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Nisha Mohota vs Soumya Swaminathan
National Women A, Chennai (2011), ?, rd 7, Nov-05
Zukertort Opening: Symmetrical Variation (A04)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Mar-11-17  YouRang: Saturday 15.?


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Well, I correctly guessed that I wanted to move my Na3, and I did consider Nb5 and Nc4. However, I didn't see how to make Nb5 work so I went for <15.Nc4>


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White has a substantial lead in development, and no knights are about to be captured by a pawn.

Problem solved! ;-)

Mar-11-17  YouRang: Funny, when I looked at 15.Nb5 cxb5, I kept trying to find something more "clever" than 15.axb5.

It makes so much more sense after you see the solution...

Mar-11-17
Premium Chessgames Member
  ChemMac: <devere> If 17.Rfd1, then 17...Qe5

<chesshighercat> 16.ab Rb8 simply 17.Bf4 keeps the d7 Knight in place, and then 18 Rac1 is available 17...b6 doesn't help.

Mar-11-17  devere: <ChemMac: <devere> If 17.Rfd1, then 17...Qe5> then 18.Qc3 and White wins at least a rook.


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Mar-11-17
Premium Chessgames Member
  al wazir: I totally missed this. Didn't even consider attacking along the c-file.
Mar-11-17  AlicesKnight: I saw the principle of Nb5 and the Rs on the open files but got the sequence wrong (and missed Qa5).
Mar-11-17  WorstPlayerEver: Well, I went in a split second after 15. Nb5.

I am studying this game:
Korchnoi vs Karpov, 1974

However, I did not see 15...cb5 16. ab5 lol because one has to consider Bf4 too (attack on Rb8). While in the game I study Bf4 is a killer move! This is so embarrassing.

Mar-11-17  clement41: White is ahead in dev. and a pawn down, therefore she must look to harass black's king before he can safely castle. 15 Nb5! uses rightly the lack of back rank dev of black. Being forced to expose the king on d8 with an open d-file for white's rooks is already a serious concession.
Mar-11-17  mel gibson: I didn't see that.
The computer DR4 64 bit says:

15. Nb5 (15. Nb5 (♘a3-b5 ♔e8-d8 ♖a1-c1 f7-f6 ♘b5-d4 ♕e6-d6 ♖f1-d1) +2.53/18 118)

score +2.53 depth 18

Mar-11-17  gofer: Black has decided to delay castling and is going to pay heavily.

<15 Nb5 ...>

White threatens <16 Nc7+ Kd8 17 Nxe6+> i.e. winning the queen without losing tempo. So black's replies are very limited; Kd8, Qe5 and cxb5.

15 ... cxb5
16 axb5 Rb8 (Rxa1 Qxc8#)
17 Bf4 g6/f6 (Ne5 18 Qc7 Qd6 19 Bxe5 Qxc7 20 Bxc7 )

18 Bxb8 Nxb8
19 Ra8

15 ... Qd5
16 Bf4 b3
17 Qc1

<15 ... Kd8>

Positionally black is probably losing badly. So simple moves like Nd4, f5, Rfd1 are all going to be fine, but perhaps we can press further/faster?!

