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Alexei Olegovich Gavrilov vs Boris Grachev
Russian Championship Higher League (2007), Krasnoyarsk RUS, rd 2, Sep-04
Semi-Slav Defense: Meran Variation (D47)  ·  0-1
ANALYSIS [x]

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sac: 35...Nd2 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jul-19-17  Walter Glattke: 36.Ba6 Qf3+ 37.Kh3 Qh1+ 38.Kg4 f5+
39.Kh5 Qf3+ 40.Kg6 Qg4#
35.-Nd2 allows Qxf2, 36.Qxd2 Bxd2 37.Bxd2 Qxd2 wins.
Jul-19-17  Walter Glattke: 35.-Ne1+ 36.Kh2 Qf1 37.Bxe1
Jul-19-17
Premium Chessgames Member
  al wazir: I opted for 35. Ne1+ too. In all the variations I checked (there are a lot of them), black either mates or wins the ♕.
Jul-19-17
Premium Chessgames Member
  Jimfromprovidence: 35...Ne1+ 36 Kh2 (only move that does not lead to mate) 36...Bd2!


click for larger view

A lot to look at from here.

Jul-19-17
Premium Chessgames Member
  radtop: Doesn't 33 Qb2 Nd2 win?
Jul-19-17  AlicesKnight: I found the game continuation ....Nd2 and the drive of the K into the mating-net after a short time. <Jimfromprovidence> shows ...Ne1+ is less sound.
Jul-19-17  BxChess: <Jimfromprovidence> 35...Ne1+ 36 Kh2 Bd2
Maybe 37 Bb7 staves off the threat of ...Qf1-Qg2#
Jul-19-17  Walter Glattke: Providence diagram: 37.Bd4 Qf1 38.Qb7 / 37.-Nf3+ 38.Kg2 Ne1+ perpetual possible
Jul-19-17  saturn2: I went with the interposition 35 ..Nd2 which attacks the square f2 decisively.
Jul-19-17
Premium Chessgames Member
  rodchuck: How about 35....Ne1+ 36. Kh2 Nc2?
Jul-19-17  eaglewing: And how to continue following 35....Nd2 36. Bb7?
Jul-19-17
Premium Chessgames Member
  Once: In human mode I went for 35...Nd2 when white can't defend f2. It seemed the most straightforward to me.

Seeing the discussion of 35...Ne1+, I turned Fritz on (he quite likes that). He says that 35...Ne1+ also works. Jim's line of 35...Ne1+ 36. Kh2 Bd2 puts up the most resistance for white. Black ought to win, but it's a little more complicated.

One possible line might be 37. Kg1 Qf3 38. Bb7


click for larger view

Defends against the mate on g2, but now white will switch strategies and win a piece with 38...Qxc3.

So I'd say that today has more than one solution. 35...Nd2 or Ne1+ both seem to work. I still prefer 35...Nd2 as it leads to fewer complications, but a win is a win is a win.

Jul-19-17  borabc: This was so easy. Took 15 sec to solve ( I'm 1250 FIDE but underrated )
Jul-19-17
Premium Chessgames Member
  gofer: This one took a while, after seeing that <35 ... Ne1+ 36 Kh2> was going nowhere fast, I then looked at either Bd2 or Nd2, eventually deciding on the latter. But after that its still not completely plain sailing...

<35 ... Nd2>

36 Qxd2 Bxd2

36 Kh3!? Qf1+
37 Kg4 f5+! (Kh2 Nf3#)
38 Kh5 Qe2+
39 f3 Qxf3+ (Kg6 Qg4#)
34 g4 Qxg4+ (Kg6 Qg4#)

<36 Bxd2 Qxf2>

<37 Kh3 Qf1+> (Kh1 Qg1#)

<38 Kh2 Bg1+> (Kg4 Qf5#)

