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Sarai Carolina Sanchez Castillo vs Ekaterina Ubiennykh
WJun Women (2001), Athens GRE, rd 6, Aug-21
Center Game: Berger Variation (C22)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Jul-30-10  rapidcitychess: Black to play
S Sanchez Castillo vs E Ubiennykh, 2001 15...?
15...Nxb3+ 16.any Re5
Too easy.
Jul-30-10  Patriot: Going back a move earlier, I probably would have still played 14...Nxb3+. It only looks slightly safer to me, because there is no prospect of a zwischenzug bishop sac (i.e. 14...Nxh5 15.Bxf7+?) which needs to at least be calculated even though it fails quickly. But it's really a matter of choice since the two moves appear to be equal.

15.axb3/cxb3 Nxh5 16.Qxh5 Re5 amounts to the same thing.

What's really funny about the puzzle position is that I most likely would have played 15...Nxb3+ quickly OTB, but because it's a puzzle I stared at the position for a while looking for a "puzzle move" expecting something more difficult. Maybe if this was rated as "Easy" I would have seen 15...Nxb3+ 16.axb3/cxb3 Re5 a lot faster.

Jul-30-10  Patriot: Strange...

I plugged move 14... into Fritz and it agrees with me that 14...Nxb3+ and 14...Nxh5 are about equal ( 2.98 and 2.84 respectively), but for some other reason.

It also agrees with my assessment that the bishop sac is possible: 14...Nxh5 15.Bxf7+ Kxf7 16.Qxh5+ Kg8 17.Bg5 Qd7 18.Rhe1 b4 19.Nd5 and I won't go into that further. I thought 15.Bxf7+ was absurd and concluded the line is losing for white, so the only reasonable reply is 15.Qxh5. As the game continues, that drops a piece anyway: 15...Nxb3+ 16.cxb3 Re5 17.Bg5 Qxg5+ 18.Qxg5 Rxg5. So white may as well nab a pawn with 15.Bxf7+?!, while losing a piece.

But against a human player that amounts to accepting the loss. White played it best forcing black to see 16...Re5 at the end.

I thought it was a strange puzzle but it seems to be getting stranger by the minute.

Jul-30-10  howlwolf: The puzzles seem too easy this week, which may mean watch out tommorow.
Jul-30-10
Premium Chessgames Member
  kevin86: Queen trap!!
Jul-30-10
Premium Chessgames Member
  YouRang: Got it fairly quick. I saw the white Q+B threat on f7, so I considered 15...g6 -- and while I was considering that, I noticed that the white queen had surprisingly few places to go (unfortunately, it had 16.Qh6).

Continuing that thought, I then noticed that the queen would really be helpless if I simply hit it with the rook via ...Re5, except of course that I had to first do something about the threat on f7.

The solution thus presented itself:
1. Eliminate the f7 threat with 15...Nxb3+
2. Trap the queen with 16...Re5.

Jul-30-10
Premium Chessgames Member
  Marmot PFL: Missed this one. I thought 1st of 15...g6, but 16 Bxf7+ still looks lethal, so i would just defend with 15...Be6, or maybe Nxb3+ first. At that point i might well see 16...Re5, but can't say for sure.
Jul-30-10
Premium Chessgames Member
  Jimfromprovidence: Plug 14 Ncd5 into the text if you want a very difficult end-of-the-week puzzle.


click for larger view

Can black still win?

Jul-30-10  Patriot: <Jimfromprovidence> "Can black still win?"

I would analyze it this way:

1) Black cannot allow 15.Nxf6+ Qxf6 16.Qxf6 gxf6 17.Nd5

2) 14...h6 doesn't look very threatening after 15.Nxf6+

3) 14...Re5 15.Nxf6+ again.

4) 14...Nxd5 15.Qxd5 Be6 16.Nxe6 fxe6 and black looks better

4) 14...Nxd5 15.Qxd8 Nxb3+ 16.cxb3 Rxd8 17.Nxd5 Rd7 or maybe 17...Ra7 18.Be3 gaining back the bishop pair or perhaps 17...c6 18.Ne7+ followed by 19.Nxc8 and regaining the bishop pair.

