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Larry Mark Christiansen vs Vladimir Kovacevic
Chess Olympiad (1990), Novi Sad YUG, rd 12, Nov-30
Queen's Gambit Declined: Exchange. Positional Variation (D35)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 3 OF 3 ·  Later Kibitzing>
Nov-09-05
Premium Chessgames Member
  patzer2: White's 28. Qc5?? allows Black to play today's winning puzzle solution 28...Nc4! for an instructive Queen trap.

Instead of 28. Qc5??, White would have been OK after 28. Bd3 with an even game.

Nov-09-05  Dionyseus: I did not get it, I was looking for a mate.
Nov-09-05
Premium Chessgames Member
  YouRang: Got it. After the first two puzzles this week, I spent some time looking for a clever mating attack. But after getting nowhere with that, I just looked for a good move. At that point, 28...Nc4 became fairly obvious, as it neatly locks up the queen for impending capture after 29...Bd6 (or 29...b6).
Nov-09-05  klausewitz: 28. ...Nf4, great move! Don't get the puzzle... Looking for a mate, like Dionyseus.
Nov-09-05  klausewitz: Nc4! Sorry!
Nov-09-05
Premium Chessgames Member
  kevin86: I,like many others,looked for a mate-but soon noticed the queen trap. There are many fine queen traps-maybe that could be a theme some time.
Nov-09-05  BipolarChessorder: It would have been better to play 29. Qxe7 rather than wait for 29...Bd6 (White at least gets a rook for the Queen). btw, that's what makes 29...Bd6 superior to 29...b6.
Nov-09-05  sharpnova: after Nc4, what if white plays Ne2? now the bishop can't attack the queen
Nov-09-05  notsodeepthought: <sharpnova> Not with Bd6 as in the game, but Bb6 will win.
Nov-09-05  Norman Glaides: I might as well go kill myself now, first time I've not got a wednesday puzzle.
Nov-09-05
Premium Chessgames Member
  YouRang: <BipolarChessorder> ... <btw, that's what makes 29...Bd6 superior to 29...b6.> Actually, 29...b6 is MUCH worse -- the queen trap falls apart when black's queen is counter-attacked by 30. Bd7!

If 30...Rxd7, then 31. Qxc6 (the rook blocks the queen's defense of the c6 pawn)

If 30...Qxd7, then
31. Qxd7 Qxd7
32. Nf5+ (forking and winning black's queen)

Nov-09-05
Premium Chessgames Member
  al wazir: It's hard to believe Christiansen didn't see that his queen was trapped. Why else did he play 29. e4 ? But then why didn't he continue with the line 30. Bd7 Qxd7 31. Nf5+ suggested by <eaglewing>? And why did he go on playing after losing his queen?
Nov-09-05
Premium Chessgames Member
  YouRang: <sharpnova: after Nc4, what if white plays Ne2? now the bishop can't attack the queen> But black still has 29...b6 in that case.
Nov-09-05  HoopDreams: Nc4! figured it out. Figured it out in like 3 minutes. At first i looked at bishop sac on b6 - Bb6.. because after Qxb6 Nc4 Qc5 b6.. the queen is trapped. But that wouldnt work because after the first move Bb6 the Queen can just run away. So then i found the great waiting move Nc4, that sets the queen's trap
Nov-09-05  awfulhangover: Took 30 seconds. I'm improving!
Nov-09-05
Premium Chessgames Member
  OhioChessFan: <It would have been better to play 29. Qxe7 rather than wait for 29...Bd6 (White at least gets a rook for the Queen).>

That is what I thought playing through the game. I haven't seen anyone address 29 Qxe7. I'm sure there's some simple refutation but I sure don't see it.

Nov-09-05
Premium Chessgames Member
  YouRang: <OhioChessFan> <I haven't seen anyone address 29 Qxe7. I'm sure there's some simple refutation but I sure don't see it.> I think the "refutation" is just 29...Qxe7. That is, black wins a queen for a rook, which should be enough for a fairly easy black win.
Nov-09-05  nateinstein: I think it took me around a minute. Not much to do on the kingside, went to the queenside, then trapped the queen :).
Nov-09-05  Ashram64: I dont really understand how the Queen is trap after 29. Nh5+ Bxh5 30. Bxc7 Rxc7 still can defend the Queen for a while..but white's position is lost.
Nov-09-05  unferth: surely this was a blitz game? otherwise Christiansen resigns on move 30 ...
Nov-09-05  unferth: <Ashram64><I dont really understand how the Queen is trap after 29. Nh5+ Bxh5 30. Bxc7 Rxc7 still can defend the Queen for a while..but white's position is lost.>

Instead of 30 ... Rxc7, 30 ... Bxd1 leaves black up a clear rook--not much different than the N for Q in the game continuation. But all roads lead to the abbatoir; the assorted mistakes & white's playing on beyond the point of reason make me pretty confident this was blitz, or at least severe mutual time pressure.

Nov-09-05  MaxxLange: Probably Black's flag was dangling, White resigned at move 40.
Nov-10-05
Premium Chessgames Member
  Richard Taylor: I solved this one but it took me a finite time! Christiansen is a great attacker - must have been a rare error by him.
Oct-07-06  aazqua: What a collosal blunder by christianson. The queen trap is as obvious as the disgust must have been on his face afterwards. I like the extra half dozen spite moves.
Nov-22-06  Dougy: An interesting idea is 29. Bd3, preventing the queen trap. E.g. 29... b6 30. Nf5+ Kf8 31. Qxe7+, or 29... Bd6 30. Nf5+

But this is refuted by the line:
29. Bd3 Bxg3! 30. Bxc4 Bxh2+ 30. Kxh2 dxc4

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