<16 Rac1 ...>

The knight is immune <16 ... cxb5 17 Qc7+ Ke8 18 Qxc8+ Rxc8 19 Rxc8#>. This all looks horrible for black. I can't guess the next few moves, but it all looks good for white!

~~~

OMG, how horrible it is! I got the first two moves, but missed the beautiful lines that were available if black doesn't play cxb5!

Mar-11-17  saturn2: I went for 15 Nb5. It threatens Nc7+ on the other hand 15..cxN 16 axb5 puts embarrasing questions on the rook Ra8.
Mar-11-17  saturn2: Blacks play in the opening was amazingly weak considering her rating.
Mar-11-17  morfishine: Black really botched this opening, but thats how one learns: miss just one move in the opening and its all over

*****

Mar-11-17  Carlos0012358: By the time it gets to 19.Qa5+ Black's game is lost:

19.............Rxa5
20.Bb6+ Ke8
21.Nc7+ Kd8
22.Nxc6+

White takes the black Q and double check. Then

22.............Ke8
23.Nc7+ Kd8
24.Bxa5

And black looses also the Rook. Now white has a Rook for a pawn and wins.

The questions is why did it get to 19.Qa5+? Which were black's errors?

15.....Kd8 instead of 15......cxb5?
16.....b3 Rather tan 16.....Ra6?
17.....Rxa4 instead of 17.....f6?

Playing better, black would have still been at a slight positional disadvantage but would have maintained material balance and taken the game much further.

Mar-11-17
Premium Chessgames Member
  catlover: Wow...exploiting a weak back rank. I totally missed this one. I kept trying to find a way to trap the exposed queen.
Mar-11-17  Carlos0012358: I should add that with all that said, on 17.Qc3, you must see the N on c5, the Q and B lined up to attack on the a5-d8 diagonal, and the N fork on c7. So, playing 17.....Rxa4 followed by 18.....Ra6 is setting yourself up for disaster.
Mar-11-17  RandomVisitor: After 14...Nd7 no escape for black


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Komodo-10.1-64bit:

<+4.36/46 15.Nb5 cxb5 16.axb5 Rb8> 17.Bf4 g5 18.Bxb8 Nxb8 19.Rfc1 Bg7 20.Qxc8+ Qxc8 21.Rxc8+ Kd7 22.Rc2 Bd4 23.e5 Bxe5 24.Rd1+ Ke6 25.Bxb7 Kf6 26.b6 h5 27.Rdd2 Bd6 28.Bg2 Nd7 29.b7 Nc5 30.Rc4 Nxb7 31.Bxb7 h4 32.Kg2 Rb8 33.Be4 hxg3 34.fxg3 Rb5 35.Bd5 Kg6 36.Rc8 Kg7 37.Bc4 Re5 38.Rd1 Ra5 39.Rd8 Be5 40.R1d2 f5 41.Re2 Kf6 42.b3 g4 43.Re8 Rc5 44.Rf8+ Kg5 45.Rg8+ Kh6 46.Rf8

Mar-11-17  JTV: I think Blacks best move. in order to prolong the agony, would have been 15...cxb5. I have never seen anyone blocking the e pawn from development, in this case 9...Qe6, and win the game...
Mar-11-17
Premium Chessgames Member
  bubuli55: Strong game by Nisha Mohota. 19.Qa5+ is indeed difficult.
Mar-11-17  BOSTER: Not too many resisted the temptation to sacr the piece to open two files in the POTD pos. So 15. Nb5,if cxb5 16.
axb5 Rb8 16.Rfc1 Nf6 17.Qc7 and black rook is caught.
Mar-11-17
Premium Chessgames Member
  bubuli55: It's probably not a good idea to hold on to that c pawn.

< Soumya Swam ina > ccuracies < than > excellent moves.

Mar-11-17
Premium Chessgames Member
  agb2002: White is one pawn down.

Black threatens bxa3.

White can try to take advantage of the holes in Black's queenside with 15.Nb5:

A) 15... cxb5 16.axb5

A.1) 16... Rxa1 17.Qxc8#.

A.2) 16... Rb8 17.Bf4

A.2.a) 17... Ne5 18.Qc7 wins decisive material.

A.2.b) 17... Kd8 18.Bc7+ Ke8 19.Bxb8 Nxb8 20.Ra8 wins decisive material (20... Qd6 21.Qxc8+).

A.2.c) 17... f6 18.Bxb8 as above.

A.3) 16... Nb6 17.Bxb6 Rxa1 (17... Qxb6 18.Rxa8 followed by Rxc8+ wins) 18.Rxa1

A.3.a) 18... Qxb6 19.Qxc8+ Qd8 20.Qxb7 Qd1+ 21.Bf1 f5 22.Ra8+ Kf7 23.Qd5+ Qxd5 24.exd5 g6 25.b6 Bg7 26.b7 Be5 27.Rxh8 wins (27... Bxh8 28.b8=Q).

A.3.b) 18... b3 19.Qc5 followed by Ra8 seems to win Black's LSB.

B) 15... Qe5 16.Bf4 wins decisive material.

C) 15... Kd8 16.Bf4

C.1) 16... axb5 17.axb5 looks similar or transposes to A.2.b.

C.2) 16... Ne5 17.Nd4 Qf6 18.Rfd1 (18.Bxe5 Qxe5 19.Qxc6? Qxd4) looks very strong. For example, 18... Bd7 19.Bxe5 Qxe5 20.Nxc6+ bxc6 21.Qxc6 Ra7 22.Rxd7+ Rxd7 23.Qa8+ Kc7 24.Rc1+ Qc3 (24... Kb6 25.Rc6#; 24... Kd6 25.Qc6#) 25.Rxc3+ bxc3 26.Qa5+ followed by 27.Qxc3 + - [Q+2P vs 2r]. The a- and b-pawns should win the ending easily.

Mar-11-17  Marmot PFL: 15 Nb5 is fairly easy to see, sacrificing the knight instead of retreating to exploit black's very bad development. It's harder to find good forcing moves if black plays passively but white solves the problem.
Mar-11-17  messachess: Clever. You just have to see it.
Mar-11-17
Premium Chessgames Member
  transpose: Mind blown. I did not consider black's weak back rank. I was actually postulating a positional sacrifice of a piece after Qc4 bxNa3 Qxe6 and black has trouble coordinating his pieces. Of course, it all makes sense once you are shown the way.
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