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Roberto Martin del Campo vs Johann Hjartarson
Novi Sad Olympiad (1990), Novi Sad YUG, rd 7, Nov-24
Spanish Game: Morphy Defense. Mackenzie Variation (C77)  ·  0-1



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sac: 25...Qxe4 PGN: download | view | print Help: general | java-troubleshooting

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Premium Chessgames Member
  Jimfromprovidence: <agb2002> <B.1.a) 33.gxh6 Qe1+ 34.Kf3 Nh5+ 35.Kf4 (35.Kg4 Re4+ wins the queen)?>

I believe you are the only other one to take on this variation but your continuation is incorrect. The correct line is indeed the parenthesized 35 Kg4 Re4+.

The line 28...Re1+ 29.Kf2 Rf1+ 30.Kxf1 d2+ 31 Kf2 d1=Q 32.Qxc4 Re8 33 gxh6 Qe1+ 34 Kf3 Nh4+ 35 Kg4 Re4+ leads to 36 Bf4!, which forces a queen exchange, not loss.

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That’s what I tried to show in my earlier post and what makes this such a difficult puzzle for a Thursday.

Black is winning only after 36...Rxc4 37 Rxe1 Rxf4+!

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If white's king takes the rook with 38 Kxf4, then black takes it back after 38...Nxg2+.

Premium Chessgames Member
  doubledrooks: An interesting puzzle. After analyzing 28...Re1+ 29. Kf2 d2 for awhile, I looked for something more convincing and saw 29...Rf1+ 30. Kxf1 d2+ and now

a. 31. Qxc4 dxc1=Q+ 32. Rxc1 Ne3+ and black wins the queen

b. 31. Kf2 (the more stubborn line) d1=Q 32. Qxc4 (not 32. Qxf5? Qf1+, winning the queen) Re8, with good prospects against the exposed white king.

Jan-14-10  tacticalmonster: <As the game went, White could have tried 37 Rd1! to leave - David2009> The defense is refuted by 1 Rxg2 2 Rd8+ Kh7 3 Qd3 Qxd3 4 Rxd3 Rf2 5 Be3 Rf3! followed by Nf5 winning the bishop
Jan-14-10  wals: Rybka 3 1cpu 3071mb hash

Rybka 3 1-cpu - ,w, Novi Sad (Ol) 1990

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Analysis by Rybka 3 1-cpu: time 3min 30 ply 19

1. (-2.49): 31...dxc1Q+ 32.Rxc1[] Ne3+[] 33.Kg1 Nxc4 34.gxh6 Rb6 35.Rd1 Rxh6 36.Rd5 Rc6 37.Kf2 Nd6 38.Ra5 Nb5

2. (-2.41): 31...dxc1R+ 32.Kf2 Rb2+ 33.Kf3[] Rxa1[] 34.g6 Nd6 35.gxf7+ Kg7 36.f8Q+ Kxf8 37.Qxc7 Rf1+ 38.Ke3 Nf5+ 39.Ke4 Re2+ 40.Kd5 Ne7+ 41.Kc4 Rxg2 42.a3 Rg6 43.Kb3 Rf3 44.Qb8+ Kf7 45.Qe5 Rgf6 46.a4

(, 15.01.2010)

Premium Chessgames Member
  eternaloptimist: This puzzle is more difficult than medium IMO. It even took Shredder 11 a little while to figure it out! @ first it thought the position was = ! GM Hjartarson played an interesting match against Karpov in the World Championship Candidates Trnt.. many moons ago. Great combo by Hjartarson!
Jan-14-10  cyclon: 28. -Re1+ 29.Kf2 (Qf1 Rxf1+ 30.Kxf1 d2+ wins) -Rf1+ 31.Kxf1 d2+ 31.Kf2 (Qxc4 dxc1Q+ 32.Rxc1 Ne3+ wins) -d1Q 32.Qxc4 (Qxf5 Qf1+) -Re8 and White is in a kind of zugzwang, one of the threats being f.e. 33. -Qf1+ 34.Kf3 Nh4+ 35.Kf4 Ng6+ 36.Kf5 Qe5+ 37.Kg4 h5+ and 38.Kxh5 Qxh2+ 39.Kg4 Ne5+, or 38.Kf3 Qf5+ 39.Bf4 (Kg3 h4+) -Ne5 wins Queen to start with; also 37. -h5+ 38.Kh3 Qf5+ 39.g4 Qf3X.
Jan-14-10  cyclon: Okay, even the game defence didn`t seem to help White much.
Jan-14-10  turbo231: For a medium difficulty this puzzle is tuff. I played rybka 2 times, the best i could do was a draw. I set the level at 20 moves in 25 minutes, repeating.
Jan-14-10  Endrainbow: What about 28.. Rb8 to Rb2 - More danger for white?
Premium Chessgames Member
  patzer2: <johnlspouge: Toga seems to corroborate my impression that 28…Re1+ 29.Kf2 Rf1+ is unimpressive.>

At the end of your toga line <28...Re1+ 29. Kf2 Rf1+ 30.Kxf1 d2+ 31.Kf2 d1Q 32.Qxc4 Re8 33.Qf1 Qc2+ 34.Kg1 Nh4 35.Bf4 Re2 36.gxh6 Rxg2+ 37.Kh1 Qe4 38.h7+ Kxh7 39.Rd1>, Black's play looks impressive enough with a mate-in-two (i.e. 39...Rg3+! 40. Qf3 Qxf3# (or 40. Qg2 Qxg2#).