<39 Kh1 Bf2+>

<40 Kh2 Qg1+>

<41 Kh3 Qxg3#>

So a "simple" mate in 7, but not that simple really...

~~~

Hmmm, <35 ... Ne1+> is playable! Both Boris and I missed that but it looks far more complicated than <35 ... Nd2>.

Jul-19-17  newzild: On 33...Ne1+ 34. Kh2, Black also has the simple 34...Qxb2 35. Bxb2 Bxf2, when he is effectively two pawns up.
Jul-19-17  saturn2: <newzild> It is 4 vs 5 pawns after your move 35
Jul-19-17
Premium Chessgames Member
  malt: Not easy, looked at 35...Ne1+ 36.Kh2 Bd2 37.Kg1 (37.Q:d2 Nf3+)...Qf3 38.Bb7 35...Nd2 36.B:d2 Q:f2+
Jul-19-17
Premium Chessgames Member
  whiteshark: Had <35...Nd2 36.Bxd2 Qxf2+ 37.Kh3 Qf1+ 38.Kh2 Bg1+ 39.Kh1 Bf2+ 40.Kh2 Qg1+ 41.Kh3 Qxg3#> Well, a few of you explained it a bit more detailed.
Jul-19-17
Premium Chessgames Member
  Sally Simpson:


click for larger view

I went for 35...Ne1+ 36. Kh2 Nc2 which looks like it wins. Though the way I've been playing lately I could lose this as Black.

Hi Cheshire Cat.

Is your line 35..Ne1+ 36.Kh2 Qf1. Yes 37.fxe3 gets mated (I was poking around there myself) but 37.Bxe1 looks good for White.

Hi Saturn, he said 'effectively' probably counting the double a pawns as one.

Jul-19-17
Premium Chessgames Member
  Jimfromprovidence: With 35...Nc1 36 Kh2 Bd2 we find out first that the bishop is untouchable.


click for larger view

If 37 Qxd2 then 37...Nf3+

If 37 Bxd2 then 37...Qxf2+ with mate in two moves.

Now, if white moves the king as in 37 Kg1, then black wins a piece after 37...Qf3, (threatening mate in one) 38 Bb7 Bxc3.


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A pretty, but detailed line begins after 37 Bb7 for those interested.


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Jul-19-17  YetAnotherAmateur: <Once> From your diagrammed position, it seems to me like 38. ... Bxc3 might be better than 38. ... Qxc3: Trading down isn't really an option, because it leaves white with a B v B+N and doubled queenside pawns vs kingside majority.
Jul-19-17  BOSTER: From one side is Heisman's check the <check>. So 35...Ne1+. From other side is very interesting the idea to intersect the line b2-f2 with 35...Nd2,using the same idea like in famous game Reti vs Bogoljubov. Really I'd play Ne1.
Jul-19-17
Premium Chessgames Member
  agb2002: Black has a bishop and a knight for the bishop pair.

White threatens Qxe2 and Bxg7.

Black can resume the attack with 35... Nd2 and 35... Ne1+.

In the case of 35... Nd2:

A) 36.Bxg7 Qxf2+ 37.Kh3 (37.Kh1 Qg1#) 37... Qf1+ 38.Kh2 (38.Kg4 Qf5#) 38... Nf3#.

B) 36.Bxd2 Qxf2+ 37.Kh3 Qf1+ 38.Kh2 (38.Kg4 Qf5#) 38... Bg1+ 39.Kh1 Bf2+ 40.Kh2 Qg1+ 41.Kh3 Qxg3#.

C) 36.Qa1 Qxf2+ 37.Kh3 (37.Kh1 Nf3 wins) 37... Nf1 38.Qe1 Qf5+ 39.Kg2 (39.g4 Qf3+ 40.Qg3 Qxg3#) 39... Qe4+ 40.Kh3 (40.Kxf1 Qf3+ 41.Qf2 Qxf2#) 40... Qh1+ 41.Kg4 h5+ 42.Kxh5 Qf3+ 43.g4 g6#.

