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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 2 OF 2 ·  Later Kibitzing>
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.
Jun-13-18  mel gibson: Easy today.
Black is left completely exposed.
Jun-13-18  saturn2: <passion pour 64: 33.Rb7> NxQ
Jun-13-18
Premium Chessgames Member
  chrisowen: Gabus vints ginus keyins lunksus rb8us bullrushy lunksus qb8us bullshine lunks qc6us cuffins lunks rg6us guffleg keyus lunks its hive 34Rg6 fabus kestrel eeljugs lunks huffleg 6 7 dunes ebber keyins gabus bagus tinks riven iffys fives keyin focus watch choose lovely keyin puddle dacquiri mental it's vasts vivas flavs ivans hopes jastha lawus lawon it's vasts keyins paint inept joops vivas flavs wealth thans vipus keyom jowls janus whips lunksus rb8us bullrushy keyins gabus bagus tinks krypton factor yinus fives riven focus chows choose lovely keyin puddles dacquiri mental it's vasts vivas flavs ivans hopes jastha lawus lawon keyin lunks its bin 33.Rxb8+ kestrel mobys lunksus bullrushy 6 dunes ebber bivvy keyin bumus bubble blues becks bucks cubus cubes lunksus rb8us bullrushy bullshine butchever chink flush flesh hubus feeble lunks its by 32Nb8 kestrel dudus hunts bivvy dutch hoods keyins,

lunksus bullshine
6 dunes ebber lunks its et,

32Re8 keens kestrel keyin eggluft dutch hoods keyins lunksus erstwhile 1 2 it oinks keyin flubb bivvy belfry huffs blush hulls hubus beeches lunks its bin 33Qxb8 34.Qxg6 Rg6 kestrel eeljugs lunks guffleg lunks its hive 34Rh6 kestrel fabus eeljugs lunks huffleg 6 7 dunes ebber mamas keyin mumps muses remember felly mends level evermore bullshine fleck bents belts bunts tubby keyin butty butes blush beech bucks becks hubble moots chump check bends buddy cuddles ducks decks umsus clung duffs aquas kongs mends dives keyins gabus lunksus rb8us bullrushy,

Jun-13-18
Premium Chessgames Member
  Jimfromprovidence: Side puzzle. If black's h rook is on h8 instead of h7, does 33 Rxb8+ still work?


click for larger view

Jun-13-18
Premium Chessgames Member
  Marmot PFL: 33 Rxb8+ Qxb8 34 Qxc6 and Qxd5 seems like it should win, at any rate white has almost endless threats, for instance 34...Qc8 35 Qxd5+ Qd7 36 Qa8+ Qc8 37 Qxa7 (threatens Qe7# and allows Nb6) Qd7 38 Qa5+ Kc8 39 Nb6+
Jun-13-18
Premium Chessgames Member
  patzer2: <Jimfromprovidence: Side puzzle. If black's h rook is on h8 instead of h7, does 33 Rxb8+ still work?> Yes it does.

The moves 33. Rb2 Rhh8 34. Rxb8 +- (+5.20 @ 24 ply, Stockfish 9 analysis of move 34...?) transpose to 33. Rxb8 +- in your puzzle position (i.e. with the h Rook on h8).

Jun-13-18
Premium Chessgames Member
  Jimfromprovidence: This what I was going for with my side puzzle.

Here is the text position after 34...Rg6, where black resigns because of the pending 35 Re8#


click for larger view

Here is the text position except with the h rook on h8 (after 33 Rxb8+ Qxb8 34 Qxc6 Rg6).


click for larger view

So the question is if white still wins even though 35 Re8 now loses for white.

The answer is yes. One way is after 35 Qxd5+ Rd6 36 Qe5!


click for larger view

Here white threatens both 37 Qe7+ and 37 Qxh8 and black cannot prevent both threats.

Jun-14-18
Premium Chessgames Member
  Penguincw: Going back in time, solving the Wednesday puzzle after the Thursday puzzle.

I got that exchange sac, but nothing else. Not sure if solving this puzzle would lead me to bother with Thursday.

Black realizes their last move blunder, and resigns immediately. <cg> doesn't have a rating for white, so who knows? Maybe they slip. But even playing 35.Qe8+ results in mate, just a few moves longer.

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