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Ruben Pereira vs Frank Schellmann
Olympiad (2008), Dresden GER, rd 7, Nov-20
Sicilian Defense: Lasker-Pelikan. Sveshnikov Variation Chelyabinsk Variation (B33)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Dec-25-08  Utopian2020: Black should have played 28...Rg8.
Dec-25-08  MostlyAverageJoe: <al wazir if 30...Bxf7, then 31. Nxf7+, winning the ♕>

Alas. QxN, BxQ and the position is:


click for larger view

I am sure you'll see that black now wins back the Q, with the same move that could be played immediately after 30. Rxf7.

< If 30...Rb7, then 31. Rxb7 Qxb7 32. Bxg8 wins the exchange>

Better yet, a forced mage (Hiarcs found it, not I):


click for larger view

30...Rb7 31. Qxg6 hxg6 32. Rf3 and its curtains.

Dec-25-08
Premium Chessgames Member
  al wazir: <MostlyAverageJoe: I am sure you'll see that black now wins back the Q, with the same move>

Namely, 32, Rgd8 (or Rbd8)

<that could be played immediately after 30. Rxf7>.

Indeed it could.

Dec-25-08  uniqueid: <MostlyAverageJoe> There are some interesting lines that follow after 28 Rg8

29 Nxg7 Rxg7
30 Rxf7 Rxf7 (if 30..Rd8 31. Qxd8+ Bxd8 32. Rf8+ Rg8 33. Rxg8#) (if 30..Qa8 black is stronger although it might lead to a draw for white) 31 Bxf7 Qxf7 (threatening mate with 32 Qf6)
32 Qxb8+ Qg8
33 Qxb6 leaving White in a stronger position

The better response by Black may be
29 Nxg7 Kxg7, although it will lose the queen. Oh well, 29 Nxg7 is too tempting to ignore...

Dec-25-08
Premium Chessgames Member
  dzechiel: White to move (28?). Material even. "Medium."

Gosh, a lot of candidate moves here. I considered:

- 28 Ng6+
- 28 Bxf7
- 28 b4
- 28 Ra4

but I think I have settled on

28 Ne6

I like this move for a number of reasons. It attacked the rook on f8. The knight cannot be captured because after 28...fxe6 29 Rxf8+ is mate in two. And, it covers d8 nicely, which prevents black from saving his rook by gaining a tempo on our queen.

So, what's black to do? Perhaps

28...Re8

And now white follows up with

29 Nxg7

White is now up a pawn and the threat here is 30 Qf6 with nasty discovered checks. If

29...Kxg7

then

30 Qf6+ Kg8 31 Bxf7+

and the end should be near.

Time to check and see how this went down.

====

P.S. Wishing all of you the very best at this time of year (Christmas at the Zechiel household). D.

Dec-25-08  MostlyAverageJoe: <uniqueid: ... 31 Bxf7 Qxf7>

31...Kg7 and black is OK, with a B for 2P.

Dec-25-08  SamuelS: The most forcing moves are: 28. Qxf8+, 28. Ng6+, 28. Qxb8, 28. Qxb6, 28. Bxf7, 28. Rxa5. It is easy to see that they do not work well. Sacrificing the knight at g6 would work only if Black was forced to take it with the f-pawn. Then the rook at f8 would be lost and a checkmate would follow.

But how about 28. Ne6? Black cannot take it with the f-pawn (the same reason as above) and the rook is threatened. Black cannot do anything nasty with 28...Bxg2+ because of 29. Rxg2. 28...Bc5 or 28...Bc7 do not work because the knight covers c5- and c7-squares. So the rook must move: 28...Rc8 (28...Rg8)
29. Nxg7 Kxg7 (not taking the knight leaves Black in a bad position after 30. Qf6) 30. Qf6+ Kg8 (30...Kf8 31. Qh8+ Ke7 32. Rxf7+ Kd6 33. Qf6+ Kc5 34. Qe5+ Kc6 35. Bb5#) 31. Bxf7+ 31...Qxf7 (31...Kf8 32. Be6+ Ke8 (32. Qf7 Qxf7#) 33. Qf8#) 32. Qxf7+ Kh8 is hopeless
or 28...Re8
29. Nxg7 Kxg7
30. Qf6+ Kg8 (30...Kf8 31. Qh8+ Ke7 32. Rxf7+ Kd6 33. Qf6+ Kc5 (33...Re6 34. Qxe6+ does not change anything) 34. Rxa7 Bxa7 35. Rxa5#) 31. Bxf7+ Qxf7 (31. Kf8 Be6+ 32. Qf7 Qxf7#)
32. Qxf7+ Kh8 and the situation is not any better for Black or 28...Rg8
29. Rxf7 Qxf7
(29...Qa8 30. Rxg7 Rxg7 (not taking does not save Black) 31. Nxg7 Kxg7 32.Qf6# or 29...Rb7 30. Rf8 Rb8 31. Rxg8+ Rxg8 (31...Kxg8 32. Nd8+ Kh8 33. Qf8#) 32. Ng5) 30. Ng5 Qe8
31. Nf7+ Qxf7
32. Rxf7 and Black is behind in material

So I think the solution is 28. Ne6! and the the variations above show that Black cannot find a good defence. I haven't look at the solution yet, so let's see...

