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Yuri S Razuvaev vs Hans Ree
Amsterdam IBM (1975), Amsterdam NED, rd 2, Jul-09
Sicilian Defense: Scheveningen Variation. Keres Attack (B81)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Sep-24-09
Premium Chessgames Member
  chrisowen: Lash in the knight. We'd play Nf6 thinking it was the selection that keeps him zipped up. I understood the Nxh7 rim shot wins a second pawn except wasn't sure of the gxf6 follow through. I'm giving myself half marks getting it right.
Sep-24-09  zanshin: I was looking at <27.Bh6 gxh6 28.g7+ Kg8 29.Nf6#>


click for larger view

But Rybka says Black doesn't have to take the Bishop .. oh well, better luck tomorrow (maybe).

Sep-24-09  Marmot PFL: Well at least black finally got the white knight off d5... Sooner is better i have found and best is not to let it go there at all if possible. I found the Nf6 move but didn't expect black to just resign, but his position is very bad as the king is defenceless once h7 falls.
Sep-24-09
Premium Chessgames Member
  doglikegroove: <(everybody) 27... gxf6 28.g7+ Kg8 29.Bh6 followed by gxf8=Q#.>

I'm at work and losing my mind. Where did the queen on e8 go?

Sep-24-09
Premium Chessgames Member
  YouRang: I found 27.Nf6 pretty readily. It can't be taken since 27...gxf6 28.g7+ Kg8 29.Bh6! is an unstoppable mate threat.

But even if black doesn't take it (i.e. moves his queen to safety), then I have 28.Nxh7 (winning a pawn and attacking the rook), which looks winning: e.g. 27...Qc6 28.Nxh7 Rfd8 29.Rfd8 Ng5 (threatening check at f7 and winning another pawn and the exchange).

Sep-24-09
Premium Chessgames Member
  doglikegroove: <<(everybody) 27... gxf6 28.g7+ Kg8 29.Bh6 followed by gxf8=Q#.>

I'm at work and losing my mind. Where did the queen on e8 go?>

Duh. Discovered check.

Coffee. Coffee!

Sep-24-09  mworld: wow, that discovered mate was incredibly hard to see even after i was looking for it from reading the above...if you dont see it, it seems like Nf6 leads no where. Great move!
Sep-24-09
Premium Chessgames Member
  doubledrooks: I went with 27. Nf6, seeing 27...gxf6 28. g7+ Kg8 29. Bh6 and 30. gxf8=Q# next.

If 27...Qd8, then 28. Nxh7 Re8 (or Rg8) 29. gxf7 and white gets the exchange back and emerges two pawns up with a strong position.

However, in my analysis of possible queen moves on move 27, I missed 27...Qe7 as a possibility. I did see 28. Nxh7 Rd8 29. Ng5 upon other queen moves (such as 27...Qb5), however, so I would have gone with that OTB.

Sep-24-09
Premium Chessgames Member
  patzer2: For today's Thursday puzzle, Black's acceptance of White's sham Knight sacrifice offer of 27. Nf6! leads to a decisive double discovered check and mate after 27... gxf6 28.g7+ Kg8 29.Bh6! (30 gxf8# or 31. gxf8# will quickly follow).

Black can avoid this possibility with 27...Qe2, but after 28. Nxh7 Re8 29. Ng5! Black's weakened castled position looks hopeless. See <agb2002>'s post.

Sep-24-09
Premium Chessgames Member
  agb2002: Another game with a demolishing Nf6 is Kasparov vs Karpov, 2009, played two days ago.
Sep-24-09  VincentL: I thought 27. h6 was the solution here.

If 27. gxh6 then 28. f7+ etc.
If 27. hxg6 then 28. hxg7+ Kxg7 29. f6+ Kg8 30. Nxb6 Bxb6 31. Qh4 and mate follows

If 27. fxg6 28. hxg7+ Kxg7 29. f6+ Kf7 30. Qh4 leads to mate I think

If 27. Qd7 28. hxg7+ Kxg7 28 f6+ and the black queen is lost.

