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Lev Alburt vs Andrew Jonathan Mestel
Thessaloniki Olympiad (1984), Thessaloniki GRE, rd 6, Nov-24
King's Indian Defense: Averbakh Variation. Geller Defense (E73)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
May-26-19  goodevans: <scholes: What is wrong with 49 Bc2>

I looked at all the discovered checks and 49.Bc2 seemed to be a good response to most of them (except, of course, 48...Ne1+ or 48...Nb4+) and in the end I just gave up. I think <49.Bc2> is the right move here, forcing <49...Nd3>. Black has won a pawn and left white's K somewhat exposed but I don't think there's an immediate win.


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In the game continuation black twice passed up the opportunity to kill the game dead with ...Qa3+.


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<54...Qa3+> (or 56...Qa3+):

55.Kb1 Rb7+ 56.Bb3 Rxb3+ 57.axb3 Qxb3+ 58.Kc1 Be3+ 59.Qd2 Qc3+ winning the Q.

55.Kd2 Qe3+ 56.Kc2 Rc7+ 57.Kb1 Rc1#

May-26-19  goodevans: <JimmyRockHound: According to my silicon 49 Bc2 draws ...>

Nice to have my hunch confirmed!

May-26-19  goodevans: Some further thoughts on the position after <48...Nxb2+ 49.Bc2 Nd3 50.Qh2>:


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What saves white here is that black's R is tied to the defence of the h-pawn. He could win a piece with <50...Rb7+> but after <51.Nb2 Rxb2+ 52.Ka1> he has no way to defend that pawn.


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Trying to continue the attack with <52...Bc3> would be suicide: <53.Qxh5+ Kg7 54.Qh8+ Kf7 55.g6+ Qxg6 56.Rh7+> etc..

If instead he retreats with either <52...Kf7> or <52...Kg7> then <53.Qxh5> creates a position of <Mutually Assured Destruction> which neither side can win.

May-26-19  RandomVisitor: A quick look shows that 48...Nxb2+ has some problems and needs a deeper look:


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Stockfish_19052509_x64_modern:

41/77 22:09 -4.38 48...Nb4+ 49.Ka1 a3 50.Qh3 axb2+ 51.Kxb2 Qxh3 52.Rxh3 Bb6 53.Nxb6 Rxb6 54.Kc1 Ra7 55.a4 Ra5 56.Rh2 Rxd5 57.Kb1 Nd3+ 58.Ka2 Rc5 59.Rd2 Nb4+ 60.Ka1 d5 61.Rb2 Rc1+ 62.Rb1 Rc4 63.Rb2 Rbc6 64.Be2 Rc1+ 65.Rb1 R1c2 66.Rb2 Rxb2 67.Kxb2 Rc2+ 68.Kb3 Rxe2 69.Kxb4 e4 70.Rf1 Kxg5 71.Kc5 exf3 72.Rxf3 Kg4 73.Rf1 f3 74.a5 Ra2 75.Kxd5 f2 76.Ke4 Kg3 77.Ke3 Kg2

41/84 22:09 -1.27 48...Be1 49.Qh3 Qxh3 50.Rxh3 Bg3 51.Bc2 e4 52.fxe4 Ne5 53.Rc1 Nxc4 54.e5+ Kxg5 55.Bxh7 Nxe5 56.Rc8 h4 57.Rg8+ Kf6 58.Be4 f3 59.Rh1 f2 60.b3 Ra7 61.Kb2 Nd7 62.Bg2 axb3 63.axb3 Kf5 64.b4 Nf6 65.Rc8 Kg5 66.Kc3 Re7 67.Rf1 Re3+ 68.Kc2 Re1 69.Kd2 Nxd5 70.Rg8+ Kh6 71.Rxf2 Bxf2 72.Bxd5 Re5 73.Bf7 h3 74.Rg6+ Kh5 75.Rxd6+ Kh4 76.Rh6+ Kg3

<41/102 22:09 -0.58 48...Nxb2+ 49.Bc2 Nd3> 50.Rd1 e4 51.fxe4 Rb7+ 52.Bb3 Qg4 53.Rxd3 axb3 54.axb3 Bb6 55.Rdh3 Qxh4 56.Rxh4 Bd4 57.Kc2 Bg7 58.Rb1 Kxg5 59.Rhh1 Ra2+ 60.Kd3 Rg2 61.Nxd6 Rg3+ 62.Ke2 Ra7 63.e5 Ra2+ 64.Kf1 h4 65.Nc4 h3 66.d6 Bf8 67.e6 Bxd6 68.Nxd6 Rf3+ 69.Ke1 Re3+ 70.Kf1 Kg4 71.Nc4 Rxe6 72.Nb2 Re3 73.Rh2 Rxb3 74.Re2 Kg3 75.Kg1 f3 76.Rd2 Rba3 77.Rbd1 Ra1 78.Nc4

May-26-19
Premium Chessgames Member
  patzer2: <RV> Thanks for the deep Stockfish analysis of today's Sunday (48...?) puzzle.