I don't see an advantage for black. Now I'll see what Fritz says...

Jul-30-10  Patriot: <Jimfromprovidence>

Now that I've seen what Fritz says...Very clever! That wasn't even on my list of candidates!

Jul-30-10  cjgone: I got it, whew I feel smart. It was total luck because I did a queen trapping puzzle a month ago. I couldn't do yesterdays though..

I noticed that the queen couldn't move anywhere because of the bishops and queens line. This meant that if I moved my rook down it would be completely trapped. Unfortunately, the queen can put me in check with the bishop line so I realized that I could take it with my knight and leave white's queen hanging! :D

Jul-30-10
Premium Chessgames Member
  David2009: S Sanchez Castillo vs E Ubiennykh, 2001 Black 15...?

15...Nxb3+ 16 axb3 Re5 wins material. 17 Qxe5 dxe5 18 Be3 doesn't work because Bxe3 is check, which leaves only 17 Bg5 Qxg5+ etc. Time to see what happened:
=====
Got it.

Jul-30-10  rapidcitychess: <Patriot<Very clever!>>

What's the move?

Jul-30-10  apexin: I noticed that the queen is trapped but i thought only of 15.g6 with similar ideas.
Jul-30-10
Premium Chessgames Member
  doubledrooks: <JimfromProvidence> wrote: < Plug 14. Ncd5 into the text if you want a very difficult end-of-the-week puzzle.>

How about 14...a4? I didn't examine all lines but one I found was:

15. Nxf6+ Qxf6 16. Qxf6 axb3! 17 Qxd4 bxa2 18. Bc3 ( 18. b3 Bxd4) a1=Q+ 19. Kd2 Qxd1+ 20. Rxd1 Bxd4 21. Bxd4 and black has won the exchange.

Jul-30-10  Patriot: <rapidcitychess>

I think <doubledrooks> figured it out above.

Jul-30-10
Premium Chessgames Member
  Jimfromprovidence: <doubledrooks> <How about 14...a4? I didn't examine all lines but one I found was:

15. Nxf6+ Qxf6 16. Qxf6 axb3! 17 Qxd4 bxa2 18. Bc3 ( 18. b3 Bxd4) a1=Q+ 19. Kd2 Qxd1+ 20. Rxd1 Bxd4 21. Bxd4 and black has won the exchange.>

You got what I got with Rybka freeware through the surprising 16...axb3, below. (leaving the queen en prise by not playing 16...gxf6 right away.)


click for larger view

After that it seems up in the air what's best. Maybe 17 cxb3 gxf6 18 Bc3 follows and white can get the doubled pawn on f6, leaving him down a piece for two pawns.


click for larger view

Jul-30-10  Ferro: BONITA PARTIDA
Jul-30-10  tacticalmonster: 1) b3 bishop is potentially trapped

2) WQ has a few retreating squares

3) c3 knight is vulnerable to b5-b4 giving d4 knight the e2 square

4) f7 pawn is only a threat if White double attack the king and e8 rook

Candidate:15 g6 and Re5

a) 15 g6? 16 Bxf7+! Kxf7 17 Qxh7+ Kf8 18 Qxg6

b) 15 Re5 16 Qxf7+ (16 Bxf7+ Kh8 BQ has nowhere to go) Kh8 17 a4 (17 Qf4 b4! 18 Be3 Nxb3+ 19 axb3 g5! ) (if 17 f4?? or Bf4?? Nxb3+ 18 axb3 Be6 ) (if 17 Bd5 c6 18 Be3 Ne2+! 19 Kd2! Nxc3 20 Bxc6 Be6 21 Qf4 Bxe3+ 22 Qxe3 Nxd1 23 Rxd1 Rc8 ) Nxb3+ 18 Qxb3 (If 18 axb3 Be6 19 Qf4 b4 ) Be6 19 Qa3 b4

