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Alain Alfred Marguerite vs M Siban
Olympiad (2008), Dresden GER, rd 7, Nov-20
Scandinavian Defense: Main Lines (B01)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 33.Rxb8+ PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Jun-13-18
Premium Chessgames Member
  ChessHigherCat: I think 33. Rxb8+ wins, because the King is so exposed and the rooks are so badly coordinated. For example:

33. Rxb8+ Qxb8 34. Qxc6 Qc7 35. Qxd5+ Kc8 36. Qa8+ Qb8 37. Rc1+ Kd7 38. Qd5+ Qd6 39. Qf5+ Kd8 40. Qxh7

Jun-13-18
Premium Chessgames Member
  ChessHigherCat: Black didn't have to make it so easy with 34...Rg6 35. Re8#
Jun-13-18
Premium Chessgames Member
  al wazir: I found 33. Rxb8+ (what else is there?) Qxb8 34. Qxc6, but I wasn't sure whether it wins or just gets a perpetual. Only when I played it out did I see that black has to lose either the ♕, when white chases the naked ♔ into a skewer, or a ♖ from the double threat Qf5+.

34...Rg6 is a kind of suicide; it just puts black out of his misery a little sooner.

Would I have played this line OTB? I'd like to think so.

Jun-13-18
Premium Chessgames Member
  radtop: I don't see how White wins if Black doesn't commit Seppuku.
Jun-13-18
Premium Chessgames Member
  lost in space: What <CHC> said
Jun-13-18
Premium Chessgames Member
  al wazir: 26. Rb1 looks like a winning move too.

If 26...N/e5/Qxe5, then 27. Qb7+ Kd8 28. Qa8+. If 26...Nexc5, then 27. Nxc5 Nxc5 (27...Qxc5 28. Qb7+ Kd8 29. Bc7#) 28. Qb8+ Kd7 29. Qxa7+ Ke8 30. Bd6, etc.

Jun-13-18
Premium Chessgames Member
  ChessHigherCat: <radtop> The real question is how white could possibly lose. I didn't find the sharpest line but it's still crushing (over +13). You're a premium member, look at the engine.
Jun-13-18  Walter Glattke: Less good were 33.Qb7 Qxb7 (Kd7 Re7+!)
34.Rxb7 Nd7 35.Nc5 Nxc5 36.Rb8+ Kd7(c7)
37.Rxg8 or 34.-Kc8 35.Reb1 Nd7 36.Nc5 only little white advantage.

After 35.-Kc8 in the analysis above white can play still 36.Qf5+ and Qxh7 without Qa8+, while 38.Qa8+ Kd7? 39.Qxg8 wins the other rook and brings more desperate continuations, if not defended with 38.-Qb8!

Jun-13-18
Premium Chessgames Member
  patzer2: Black's decisive mistake was 32...Nb8?, allowing today's Wednesday puzzle solution 33. Rxb8 +-.

Instead, 32...Re8 ∓ (-1.17 @ 23 ply, Stockfish 9 analysis of move 34...?) would have given Black the advantage.

Jun-13-18  Cheapo by the Dozen: What <al wazir> said, pretty much. For a Wednesday, this was pretty hard to calculate to the end. But it's easy to see that for giving up the exchange you pawns back and a lot of threats.
Jun-13-18
Premium Chessgames Member
  patzer2: <al wazir: 26. Rb1 looks like a winning move too.> The computer assesses 26. Rb1 = (0.00 @ 24 ply, Stockfish 9 analysis of move 26...?) as equal.

However, the silicon monster does find 26. Rxe4! +- (+7.75 @ 23 ply, Stockfish 9 analysis of move 26.?) to be winning for White.

Jun-13-18  EIDorado: @ChessHigherCat You could shorten your line with 36.Qf5+.
Jun-13-18
Premium Chessgames Member
  agb2002: White is two pawns down.

Black threatens.

The black rooks are defenseless. White can expose the black king with 33.Rxb8+ Qxb8 34.Qxc6:

A) 34... Qc7 35.Qa8+

A.1) 35... Kd7 36.Qxg8 Qa5 (36... Rh6 37.Qxf7+ Kd6 -37... Kc6 38.Rc1+ wins; 37... Kc(d)8 38.Qf8+ and 39.Qxh6- 38.Qf4+ and 39.Qxh6, etc.) 37.Qe8+ Kd6 (37... Kc7 38.Re7+ Kd6 39.Qd7#) 38.Qe7+ Kc6 39.Rc1+ Kb5 40.Rc5+ wins.

A.2) 35... Qc8 36.Qxd5+

A.2.a) 36... Qd7 37.Qa8+ Qc8 (37... Kd7 38.Qxg8 is similar to A.1) 38.Rd1+ Ke7 (38... Kc7 39.Qxa7+ Qb7 -39... Kc6 40.Qb6#- 40.Rc1+ wins) 39.Qe4+ followed by 40.Qxh7 + - [N] and Black cannot play 40... Qc2.

