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Sebastian Bogner vs Gillan Bwalya
Chess Olympiad (2010), Khanty-Mansiysk RUS, rd 1, Sep-21
Dutch Defense: Stonewall. Modern Variation (A90)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Nov-02-10  euripides: worth noticing the off-piste <43.Bf7+ Kf7 44.Rf6+ Ke7> 45.Rxf8 Bc6 mate.
Nov-02-10  Patriot: 43.Bf7+ and white wins in all lines. Nice problem!

I was wondering where black really started to degrade so I back-tracked and black seemed to be in terrible trouble at least since move 33. After 33...Rh4? 34.e6! (threatening 35.Rd8+ Kg7 36.Rd7 ) 34...Bxe6 35.Qd4+ Kg8 36.Qe5 and it's all downhill for black.

If black tried 33...Rxd6 34.exd6 Qe3+ 35.Kh1 Bd6. Or 34.Qxd6 Qxd6 35.exd6 Bd6 (not 35...c6 36.Bc6 or 35...gxf4 36.Bxc6 and 37.d7 ) 36.fxg5 looks losing for black. In this case, white has a kingside majority and a simple plan of putting the king on g3; play Bh3; and d7. Black has a majority on the queenside but I think white's pawns are faster.

So perhaps black was lost before move 33. I don't have an engine available. Does anyone have any ideas?

Nov-02-10  JG27Pyth: Found it but have to rate it a fail anyway because I was completely oblivious to Black's mate-in-one threat and had the combination worked to win the Queen rather than force mate I'd be up a queen and down a mate. (A phrase somehow congruous with Once's marvelous post.)
Nov-02-10  Patriot: <<al wazir>: Why didn't white play 40. Qa8+, and after 40...Qf8, 41. Bf7+ ?>

I assume you mean 40.Qb8+ Qd8 41.Bf7+. Well, what if 41...Kxf7? 42.Qxd8?? Bxc6+ 43.Qd5+ Bxd5#. After 42.Rf6+ Kxf6 43.Qxd8+ Ke6 it doesn't look like a clean kill.

Nov-02-10  Patriot: <al wazir> Or after 42.Rf6+ just 42...Qxf6 is much better.
Nov-02-10
Premium Chessgames Member
  hedgeh0g: 43.Qe5+ also wins.
Nov-02-10
Premium Chessgames Member
  Sastre: If 43.Qe5+, Black can defend with <43...Qe7 44.Qb8+ Qd8 45.Qxa7 (45.Bf7+ Kxf7 46.Qxd8 Bxc6+) Rxf4>.
Nov-02-10
Premium Chessgames Member
  patzer2: <Once>'s post about true love and Chess also includes a few lyrics from the song Summer Nights from the 1978 movie Grease with John Travolta and Olivia Newton John. You can find it online at http://www.youtube.com/watch?v=FpJU...
Nov-02-10  EXIDE: Got this right. Nice puzzle for today. Black will loose Queen as a minimum.
Nov-02-10
Premium Chessgames Member
  kevin86: A fine finish;the pin is added to the skewer:43 ♗f7+ ♔xf7 (or ♔e7 44 ♕f6#) 44 ♖f6+ and the queen mates next turn

I missed the quick mate and went with:43 ♖e6+ ♗xe6 44 ♗c6+ ♗d7 45 ♗xd7+ ♔xd7 46 ♕xf8 and wins the queen vs rook ending.

I like the swinging gate of the bishop.

Nov-02-10  cuppajoe: <hedgeh0g: 43.Qe5+ also wins.> What happens after 43. ... Kd8?
Nov-02-10
Premium Chessgames Member
  al wazir: <Patriot:I assume you mean 40.Qb8+ Qd8 41.Bf7+.>

No, I meant "Why didn't white play <40. Qh8+>, and after 40...Qf8, 41. Bf7+ ?">

Sorry about that. My chess dyslexia struck again.

Nov-02-10
Premium Chessgames Member
  chrisowen: <cuppajoe> <hedgehog> Sebs curia regis?

Bognor call side minor offences it bishop dancing stagnant king caught coasting f7+ mate in three inject.

Nov-02-10
Premium Chessgames Member
  chrisowen: Seraphim it was hell bell rook hogging hfile pawn sweeping Gillan drop h4. In the ocean optical tune dent Bd7 you rest case white. Long may your big jib draw.
Nov-02-10  MiCrooks: Patriot - he clearly meant Qh8+ not Qa8+ or Qb8+. Point was same combination was available two moves earlier on move 40.

Exide - look a bit closer...it's mate no matter what not just loss of Queen.