Sep-24-09
Premium Chessgames Member
  Sneaky: The hardest part about this puzzle is figuring out what happens if the sacrifice is declined, with say ...Qd8 or something. I think then the attack continues with Nxh7 or even h6.

Somebody just asked "what about f6 to kick the attack off?"

Good question. That's the first move I looked at, too. I think the problem then is this: say 27.f6 fxg6 I assume you intended to continue 28.hxg6, then Black has ...Qxg6 and what has White really got? Not much. Maybe White has the better game after 27.f6 (or after a number of moves!) but without 28.Nf6! you're not going to get Black to resign on the spot.

Sep-24-09
Premium Chessgames Member
  DarthStapler: Got it
Sep-24-09  dhotts: I believe the crushing line is 27.Bh6! Rg8 28.f6 and Black is toast.
Sep-24-09  Patriot: <<dhotts>: I believe the crushing line is 27.Bh6! Rg8 28.f6 and Black is toast.>

After 27.Bh6, why not 27...Nxd5?

Sep-24-09  wals: 26....Nb6 instead of Rc6 was a case of look Mum no Hans.
Sep-24-09  WhiteRook48: I just guessed, but I got it correct
Sep-24-09  TheBish: Razuvaev vs H Ree, 1975

White to play (27.?) "Medium"; Black is up an exchange for a pawn.

Candidate moves: f6, h6, Bh6, Nh6

Of these, all but one allows a defense with 27...fxg6. Therefore...

27. Nf6!

As is often the case, the most forcing move works. Now:

A) 27...gxf6? 28. g7+ Kg8 29. Bh6! and Black is helpless against 30. gxf8=Q(R)#. Beautiful example of the power of the double check.

B) 27...Qe7 28. Nxh7 and White has a strong attack, e.g. 28...Rg8 29. Ng5 (or 29. f6) Rgf8 30. f6! Qd7 (or 30...gxf6 31. g7+ Kxg7 32. Ne6+ mates) 31. fxg7+ (31. Rf5 is also good) Kxg7 32. h6+! Kg8 33. Qxd7 Nxd7 34. g7 Rfe8 35. Rxf7 Nf8 (forced) 36. Bh3! Nh7 37. Rb7! Nxg5 38. Bxg5, and with the threat of 39. Bf5 and 40. h7#, Black has nothing better than 38...Rc6 39. Bd7 Rg6 40. Bf5! and the end is near, i.e. 40...Rxg5 41. h7# or 40...Ree6 41. Bxe6 Rxe6 42. Rb8+.

There are other queen moves on move 27, but the ideas for White are the same -- attack! In the interest of time, it's time to see the game!

Sep-24-09
Premium Chessgames Member
  fm avari viraf: There are many tempting moves but I would opt for 27.Nf6 since after 27...gxf6 28.g7+ Kg8 29.Bh6 & mate to follow. Therefore, the capture of Knight is not possible & hence Black will have to move his Queen to 27...Qd8 28.Nxh7 Re8 29.Ng5 with multiple threats & Black will succumb.
Sep-24-09
Premium Chessgames Member
  OBIT: <Patriot> After 27. Bh6 Nxd5 28. Bxg7+ Kxg7 29. h6+ and now:

29...Kf6?? 30. Qh4#

29...Kg8?? 30. gxh7+ followed by 31. Qg7#

29...Kxh6 30. Qh4+ Kg7 31. f6+ Nxf6 (or 31...Kxg6 32. Qg4+ Kh6 33. Qg7+ Kh5 34. Bf3+ Kh4 35. Qg4#) 32. Qxf6+ Kg8 33. gxh7+ Kxh7 34. Rf5 and mates

29...Kh8 30. g7+ Kg8 31. gxf8=Q+ Kxf8 32. Qg7+ Ke7 33. Qxe5+ Kf8 34. Qxd5 leaves White two pawns up.