D) 36.Qc1 Qxf2+ as in C.

E) 36.Bxe6 Qf1+ 37.Kh2 Nf3#.

F) 36.Bb7 Qf1+ 37.Kh2 Bxf2

F.1) 38.Be5 Bg1+ 39.Kh1 Bd4+ wins.

F.2) 38.Bg2 Qg1+ 39.Kh3 Nf1 40.Qb7 (40.Bxf1 Qxg3#) 40... Qh2+ and mate in two.

G) 36.Ba3 (to control f1) 36... Qxf2+ 37.Kh3 Qf5+

G.1) 38.g4 Qf3+ 39.Kh2 Bf4+ 40.Kg1 Qg3+ 41.Kh1 Qh2#.

G.2) 38.Kg2 Qf3+ 39.Kh2 (39.Kh3 Qh1+ as in C) 39... Nf1+ 40.Bxf1 Qxf1 41.Qg2 (41.Be5 Bg1+ as in F.1) 41... Qxg2+ 42.Kxg2 h5 with virtually two extra pawns.

G.3) 38.Kh2 Nf3+ 39.Kg2 Qe4 with an extra pawn and the better position (40.Bd3 Ne1+ wins a piece).

H) 36.Qb7 Qf1+ 37.Kh2 Qxf2+ looks good for Black. For example, 38.Qg2 Nf1+ 39.Kh3 Qf5+ 40.g4 Qd3 41.Qf3 Qxc3 42.Qxf1 Qxc1.

I) 36.Qb5 Qxf2+ 37.Kh3 Nf1 looks winning.

-----

In the case of 35... Ne1+:

A) 36.Bxe1 Qxb2 - + [q vs B].

B) 36.Kg1 Bxf2+ 37.Kh2 (37.Kh1 Qf1+ 38.Kh2 Qg2#) 37... Qf1 38.B(Q)b7 Qg1+ 39.Kh3 Qxg3#.

C) 36.Kh1 Qf1+ 37.Kh2 Qg2#.

D) 36.Kh2 Bd2 (blocks the white queen's control on f2; 36... Qf1 37.Bxe1 + -; 36... Qxf2+ 37.Qxf2 Bxf2 38.Ba3 Nf3+ 39.Kg2 Bd4 40.Kxf3 Bxc3 looks very slow in the best case)

D.1) 37.Bxd2 Qxf2+ 38.Kh3 Qf1+ 39.Kg4 (39.Kh2 Qg2#) 39... Qf5#.

D.2) 37.Qxd2 Nf3+ and 38... Nxd2 wins.

D.3) 37.Bd4 Qe4

D.3.a) 38.Bb7 Nf3+ followed by 39... Qxd4 seems to win a piece (40.Qxd4 Nxd4; 40.Bxf3 Qxb2).

D.3.b) 38.Qb7 Qxd4 wins a piece.

D.3.c) 38.f3 Nxf3+ wins a piece and a pawn at least.

E) 36.Kh3 Qf1+ 37.Kg4 h5+ 38.Kxh5 g6+ 39.Kg4 f5#.

-----

35... Ne1+ is probably simpler and more effective than 35... Nd2.

Jul-20-17
Premium Chessgames Member
  patzer2: I missed the neat 35...Nd2! obstruction tactic solution to today's Wednesday puzzle, which after 36. Bxd2 leads to mate-in-six with 36...Qxf2+ .

Instead of 35...Nd2!, which is clearly the strongest winning move, I opted instead for 35...Qxb2 36. Bxb2 Ne1+ 37. Kf1 Bxf2 (diagram below)


click for larger view

where I anticipated 38. Kxf2? Nd3+ 38. Kxf2 Nd3+ to (-1.81 @ 31 depth, Stockfish 8) with excellent winning endgame chances for Black.

What I overlooked in the above position is the strong reply 38. Bc3!, where play might go 38. Bc3! Nd3 39. Ke2 Nc5 40. Be5 Be1 (-0.51 @ 31 depth, Deep Fritz 15) with Black having a slight edge but the outcome remaining in doubt.

P.S.: White's decisive mistake appears to be 27. Rc8?, allowing 27...Rxc8 (-1.57 @ 32 depth, Stockfish 8.)

Instead, White can hold it level with 27. Bb2 when play might go 27.Bb7 Bxe3 28.Bc3 Bd4 29.Bxd4 Rxd4 30.Qc3 a5 31.Re1 Qd6 32.Qxa5 Nh3+ 33.Kg2 Nxf2 34.Qa8+ Kh7 35.Kxf2 Rd2+ 36.Re2 Qd4+ 37.Kf1 Qa1+ 38.Kf2 Qd4+ = (0.00 @ 55 depth, Stockfish 8.)

Jul-26-17  newzild: <saturn2: <newzild> It is 4 vs 5 pawns after your move 35>

It's effectively a two pawn advantage, because of the doubled pawns on the a-file.

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