Black of course has no problem winning after 48...Nxb2+ 49. Kxb2?? Rb6+! -+ (-9.67 @ 31 ply, Stockfish 10).

However, as your deep 41 ply Stockfish analysis indicates, finding a win after 48...Nxb2+!? 49. Bc2! Nd3! ⩱ to ∓ (the only move which doesn't turn the tables and give White the win) is at best problematic.

More importantly, 48...Nxb2+!? misses the clearly best move.

Much stronger and clearly winning is 48...Nb4+! 49. Ka1 (diagram below)


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when (diagram above) Black must rip open the position with 49...a3! -+ (diagram below)


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to assure the win.

The reason 49...a3! is so essential here is the best alternatives to 49...a3! -+ (-4.06 @ 34 ply, Stockfish 10) give White a level position.

The best alternative my Stockfish 10 gives to <48...Nb4+! 49. Ka1> 49...a3! -+ is an even endgame after <48...Nb4+! 49. Ka1> 49...Bb6 50. Nxb6 Rxb6 51. a3 Nc2+ 52. Bxc2 Qxc2 53. Rh2 Qd3 54. Qh3 Qf5 55. Qf1 e4 56. fxe4 Qe5 57. Qh3 Rb8 58. Qf5+ Qxf5 59. exf5+ Kxf5 60. g6 Rh6 61. g7 Rg8 62. Rh4 f3 63. Rg3 f2 64. Rf3+ Kg5 65. Rh1 = (0.00 @ 47 ply).

May-26-19
Premium Chessgames Member
  beatgiant: <RandomVisitor>,<patzer2> Any opinion or explanation about the computer's claim that 51...Qd3+ is better than 51...Bxb6?
May-26-19
Premium Chessgames Member
  patzer2: <beatgiant> Thanks for pointing out 51...Qd3+! -+ (-74.63 @ 32 ply, Stockfish 10) which is clearly stronger than 51...Bxd6? which allows 52. Rg2 Qd3+ 53. Kg2 = (0.00 @ 36 ply, Stockfish 10) or 52. Kb2 Qd3 53. Rg2 = (0.00 @ 36 ply, Stockfish 10).

Obviously, this game reflects at least four missed opportunities:

1. Black should have played 48...Nb4+! -+ instead of 48...Nxb2 ⩱.

2. White should have played 49. Bc2 ⩱ instead of 49. Kxb2 -+ .

3. Black should have played 51...Qd3+! -+ instead of 51...Bxd3 =.

4. White should have played 52. Kb2 = or 52. Rg2 = instead of 52. Qh2 allowing 52...Qd3+ -+.

P.S.: Of course such moves are difficult for humans to find over the board, especially under time pressure. Yet even with these missed opportunities, this was a well played and entertaining game.

May-26-19  RandomVisitor: After 48.Kb1:


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Stockfish_19052509_x64_modern:

49/98 4:36:24 -5.76 48...Nb4+ 49.Ka1 a3 50.Qh3 axb2+ 51.Kxb2 Qxh3 52.Rxh3 Bb6 53.Nxb6 Rxb6 54.Ba4 Rb8 55.Rgh1 Nxd5+ 56.Ka1 Ne3 57.Bb3 d5 58.Rc1 Rhh8 59.Rg1 Rb6 60.Rh4 Ra8 61.Kb2 Rc8 62.Ka1 Rh8 63.Rh2 h4 64.Rh3 e4 65.Ba4 Ra6 66.Bb3 Rh7 67.Kb2 Rb6 68.Ka1 Kf5 69.Kb2 Rg6 70.Kc3 Rxg5 71.Rgh1 Rg3 72.fxe4+ Kxe4 73.Ba4 d4+ 74.Kb4 Rxh3 75.Rxh3 Rh6 76.Bb5 f3 77.a3 f2 78.a4

