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Matthias Roeder vs Mark Hebden
x-B (1992), Bern SUI, rd 8
King's Indian Defense: Orthodox Variation. Classical System Misc. Lines (E98)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
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Dec-09-16  dumbgai: 42...Nxf3 43. Kxf3 Qh5# is a very cool-looking mate. 43. gxf3 also fails due to ...Qh2+ and ...g2-g1. White should have played 42. Ne1 to defend f3 and g2.
Dec-09-16
Premium Chessgames Member
  Big Pawn: This one was pretty easy for a Friday. First I looked at 43...Qh1 but after 44. Ne1 it looked like black could hold.

Then I noticed that if 43...Nxf3 white can't capture with the King because of mate along the diagonal. From here we can see that ...Nd4+ looms and the bishop is hanging on a5.

Nice puzzle.

Dec-09-16
Premium Chessgames Member
  YouRang: Friday 42...?


click for larger view

A little bit of a stumper today. I (black) can win the exchange with 42...Nxc7 43.bxc7, but at the expense of a protected passed pawn on the 7th rank. Sounds like a bad bet.

I looked for an attacking move with queen: 42...Qh1 (threat ...Qxg2+), but then 43.Ne1 seems to throw cold water on that idea.

The only other interesting chance for attack is to move the knight, which obviously hangs my queen. This means that the only try is <42...Nxf3> so that <43.Rxh7> can be answered by a queen-recovering knight fork: <43...Nd4+>.


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The queens will be exchanged, but black will end up with a winning double attack (king attacking Rh7 and knight attacking Ba5).

So, what happens if white doesn't take the queen on move 43?


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- Take N with P: 43.gxf3 Qh2+ 45.Kd1 g2 and now black will promote and win.

- Take N with K: 43.Kxf3 Qh5#

- Move K: 43.Kd1 (not Kf1? Nd2+) Qh1+ 44.Ne1 Nxe1 45.Bxe1 Nxc7 46.bxc7 47.Qxg2 and black's connected passers on f & g should win easily.

Dec-09-16
Premium Chessgames Member
  gofer: This one seems to be balanced on a knife edge, but I think black can give up his queen for an advantage...

<42 ... Nxf3!>

43 Rxh7 Nd4+
44 Kf1/Ke1/Kd1 Nxb3

Black is attacking Ba5 and Rh2, but has also one an important pawn. So the queen is immune!

43 Kxf3 Qh5#

43 gxf3 Qh2+
44 Ke1/Kd1 g2 (Kf1 g2+ oe Kf3 Qh1+ 45 Ke2 g2 )

So white must find a way to give up the pawn "gracefully"...

