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Ivan Marinkovic vs Bosko Abramovic
Belgrade (1991), Belgrade YUG
Sicilian Defense: Old Sicilian. Open (B38)  ·  1-0
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 2 OF 2 ·  Later Kibitzing>
Apr-13-08  TrueBlue: he he, doesn't seem so difficult when you see it, not sure how I missed it :(
Apr-13-08  BrettMT: Oh, this is great. Not the game (I had one move right, but it wasn't played), instead I just found out you can move the pieces now on the java board to try alternate moves!!
Apr-13-08  krpvksprv: Usually, you expext Black to win when it says Black to play. This puzzle did a little twist. 36. Bg2+ was my bet too followed by 37. Qf3.
Apr-13-08
Premium Chessgames Member
  DarthStapler: Didn't get it, but can't white play Qe1?
Apr-13-08
Premium Chessgames Member
  paulalbert: I actually got this one. It's a brilliant tactical idea, but the position cries for exploitation of the back rank weakness. Paul Albert
Apr-13-08
Premium Chessgames Member
  Marmot PFL: This is nice tactics, first break the king position with Bxg2+, then comes Qf3 with a double pin (Rxf3 Rd1+, or Rxd8 Qxc3) and white has to give back the piece, remaining a pawn down but what is worse with no defence for his king.
Apr-13-08  goodevans: <BrettMT: Oh, this is great... I just found out you can move the pieces now on the java board> Neat. I didn't know that either.
Apr-13-08  znprdx: ...36.Bxg2+ 37.Rx[B]g2 Qf3! 38. Be3 Bx[B]e3 39.Rx[B]e3 Rd1+ 40.Rd1 Rd8 41.Bb2 At 11 ply I'm way out of my depth...it is all pretty fuzzy now
Apr-13-08  eblunt: <DarthStapler: Didn't get it, but can't white play Qe1?>

No reason at all, but after 38 ...♖xd3, 39 ♗xd3 ♕xd3, white is still a pawn down.

Apr-13-08
Premium Chessgames Member
  johnlspouge: Sunday (Insane): Black to play and win.

Material: Even. The 2 Black Bs are on adjacent diagonals, with the battery Qb7 and Bc6 pointed at Pg2 and behind, Kh1. The Rd8 has an open file opposite Rd3, and only Rg8 needs to be activated. The White Kh1 is susceptible to back-rank mates, and Rd3 is particularly vulnerable to Bc6, with Bb1 unprotected behind it. The Bh6 is loose can be entangled by the move g5. Nothing pops out, so on to a thorough list of checks, captures, and threats.

Candidates (36): Bxg2+, Rxd3, Be4, Bg4, g5

36Bxg2+

37.Rxg2 Qf3 (threatening 38Qf1+ 39Qg1#)

The move 38.Rxf3 cannot protect against the threat, because of 38Rd1+ Rxg1#. If

38.Qe1 Rxd3 39.Bxd3 Qxd3,

Black is a P down without compensation, with Bs of the same color. To avoid being a P down, the White Qc3 must maintain protection of Rd3, so it can protect neither f1 nor g1. Thus, White must protect g1 with Bh6.

38.Be3 Bxe3 (renewing the threat)

White has 2 feasible responses.

(1) 39.Rxe3 Rd1+ 40.Re1 [Qe1 Rxe1+ 41.Rxe1] Qxc3 41.Rxd1

Black has the initiative against an open K and Q+P for R+B.

(2) 39.Qe1 Rxd3 40.Bxd3 fxe5 (threatening 41Rf8)

and now Black maintains the pin on Rg2 for as long as possible, takes over the f-file, and in the worst case, goes into an ending with 2 passed Ps with Bs of opposite color.

The alternative 37Qe4 to 37Qf3, although an apparent brilliancy, seems to be a loser.

38.Qd2 (threatening 39.Rxd8 Qxb1+ 40.Qd1)

38Qf5 (an attempt to pull Qd2 out of position) 39.Qe2

39Rxd3 Bxd3 40Qh3 (threatening <both> Bs, gaining a tempo because Bh6 is loose)

40.Bc1 Rd8 41.Rg3 Qd7 42.Bc2

and White is up a B for a P.

Time to peek. Time to check the kibitzing.

<<goodevans> wrote: I think this puzzles fantastic. Does anyone claim to have solved it yet?>

:) :) :) I had to work for this one (see the flawed line above), so I am going to claim it!!! This puzzle was murder, because there were so many false trails.

