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Carl Ahues vs Sultan Khan
"The Sultan of Swat" (game of the day Jan-05-2008)
Liege (1930), Liege BEL, rd 3, Aug-21
Nimzo-Indian Defense: St. Petersburg Variation (E43)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 4 ·  Later Kibitzing>
Jan-05-08  Sailfish: Can someone please explain the lines for Black's mate? I feel like i see a few ways out for white.. and he also has material advantage.
Jan-05-08
Premium Chessgames Member
  Benzol: 47.Ke2 Qh2 and what does White do to defend the 'g' pawn?
Jan-05-08  Malfurion: There's really no answer for the impending Qh1+ Ke2 Qxf2# without sac'ing the queen for the rook, which is losing. If white plays the immediate Ke2, Qh2 serves the same purpose of Qxf2. If Ke2 Qh2 Kf1, you transpose back to the Qh1 line..
Jan-05-08  mrsaturdaypants: White has to prevent Qh1+ followed by Qxg2#. What can he do?

Moving the rook just leads to mate with the queen at f2. White's king has two legal moves, one of which (g1) accomplishes nothing, and the other of which (e2) leads quickly to the loss of his queen or similar disaster. Even Qxd3 sets up mate in one.

The best I can see for white is 47.Ke2 Qh2 48.Qxd3 cxd3+ 49. Kxd3, when white's material deficit doesn't look entirely insurmountable until you consider how he's supposed to stop black's g pawn from queening without sacrificing his rook.

Unless I'm missing something, I think white resigned at the right time.

Jan-05-08  hovik2003: More like Sultan of Swing!
Jan-05-08
Premium Chessgames Member
  An Englishman: Good Evening: I like how White slowly runs out of things to do seemingly without Black doing anything. Khan's play in this game is half boa constrictor, half sleeping pill.
Jan-05-08  Calli: A sly combo by Sultan Khan. Very interesting how he rejects taking the pawn at c3 several times in favor of keeping up the presssure.

Instead of 44.Qb1?, White had 44.Re6! The point is that if 44...Ng3+?? 45.hxg3 fxg3 46.Rc6 Qh5 47.Rxc4 wins.

Jan-05-08  Gilmoy: Nimzo: control e4, create c3-weakness. 8-10..Ne4-f5-Nf6 stymies White's center thrust on e? 23..Qa5 and the c3-weakness handcuffs White's Q. 26..Nxd5 Black accepts two isolated pawns for tactical compensation: they win two tempi immediately by kicking the white Rook around, establish the mighty d3-outpost, plus White's c3-pawn is isolated, too. 34.Bxf4 White can't allow Ne3 "a rusty nail in the knee", but that fixes one pawn. 41..Qb6 42.Qc2 White can't fix the other one, too.

<Calli's 44.Re6> looks like the right idea -- attack the isolated pawn from behind.

Jan-05-08  kevin86: Black showed a little deft when he failed to fall for the twopenny trap at move 38...Qxe5?? 39 Ng6+ picks up the wayward queen.}

One thing very unusual at the finish: Notice white's pawn at f2 is twice defended and not attacked at the end of the game. See how quickly one defender is blocked and the other routed as the lethal capture is made.

Jan-05-08  TigerG: How does The Sultan of Swat fit this game?
Jan-05-08
Premium Chessgames Member
  Jimfromprovidence: After the colossal blunder 44 Qb1?? black did not make any mistakes.

44 a3, a4 or Qe2 would all have been perfectly fine.

The unforced 44 Qb1 took the queen right out of the match.

Jan-05-08  apple pi: How does black defend 29.♖h4?
Jan-05-08  MaxxLange: Sultan of Swing is better, yeah. Classier, as they say.

This player has always fascinated me - a complete unknown who could contend with Capablanca.

Jan-05-08  patzer2: Black's demolition 44...Ng3+! does indeed hit a home run, leading to a quick mating attack. In the final position, some likely possibilities are 47. Ke2 (47. Rc1 Qh1+ 48. Ke2 Qxg2+ 49. Ke1 Qg1+ 50. Ke2 Qf2#) 47... Qh2! 48. Rc1 Qxg2+ 49. Ke1 Qg1+ 50. Ke2 Qf2#.

Oct-22-09  dzechiel: Black to move (44...?). Material even. "Medium."

For those of you who are not familiar with Mir Sultan Khan (the victor in this game), here's the Wikipedia link:

http://en.wikipedia.org/wiki/Mir_Su...

His life make's very interesting reading.

OK, back to the position. The black rook on d3 is key to this position. It is firmly anchored deep in white's position, and restricts the scope of the white pieces. But! It's also pinned against the black king and white will attempt to trade it off if given half a chance.

