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Matej Guid vs Miso Cebalo
Open Portoroz 04 (2004), Domen Lucija, rd 6, Apr-15
Sicilian Defense: Scheveningen Variation (B80)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Mar-06-06  dakgootje: Nice and easy puzzle, though my first split-second-reaction-move for saccing the queen wasnt right as i first wanted to sac it at b2, and thus this monday puzzle took me an immense 3 seconds to solve ;-)
Mar-06-06  Alterno: At last: a puzzle I could resolve without doubting the reason why it was the right move
Mar-06-06  RandomVisitor: <patzer2>with regard to the second puzzle, building on Fezzik's analysis, 30...h6 is best as black does not fear gxh6 Qd4 Kc1 gxh6 Qb8+ Kg7 Qg3+ Kf6
Mar-06-06  patzer2: <Ramdomvisitor> Good analysis of one of Black's best winning lines after 28...Rd1+ 29.Rd1 30.Bd1 h6!

However might <Fezzik>'s line with 30...g6! be just as good? It appears to offer Black most of the same winning positional advantages with few complications. As such, I wonder if it might be a move more likely to be played OTB by an expert or master.

Mar-06-06
Premium Chessgames Member
  kevin86: White avoided the obvious 28 ♖xe5 ♖xd1# and tried to get his rook out of Dodge,but the queen sac thinned out and exposed white's first row defenses. A back row mate with a twist.
Mar-06-06  YouRang: Now THAT'S a Monday puzzle. Basic back-rank attack.
Mar-06-06  RandomVisitor: <patzer2>the problem with ...g6 is that White can play Qxa5 and now threatens Qd8+ Kg7 Qf6+ perpetual check, something that he cannot do with ...h6. For example, 30...g6 31.Qxa5 Qd5 32.Bf3! if Qxf3 Qd8+ perpetual check.

In your first puzzle, Qe3 or Qf4 and it is mate in 3

Mar-06-06  patzer2: <Fezzek> <RandomVisitor> There appears to be a problem with the notation on the solution to my puzzle 2.

My intended solution after 28. Bf3 was 28...Rxd1+ 29. Rxd1 Rxd1+ 30. Bxd1 h6! (<Fezzek>'s 30... g6! also seems to work).

<Random Visitor> Sorry for the confusion. You might wish to take another look at <Fezzek's> 30...g6! in light of this correction as now 30...g6 31. Qxa5 Qd5 32. Bf3?? is met with 32...Qg8+ 33. Bd1 Qxd1#.

Fritz 8 indicates Black obtains a winning position after <28. Bf3 Rxd1+ 29. Rxd1 Rxd1+ 30. Bxd1 g6!> 31. Qxa5 Qd4! 32. Qa8+ (32. Bf3?? Qg1+ ) 32... Kg7 33. Qf3 Qxh4 34. Qe3 Ne6 35. c3 Qxg5 36. Qxg5 Nxg5 37. cxb4 h5 38. b5 h4 39. b6 h3 40. b7 h2 41. b8=Q h1=Q 42. Qe5+ f6 43. Qe7+ Nf7 44. Kc1 f4 45. Qa7 g5 46. Kd2 Qg2+ 47. Kc1 Qc6+ 48. Kd2 Kg6 49. Bc2+ f5 50. Bd3 Nd6 51. b4 Ne4+ 52. Kd1 f3 53. Qd4 Qa4+ 54. Kc1 Qa3+ 55. Kb1 Nd2+ 56. Kc2 Qxa2+ 57. Kd1 Ne4 58. Bxe4 Qe2+ 59. Kc1 fxe4 60. Qd6+ Kh5 61. Qd1 e3 62. b5 Qc4+ 63. Kb2 Qxb5+ 64. Ka3 e2 65. Qh1+ Kg6 66. Qe1 Qd3+ 67. Ka2 Qd1 68. Qf2 e1=Q .

P.S. This was based on a move-by-move look at the position on infinite analysis with Fritz 8 @ 15 depth per move.

Mar-06-06
Premium Chessgames Member
  thegoodanarchist: Why don't 2200-rated players make blunders like that for me???
Mar-06-06  McCool: Fastest solved puzzle ever. Half a second.
Mar-06-06  RandomVisitor: <patzer2>well the Qd4 line is playable for Black, so let's look at it...

32.Qa8+ Kg7 33.Qh1 seems best, protecting the pawn on h4. Black has Ne4 then white has Qe1.


click for larger view

Black still has an advantage. Rybka scores the diagrammed position as -1.26/18. Maybe next is h6, and Black will probably win.

