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Aleksander Petkov Delchev vs Veselin Aleksandrov Topalov
FIDE World Championship Knockout Tournament (2004), Tripoli LBA, rd 2, Jun-21
Nimzo-Indian Defense: Normal Variation. Bishop Attack (E47)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Given 27 times; par: 47 [what's this?]

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Kibitzer's Corner
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Sep-15-15
Premium Chessgames Member
  patzer2: My pick was 33...Nxf3, which wins after 34. Qxe3 Rxe3 (-4.80 @ 21 depth, Deep Fritz 14), but is not as strong as the game continuation 33...Rxf3! 34. Nxf3 Nxf3 (-17.97 @ 20 depth, Deep Fritz 14).

The clear losing move is the pawn grab 30. Qxa2?, allowing the winning game move 30...Qh4 or the even stronger 30...Rxf3+! .

Instead, 30. Qd2 Ng5! (-1.35 @ 21 depth) keeps Black in the fight.

Earlier in the opening I prefer 10. Nxd5 = as in Tkachiev vs G Sargissian, 2011.

Sep-15-15  M.Hassan: "Easy"
Black to play 33....?
Equal

33.........Rxf3+
<if 34.gxf3 Qxd2 and White Queen is lost>

34.Nxf3 Nxf3 threatening mate on g1
35.gxf3 Qxd2
36.Red1 Qf4
Black is stronger now.

Sep-15-15  dfcx: too many good choices.

33...Nxf3 and Rxf3 are both good candidates.

A. 33...Nxf3
A1. 34.Qxe3 Rxe3 35.Nxf3 (35. Rxe3? Qxg1+ mates, 35.gxf3 Rxe1 ) Qf4

A2. 34. gxf3? Qxd2

A3. 34. Nxf3 Rxf3+ 35.gxf3 (35.Qf2? Qh1#) Qxd2 36.Rxe8 Qxc1+

B. 33...Rxf3+ 34.Nxf3 (34.gxf3 Qxd2) Nxf3 35.gxf3 (or Qg1#) Qxd2

33...Rxf3+ is much stronger.

Sep-15-15  Cheapo by the Dozen: The main difficulty here is move order. One that works is

33 ... Rxf3+
34 Nxf3 Nxf3

White has several ways to avoid immediate mate, but most wind up with him giving up material -- queen, knight, and pawn for 2 rooks, or worse. Also I'm not too sure they really avoid quick mate.

------------------

I had most of this quickly, but was briefly stumped by White's Qf2 choice. But that turns out not to stop mate at all, after ... Qa1+

Sep-15-15
Premium Chessgames Member
  diagonalley: went for 33... NxP - which wins, albeit with a couple more lines to calculate... i think it's still worth a point :-)
Sep-15-15
Premium Chessgames Member
  agb2002: The material is identical.

White threatens 34.Rxe3.

The white queen is defenseless. This suggests 33... Nxf3:

A) 34.Nxf3 Rxf3+ 35.gxf3 (35.Qf2 Qh1#) 35... Qxd2 - + [Q+P vs R].

B) 34.gxf3 Qxd2 - + [Q+P vs N].

C) 34.Qf2 Rxe1+ 35.Rxe1 Rxe1+ 36.Qxe1 Qxg1+ 37.Ke2 Nxe1, etc.

D) 34.Qxe3 Rxe3

D.1) 35.Nxf3 Qf4 - + [Q+P vs R+N].

D.2) 35.Rxe3 Qxg1+ 36.Ke2 Qxc1 wins.

D.3) 35.gxf3 Rxe1+ 36.Rxe1 (36.Kxe1 Qxg1+ - + [Q+P vs R]) 36... Qxc2 - + [Q+B+P vs R+N].

E) 34.Rxe3 Qxg1+ 35.Ke2 Qxg2+ 36.Kd1(3) Qxd2#.

Sep-15-15
Premium Chessgames Member
  agb2002: 33... Rxf3+ is considerably stronger than 33... Nxf3 because White cannot play 34.Qxe3.
Sep-15-15  Cybe: 33... Nh3 works too: 34. Q:e3, 34... R:e3, 35. N:h3 etc.
Sep-15-15
Premium Chessgames Member
  Once: A little bit messy for a Tuesday, perhaps?

The key point here is that the g2 pawn is pinned against the loose white queen. So if we can unload a repeater on f3, the final Nxf3 will be a fork of the white Re1 and queen.

Sep-15-15
Premium Chessgames Member
  morfishine: Check first <33...Rxf3+> 34.Nxf3 Nxf3

<agb2002> well explained

Sep-15-15  CHESSTTCAMPS: Material is even, but the white king position is weakened. White has likely just played Ne2g1, intending to exchange all rooks and eliminate black's pressure on the e-file. But black doesn't have to cooperate.

33... Nxf3! exploits the pin on the g-pawn. White has no satisfactory defense:

A.34.Nxf3 Rxf3+ 35.gxf3 (Qf2 Qh1#) Qxd2 wins.

B.34.gxf3 Qxd2 wins.

C.34.Rxe3 Qxg1+ 35.Ke2 Qxg2+ 36.Kd1/d3 Qxd2#

D.34.Qf2 Rxe1+ 35.Rxe1 Rxe1+ 36.Qxe1 Qxg1+ 37.Ke2 Qxe1+ is a rout.