I've been analyzing 27. Bh6, and it looks like it also wins. I'll post more analysis later - need to leave for a few hours.

Sep-24-09
Premium Chessgames Member
  gofer: <Patriot>

27 h6 Nxd5
28 hxg7 ...

28 ... Kg8 29 gxh7+ Kxh7 30 Qh5+ Kxg7 31 Qh6+ Kg8 32 f6 Nxf6 33 Rxf6 winning easily as Qg5+ Rh6# are coming

28 ... Kxh7 29 gxh7+ Kh8 (Kxh7 leads to continuation as above) 30 Bh6 Rg8 31 hxg8Q+ Qxg8 32 Qxg8+ Rxg8 33 exd5 winning

So 27 h6 Nxd5 is a win for white.

Sep-24-09
Premium Chessgames Member
  johnlspouge: Thursday (Medium):

Razuvaev vs H Ree, 1975 (27.?)

White to play and win.

Material: Light-square B+P for R. The Black Kh8 has 1 legal move, g8, which the White Nd5 can reach in 2 moves. The White Nd5 also mutually attacks Nb6, so it is in some danger of immediate exchange, although the resulting passed Pd5 is powerful. White has an advanced and mobile P chain on light squares near the Black Kh8, backed by Bc1, Rf1, and Qg5. The White Bg2 requires activation. The White Kh2 is secured from check.

Candidates (27.): h6, f6, Nf6

27.Nf6 (threatening 28.Nxe8 or 28.Nxh7 winning a critical P)

27gxf6 28.g7+ Kg8 29.Bh6 (threatening 30.gxf8=Q+#)

Black cannot move Rf8, so he is finished.

I spent far too much time on 27.f6 and 27.h6, but as <TheBish> points out, 27...fxg6 defends adequately against both.

Sep-24-09
Premium Chessgames Member
  OBIT: A few more possibilities after 27. Bh6 (27...Nxd5 is analyzed above):

27...f6 also loses to 28. Bxg7+ Kxg7 29. h6+. This one is easier than 27...Nd5, as the lines all end in quick mates: 29...Kxh6 30. Qh4+ Kg7 31. Qxh7# or 29...Kh8 30. g7+ Kg8 31. gxf8=Q+ Kxf8 32. Qg7#

After 27...Rg8, I like 28. f6, which <dhotts> also suggests. The main point of f6 becomes evident after 28...Qf8 29. fxg7+ Rxg7 30. Bxg7+ Qxg7 31. Rxf7. The defensive try 28...fxg6 had me thinking awhile, until I noticed 29. f7 Qc6 30. fxg8=Q+, and if White has nothing better, he can move his bishop on his next turn and be a piece up.

The toughest defense after 27. Bh6 seems to be 27...fxg6 28. hxg6. Now 28...hxg6 29. fxg6 Rxf1 30. Qh5! gives White a mating net, the threat being Bg5+ followed by Qh7+ and Qh8#. However, a better defensive try is 28...Nxd5. I'm, um, still working on that one. :) For sure, there are a lot of ideas in this position, both for the attack and the defense.

Sep-24-09
Premium Chessgames Member
  OBIT: Back to 27. Bh6 fxg6: OK, since Nxd5 bothers me, why don't I do the trading and play 28. Nxb6! Bxb6 29. hxg6. Now this position I really like - I have Qh5 to build on my attack, while 29...gxh6 30. g7+ Kg8 31. gxf8+ Kxf8 32. Rf3 looks very good for White.

I'm at least 90% certain that 27. Bh6 wins. As for 27. h6, it's not as good - the pawns on h5 and f5 need to support the g6 pawn until the push to h6 or f6 does something constructive.

Sep-25-09
Premium Chessgames Member
  kevin86: Some thing,but at a higher level than yesterday.
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