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Nikolay Antonovich Kopaev vs Vladimir Alatortsev
U.S.S.R. (1938)
Sicilian Defense: Scheveningen. Classical Variation (B84)  ·  1-0

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Nov-27-06  stradivarius17: Chessbase: Good monday or tuesday puzzle from white's move 33.
Mar-04-12  backrank: The situation on the board after White's 32. g6 (White pawns on f6 and g6!) is picturesque. Nice queen sac on the following move, too. The point, of course, is 34. ... Kh7 35. gxf8N+! winning about the whole Black army. A few moves earlier, 31. ... gxf6 32. g6!! would have been very beautiful, too.
Aug-02-12  backrank: Position after 32. g6!


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Had Black played 31. ... gxf6 (instead of Qe6), there would have come 32. g6!


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Study-like positions each chess player dreams of ...

Dec-19-19
Premium Chessgames Member
  agb2002: White has a bishop and a knight for the bishop pair.

Black threatens Qxd7 and Bxf6.

The pawn on f6 can be useful to create mating nets. This leads to 33.Qxh6+ gxh6 (33... Kg8 34.Qh7#) 34.g7+:

A) 34... Kg8 35.gxf8=Q+ Kxf8 (35... Kh7 36.Qg7#) 36.Rxd8+ Qe8 37.Rxe8+ + - [N].

B) 34... Kh7 35.gxf8=Q

B.1) 35... Qxd7 36.Qg7#.

B.2) 35... Bxf6 36.Rxf7+ wins.

B.3) 35... Qxf6 36.Rxf7+ wins.

B.4) 35... Kg6 36.Qg7#.

Dec-19-19  Walter Glattke: White wins only a pawn with 33.fxg7+ Kxg7 34.Rxf7+ Rxf7 35.gxf7 Qxf7 36.Qxe5+ Kg8 37.Bh5 Qg7+ 38.Qxg7+ Kxg7 39.Kf3
Dec-19-19  Granny O Doul: @strad: "Monday or Tuesday" maybe back in 2006. We've gotten dumber since then.
Dec-19-19
Premium Chessgames Member
  An Englishman: Good Evening: Puzzle proved easy. Figuring out how that bizarre position arose--impossible. Just plain impossible.
Dec-19-19  AlicesKnight: Found the gameline surprisingly early in the morning. Very pretty. <An Englishman> is right about the position.
Dec-19-19  Sally Simpson: Got this quicker than some Monday puzzles.


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The Queen sac (Qxh6+) is the first thing you look at and it flows from there with forced only moves, even here...


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If Black played 34...Kh7 then 35.gxf8=N+

Dec-19-19  saturn2: Hard work for me. Though 33. Qxh6+ gxh6 34. g7+ Kg8 35. gxf8=Q+ Kxf8 was the first thing I looked at I did not immediatly see 36. Rxd8+ and so on.
So I looked at some other void 33 th moves in beetween.
Dec-19-19  Autoreparaturwerkbau: <Dec-19-19; Sally Simpson: If Black played 34...Kh7 then 35.gxf8=N+>

If 34...Kh7 simple <35.gxf8=Q> does a much better job, since rook is immune (mate in 1 threat on g7) which opens many other mating threats.

Dec-19-19  stacase: stacase: Just because it's a puzzle even though it's not Monday yeah, it's probably 33.Qxh6+ I sure didn't "see" all 5 moves to the end, but it nearly "played" itself. Over the board maybe 33.Qxh6+ would have been the only thing to try. Well anyway it was a great romp, all the pieces were in the right places.
Dec-19-19  patzer2: I missed on today's (33. ?) Thursday puzzle. I stopped calculating the 33. Qxh6+! line and gave up on it after 33. Qxh6! gxh6 34. g7+ Kg8 35. gxf8Q+ Kxf8, because I didn't look ahead one more move to see 36. Rxd8+ +-.

The best alternative to 33. Qxh6+! is 33. Rxf7 Rxf7 34. gxf7 Qxf6 35. Qf5 +-, which wins but with more difficulty than the game continuation.