E.34.Qxe3 Rxe3 35.Nxf3 (Rxe3 Qxg1+ 36.Ke2 Qxg2+ 37.Kd1/d3 Qd2#) Rxf3+ 36.gxf3 Bd7 37.Red1 (Re2? Qh1+) Bh3+ 38.Ke1 Qg6+ 39.Ke2 Bg2 40.Rd3 h5 and the advance of the passed h-pawn is decisive.

F.34.other Qxg1#

Line E makes this extensive for a Tuesday. Time for review..

Sep-15-15  CHESSTTCAMPS: All has been thoroughly explored already and clearly the game continuation is much stronger.
Sep-15-15  starry2013: All I saw was winning the queen, which led me to a winning game

Rxf3+ 2.gxf3 Qxd2 3.Red1 Qe3 4.Re1 Qf4 5.Rcd1 Nxf3 6.Nxf3 Qxf3+ 7.Kg1 Rxe1+ 8.Rxe1 Bd7 9.Bd1 Qg3+ 10.Kf1 Bh3+ 11.Ke2 Bg4+ 12.Kd2 Qf4+ 13.Kd3 Qg3+ 14.Kd2 Qf2+ 15.Re2 Bxe2 16.Bxe2 h5 17.Kd3 h4 18.Bd1 h3 19.Be2 h2 20.b4 h1=Q 21.Kc3 Qxe2 22.b5 Qhf3+ 23.Kb4 b6 24.a5 Qb2+ 25.Ka4 Qfb3#

Sep-15-15  wooden nickel: <Cybe: 33... Nh3 works too: 34. Q:e3, 34... R:e3, 35. N:h3 etc.> Yes, indeed!
If 34.Nxh3 Rxf3+, things get even worse:


click for larger view

Sep-15-15  zb2cr: 33. ... Rxf3+; 34. Nxf3, Nxf3. White is threatened with ... Qg1#, so he must remove the Knight with 35. gxf3. Now the point of the combination emerges: 35. ... Qxd2. Black is now up by Q+P vs. R, with a simple win in prospect.
Sep-15-15  awfulhangover: I went for Nh3 too. Cant find why it isn't good, maybe a comp can?
Sep-15-15  TheaN: Somewhat of a tricky Tuesday, not not for the fact there is a winning move and a not winning move; all three candidates win but one is significantly stronger than the others.

From the get go I was fixated on a knight move and spotted f3 was a weak spot: after seeing the 34.Nxf3 Rxf3+ combination I was certain this had to be the solution.

Before reviewing the game, I pondered whether Nh3 would be more effective, because it avoids Qf2. I noticed 34.Qxe3 would be somewhat annoying and at the same time realized that after 33....Nxf3 34.Qf2? Rxe1+ completely destroys the position anyway. Tl;dr I settled on Nxf3.

However, it is striking how, one sees 34.Qxe3 after 33....Nh3 but fails to consider it after 33....Nxf3. This one defensive move, despite still winning for black, makes 33....Rxf3+! about three times as strong as after the forced 34.Nxf3 Nxf3 white is in the exact same combination but now without Qxe3.

I'd say Nxf3 and Nh3 are worth a point, but it isn't the most efficient way.

Sep-15-15  TheaN: For reference:


click for larger view

Analysis by Stockfish 5 64 SSE4.2:

1. (-12.70): 33...Rxf3+ 34.gxf3 Qxd2

2. (-5.40): 33...Bb5+ 34.axb5 Rxf3+ 35.Nxf3 Nxf3 36.Kf2 Nxd2

3. (-4.63): 33...Nxf3 34.Qxe3 Nxe1 35.Qxe1 Rxe1+ 36.Rxe1 Qf4+

4. (-4.18): 33...Nh3 34.Qxe3 Rxe3 35.Nxh3 Rc3

5. (-0.80): 33...R3e6 34.Rxe6 Rxe6 35.Qf2 Bd7

Sep-15-15  TheaN: Interesting to consider 33....Bb5+ as 34....Rxf3+ still works even after 34.axb5. After 34.Kf2 however: 33....Bb5+ 34.Kf2 Rxf3+ 35.Nxf3 Nh3# is beautiful.


click for larger view

Sep-15-15
Premium Chessgames Member
  whiteshark: 2nd best choice gets the job done, too.
Sep-15-15
Premium Chessgames Member
  kevin86: White must lose the queen or be mated!
Sep-15-15  BOSTER: < EXIDE: I went with 33...Nxf3>.

Why move 33...Rxf3 is more preferable.
First, this is check, and this means the answer is forced. Second, move33...Nxf3 need more caculations like Qxe3 or Qf2.

Sep-15-15
Premium Chessgames Member
  chrisowen: Oaf rook first or knight carry basket etc two,

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Sep-15-15  JimNorCal: " was briefly stumped by White's Qf2 choice. But that turns out not to stop mate at all, after ... Qh1+"

Thanks, that was bugging me. It isn't mate till Qg1 QxQ but that's enough to display the superiority of Rxf3+ to start the combo.

Sep-15-15
Premium Chessgames Member
  Penguincw: White's in a bind for sure, but I didn't get it.

Topalov wins with black for both the GOTD and POTD.

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