43 Kf1/Ke1 Qh1+

<43 Qc4 Nd4+>
<44 Kd2 Qxe4!>

In just a few moves white's defences have been ripped apart...

~~~

Yep...

Dec-09-16
Premium Chessgames Member
  diagonalley: wow!... not often <diagonalley> cracks a friday puzzle... well, mostly :-)
Dec-09-16
Premium Chessgames Member
  An Englishman: Good Evening: The seemingly bold 42.Rc7 gets a "??," but aside from the obvious 42.Ne1, does 42.Nxe5,dxe5; 43.Rc7!? (d6!?) give White enough of an attack to compensate for the Knight? What bothers me is that 42.Nxe5,Qh1 might prove too strong of a counterattack.
Dec-09-16
Premium Chessgames Member
  agb2002: Black has a knight for a bishop.

White threatens Rxh7 and Nxe5.

The obvious 42... Nxc7 seems to give White counterplay. For example, 43.bxc7 b5 44.Nxe5 dxe5 45.d6+ Qf7 46.Qxf7+ Nxf7 47.d7 + -.

Black can take advantage of the position of White's royal family to expose the white king with 42... Nxf3:

A) 43.Rxh7 Nd4+

A.1) 44.Kd(e,f)1 Nxb3 45.Rxb7 Nxa5 - + [N].

A.2) 44.Kd2 Nxb3+ 45.Kc3 Kxh7 46.Kxb3 f3 wins.

B) 43.Kxf3 Qh5#.

C) 43.gxf3 Qh2+

C.1) 44.Kd(e,f)1 g2 wins.

C.2) 44.Nf2 Qxf2+ followed by 45... g2 wins.

D) 43.Nxe5 Nd4+ wins decisive material.

E) 43.Qd1 Qxe4+ 44.Kf1 Nh2#.

F) 43.Qc4 Qh2 44.Rc8 Qxg2+ 45.Kd1 Qf1+

F.1) 46.Kc2 Nd4+ 47.Kc3 Rxc8 48.Qxc8 Kf8 49.Qxb7 g2 looks winning.

F.2) 46.Bd1 Rxc8 47.Qxc8 Qxd3+ wins decisive material.

F.3) 46.Ne1 Qxc4 47.Rxc4 Nd4 - + [N+2P vs B].

Dec-09-16  paramount: GOTD!!!
Dec-09-16  clement41: Highly entertaining KID today!
I managed to find the game's moves from move 42 to white's 46th, but expected 46...RxR 47 ba Nc7 covering a8 48 Nb4 with 49 Nxa6 Na8 to come and it looks to me. It should be noted that in the line 43 gf, black should not in my opinion take on c7 as it hands white the annoying threat Qxb7 attacking the Ra8 with a promotion threat
Dec-09-16
Premium Chessgames Member
  Once: Okay, I think we've all nailed the puzzle. So now let's ask the awkward question ...

You're playing white and it's your turn to move with this position:


click for larger view

42. Rc7 looks awfully tempting, doesn't it? Rook to the seventh, attacks the queen and we're happy to sac the exchange in return for promotion tricks.

Let's have a show of hands. How many of us would have seen that 42. Rc7 loses to 42...Nxf3?

I'd like to think that I would have seen it, but I have a strong feeling that I would not have.

Good puzzle. Harder for white to have avoided it!

Dec-09-16  scormus: I didn't think the first few move were difficult to find. But with the the W forces so placed, it wasn't so easy to be sure the sequence would be winning.
Dec-09-16
Premium Chessgames Member
  catlover: <Once> Nope. I wouldn't have seen it. Very fun puzzle.
Dec-09-16
Premium Chessgames Member
  kevin86: Queen sac leads to queen fork.
Dec-09-16
Premium Chessgames Member
  beenthere240: <dumbgai>
The problem with 42. Ne1 is ...Qxe4+ and white's game collapses. If white plays 42. Qc4 to protect the e pawn and move the Q out of danger, then Nd4+ and black takes the e pawn with Q next move.
Dec-09-16
Premium Chessgames Member
  Jimfromprovidence: I noticed at the ending how white's king is relegated to protecting the passed pawn threat.


click for larger view

Now, if 53 Kd3, say, then 53...f3.


click for larger view

Dec-09-16  thegoldenband: Saw 42...Nxf3 pretty much instantly, not because I'm anything special but simply because it's the kind of position where the key tactics pop out at me, especially in a puzzle format. (Believe me, there are plenty where they don't.)

<beenthere240: The problem with 42. Ne1 is ...Qxe4+ and white's game collapses. If white plays 42. Qc4 to protect the e pawn and move the Q out of danger, then Nd4+ and black takes the e pawn with Q next move.>

Isn't all this an analysis of positions starting from move 43, rather than of <dumbgai>'s 42. Ne1?

Dec-09-16
Premium Chessgames Member
  ChessHigherCat: I would never have seen it over the board but since it was puzzle I looked for a knight fork and found Nxf3 and if KxN then Qh5#, and if g2xN then Qh2+ followed by inevitable death and destruction, or if 42. RxQ then Nd4+, etc., but in the game line I would have played 48. Nc7 instead of Kf7. Is that a fatal error?
Dec-09-16  Cheapo by the Dozen: I saw that ... Qh1 followed by ... Qg1 was pretty dangerous.

I overlooked the immediate mate after Kxf3.

Dec-09-16  Moszkowski012273: ...NxR also works just not as cleanly.
Dec-09-16  johngalt5579: I thought Nf3 was the first move but then I had to go to work . How did it work out?
Dec-09-16  johngalt5579: after say Bc3 then what?
Dec-09-16  Steve.Patzer: After Bc3, Qh2
Dec-09-16  dumbgai: <beenthere240: <dumbgai> The problem with 42. Ne1 is ...Qxe4+ and white's game collapses.>

42. Ne1 Qxe4+ 43. fxe4 1-0

Dec-09-16
Premium Chessgames Member
  ChessHigherCat: <Clement 41> Sorry, I just scrolled up and saw your post about Nc7, which is what I would have played, too, but it looks really complicated. When you say "it looks to me" does that mean "less good" than the game line or iffy or what?
Dec-10-16  TheBish: M Roeder vs Hebden, 1992 White to play (42...?) "Difficult", material is even.

I may have seen this game or finish before, not sure. It clearly arose from a King's Indian Defense (KID), so it's possible I came across it in one of my books. In any case, a candidate move jumped out at me, and I did not consider another. I believe it has to be right.

42...Nxf3!! threatens Nd4+ and now:

(a) 43. Rxh7 Nd4+ 44. Kd1 Nxb3 and White has two pieces hanging, i.e. 45. Rxb7 Nxa5.

(b) 43. Kxf3?? Qh5# is easy to dismiss.

(c) 43. gxf3? Qh2+ 44. Kd1 g2 and Black will queen next.

(d) 43. Bc3 Qh5! looks really strong, as the knight can't be taken for reasons illustrated in (c).

Any other move allows 43...Nd4+ with a strong attack. I think in most lines Black doesn't want to play ...Nxc7, as after bxc7, the c7 pawn will be a strong threat, and White will also threaten Qxb7.

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