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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



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Kibitzer's Corner
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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.

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...

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


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



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...

Premium Chessgames Member
  fm avari viraf: Merry Christmas to 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
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:


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.
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 doesnít have any compensation.

C) 28... Rfe8 29.Nxg7

C.1) 29... Kxg7 30.Qf6+ Kf8 (30... Kg8 31.Bxf7+ Qxf7 Ė31... 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 doesnít look very good) as in line D).

Time to post and check.

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

Merry Christmas to everyone!

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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