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Viktor Antonovich Bologan vs Mads Smith Hansen
European Rapid Championship (2011), Warsaw POL, rd 5, Dec-17
Alekhine Defense: Modern Variation. Main Line (B05)  ·  1-0
ANALYSIS [x]

FEN COPIED

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sac: 34.Rxd5 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jan-10-19  dTal: I actually think this is a decent Thursday puzzle, because of 34 ... b5 that Nalin first mentioned. I think White has to settle for 35. Rc5 bc4 36 Rc4 with a passer and extra pawn. Or does he have anything better?
Jan-10-19  hiatusboy: nice solution :)
Jan-10-19  Cheapo by the Dozen: What the others said. When a puzzle seems too easy to me, that usually indicates I'm overlooking a defense, and in this case that defense was 34 ... b5.
Jan-10-19  Cheapo by the Dozen: That said, 35 Rc5 wins a pawn straightforwardly, and is liked by the engine as well.
Jan-10-19
Premium Chessgames Member
  malt: Black would have to play
36...R:g2+ 37.Kf1 Rg1+ 38.K:g1 Rg8+ 39.Kf2 Ke8
a piece down.
Jan-10-19
Premium Chessgames Member
  agb2002: White can take advantage of the poor position of the black king and pieces with 34.Rxd5:

A) 34... cxd5 35.Nb6+ Kd8 36.Rc1 and 37.Rc8#.

B) 34... e4 35.Nb6+ Kd8 36.Ra5 and 37.Ra8#.

C) 34... b5 35.Rc5

C.1) 35... bxc4 36.Rxc4 wins a pawn.

C.2) 35... Kd7 36.Bxe5

C.2.a) 36... bxc4 37.Bxh8 Rxh8 (37... Kd6 38.Bd4) 38.Rxc4 + - [2P].

C.2.b) 36... Bxe5 37.Nxe5+ Kd6 38.Nd3 Re3 39.Rc3 b4 (39... Kd5 40.Nb4+ Kd4 41.Rxe3 Kxe3 42.Nxc6 wins

decisive material) 40.Rb3 c5 41.Rd1 Rge8 42.Nc1 wins decisive material.

D) 34... e4 35.Nb6+ Kd8 36.Rc1 + - [N] (36... cxd5 37.Rc8#).

Jan-10-19
Premium Chessgames Member
  agb2002: I saw 34... b5 but missed <malt>'s 36... Rxg2+ to clear e8 for the king with tempo, although Black is already lost.
Jan-10-19  Mayankk: At my level of play, I am happy as long as I can see the main sequence even if I dont notice all the stubborn defenses or side-lines.

So in this case the main line jumps in a flash, mainly because it is just so tempting to sacrifice your Rook. After that you just have to see that the King indeed cant escape after Rc1.

Jan-10-19  WDenayer: Not too difficult. It's sad, but it seems that the variation with 4. ...Bg4 doesn't work. It seems that all variations after 4.Nf3 give White an advantage. It seems difficult or impossible for Black to equalise.
Jan-10-19
Premium Chessgames Member
  thegoodanarchist: My brain wanted to open the a-file somehow.

I could not convince it to look elsewhere. Too early in the AM for that.

Jan-10-19
Premium Chessgames Member
  ChessHigherCat: White is still winning after 34...b5 but I think you guys are underestimating how tricky it is:

<1) +2.36 (22 ply) 34.Rxd5 b5 35.Rc5 bxc4 36.Rd1 e4 37.Rxc6+ Kb7 38.Rc7+ Ka8 39.Rd5 Rg5 40.fxe4 Rxd5 41.exd5 Rd8 42.Bf4 Bd4+ 43.Kf1 Rxd5 44.Rxc4 Be5 45.g3 Bxf4 46.gxf4 Rh5 47.Kg2 Kb7 48.Rc2 Kb6 49.Kg3 Ra5 50.Rc4 Kb7> etc.

Jan-10-19  5hrsolver: This wasn't easy for me at all. For a while there I didn't picture in my mind the opening of the c file after the sac 43.Rxd5 cxd5 44.Nb6+ and that white could take advantage of this. Probably because initially a white knight and black pawn where on the c file.
Jan-10-19  5hrsolver: I mean

34.Rxd5 cxd5 35.Nb6+

Jan-10-19  AlicesKnight: Found it. Extraordinary that there is no escape route once Black takes the R.
Jan-10-19  Abdunnaser: Got it
Jan-10-19  JohnBoy: Very nice puzzle. Not difficult, just a bit unexpected... a back-rank mate in the middle of the 8th.
Jan-10-19  Walter Glattke: 34.-b6 35.R5d1 e4 36.Nxb6+ Kb7 37.Rab1 exf3 not so easy
Jan-10-19  Eduardo Leon: I'm seriously out of practice. The first couple moves were kind of obvious:

<34.♖xd5 cxd5 35. ♘b6+ ♔d8>

Here I spent a couple minutes trying to figure out how white's remaining rook should infiltrate through the d file. This was the position in my mind:


click for larger view

Only then did I realize that, at this point, the c file is open, not the d file. In other words, the position is actually this:


click for larger view

Thus...

<36.♖c1>

... and mate is unavoidable.

Jan-10-19
Premium Chessgames Member
  Marmot PFL: All forced moves and therefore not too difficult, but a good mating pattern to remember.
Jan-10-19  eyalbd: Easy.

♖xd5, ♘b6, ♖c1

Jan-10-19  devere: After 34.Rd5! b5! White has to work for the win.

SF 10 64 BMI2 depth 53 gives 35.Rc5 bxc4 36.Rd1 e4 37.Rxc6+ Kd7 38.Rxc4 exf3 39.Bg3+ Ke7 40.gxf3 Ra8 41.Re4+ Kf8 42.Rd6 Kf7 43.Rd7+ Kf8 44.Rf4+ Ke8 45.Rh7 Ba1 46.Re4+ Kf8 47.Rxh6 Ra5 48.Kf2 Kf7 +4.3


click for larger view

White has 3 extra pawns, but still has work to do for the win.

Jan-10-19
Premium Chessgames Member
  ChessHigherCat: <Marmot PFL: All forced moves and therefore not too difficult, but a good mating pattern to remember.>

Welcome back Marmot! That's what I thought, too, but <GSM> pointed out a (rather far-fetched) escape route in that line:

34. Rxd5 cxd5 35. Nb6+ Kd8 36. Rc1 Rxg2+ 37. Kxg2 Rg8+ 38. Kf1 Ke8

Game over in any case.

There's also a better defense 34...b5 (see above)

Jan-10-19  Articalplayer: I can't remember when I last got a Thursday... it feels so good.
Jan-10-19
Premium Chessgames Member
  ChessHigherCat: <Gregor Samsa Mendel: I think black can avoid mate after 36..Rxg2+ but is dead lost anyway>

You're right of course. I looked at 36..Rxg2+ in that line but wrongly assumed that it was no good because the white king could stay off the g-file. In fact, the black king is forced to either go the g-file or lose his own rook:

34.Rxd5 cxd5 35.Nb6+ Kd8 36.Rc1 Rxg2+ 37.Kf1 (Kh1 38. Rg1+ Kxg1 39. Rg8+) 38. Rg1+ Ke2? 39. Rxc1

Jan-10-19  Otoy: I got this one like a pro, on my own. I think I do have a blood of a GM.
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