Jan-14-10  WhiteRook48: missed the Rf1+ idea
39 Bg3+ Rf2+ 40 Kg1 Rxf1+ 41 Rxf1+ is white's only chance
Premium Chessgames Member
  patzer2: For today's Thursday puzzle solution, Black's 28...Re1+! 29. kf2 Rf1+ 30. Kxf1 d2+ initiates a discovered check combination (supported by a skewer decoy sacrifice) for a winning attacking position.

The follow-up 32...Re8! is essential to maintaining Black's decisive advantage.

The final position is a very amusing illustrations of discovered check. After 38...Kxf7!, White can play a weak discovered check to win a pawn but Black can counter with a strong discovered check (e.g. 39. Bxh6+ Rf2+ ) to bring about a quick mate.

Jan-14-10  AxelBoldt: 36...Qe4 wasn't good, because it allowed 37.Rd1 with the idea 37...Nxg2 Rd4 or 37...Rxg2 38.Rd8+ Kh7 39.Qd3.

Better was 36...Rxg2 37.Re1 Rf2 and then either 38.Qh3 Re2 or 38.Qg1 Nf3.

Jan-14-10  turbo231: I've now played rybka 5 times; 0-4-1. Rybka is getting better and i'm tired.
Jan-14-10  lightbishop c5e6: yes, got it, 28... Re1+! 29.Kf2 Rf1+! 30.Kxf1 d2+ forcing a new queen and breathing on White's king.
Jan-14-10  Blunderdome: I'm actually less sure about the 31. dxc1Q+ 32. Rxc1 Ne3+ 33. Ke2 Nxc4 line than I was originally. With 34. gxh3 White has two pawns for the knight and very strong kingside pawns, while Black's pawns are all isolated and weak. Still a win for Black? Fritz has proved very good at drawing it, but that could be my fault.
Jan-14-10  ROO.BOOKAROO: Note that in the final position, after 38. ...Kxf7, White's Rook on a1 has never moved during the whole game. And the h1 Rook didn't do much either. Meanwhile Black moved his rooks 9 times.
Jan-14-10  johnlspouge: < <patzer2> wrote: <johnlspouge: Toga seems to corroborate my impression that 28…Re1+ 29.Kf2 Rf1+ is unimpressive.

At the end of your toga line <28...Re1+ 29. Kf2 Rf1+ 30.Kxf1 d2+ 31.Kf2 d1Q 32.Qxc4 Re8 33.Qf1 Qc2+ 34.Kg1 Nh4 35.Bf4 Re2 36.gxh6 Rxg2+ 37.Kh1 Qe4 38.h7+ Kxh7 39.Rd1>, Black's play looks impressive enough with a mate-in-two (i.e. 39...Rg3+! 40. Qf3 Qxf3# (or 40. Qg2 Qxg2#). > >

Hi, <patzer2>. Yes, there are disadvantages to reporting complete variations just before going to work. I understand that you are yanking my chain, but please note my disclaimer that < [snip] (humans can improve near the end of the complete computer variations). >

Congratulations, you are another winner ;>)

Jan-14-10  ILikeFruits: i smell...
something burning...
what could...
it be...
Jan-14-10  GaeBulg: I saw

1...Re1+ 2. Kf2 d2 3. Bxd2 Rxa1 4. Qxc4 Rb2

I don't know if that's any good though. The way the game played out may be a lot better, although Rybka seems to favor my line...

Jan-14-10  GaeBulg: Sorry, no Rybka favor's the game line at depth of 15 or higher.
Premium Chessgames Member
  Jimfromprovidence: Here’s another twist on this very interesting puzzle. 31 Kf2 below instead of 31 Qxc4 changes the dynamic of the puzzle, but not the solution!

click for larger view

Yes, 31 Kf2 prevents both 31…Ne3+ and 31 dxc1Q+. But after 31 Kf2 d1Q 32 Qxc4 Re8 we end up in the same position as the text!

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Now the solution comes down to which move is better for white, the text 33 Qf1 or 33 gxh6+.

Premium Chessgames Member
  patzer2: <Johnlspouge> Your Toga analysis is usually so reliable and strong that I thought my Fritz move-by-move look might have missed something.

I'm guessing that with a few more ply and a bit deeper look, Toga now confirms the 28...Re1+ 29. Kf2 Rf1+ 30. Kxf1 d2+ line is winning for Black?

Premium Chessgames Member
  LIFE Master AJ: Problem of the Day / Thursday; January 14th, 2010. (Black to play, 28 ... '?')

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White: Kg1, Qf4, Bc1, Ra1; White Pawns: a2, c3, g2, g5, & h2.

Black: Kg8, Nf5, Bc4, Rb8, Re2; Black Pawns: a6, c7, d3, f7, & h6.

Comments: White's 21.bxc4? ruined a fairly decent position, 21.b3 appears to favor White. " "

Black's 25...QxN/e4!? looked good, but maybe was not best.

White virtually blundered with 28.Qf4?, better was 28.QxN/f5, with probably an equal game.

28...Re1+; 29.Kf2, Rf1!+; sets up the winning discovery for Black, its the old promotion trick.

Jan-17-10  VargPOD: Thursday.

Position looks grim for black, but he has a forcing sequence up his sleeve.

28...Re1+ 29.Kf2 (forced) Rf1+! 30.Kxf1 (forced) d2+ 31.Qxc4 d1Q+ 32.Kf2 (forced) and position looks a lot better for black.

Total 3/4 this week, 6,5/11 total.

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