P.S.: Black's decisive error was 30...Bd8?, allowing 31. f6!! +-. Instead of retreating the Bishop, protecting it with 30...Qb4 = or 30...Qa3 = keeps the game level.

Dec-19-19  King.Arthur.Brazil: What I though was: 33. ♕xh6+ gxh6 34. g7+ ♔h7 35. gxf8=♕ ♗xf6 36. ♖xf7+ ♔g6 37. ♕g8+ ♗g7 38. ♕xg7# Time to check.

If 32...fxg6 then you have the quick way with: 33. fxg7+ ♔g8 34. gxf8=♕+ ♔xf8 35. ♖xd8+ (not 35.♕h7? ♗f6) 35...♔e7 36. ♕h4+ ♔f7 37. ♕xh7+ ♔f6 38. ♖f8+ ♔g5 39. h4# or the long way: 36...♕f6 37. ♕xf6+ ♔xf6 38. ♖xa8 with enough material ahead to easy win.

Nevertheless, in a Tal style, I would play the sequence: 34. ♕xh7+ ♔xh7 35. gxf8=♘+! ♔h6 36.♘xe6 ♗f6 37.♘c1... wondering ♘d3-f2-g4# or 35... ♔g8 36.♘xe6 ♗f6 37.♘c3... heading for ♘d5-f6 if possible.

In the historical date of 18/12/19, an unknown Brazilian king made Baron <cristowen> speaks his first four words in understandable English: < Hub of the green! > Miracle! The third degree immediate contact happened! Yes! Maybe he is asking for food! lgs. It is a kidding, my friend! Have a nice X-mas! (but I still don't undestand a word from his posts... sorry).

Dec-19-19  belgradegambit: Got this one immediately on first try. Just needed to pretend it was Monday queen sac day.
Dec-19-19  Momentum Man: I solved this puzzle rather easily. I believe it was too easy for a Thursday puzzle
Dec-19-19
Premium Chessgames Member
  drollere: this puzzle is what's known as "simplification."
Dec-19-19
Premium Chessgames Member
  Jimfromprovidence: Go back and look at the position after 30...Qb4 instead of the text 30...Bd8.


click for larger view

Black's queen now protects the black bishop and there is also the threat of 31...Bxe4 and the exchange of bishops.

The question is if white can still win from here.

Dec-19-19  Patriot: <<patzer2>: I missed on today's (33. ?) Thursday puzzle. I stopped calculating the 33. Qxh6+! line and gave up on it after 33. Qxh6! gxh6 34. g7+ Kg8 35. gxf8Q+ Kxf8, because I didn't look ahead one more move to see 36. Rxd8+ +-.>

I may have done that also at first. It's easy to do, especially when there seems to be other interesting options. That's when I feel like I may be missing something easier and tend to scrap what I'm thinking because it feels like going down a rabbit hole. It is good to think about 3-ply on everything relevant before embarking on any journeys ("look wide before you look deep").

If I didn't see the simplification as <drollere> pointed out, my next option would've been <33.Rxf7 Rxf7 34.gxf7 Qxf6 35.Qf5>.

Dec-19-19
Premium Chessgames Member
  Breunor: Oddly I got this one pretty quickly, my record for Thursday is poor; Qxh6 seemed to scream out.

When I first looked at it I thought it. Was composed!

Dec-20-19  TheaN: Ugh. Missed this looking at it for five minutes yesterday and spoiled it for myself when I went to the correct move today, so no credit there (would have just been too slow anyway for a puzzle of this difficulty, it's a straightforward combination).

<Autoreparaturwerkbau: <Dec-19-19; Sally Simpson: If Black played 34...Kh7 then 35.gxf8=N+>

If 34...Kh7 simple <35.gxf8=Q> does a much better job>

This is an interesting statement, as it does so <objectively> (both f7 and g7 can't be defended). In a time scramble, I wouldn't be surprised if White would pick a knight.

The position after 35.gxf8=N+ +- is completely without risk for White after 35....Kg8 36.Nxe6 Bxf6 37.Nd8! at least trading a piece the next move with Ra7, going up rook and piece vs a bishop. Even if White doesn't play Nd8 it's won without trouble.

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