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Henrique Mecking vs Sandro Mareco
Memorial Antonio Rocha (2011), Campinas BRA, rd 13, Jan-25
Nimzo-Indian Defense: Normal Variation. Bernstein Defense Except Gligoric System (E53)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Jan-19-21  Patriot: <Jimfromprovidence> 33.Qh3 Be4 34.Bxe4 Qd1+ 35.Kg2 Qd2+ causes some problems for white I think? Whereas 33.Qh4 Be4 34.Qxe4 +-.

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Jan-19-21  TheaN: <Brenin: (...) 32 Kh1 allows Black many more options>

This is exactly the point why I'm so surprised many prefer 32.Bd4: Kh1 doesn't give Black any more options.

He'll still have to defend g7, so will still have to give up at least the knight, and that's worse in the Qc5 line. That Bd4 wins the queen is somewhat moot, as White isn't doing that in the first place (31.Rd7 Nf5 32.Rxe7 Nxg3).

I get Bd4 is a <direct> move, whereas Kh1 is indirect as it doesn't create any new threats, so I get it on a first glance it's chosen often, thanks for the answer.

Jan-19-21
Premium Chessgames Member
  Jimfromprovidence: <Patriot> <33.Qh3 Be4 34.Bxe4 Qd1+ 35.Kg2 Qd2+ causes some problems for white I think?>


click for larger view

Yes, in that position above the black queen now covers h6 so after the king moves black has 36...h6

<Whereas 33.Qh4 Be4 34.Qxe4 +-.>

Yup, with 33 Qh4 Be4 the bishop still covers d1 for white after 34 Qxe4.


click for larger view

There is also 33.Qh3 Be4 34 fxe4 Qd2 to consider.

Jan-19-21
Premium Chessgames Member
  eternaloptimist: I solved it but it took a few minutes longer than usual for a Tuesday POTD. Itís probably better suited to b a Wednesday puzzle. Mecking did a good job of using his ♗s on adjacent raking diagonals throughout this game & a pretty good job of setting up the final move
Feb-21-21  areknames: < I solved it but it took a few minutes longer than usual for a Tuesday POTD> I remembered this one from about a month ago and 31.Rd7 is indeed a lovely move. A difficult Tuesday.
Feb-21-21
Premium Chessgames Member
  al wazir: <areknames: A difficult Tuesday.> But it's not Tuesday.

What is insane about this puzzle?

"Insanity is doing the same puzzle over and over and expecting a different result."

(No, Einstein didn't say that.)

Feb-21-21  stacase: Not as easy peasy as yesterday, cute maybe, but certainly not insane.
Feb-21-21  nalinw: This is like playing modern computer games on old machines - they run slowly and you can run up the score :-)

Maybe the first "Sunday" puzzle I have solved ever!

Feb-21-21  areknames: <But it's not Tuesday> Which was my point, it was a Tuesday the previous time this puzzle made an appearance.
Feb-21-21
Premium Chessgames Member
  An Englishman: Good Evening: Another repeat from last month, and as others have observed, this originally appeared on a Tuesday. 4/5 with 2 known this week. Flubbed Wednesday. Sigh. Monday yet?
Feb-21-21  The17thPawn: Yawn!!! Getting so the only interesting part of the puzzle of the day is determining how recently it was used as an easier puzzle.
Feb-21-21  Refused: I know pattern recognition are important in chess and helpful with training tactics in particular. But this is getting ridiculous. It's not just the fact that it was used not merely a month ago. But then it was used for Tuesday (?) puzzle, but now it's Sunday?

I think somebody should check on the algorithm, that assigns the puzzle positions to the days.