Apr-13-08  dabearsrock1010: Being a puzzle, Bxg2 is a natural move to consider, but man is Qf3 hard to see...I didn't even consider it in the slightest
Apr-13-08  DarkDragoon: According to Deep Fritz 10:
36 ... Rxd3 is simply wrong and gives White a 1.30 advantage. The correct move is 36. Bxg2 with 1.84 advantage for white (white is ahead 1.84 pawns). followed by 37 Rxg2 Qf3.
Apr-13-08  DarkDragoon: i mean black is ahead. u get the point.
Apr-13-08
Premium Chessgames Member
  johnlspouge: My losing line was really poor analysis. With <the last move before computer analysis> in angle brackets, my Mom-and-Pop Toga II 1.3.1 gives

[ply 15/51, time 00:21, value +7.41]

36Bxg2+ 37.Rxg2 <Qe4> 38.exf6 Bd4 39.Rxd4 Qxd4 40.Qxd4 Rxd4 41.f7 Rd1+ 42.Rg1 Rdd8 43.fxg8Q+ Kxg8 44.Be4 Kf7 45.Rf1+ Ke6 46.Bd5+ Kd6 47.Be3 Rc8 48.Kg2 Rb8 49.Rf7 g5 50.Bxg5 Rg8 51.h4

After 37.Qf3, Toga gives very different best play from my analysis, <<>the improvement> in double angle brackets:

[ply 15/49, time 00:57, value -1.98]

36Bxg2+ 37.Rxg2 <Qf3> 38.<<>h4> Qf1+ 39.Kh2 Qxb1 40.Rxd8 Rxd8 41.Qf3 Qe1 42.Qg3 Qd1 43.exf6 exf6 44.Be3 Qxb3 45.Bxc5 Qxg3+ 46.Kxg3 Rd3+ 47.Kf4 bxc5 48.Re2 Kg7 49.Re7+ Kh6 50.Rb7 Rd4+ 51.Ke3 Rxc4

Toga improves slightly on one of my other lines:

[ply 15/42, time 00:25, value -2.48]

36Bxg2+ 37.Rxg2 Qf3 38.Be3 <Bxe3> 39.Qe1 Rxd3 40.Bxd3 <<>Bd4> 41.Qe2 Qxe2 42.Rxe2 Bxe5 43.Be4 Rd8 44.Kg2 e6 45.h3 Kg7 46.Kf3 Kf7 47.Re1 Rd7 48.Rf1 f5 49.Ke2 Rd8

I am surprised that the position is evaluated so favorably for Black.

Apr-13-08
Premium Chessgames Member
  johnlspouge: Note the computer times for the analysis, by the way. We all should take up darts instead of chess puzzles.
Apr-13-08  Longbrow: <We all should take up darts instead of chess puzzles.> ...and take up reading. I just noticed 36...Bxg2+! 37.Rxg2 Qf3!! was already annotated.
Apr-13-08  znprdx: So is this a <CG> blunder? Why give us a position in which the player with the move misses the best move(Qf3) and loses?? <goodevans:...<Im not surprised, though, that Abramovic missed it over the board: Qf3 is just so unexpected!> Hmm - found it rather quickly...like suddenly I'm a 2450 player? So what is the verdict after the best defense 36Bxg2+ 37.Rxg2 Qf3 38.Be3 Bx[B]e3
<johnlspouge:> gives <39.Qe1> I had posted <39.Rx[B]e3>
Apr-13-08
Premium Chessgames Member
  Gilmoy: <znprdx>: It's part of <CG>'s forthcoming new feature <Puzzle of the Day for GMs> :)
Apr-14-08
Premium Chessgames Member
  al wazir: <imag: 36...Bxg2+ 37. Rxg2 Qf3 38. h3 Qf1+ 39. Kh2 Qxb1.> I don't see what black does after 40. Rxd8 Rxd8 41. exf6 Bd4 (41...exf6 42. Qxf6+; 41...e5 42. Qxe5 Bd4 43. Qe7) 42. fxe7, and white threatens 43. exd8=Q# and 43. Qxd4.

What am I missing?

Apr-14-08  Helios727: <al wazir> After 41. exf6 there comes Bd6+ 42. Rg3 Bxg3+ 43. Kxg3 Rd3+ forks the white king and queen.
Apr-14-08  Helios727: <znprdx> After 38. Be3 Bxe3 39. Rxe3 Rd1+ 40. Re1 Qxc3 41. Rxd1; black is now ahead in pieces and pawns.
Apr-14-08  karnak64: Well, since Mr. Abramovic didn't see it, I don't feel so patzerly for not seeing it.
Apr-14-08
Premium Chessgames Member
  al wazir: <Helios727: 36...Bxg2+ 37. Rxg2 Qf3 38. h3 Qf1+ 39. Kh2 Qxb1 40. Rxd8 Rxd8 41. exf6 Bd6+ 42. Rg3 Bxg3+> Thanks.

Now comes 43. Qxg3 Qc2+ 44. Qg2 Qxg2+. In this line black would have had to see 17 plies into the combination to be sure of winning. I don't feel bad about missing it.

Apr-14-08
Premium Chessgames Member
  patzer2: The Sunday April 13, 2008 puzzle solution is the winning double attack combination Black overlooked with 36...Bxg2! 37. Kxg2 Qf3!! .
Apr-15-08  sallom89: First time i get through a puzzle like this, i'm not sure because i don't solve them daily. Is it possible black to play and lose ? i don't get it lol.
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