Jul-30-10  TheChessGuy: 15...g6?? is a huge blunder; Black comes under a crushing attack that likely wins by force after 16.Bxf7+!. So, he has to cut the light-squared bishop or defend f7. Doing the latter would leave her passive, but positionally okay. I don't enjoy passivity (who does?) and capturing the bishop comes with check, so it's safe to remove it. After this, it's back to fundamental chess; what's the best way to continue the game? 16...Re5! is development with tempo and seems the strongest way to proceed. Looking at the position after the 16th, you notice that White's queen is trapped! So, by just playing solid, smart chess, you have miniaturized a WFM in sixteen moves!
Jul-30-10
Premium Chessgames Member
  David2009: <Jimfromprovidence: Plug 14 Ncd5 into the text if you want a very difficult end-of-the-week puzzle.> Let's rewind to the previous move. Can this position be drawn against the End Game Trainer (link below) if so how? White to play:


click for larger view

Sanchez Castillo vs E Ubiennykh 15? http://www.chessvideos.tv/endgame-t... Who would have thought White was in such difficulties?

Jul-30-10  njchess: Devious puzzle. Once I concluded that there was no real attack against White's king, I turned my attention to her awkwardly placed queen.

I briefly considered g6, but that allows White's queen to escape via the c1-h6 diagonal. That is when I realized that her only safe square was h5. So, all I had to do was attack that square without changing the position around her.

Re5 became pretty obvious, but White could play Bg5 creating a safe haven for her queen on h4. True, she would be down a piece, but still alive with plenty of chess to go.

That is when I saw the idea of being able to play Be3+ in response to Bg5. After that, Nxb3+ clears the route for Black's bishop, White must recapture or else Kb1 Nxd2+ and the overall plan still works.

So, I think it is 15. ... Nxb3!+ 16. cxb3 Re5!! and I'm looking for a resignation right then. Time to check.

I think White's game begins to go wrong with the early Bd2 and then really downhill with her castling long. She then places pieces in front of her position making her king susceptible to a pawn storm. She is then forced to move her queen out of the center. Rough game.

Jul-30-10  Patriot: <TheaM> Wasn't your name <TheaN>??
Jul-30-10  wals: 14.Nh5 was a no-no for White,incurring a penalty of -2.75. Alternatives,the first one which may have led to a drawn game, were:-

Analysis by Rybka 3 1-cpu:

1. (-0.46): 14.Nfd5 a4 15.Nxf6+[] Qxf6 16.Qxf6 gxf6 17.Bd5 c6 18.Nxb5 cxd5 19.Nc7[] Ba6 20.exd5 Ne2+ 21.Kb1[] Reb8 22.Nxa8 Bd4 23.Nb6 Rxb6 24.b3 axb3 25.axb3 Rb8 26.Rhe1 Kg7 27.h4 Bf2[] 28.Kb2

2. (-0.81): 14.Ncd5 a4[] 15.Nxf6+ Qxf6 16.Qxf6 axb3 17.cxb3 gxf6[] 18.b4 Bb6 19.Nd5[] Be6 20.Nxf6+ Kf8 21.Nxe8 Kxe8 22.Be3 Rxa2 23.Kb1 c5 24.bxc5 dxc5 25.Rd3 Ke7 26.Ra3 Rxa3[] 27.bxa3 Bc4[] 28.Rd1 Ke6[] 29.Kb2

3. (-0.88): 14.Rhe1 c6 15.e5 Nxb3+ 16.axb3 h6 17.Qh4 dxe5 18.Nd3 Bd6 19.Bxh6 gxh6 20.Qxh6 Bf8 21.Qg5+ Bg7 22.Rxe5 Qd6 23.h4 Bd7 24.Rxe8+ Rxe8 25.Nc5 Qe7 26.Nxd7 Nxd7 27.Ne4 Qxg5+ 28.hxg5 Nf8

4. (-0.90): 14.a4 Nxb3+ 15.cxb3[] bxa4 16.bxa4 c6 17.Nd3 Bb6 18.Be3 Rb8 19.Rhe1 Bxe3+ 20.Qxe3 Nd5 21.Qd4 Qg5+

5. (-0.92): 14.Nce2 Nxe2+ 15.Nxe2[] Re5 16.Qg3

However, White off, tip toeing amongst the daisies, really blew it with, 15.Qxh5. -4.48. Sarai, you just have to do better.

Jul-30-10  otanod09: It is a great play from back.
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