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Dmitry Andreikin vs Alexei Mikhailovich Bezgodov
Moscow Open (2010), rd 2, Jan-31
Zukertort Opening: Grünfeld Reversed (A49)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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Feb-08-10
Premium Chessgames Member
  kevin86: Yikes! I just threw a pick-six:My move was Bh6??-Saints alive! Qd1+ is VERY dangerous-a perpetual is then quite possible.

A blown Monday-what a snowy week ahead :(

Feb-08-10
Premium Chessgames Member
  johnlspouge: < <YetAnotherAmateur> wrote: [snip] Granted, Bd4 is better, but Bh6 does appear to work. >

Because of the perpetual, Toga evaluates 24.Bh6 at about 0.1 P, essentially an even position. The move 24.Bh6 most assuredly does <not> work. See <zanshin>'s post.

Feb-08-10  VincentL: In this "very easy" puzzle, 24. Bd4, and its mate next move with Qg7 or Qh8 unless black gives up his queen with 24.....Qxd4.

If black plays 24....Qxf6 25. Rxe8 mate.

I was looking for something "flashier" - but I don't see it

Feb-08-10
Premium Chessgames Member
  patzer2: <Buttinskhy> <"Thou shalt commit adultery."> Don't think it's working out so great for Tiger Woods, Mark Sanford or lots of other unfaithful spouses who are paying through the nose in child support and alimony -- not to mention the emotional and physical damage (potential for STDs, stress induced illness etc.) unfaithfulness can cause (affecting not only husbands and wives but also any children involved).
Feb-08-10  VincentL: Uh..... The ultimate in carelessness.

Of course 25. Rxe8 is not mate. Black has 25.....Kg7, and after 26. Bxf6+ Kxf6 white is an exchange up.

Failed on a Monday....

Feb-08-10
Premium Chessgames Member
  agb2002: <johnlspouge: < <agb2002> wrote: [snip] I didn't find any reason to hurry up with 26.Bxf6 and noticed that e7 was available for the rook. >

I considered holding off the capture with the supported Bd4, but saw that capture followed by Re8-a8 was simple and good: it leaves Black with nothing but ashes.>

Agreed. I preferred Re7 because pawns don't like lateral attacks.

<Toga likes Re8-e7 before Bd4xf6 better than immediate capture: the difference in the evaluation function is at most 0.05 P, however.>

That means that after 20 moves my method would yield a whole extra pawn... ;-)

Feb-08-10  NakoSonorense: Great! Now I feel like a patzer. =(
Feb-08-10  YouRang: For a moment, I entertained both 24.Bd4 and 24.Bh6, thinking that they were both solutions.

But when I thought about possible black replies, I noticed that 24.Bh6 gave black an opportunity to give check with 24...Qd1+, and it looks like it might be problematic to evade checks.

So, 24.Bd4 it is, with the added appreciation that it not only threatens mate (forcing black to surrender his Q), but it also closes the d-file (thus stopping black counter-threats).

Feb-08-10
Premium Chessgames Member
  johnlspouge: < <agb2002> wrote: [snip] I preferred Re7 because pawns don't like lateral attacks. >

Terse reasoning like this is very helpful to me. Thanks, Antonio.

< <Toga likes Re8-e7 before Bd4xf6 better than immediate capture: the difference in the evaluation function is at most 0.05 P, however.>

That means that after 20 moves my method would yield a whole extra pawn... ;-) >

What!?! Where are the variations to back up your claim?

;>)

Feb-08-10  mrsaturdaypants: This one is, indeed, easy to see. I think what I need to recognize better is the power of bishops to hem a king in, especially when his own pawns block him on opposite-colored squares. The difference between this puzzle and some harder ones will simply be that delivering the final blow with a heavy piece will be much harder, but using a bishop to ready that blow will still be the key.

Now: I tried 24 Bh6, expecting 24...Qxf6 25 Rxe8#, or 24...Rxe2 25 Qxd8+ Re8 26 Qxe8#.

But what about 24...Qd1+ 25 Kg2 Qd5+ 26 Kh3 Qd7+ 27 Kh4. Now if 27...Qa3+, 28 f4 wins. But if 27...Qd8, white's queen is pinned, and he will have to settle for simplifying to an even endgame.

So instead, 24 Bh6 Qd1+ 25 Kg2 Qd5+ 26 Kh3 Qd7+ 27 g4 Qd3+ 28 Re3 Rxe3 29 fxe3 Qxe3 30 Bxe3, with mate to follow.

I may have made this harder than it needed to be. Time to check.

Feb-08-10  Riverbeast: <But what about 24...Qd1+ 25 Kg2 Qd5+ 26 Kh3 Qd7+ 27 Kh4. Now if 27...Qa3+, 28 f4 wins. But if 27...Qd8, white's queen is pinned, and he will have to settle for simplifying to an even endgame. >

In that line, after 27...Qd8, white can just play 28. Rxe8+ followed by 29. Qg7 mate

The problem with 26. Kh3, is that white continues the checks with 26. Qh5+ (!)