Dec-25-08
Premium Chessgames Member
  fm avari viraf: Merry Christmas to Chessgames.com as well as to all our Chess lovers! Hope, the New Year brings Peace, Love, Prosperity & Happiness on earth.
Dec-25-08  njchess: Ne6 seems to be the only winning move. Black is sunk if he plays fxe6 or later, Kxg7. My guess is he took the knight, otherwise it wouldn't be a puzzle position! Merry Christmas everyone!
Dec-25-08  newzild: Took me a wee while because I tried to make 28.Ng6+ work, but was foiled by the Be4.
Dec-25-08  newzild: Yes, have a merry Christmas morning, a great afternoon, and a good knight.

It's almost boxing day here already.

Dec-25-08  JG27Pyth: I had 28.Ne6 Rf8 29.Ng5 which isn't as good as the text, but I think the attack against f7 will yield material...

Remarkable how black had no good answer whatsoever to the relatively (for a problem, anyways) unforcing Ne6.

Dec-25-08  SufferingBruin: Ne6 and Happy Holidays!
Dec-25-08  5hrsolver: If black plays 28...Rg8
There is this interesting line
29.Ng5 Bg6 30.Rxf7 Qa8 31.Qxg6 hxg6 32.Rf4 and mate on the h file
Dec-25-08
Premium Chessgames Member
  whiteshark: Got the first two moves and thought it's m.o.o. all over.

Best season's greetings to all of you!

Dec-25-08  JG27Pyth: I don't see a clear win for white if (following the text Ne6 Rfe8 Nxg7 Bc5 Qf4) Black just declines 30...Kxg7 and instead plays:

30....Rg8

what is White's best continuation from there? The obvious --

31.Qxe4 Rxg7 doesn't seem adequate to me... it gives Black some drawing hopes... Black can double his rooks on the g-file and yes he's going to be down at least a pawn but with opposite color bishops he can still afford to exchange Queens and Rooks with some hope of drawing.

(P.S. Merry Christmas Happy Holidays etc.)

Dec-25-08  Eduardo Leon: I think it's Ne6, but I can't find a clear winning line.
Dec-25-08
Premium Chessgames Member
  agb2002: White can try to exploit the pinned pawn on f7 and the weakness of the black castle with 28.Ne6:

A) 28... fxe6 29.Rxf8+ Rxf8 30.Qxf8 mate.

B) 28... Bxg2+ 29.Rxg2 and Black doesn’t have any compensation.

C) 28... Rfe8 29.Nxg7

C.1) 29... Kxg7 30.Qf6+ Kf8 (30... Kg8 31.Bxf7+ Qxf7 –31... Kf8 32.Be6+ and mate next- 32.Qxf7+ winning) 31.Bxf7 winning.

C.2) 29... Red8 30.Qf6 Kg8 31.Bxf7+ winning.

C.3) 29... Qc7(e7) 30.Nxe8 wins the exchange at least.

C.4) 29... Bc5 30.Qf6 Be7 (30... Qe7 31.Nxe8; 30... Q(R)b6 31.Ne6+) 31.Qe5 f6 32.Qxe4 Kxg7 33.Qg4+ Kh8 34.Rd2 and White has a considerable advantage.

D) 28... Rg8 29.Ng5

D.1) 29... Rgd8 30.Qxd8+ R(B)xd8 31.Nxf7+ Kg8 32.Nxd8+ Qf7 (32... Kh8 33.Rf8 mate) 33.Nxf7 winning.

D.2) 29... Rbd8 30.Qxb6 winning a piece.

D.3) 29... Bg6 30.Bxf7 Rgd8 31.Qe6 with advantage.

E) 28... Rfc8 29.Ng5 (29.Nxg7 Rxc4 30.Qf6 Bd4 31.cxd4 Qxd4 doesn’t look very good) as in line D).

Time to post and check.

Dec-25-08
Premium Chessgames Member
  agb2002: I found 29... Bc5 but preferred 30.Qf6 to 30.Qf4. I'll investigate this later.

Merry Christmas to everyone!

Dec-25-08
Premium Chessgames Member
  DarthStapler: I at least considered the first move but I picked Bxf7
Dec-25-08  5hrsolver: < JG27Pyth: I don't see a clear win for white if (following the text Ne6 Rfe8 Nxg7 Bc5 Qf4) Black just declines 30...Kxg7 and instead plays: 30....Rg8>

30...Rg8 31.Nh5 Qe7 32.Qf6+ Qxf6 33.Nxf6 wins at least the exchange

Dec-25-08  Helios727: What happens after 31... Kg8 ?
Dec-25-08  RandomVisitor: In this game, black's problems started with 25...Bb6.

If he had played either 25...a4 or 25...Qc5:

1: Rub Pereira - F Schellmann, 2008 Olympiad 2008


click for larger view

Analysis by Rybka 3 : <16-ply>

1. = (0.00): 25...a4 26.bxa4 Bf6 27.Nd5 Be6

2. = (0.04): 25...Qc5 26.Bd5 Bf6 27.Ne2

Dec-25-08  jovack: good puzzle
easy yet plenty to think about
Dec-26-08  MostlyAverageJoe: < JG27Pyth: ... Remarkable how black had no good answer whatsoever to the relatively (for a problem, anyways) unforcing Ne6 >

But he did: Rg8. The rest of the line is shown here: R Pereira vs F Schellmann, 2008

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