A.2.b) 36... Kc7 37.Rc1+ Kb8 38.Rxc8+ Rxc8 (38... Kxc8 39.Qf5+ and 40.Qxh7, etc.) 39.Nc5 Kc7 (39... Rc7 40.Na6+ Kc8 41.Nxc7, etc.) 40.Qb7+ wins (40... Kd8 41.Qd7#).

B) 34... Qc8 35.Qxd5+ transposes to A.2.

C) 34... f5(6) 35.Qxd5+ followed by 36.Qxg8 wins decisive material.

D) 34... Qb3 35.Qd6+ Kc8 36.Rc1+ Kb7 37.Rc7+ and mate soon.

Jun-13-18
Premium Chessgames Member
  diagonalley: <al wazir> ... me too... (as usual)
Jun-13-18
Premium Chessgames Member
  Once: An interesting puzzle. The first couple of moves are straight-forward and forcing, but then we find ourselves in a GOOT where black has many tries but none work.

After 33. Rxb8+ Qxb8+ 34. Qc6 we get to here:


click for larger view

Black isn't in check and doesn't have a piece en prise. He can play any legal move on the board. But White's latent threat is so strong that no move saves him.

White's most brutal threat is 35. Qxd5+ Kc8/c7 36. Rc1+. Depending on what Black plays he could also bring another piece into the action with Nc6. If the black queen moves off the back rank there are threats of Qa8+ winning the un protected Rg8. If the Rg8 moves off the back rank (as it does in the game) White has Re8#.

And all the while the Rh6 is dangling.

It took me a while to tick through the possible black defences. Perhaps the most tenacious is 35...Qc8 but after 36. Qxd5+ Qd7 37. Qa8+ Qc8 37. Qxa7 we get to another GOOT.


click for larger view

Again Black isn't in check and so has a large number of moves to choose from. But again none of them save him.

The initial combination is fairly simple to spot, but the follow-up is perhaps a little bit complicated for a Wednesday?

Jun-13-18  stacase: Duh! I was looking at 35.Re8+ winning Black's Queen on the skewer (theme of the week) after the King moves out of the way tick tick tick and it dawned it's 35.Re8# (-:

OK I really didn't consider that Black would play 34...Rg6 not because I saw the following mate but just because I didn't look that far. But a good player (White's rating isn't listed but Siban is 2048), I think would have played 35.Re8# instantaneously before Black could tip his King over.

Jun-13-18
Premium Chessgames Member
  Richard Taylor: I couldn't see the exact moves but I could see Rb8+ led to a mate in a few moves. I saw a mate on e8 but it wasn't from Rg6...Now I can't recall. Still mostly the Black K has to go to c8 and then the R on e1 either mates or leads to mate...

Black's King is too exposed and clearly his rooks are not well placed, so the exchange sac works and should lead to mate or an easy win for White.

Jun-13-18
Premium Chessgames Member
  Richard Taylor: It is good to see African players playing chess. Maybe more if their economies improve in some places. Wole Soyinka wrote about the difficulties of those nations due to the arbitrary demarcations by the 19th Century Colonial powers almost literally just drawing a line in the sand and dividing people. But there were and are other problems many face. Chess hopefully to some extent unites people.
Jun-13-18  saturn2: 33 RxNb8 followed by Qxc6 was my first try. Since I found no immediate mate I shifted to 33 Qb7. Since I found the situation even more unclear I settled on 33 RxN. After white's move 34 black has to defend the threats Qxd5 followed by QxRh7 (or Rc1) or Nc5.
Jun-13-18  Mayankk: Another Rook sac, in keeping with the theme for this week. First two moves are instinctive and easy. The Rook sac is not really a sac since White gets at least two extra pawns plus a brutally exposed king with enemy Rooks in helpless territory.

All-in-all one of the easier Wednesdays you will see.

Jun-13-18
Premium Chessgames Member
  malt: Have 33.R:b8+ Q:b8 34.Q:c6 Qc7
(34...Qc8 35.Qf6+ Kd7 36.Re7+ Kd8 37.R:f7+ Ke8 38.Qe7# )

(34...f5 35.Q:d5+ Rd7 36.Q:g8+ Kc7 37.Rc1+ Kb7 38.Rb1+ )

35.Qa8+ Qc8 36.Q:d5+ Qd7 37.Qa8+ Qc8 38.Rd1+ Ke7 39.Qe4+ Qe6 40.Q:h7

Jun-13-18
Premium Chessgames Member
  takchess: Got the first 2 moves didnt see the whole continuation. Also looked at 1.Qa5
Jun-13-18  MrCarciofo: White wins by Nc5 if black doesn't play Rg6. If ...Qc8 then Nb7+.
Jun-13-18
Premium Chessgames Member
  passion pour 64: 33.Rb7 Qd6 34.Qxa7 Kc8 35.Nb6+ wins or 33...Qc8 (instead of Qd6)34.Qa5+ Qc7 35.Qxc7#
Jun-13-18  zb2cr: 33. Rxb8+, Qxb8; 34. Qc6 leaves White in a dominating position, but with no immediately visible mate.
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