Looking for forcing moves for black, the only thing that comes to mind is...

44...Ng3+

This only leaves white with one legal move:

45 hxg3 fxg3

This last move accomplishes two goals for black. First, it threatens mate with 46 Qf2#, and it opens the h-file for the black queen to gain access to the king.

White has three reasonable ways to protect against the mate, but all are met with the same reply.

46 Qc2

I like this over 46 Re2 and 46 Qb2 because the rook move deprives the white king of a vital flight square, and 46 Qb2 breaks the pin of the black rook.

46...Qh5

Now threatening 47...Qh1+ 48 Ke2 Qxg2#. White has no really good way to defend. For instance

47 Ke2 Qh2 48 Qxd3 Qxg2+ 49 Kd1 cxd3

and the threat of 50...Qc2# cannot be answered. Other moves meet with similar consequences, in some variations the black g-pawn gets moving.

I'm sure this is it, time to check and see how the game actually ended.

Oct-22-09  fouard: Didn't see it all. Blame it on my Dodgers being eliminated.
Oct-22-09
Premium Chessgames Member
  OBIT: It took me about 15 minutes to find this, but now I see the answer: 44...Ng3+ 45. hxg3 fxg3 and now after either 46. Re2 or 46. Qc2, Black has a mating attack after Qh5!
Oct-22-09  dzechiel: <fouard: Didn't see it all. Blame it on my Dodgers being eliminated.>

I turned it off in the bottom of the first after two walks and a home run.

I attended the only Dodger win over the Phillies this post season, and even that game was unimpressive from an offensive standpoint. <sigh> Wait 'til next year.

Oct-22-09  Formula7: I think I got it. 44...Ng3+ 45.hxg3 fxg3 now if Re2 then Qh5! with unstoppable mate. Qh5 is also decisive after Qb2 or Qc2.
Oct-22-09  goldfarbdj: Ng3+ was easy enough to find, but I didn't see the answer Qh5 to white guarding the second rank. (I thought Re2 rather than Qc2, but it all comes to the same thing.)
Oct-22-09  Athamas: Even material. White's king is vulnerable, it's just a matter of how to attack it. Black's rook is pinned, which means only the queen or knight are options. Pretty easy to spot the move I think.

44...Ng3+ 45. hxg3 fxg3

Now white has 2 options to block the mate threat and they both fail.

46. Re2 Qh5 47. Re1 Qh1+ 48. Ke2 Qxg2#

46. Qc2 Qh5 47. Ke2 Qh2 and white gives up a lot of material.

Sacrificing the queen for the rook earlier doesn't work either.

Oct-22-09  TheBish: Ahues vs Sultan Khan, 1930

Black to play (44...?) "Medium"

I believe this is a fairly well-known game. I'm sure I have seen at least the finish, though I wasn't sure until I found the solution. In any case, it's not too tough because there's only one move that does any damage, and the knight wants to attack!

44...Ng3+! 45. hxg3 fxg3

Threatening mate. Now:

A) 46. Qc2 (Qb2 is similar) Qh5 (threatening mate in 2) 47. Ke2 Qh2 48. Rc1 Qxg2+ 49. Ke1 Qg1+ 50. Ke2 Qf2#.

B) 46. Re2 Qh5 47. Rb2 (other moves lose more quickly) Qh1+ 48. Ke2 Qxg2+ 49. Ke1 Qg1+ 50. Ke2 Qf2#.

Oct-22-09  lost in space: o.k.

44...Ng3 45. hxg3 fxg3

A: 46. Qc2 Qh5 (the key move) 47. Ke2 Qh2 with the threat of Qxh2#. White can only sac the queen for a rook, but this is lost anway.

B: 46. Re2 Qh5. White has to play Qxd3 or mate on h1 or

Oct-22-09  VincentL: In this "Medium" position material is equal.

There are not so many pieces on the board, and the black rook is pinned.

This clearly starts:

44..... Ng3+ 45. hxg3 (only move to get out of check) fxg3.

Now black threatens 45.... Qf2 mate

White can defend f2 with 45. Re2 or 45. Qb2/Qc2

But then black plays 45.... Qh5, and 46.... Qh1 mate cannot be stopped easily.

The only tries are

(a) 46. Kg1 but then 46..... Qh2 is mate

(b) 45. Qc2 and then 46. Ke2.

But after 46... Qh2, white cannot prevent 47... Qxg2 mate on the next move.

Oct-22-09  VincentL: My last line is incorrect - white can give up material to prolong his fate. e.g. 48. Rg1 or 48. Qxd3+

Also after 48. Kf1 white continues 49....Qh1+ 49. Ke2 Qxg2+ mate

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