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Vladimir Potkin vs Daan Brandenburg
Bundesliga (2008/09), Various GER, rd 6, Nov-30
Benko Gambit: Accepted. Fianchetto Variation (A58)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Apr-12-18
Premium Chessgames Member
  ChessHigherCat: I think it must be 37. Qxe5+ Kxh6 (...Kh7 38. Be4+ Kxh6 39. Qg5#) 38. Qg5+ Kh7 39. Qf5+ Kh8 40. Be4

I looked at Qe5+ right away because an enormous number of mates begin by forcing the K to take a knight for some reason.

Apr-12-18
Premium Chessgames Member
  ChessHigherCat: I found a better defense for black where white just wins the queen:

37. Qxe5+ f6 38. Qh5 Qe1+ 39. Kh2 Qxf2 40. Nf5+ Kg8 41. Qg6+ Kh8 42. Qxf6+ Kg8 43. Nh6+ Bxh6 44. Qxf2

Apr-12-18
Premium Chessgames Member
  Penguincw: Normally I disappear from POTW by this time of the week, but I came close yesterday. Maybe I'll get today too?

Uh, no. I got the first move of 37.Qxe5+ Kxh6 right. I was planning to follow up with 38.Be4, setting a mating net, but I missed 38...Qe1+ 39.Kg2 <Qf1+>. Even if that weren't the case, my plan might not work out.

I'll probably be gone tomorrow then.

Apr-12-18
Premium Chessgames Member
  patzer2: Got the first two moves 37. Qxe5+ Kxh6 38. Qf6+ +- in attempting to solve today's Thursday puzzle.

However, I was content after 38...Kh7 to simply regain the piece with 39. Qxa6 ± to +- (+2.09 @ 24 ply, Stockfish 9 analysis of move 39...?).

Better is White's deep winning follow-up 39. Qxf7+ +- (+3.69 @ 22 ply, Stockfish 9 analysis of move 39...?).

P.S.: For a Black improvement I'd avoid the Benko gambit against strong players as it's so heavily analyzed you're playing prep or the computer for much of the game, and the computer analysis strongly favors White.

Even so, in this game, Black could have improved over 21...Re8? (potentially allowing 22. Ne2 +-) with 21...c4 ±.

Apr-12-18
Premium Chessgames Member
  NM JRousselle: This was too easy. Solutions that involve a series of checks are often easy to solve.
Apr-12-18
Premium Chessgames Member
  agb2002: White has a bishop, a knight and a pawn for the bishop pair.

Black threatens Kxh6.

White can attack the black king with 37.Qxe5+:

A) 37... Kxh6 38.Qf6+ (38.Be4 Qe8+) 38... Kh7 (38... Kh5 39.Qg5#) 39.Qxf7+ (39.Qxa6, with two extra pawns, looks slower) 39... Bg7 (39... Kh6(8) 40.Qf6+ and 41.Qxa6 + - [3P]) 40.Qf5+ (the queen protects the f-pawn with tempo) 40... Kh8 (40... Kh6 41.Be4 wins; 40... Kg8 41.Qe6+ and 42.Qxa6 + - [3P]) 41.Be4 Kg8 42.Qe6+ and 43.Qxa6 + - [3P].

B) 37... Kg6 38.Be4+ f5 (38... Kxh6 39.Qh8#) 39.Bxf5+ Kh5 40.Be4+ Kxh6 41.Qh8#.

C) 37... Kh7 38.Be4+ as in B.

D) 37... f6 38.Qh5

D.1) 38... Qe1+ 39.Kh2 Qxf2 40.Nf5+ Kg8 41.Qg6+ Kh8 42.Qxf6+ Kh7 (42... Kg8 43.Ne7+ and 44.Qxf2) 43.Qf7+ Kh8 44.Qxf8+ Kh7 45.Qg7#.

D.2) 38... Bd3 39.Nxg4 + - [N+3P vs b].

Apr-12-18
Premium Chessgames Member
  agb2002: I meant 38.Be4 Qe1+ in my line A, which I made more difficult with 41.Be4, exposing the bishop although this also wins, than it really is (after 43.Qxe6 Black has 43... Qxe4).
Apr-12-18  WorstPlayerEver: I quickly figured out it must be a draw. 41... Kg8 42. Qe8+ Qf8 43. Qe6+ Qf7 44. Qxa6 Bd4


click for larger view

I don't see how White can win here.

Apr-12-18  Walter Glattke: Worst: White has 3 pawns more, but it is a Tartakower fail (resign too eally), and, a normal Club Player would take 37.QxQ BxQ 38.Nxg4 with two pawns more and no Counter Play for black, so better than your diagram, where winning is difficultier.
Apr-12-18  WorstPlayerEver: According to SF I missed this line 37. Nf5+ Kf6 38. Qd8+ did not see 38... Be7 fails here because of 39. Qh8+

And this one: 37. Nf5+ Kg8 38. Qxe5 Bc8 39. Ne3 Qe7 40. Qf4 Bg7 41. Be4 Qe5 42. Bf5 Qxf4 43. gxf4 Bb7 44. d6 Bf3 45. Bxg4

<Walter Glattke> Yes, your line seems to win also. Bit of a tricky puzzle today.

Apr-12-18
Premium Chessgames Member
  gofer: Well, if I was being chicken I would play 37 Qxb4 Bxb4 38 Nxg4 and fully expect to win the end game. But it seems we have more on offer. This may be true, but I don't think its massively more...

