-25-15  patzer2: <BOSTER> Good catch on 31. Rc5! as a winning alternative to the game move 31. Rc3! .

Also scoring the full point here is 31. Nf6+! when play might continue 31...Kh8 (31... Kf8 32. Qb4+ Qc5 33. Qxc5+ Rxc5 34. Re8#) 32. Rh5 Qc1+ 33. Kh2 Qc7 (33... Qd2 34. f4 Nd7 35. Rxh6+ gxh6 36. Qxh6#) 34. Rxh6+ gxh6 35. Qxh6#.

Feb-25-15  starry2013: Looking at replies I went against the grain but I got the checkmate against the computer in a few moves so I'm happy enough.
Feb-25-15  dfcx: The most forcing moves are 32. Rxc8+ and Nf6+. With Rxc8+ black can easily defend with Qxc8 or Nxc8. after 32.Nf6+

A. 32...gxf6 33. Rg3+ Kh7 (Kf8? 34.Qxh6#) 34. Rh5 Qd2 35.Qxf6 Rg8 36.Qxb6

B. 32...Kf8/Kh8 33.Nxe7

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