In the h6 line I looked at earlier


click for larger view

Rybka scored it as -1.62/16. So that's why I picked it over the g6 line.

Mar-06-06  Knight13: "Bobby Fischer Teaches Chess"
Mar-06-06  Warrush: This literally only took me 2 secs
Mar-06-06  blingice: OMG, I SWEAR, THIS TOOK ME A BAJILLIONTH OF A SECOND. NO, I KNEW IT BEFORE I EVEN LOOKED AT IT, I SWEAR, OMG, I AM GREAT.

(satire for those who understand the joke, and for those who don't...)

Mar-06-06
Premium Chessgames Member
  OBIT: Geez, have mercy, chessgames - this position is much too difficult for a Monday! I might suggest you use the following position for NEXT Monday's puzzle:

Mickey vs Goofy, White to play:


click for larger view

48. ?

Mar-06-06
Premium Chessgames Member
  norami: You can't not solve that no matter how hard you don't try.
Mar-06-06  MorphyMatt: <norami> Yeah, good one. If you really want a challenge try this puzzle of mine:


click for larger view

White to move and mate in 14.

Mar-06-06  blingice: Oooh, sorry, <MorphyMatt>, Chessmaster sees a mate in only six moves:

1.Ne7+ Kh8 2.Nxf7+ Rxf7 3.Rc8+ Bd8 4.Rxd8+ Ne8 5.Rxe8+ Rf8 6.Rxf8#

Now what was the mate in 14 you had planned?

Mar-06-06  patzer2: <RandomVisitor> Thanks for providing winning solutions to both puzzles. Fritz 8 initially scored the 30...g6 line lower, but as I played it out on infinite analysis the advantage steadily grew to a clearly decisive result. IMO, after <28. Bf3 Rxd1+ 29. Rxd1 Rxd1+ 30. Bxd1>, both your 30...h6! and <Fezzek>'s 30...g6! are winning choices.
Mar-06-06  patzer2: <RandomVisitor> After Black plays 34...f6! in the first puzzle of your last post (diagram for 30...g6 line), Fritz 8 gives it a -1.75 evaluation @ 15 depth.

Of course the difference in evaluation might reflect the fact that Rybka is apparently stronger than Fritz 8. The articles at http://www.chessolympiad-torino2006... and http://computerchess.org.uk/ccrl/40...

have certainly caught my attention. Could this Rybka really have a 2919 ELO? Wow!

Mar-06-06  LivBlockade: <patzer2> and <RandomVisitor> - after 28.♗f3, what happens if Black plays 28...♕e3 (instead of ♖xd1)? How does White continue? Thanks.
Mar-07-06  Fezzik: @Patzer2

I chose 30...g6 because I didn't see any way for White to exploit the potential perpetual check and if that was the case, I'd rather defend the passed f5.

I didn't quite believe I'd solved the puzzle because there were no spectacular moves. But that's how chess games often go. I love the discussion you generated with those positions!

Thanks for adding those extra two puzzles! I stole the idea of building on a position from John Littlewood's "Chess Coaching", and I will certainly store this trio into my coach's file too.

Mar-07-06  MorphyMatt: <blingice> I was thinking 1. ♘e7+ ♔h8 2. ♕xh7+ ♘xh7 3. ♘xf7+ ♖xf7 4. ♘g6+ ♔g8 5. ♖e8+ ♘f8 6. ♖xf8+ ♖xf8 7. ♗e6+ ♔h7 8. ♘xf8+ ♔h8 9. ♘g6+ ♔h7 10. ♗g8+ ♔xg8 11. ♖c8+ ♗d8 12. ♖xd8+ ♔f7 13. ♖f8#, but that's 13 moves.
Mar-07-06  patzer2: <LivBlockade> After 28. Bf3 Qe3!?, White has the defense 29. Qxa5 =.

Per Fritz 8, play might continue 29. Qxa5 Rxd1+ 30. Rxd1 Rxd1+ 31. Bxd1 g6 32. Qxb4 = (0.00 @ 14 depth).

Mar-07-06  patzer2: <Fezzik> Thanks for the explanation on 30...g6! I've noticed a lot of masters will sometimes take a slightly smaller advantage and squeeze it for a bigger advantage, as opposed to going for a more difficult but seemingly stronger tactic. However, maybe that's just a difference in winning styles (e.g. Karpov versus Kasparov).
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