<37 Qxe5+ ...>

Running isn't an option...

37 ... Kh7???
38 Be4+ f5 (Kxh6 Qg5#)
39 Qxf5+ mating

39 ... Kxh6/Kh8 40 Qh7#
39 ... Kg7 41 Qg6+ Kh8 42 Nf7#/Qh7#

Taking the knight is flawed due to a forced combination of queen checks...

37 ... Kxh6
38 Qf6+ Kh7
39 Qxf7+! Bg7
40 Qf5+! Kh8
41 Qh5+ Kg8
42 Qe8+ Bf8 (Kh7? Be4+ +-)
43 Qe6+ Kh8
44 Qxa6+


click for larger view

<37 ... f6>
<38 Nf5+ ...>

38 ... Kh8
39 Qxf6+ +-

39 ... Kg8
40 Qe6+ transposes to one of the lines above.

38 ... Kf7
39 Qe6+ 39 Kg6 transposes to playing Kg6 immediately

So all the lines more or less transpose to the following...

38 ... Kg6
39 Qe8+!!! ...

39 ... Kxf5
40 Qh5#


click for larger view

39 ... Kh7
40 Qf7+ Kh8 (Bg7 Qxg7#)
41 Qxf6+ Kh7/Kg8
42 Qxa6 +-

The only sensible defence seems to be one that leaves black with no defensive pawns around its king.

<38 ... Kh7>
<39 Qf6 +->


click for larger view

~~~

Can black defend this!?!? Bxa6 is lose and white threatens d6 disconnecting Bf8 from the protection of Qb4. Trying to take Pf7 (with Qe1+) loses tempo. It all looks horrible!

Apr-12-18  mel gibson: I saw the first few moves.
I only have SOS 5.1 for Arena
where I am, with an old laptop.
It says:

37. Qxe5+

(37. Qxe5+
(♕b8xe5+ ♔g7xh6 ♕e5-f6+ ♔h6-h7 ♕f6xf7+ ♔h7-h8 ♕f7-f6+ ♔h8-h7 ♕f6xa6 ♗f8-c5 ♕a6-e6 ♔h7-h8 ♕e6-e5+ ♔h8-g8 d5-d6 ♗c5xd6 ♗g2-d5+ ♔g8-h7 ♗d5-e4+ ♔h7-g8 ♕e5-g5+ ♔g8-h8 ♕g5-h5+ ♔h8-g8 ♕h5xg4+ ♔g8-h8 ♔g1-h2 ♕b4-d2 ♕g4-h5+ ♔h8-g8 ♕h5-e8+ ♗d6-f8) +4.96/19 270)

score for White +4.96 depth 19

Apr-12-18  et1: In the final position what would follow up ? Kg8 and Q takes pawn, four pawns for a bishoo, game over ?
Apr-12-18  dTal: I'm sorry what?? Surely Black could play on?
Apr-12-18
Premium Chessgames Member
  Breunor: Black is lost at the end.

41 ... Kg8 42 Qe8 ch

If 42 Qf8 then 43 Qe6ch picking up the bishop on a6.

If 42 Kh7 then 43 Be4ch Kh6 Qg6 checkmate.

Apr-12-18
Premium Chessgames Member
  Breunor: Sorry WorstPlaterEver, I missed your note. You have in the line above after 42 Qe8ch Qf8 43 Qxa6 Bd4.

This is beyond my abilities, I plugged it into Stockfish and this is rated as 3.69 for white.

First few moves are:

45 Qc8 ch Kh7 46 Qc2 ch Kg8 47 d6 Qe6
48 Qc6 Qe1ch 49 Kh2 Qxf2 50 Qc8ch Kf7 51 Qxg4 Bf6 etc.

I don't think there is an 'immediate' won, just white has too much material.

Apr-12-18  Sally Simpson: Hi DTal,

The resignation is sound.


click for larger view

41...Kg8 42.Qe8+ followed by Qe6+ picking up the a6 Bishop. Three pawns up and the g4 pawn is not looking too clever.

Although it is not unknown for a grandmaster to resign prematurely when playing another grandmaster this is not one of them cases.

Though I do grant you a few more moves could have been tried as Black does have an opposite coloured Bishop attack on f2 which can be defended.

White will have to let f2 go if he is to make progress but the d5 protected pawn will set Black new problems.

I would have plodded on for a few more moves, I've saved worse positions for Black but not v a grandmaster.

Apr-12-18  steinitzfan: I did the delightfully pedestrian trade of queens followed by taking the knight pawn. (app 2.0 according to our 6 second analysis tool). I'm going to say that I solved a Thursday puzzle.
Apr-12-18
Premium Chessgames Member
  whiteshark: I was loo♔ 4#, not 4 loose pieces...
Apr-12-18  devere: 37.Nf5+ Kg8 38.Qxe5 is certainly good enough to win, so there is little reason to play the slightly better and much more complicated 37.Qxe5+
Apr-13-18
Premium Chessgames Member
  ChessHigherCat: White Shark was loo♔ 4 love n all the wrong pl♤♤
Apr-13-18
Premium Chessgames Member
  ChessHigherCat: Or, for tennis players, White Shark was loo♔ 4-0 n all the wrong pl♤♤
Apr-13-18
Premium Chessgames Member
  ChessHigherCat: Or, with a French accent:

White Shark was loo♔ 4-0 n l z wrong pl♤♤

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