Feb-08-10
Premium Chessgames Member
  Once: <patzer2: A lot of tactics are demonstrated in today's "easy" puzzle. Discovered attack, obstruction, clearance, over worked piece, and double attack are all involved with the 24. Bd4! combination.>

Add one more tactic to your admirable list - after 24. Bd4 Qxf6 25. Rxe8+ is a zwischenzug, which sounds like it ought to be more a scrabble term than a chess tactic.

Feb-08-10  doubledrooks: 24. Bh6 was my first try, but I realized 24...Qd1+ leads to perpetual or loss of material.

So I went for 24. Bd4 Qxf6 25. Rxe8+ Kg7 26. Bxf6+ Kxf6 27. Rb8 b6 28. Rb7.

Feb-08-10  Samagonka: At first I instinctively went for Bh6 but then corrected myself after looking longer. Nice way to start the week.
Feb-08-10
Premium Chessgames Member
  patzer2: <Once> Thanks for adding the "in between move" to the list of tactics involved in our "easy Monday" puzzle solution 24. Bd4! combination.

One could also add defensive combinations (needing to visualize that 24. Bh6?! Qd1+ 25. Kg2 Qd5+ 26. Qf3 to = holds for Black) and deflection (i.e. removing the guard or defender) to the list.

Feb-08-10  mrsaturdaypants: Oops. It's all clear now.

Lessons for me:

1. Stop assuming that your first candidate move is the right one, even if it seems to work.

2. Start noticing that queens are very mobile. Not sure why I saw only Qd7+ and not Qh5+. I guess this is a related blindness - I saw one dangerous move from black, and didn't look for other ones.

Feb-08-10  SamAtoms1980: Dear God, I blew this...
Feb-08-10
Premium Chessgames Member
  beenthere240: I sure don't get 14...g6 -- "Hey, White, here's an opportunity for you. See what you can make of it."
Feb-08-10  scormus: <I sure don't get 14...g6> whatever Black's best move was, I'm sure that wasn't it. At first sight Ne5 looks a lot better. I confess to being among those who took the words "very easy" a bit too literally. Maybe the way to play this thing ..... if pick the wrong move you get a chance to redeem by going back and finding an improvement on the earlier play.
Feb-08-10
Premium Chessgames Member
  beenthere240: Although the exchange sac 16...Rxc3 was probably even worse.
Feb-08-10  remolino: Awful exchange sac. Black does not get sufficient comp after 16...RxN. What was this guy thinking, that he was Petrossian?
Feb-08-10  turbo231: I agree with <agb2002> re7 is the "killer move" in the rook knight end game. That's possible because the queen is pinned by the bishop, that makes e8e7 possible, and it makes the end game 10 times easier!
Feb-08-10  hstevens129: Seems that 24.Bh6 also works, not just to win the exchange but to checkmate (after a few spite checks from Black)

E.g. 24.Bh6 Qd1+ 25.Kg2 Qd5+ 26.Kh3 Qd7+ 27.g4 Qd3+ 28.Re3 Qf1+ 29.Kh4

Now Black can't check the White king from a safe square and can't prevent 30.Qg7# or 30.Re8#

Feb-08-10  YouRang: <hstevens129: Seems that 24.Bh6 also works, not just to win the exchange but to checkmate (after a few spite checks from Black) E.g. 24.Bh6 Qd1+ 25.Kg2 Qd5+ 26.Kh3 Qd7+ 27.g4 Qd3+ 28.Re3 Qf1+ 29.Kh4

Now Black can't check the White king from a safe square and can't prevent 30.Qg7# or 30.Re8#>

Good try, but instead of 26...Qd7+, black spoils it with 26...Qh5+! :-\

Feb-08-10
Premium Chessgames Member
  OBIT: <johnlspouge>On zanshin's computer analysis of the B vs N ending that arises after the inferior 24. Bh6, I like the bot's analysis through move 32, but I think 33. c5 is too quick. Instead, play 33. Kd4, trying to get the king to d5. After 33. Kd4 Kd7 34. Kd5 Black is going to have a tough time holding this. If the Black king goes to c7, the White king goes after the kingside pawns with Ke5. If the Black king goes to e7, White plays c5. If the Black king stays where he is and tries to shuttle his knight around (e.g. Nb7-a5-b7-etc.), White first brings his kingside pawns forward (g4, etc.) to freeze the Black pawns. Then, on a move when the knight is not covering c5, White plays c5 to force force bc Bxc5 a6 and again heads to the kingside with the bishop cutting off some key squares.

I won't swear this is a win with perfect defense, but I think White has excellent practical chances. It's a nice bonus for a Monday - not only do we get a fairly tricky Monday puzzle, we get a Saturday level endgame. :)

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