Cuppajoe - Kd8 Qxf8+ Be8 Qxe8++

Nov-02-10  Patriot: <al wazir> OH! You may be right or he could've been trying to gain time (if down to the last few seconds). It's definitely easier to see what happens on 40.Qb8+ over 40.Qh8+ so if he had only 5 seconds remaining that would be a way to gain 45 seconds or whatever the increment could have been. But that's just a guess so it could be exactly what you said...he didn't see it!
Nov-02-10  David2009: S Bogner vs G Bwalya, 2010 White 43?

White can win by a forcing sequence but must avoid getting mated on the a8-h1 diagonal: 43 Bf7+ Ke7 forced (if ...Kxf7 Rf6+ etc) 44 Qe5+ Kxf7! (for Kd8 see line A below) 45 Rf6+ Kg7 or Kg8 (these are Black's only two legal moves) 46 Rxf8 WITH CHECK Kxf8 47 Qd6+ Ke8 48 f5 with a difficult win.

Line (A): 44...Kd8 45 Qc7+ Ke7 46 Re6+ Kxf7 47 Qxd7+ Kg8 48 Re8 and White wins Q for R with an easier win.

Time to check and input the puzzle position into Crafty End Game Trainer: ========


click for larger view

S Bogner vs G Bwalya, 2010 White 43? http://www.chessvideos.tv/endgame-t...

Egg on my face: after 43 Be7+ Ke8 44 Qf6 is checkmate. So Crafty EGT captures the B, preferring mate in two to mate in one.

The roll of honour of those who spotted 44 Qf6# begins with <whiteshark, Phony Benoni, dzechiel, LIFE Master AJ, White Star> and then UTCAA.

The next link allows exploration of variations beginning 43...Ke7!? There is mate in one but if White plays instead 44 Qe5+ (my analysis) the win after 44...Kxf7! is highly problematical. http://www.chessvideos.tv/endgame-t...

Moral: Black resigned too early! 43...Ke7 costs nothing and gives White a last chance to go wrong. THere is such a thing as showing too much respect for an opponent!

Nov-02-10  chesskidnate: <cuppajoe> the safest way for black to proceed is 43...1/2 due to repitition, but that aside after 43...Kd8 44.Qc7+ Ke8(gives black more options on next move)45. Re6+! Kf7(45...Bxe6 46.Bc6+ Bd7 47.Qxd7#; 45...Qe7 46.Rxe7 Kxe7 47.Bc6) 46.Qxd7+ Kg8 47.Re8+ followed by mate in 1(saccing the queen on move 46... may stall it but black fares rather poorly with Rvs. Q+R+B)meaning that you might as well block with the queen and lose to the game line which I feel is tougher to find
Nov-02-10  BOSTER: It's difficult to imagine more"naked ", more strange picture than we have today in our puzzle. And this is not surprise that when former great lover of the black queen white bishop, flying from center, airport "d5", arrived to black camp ,hotel f7, where he expect to spend nice time with her majesty, she could not accept his offer, because she has no any power to move in this direction. People,dealing with chess, use the expression she was "pinned". Who does not play chess I'd say that king was here,and game was over. Next day during my lunch,when the Sun was drawing different fantastic pictures on the wall of the big building, I read " Yesterday we successfully finished the operation under name "decoy".
Nov-02-10  Brandon plays: This was actually a bit hard to see. I saw Bf7+ but then I thought that Black could just decline it (for some reason). But this is actually not that hard. Bf7+ Ke7 Qf6#.
Nov-02-10  WhiteRook48: oh of course but i missed that
Nov-02-10  Patriot: I was right. Black went downhill on move 33, as confirmed by Fritz. The best move is not 33...Rxd6 as I suspected white would be winning, and 33...Rh4 had to be bad thanks to 34.e6!. Here's the top 4 moves:

33...Rg6 +0.07
33...Kg7 +0.46
33...Rxd6 +1.99
33...Rh4 +2.74

Nov-02-10  wals: Two in a row ? Excellanto.

As <patriot> noted Black lost the game with 33...Rh4.

depth 18 : 5 min ;
Black blunder
(+2.96):33...Rh4. Best, Rg6, =0.09,
or Kg7, =0.27.

depth 16 : 2 min :
White gave Black a chance with
(=0.00):40.Qb8+. Best, Qh8, +#4.

Black needed White to play 41.Rxb6
=0.00, to survive.
41.Qe5+ meant checkmate, Qe7, in 4,
Kf8, in 3, and Be6, in 2.

Nov-02-10  muralman: Two in a row here too, but these are the easy days. This one had me looking at a Queen move, and a Rook move before I saw the Bishop check. That made the checkmate possible. The tripple threat on my Queen, Rook , and king made the checkmate line find all the more necessary.
Nov-03-10  turbo231: Tricky but I finally figured it out. Here lately I've been having better luck on Tuesdays. Yesterday's puzzle was unfortunate, someone messed up.
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