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Zeng Chongsheng vs Lu Yijie
Chinese League (2011), Ningbo CHN, rd 2, Apr-13
Sicilian Defense: Najdorf Variation. English Attack (B90)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Nov-02-11  CHESSTTCAMPS: Material is even in this opposite-colored bishop middlegame. The old rule of thumb that the attacking side is effectively a piece ahead in opposite-colored bishop positions applies literally in this POTD. Both sides are attacking, and white on the move would have a tricky win with 1.Rxd6+ Kc5 (Kb7/c7 2.Rxd5) 2.b4+ Kc4 3.Qa2+ Kxc3 4.Qxd5! (Rxd5? Rxh4+! draws) Rxh4+ 5.Kg1 Qe3+ 6.Bf2 Qc1+ 7.Qd1.

Black on the move should win with 51... Rxg3! (but not Rxh4+?? 52.Kg1) 52.Kxg3 Qg4+ 53.Kh2/f2 Qxh4+ followed by 54... Qxf6 and white can resign.

Nov-02-11  CHESSTTCAMPS: <agb2002> simplifies the "White to Move and win" scenario. 3.Rxd5 (instead of Qa2+) crossed my mind, but I thought black had 3.... Qxd5 4.Qa2+ Kd4.
Nov-02-11  Patriot: First I looked at 51...Rxh4+, seeing that 52.Bxh4 Qxh4+ wins the rook on f6. But white could play 52.Kg1 and what then? White still has an attack against d6 so this didn't look right.

So 51...Rxg3 52.Kxg3 Qg4+ 53.Kf2/Kh2 Qxh4+ wins the rook. The only two potential moves I see to refute this are Qxd5+ and Rf4.

52.Qxd5+ Kxd5 (best) 53.Kxg3 Qg4+ and black wins the house.

52.Rf4 Rxg2+

A) 53.Qxg2 Qxg2#

B) 53.Kh1 Rxd2+ 54.Rxe4 Bxe4+

C) 53.Kh3 Qe6+ 54.Rf5 Qxf5#

Nov-02-11  newton296: its all about the loose rook at f6
Nov-02-11
Premium Chessgames Member
  paavoh: The sequence Rxg3/Qg4+/Qxh4/Qxf6 came to me surprisingly quickly. Was it too easy for Wednesday, or am I getting better at this?
Nov-02-11
Premium Chessgames Member
  gawain: I am so disappointed with myself for this one. Just like <dzechiel> I saw the 51... Rxh4+ 52 Bxh4 Qxh4 fork and win for Black. But right, there is no win if W refuses with 52 Kg1. I overlooked that the fork was equally available after 51... Rxg3 52 Kxg3 Qg4+ K move.
Nov-02-11  Memethecat: <51...Rxg3 52Kxg3 Qg4+ 53K~ Qxh4+> forking the R & black is up a B.
Nov-02-11  awfulhangover: dzechiel:

<..............
51...Rxh4+

Taking the rook just drops a piece and a pawn, eg: 52 Bxh4 Qxh4+ 53 Kg1 Qxf6

So, I think white would be much better off playing

52 Kg1

OK, black has won a pawn, but what's the follow up? I considered

52...Qg1+ 53 Rf1 Rh1+ 54 Kxh1 Qxf1+ 55 Kh2>

Huh??

<al wazir: <dzechiel>: Your post *exactly* describes my thought processes, step by step, from beginning to end. So you must be right.>

Really? :-)

Nov-02-11  CHESSTTCAMPS: Just for fun, win the puzzle position against Crafty EGT, altered to White on the move.

http://www.chessvideos.tv/endgame-t...

Nov-02-11  sevenseaman: <CHESSTTCAMPS> White wins.
Nov-02-11  MaxxLange: not the English attack
Nov-02-11
Premium Chessgames Member
  kevin86: I drew the short straw again. My move was Rxh4+ wins a pawn,but the text wins a piece.
Nov-02-11  jackalope: <51. ...>?

Material is even - Black's LSB vs White's DSB - no passed pawns. Black can pick up White's bishop and one pawn.

<51. ... RxBg3 52. Rf2 (to prevent queen fork and save his rook) Qxh4+ 53. Kg1>

Black is up a B + P but White still has some fight left as he retained his rook.

I think this is right - time to check...

Nov-02-11  jackalope: A theory question - <6... e6> rather than <6... e5>? Is this to keep White's knight from f5 and to prevent diagonal access to Black's f7 pawn?
Nov-02-11  brainzugzwang: Like others, I started with 51...Rxh4+ but didn't see a convincing followup, then went to 51...Rxg3 52.Kxg3 Qg4+ 53.Kf2 Qxg2+ and got stuck again. So I looked for a better way to contiinue the attack after Qg4+, and that's when I noticed the White R was loose. Game over.

But I haven't seen anyone here talk about 51.Rf6, which seems like a ?? to me. Does White have anything better there? Am I missing something for Black after the apparently simple 51.Re3?