Feb-21-21  Brenin: This repetition allows me to confirm that, although I have a poor memory for games and positions, my tactical awareness hasn't deteriorated in the last month. Thanks, CG!
Feb-21-21  Walter Glattke: 31.Rd7 Qxd7 32.Qxh4 Bd5 33.Qxd5 mating
31.-Qc5+ 32.Bd4 (agb) Nxf3+ 33. gxf3 Qh5 34.Qxg7+ as in B) 34.-Rxg7 35.Rd8+ Qe8 36.Rxe8# or 32.-Nf5 33.Bxf5 is mate like in B), 32.-Qxd4 33.Rxd4 Nf5 34. Bxd5, best answer is C) 31.-Nf5 32.Rxe7 Nxg3 33.hxg3 no better moves found
Feb-21-21  Nosnibor: Very easy for a Sunday. Spotted Rd7 within a minute.
Feb-21-21  morfishine: <31.Rd7> is obvious, besides being known, thus not insane
Feb-21-21
Premium Chessgames Member
  agb2002: Level 4: 28.?
V Akopian vs Kamsky, 1986


click for larger view

Feb-21-21  mel gibson: I didn't see that line.

Stockfish 12 saw it:

31. Rd7

(31. Rd7
(♖d1-d7 ♘h4-f5 ♖d7xe7 ♘f5xg3 c4xb5 a7-a6 b5xa6 ♘g3-e2+ ♔g1-f1 ♘e2-f4 ♗c2-b3 h7-h5 a6-a7 h5-h4 ♖e7-c7 h4-h3 g2-g3 ♘f4-d5 ♖c7-d7 ♘d5-f6 ♖d7-d4 ♗a8xf3 ♖d4-h4+ ♘f6-h5 g3-g4 ♗f3xg4 ♖h4xg4 ♖g8-f8+ ♔f1-e2 ♖f8-a8 ♖g4-h4 ♖a8xa7 ♖h4xh5+ ♔h8-g8 ♗b3xe6+ ♔g8-f8 ♗b2-d4 ♔f8-e7 ♗d4xa7 ♔e7xe6 ♗a7-e3 ♔e6-d6 ♖h5-h7 ♔d6-d5 ♖h7xg7) +8.96/36 78)

score for White +8.96 depth 36

Feb-21-21  AvidChessMan: Spotted it in seconds. Not a Sunday puzzle in my opinion.
Feb-21-21
Premium Chessgames Member
  malt: Looked at 31.Rd4 first,

settled on 31.Rd7 Nf5 32.R:e7

(32.Qc7 Qg5 33.B:f5 )

32...N:g3 33.hg3

Feb-21-21  mel gibson: <Feb-21-21 AvidChessMan: Spotted it in seconds. Not a Sunday puzzle in my opinion.>

come on mate it wasn't that easy -
look at all the possible lines:

< little ernie: Cooked seven ways to Sunday. Many moves give White a winning score, albeit Rd7 the best. Stockfish 10 at 24-25 ply :

Rd7 + 8.25
cxb5 + 3.73
Qf4 + 3.28
Rd2 + 2.92
Qd6 + 2.88
Re1 + 2.65
Kh1 + 2.50
IMHO finding Rd7 is not 'Easy', at least not for a patzer like me. >

Feb-21-21
Premium Chessgames Member
  chrisowen: Yep braille Rd7 goodness avows ado not guv yep pearly gases barbeque quo knots tonks whicks hmm hgv juf its petty han has flick com ihasco vilify mug witz bug axled its diminish add its ignoble flubb gaver eel its come bad tings avo Rd7 bivvy:
Feb-21-21  moncul36: Yeah, seemed pretty easy for a saturday. Rd7 immediately popped up as that g-pawn is stuck, can't move and can't protect the h-pawn if it goes to h6, so if the Q can attack h7, game over.
Feb-21-21
Premium Chessgames Member
  drollere: note to self: whenever you have two B's crushing two adjacent diagonals, and the diagonals end on the p's protecting the K position -- that is a good place to put your attention.
Feb-21-21
Premium Chessgames Member
  Ned Merrill: It took me a minute before I remembered that I had seen this one someplace before - I remembered the trick was the bishops pinning the Black pawns down when trying to defend the king.
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