Nov-02-11  mworld: At under 10 seconds this has to be either a monday or a spoiler. I thought I had to be wrong and that there was probably a mate I was missing.
Nov-02-11
Premium Chessgames Member
  chrisowen: In tease Lu Yigie 51.Rf6 aint it fungus old chinese remedy crow take away clerics try add cream of branch sticky sticky wombat one man guy queen brill g4 word rain check to go king in god we trust rap ease king see untouchable rabbi d5 flying a sinch ZC cease and desist after effect qg4 king chu.
Nov-02-11  Patriot: <brainzugzwang> <But I haven't seen anyone here talk about 51.Rf6, which seems like a ?? to me. Does White have anything better there? Am I missing something for Black after the apparently simple 51.Re3?> 51.Rf6 is like crossing the road without checking for oncoming traffic. I couldn't find anything wrong with 51.Re3, but wasn't sure it's the best move. So I ran it through Houdini and it said 51.Re3 is dead even. It likes 51.b3 best (+0.48) and 51.Qf2 as second best (+0.28).
Nov-02-11  BOSTER: Because solving today <POTD> we have some players with the same thought process like <dzechiel> I want to analyze it.

I don't think that somebody will take into consideration my remark with animosity.

At first <dzechiel> have examined the variation 51...Rxg3 52.Kxg3 Qe5+ 53.Qf4.(B.T.W. white can play 52.Rxd6+)

Then you tested the second variation 51...Rxh4+ 52.Bxh4 or 51...Rxh4+ Kg1.

After this you were jumping from second variation back again to first 51...Rxg3 (this is really forced line).

Being systematic and not jumping from one variation to another and back again is an idea borrowed from how computer analyse positions. Sometimes I try to follow it,but this is not easy.

Nov-02-11  shannie: So often the key to these problems is to sac the exchange.
Nov-02-11  RandomVisitor: After 49...Kc6 white might have a winning move:


click for larger view

50.Qa7! Rxh4+ 51.Bxh4 Qxh4+ 52.Kg1


click for larger view

20 +2.51 52...Qe1+ 53.Rf1 Qe2 54.Qxa6+ Kc7 55.Qa7+ Kc6 56.Qf2 Qxf2+ 57.Kxf2 g5 58.Ke3 Kd5 59.Rf6 h4 60.Rh6 Ke5 61.Rh5 Kf5 62.Rh8 Bd5 63.Kf2 Bc4 64.Rh6 d5 65.Ke3 Bf1 66.Kf3 Bd3 67.Rh8

20 +2.71 52...Qa4 53.Rf6 Qd1+ 54.Kh2 Qe1 55.Qxa6+ Kc7 56.Qa7+ Kc6 57.Qf2 Qxf2 58.Rxf2 Kd5 59.Rf6 Bf5 60.Kg3 Ke5 61.Rf8 g5 62.Rg8 Kf6 63.Kf3 h4 64.Rb8 Bd7 65.Rd8 Bc6+ 66.Kg4 Ke7 67.Rb8 Bxg2

Nov-02-11  RandomVisitor: After 45...Kc8:


click for larger view

46.Rf6!

19 +1.85 46. ... g5 47.hxg5 Qe4 48.Rf8+ Kb7 49.Rf7 Qe6 50.Rf6 Qe4 51.Bxd6 Rh4+ 52.Kg1 Qb1+ 53.Qf1 Qxf1+ 54.Kxf1 Rg4 55.Bf4 h4 56.Rf7 Kc6 57.Kf2 Be8 58.Rf5 Bg6 59.Rf6+ Kb7 60.Ke3 Bc2

Nov-02-11  stst: will just go for
51...RxB
Nothing W can do to wait for next
52...Rxg2
If WQ doesnt move in 52 it'll be lost!
Nov-02-11  TheBish: Zeng Chongsheng vs Lu Yijie, 2011

Black to play (51...?) "Medium/Easy"

Pretty simple but instructive tactic. Notice how every White piece is on a dark square, except the g2 pawn! The combination begins by eliminating a key piece which protects a key square, giving the Black queen a fork which wins material. After solving it, I noticed that White is threatening Rxd6+, but he won't get a chance.

51...Rxg3! 52. Kxg3 (forced) Qg4+ 53. Kf2

Or 53. Kh2 is the same.

53...Qxh4+ 54. Kg2 Qxf6

Black wins easily, up a piece and a pawn.

Nov-03-11  brainzugzwang: <Patriot ... 51.Rf6 is like crossing the road without checking for oncoming traffic. I couldn't find anything wrong with 51.Re3, but wasn't sure it's the best move. So I ran it through Houdini and it said 51.Re3 is dead even. It likes 51.b3 best (+0.48) and 51.Qf2 as second best (+0.28).>

Thank you -- at least I was able to understand your post without running it through Babel Fish, unlike some others above yours :)

Reason I looked at 51.Re3 right off the bat is that it forces the Black Q to make a decision, since ...Rxg3 is answered by removing said Q. But again, almost anything seems better than Rf6.

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