49/89 4:36:24 -1.44 48...Be1 49.Qh3 Qxh3 50.Rxh3 Bg3 51.Rf1 Re7 52.Be2 Nf2 53.Rxf2 Bxf2 54.Nd2 Rb6 55.Bd3+ e4 56.Nxe4 Bd4 57.Nc5+ Kxg5 58.Ne6+ Rxe6 59.dxe6 Rxb2+ 60.Kc1 Bf6 61.e7 Rb8 62.Bb5 Bxe7 63.Bxa4 Ra8 64.Bb3 Ra5 65.Kc2 h4 66.Rh2 Re5 67.Ba4 Re3 68.Bc6 Bf6 69.Kd2 Bc3+ 70.Kd1 Kh5 71.Kc2 Be1 72.Kb2 Rc3 73.Be8+ Kg5 74.Rh1 Re3 75.Bc6 Bc3+ 76.Kc2 Bf6 77.Be4 Kh5 78.Kd2 Bc3+ 79.Kc2 Ba5 80.Bd5 Rc3+ 81.Kb2 Rd3 82.Bc4 Re3 83.Bd5 Bd8 84.a4 Kg5 85.Rh2

<48/111 4:36:24 -0.50 48...Nxb2+ 49.Bc2 Nd3> 50.Rd1 e4 51.fxe4 Rb7+ 52.Bb3 Qg4 53.Rxd3 axb3 54.axb3 Bb6 55.Rdh3 Qxh4 56.Rxh4 Bd4 57.Kc2 Bg7 58.Rb1 Kxg5 59.Rhh1 Ra2+ 60.Kd3 Rg2 61.Nxd6 Rg3+ 62.Ke2 Ra7 63.e5 Ra2+ 64.Kf1 h4 65.Nc4 h3 66.d6 Bf8 67.e6 Bxd6 68.Nxd6 Rf3+ 69.Ke1 Re3+ 70.Kf1 Kg4 71.Nc4 Rxe6 72.Nb2 f3 73.Rg1+ Kh4 74.Kf2 h2 75.Rg8 Rh6 76.Rc1 Rxb2+ 77.Kxf3 Rf6+ 78.Ke4 Re2+ 79.Kd3 Ref2 80.Rc4+ Kh3 81.Rh8+ Kg2 82.Rg8+ Kf3

May-26-19
Premium Chessgames Member
  agb2002: White is about to play Bc2.

Black has five pieces ready to attack the white king, starting with 48... Nxb2+:

A) 49.Kxb2 Rb6+ (the other rook must prevent Qxh5+)

A.1) 50.Nxb6 a3+

A.1.a) 51.Kxa3 Qd3+ followed by Bxb6 and the white king is in a mating net. For example, 52.Bb3 Bxb6 53.Rc1 Ra7+ 54.Kb4 Ba5+ 55.Ka3(4) Bc3#.

A.1.b) 51.Kb3 Qd3+ 52.Ka4 Bxb6 as above.

A.1.c) 51.Ka1 Bc3#.

A.1.d) 51.Kc1 Rc7+ and mate in two.

A.2) 50.Ka(c)1 Q(R)b1#.

A.3) 50.Ka3 Qd3+ 51.Bb3 (51.Kxa4 Qxc4+ 52.Ka3 Qb4#) 51... Rxb3+ and mate next.

A.4) 50.Bb3 axb3 (50... Qd3 51.Nxa5 unclear) 51.axb3 (51.Nxb6 Qc2+ 52.Ka1(3) Qxa2#) 51... Rxb3+ 52.Kxb3 Qd3+ and mate soon (53.Kb2 Rb7+; 53.Ka2 Qxc4+; 53.Ka4 Qxc4+ 54.Ka3 Bb4+ 55.Kb2 Ba3+).

B) 49.Bc2 Nd3

B.1) 50.Rd1 Rb7+

B.1.a) 51.Ka1 Bc3+ 52.Nb2 Bxb2+ 53.Kb1 Bc3+ 54.Bb3 Rxb3+ 55.axb3 (55.Kc2 Nc5+ and mate in two) 55... Nb4+ and mate in two.

B.1.b) 51.Bb3 Rxb3+ 52.axb3 (52.Ka1 Bc3+ 53.Nb2 Bxb2+ 54.Kb1 Nb4+ 55.Rd3 Qxd3#) 52... Ne1+

B.1.b.i) 53.Ka1 Bc3+ 54.Ka2 (54.Nb2 axb3#) 54... Qc2+ and mate next.

B.1.b.ii) 53.Kc1 Qc2#.

B.1.b.iii) 53.Kb2 Qc2+ and mate in two.

B.1.b.iv) 53.Ka2 Qc2+ 54.Nb2 axb3+ 55.Ka3 (55.Ka1 Bc3#) 55... Bc3 56.Na4 Qa2#.

B.2) 50.Nb2 Rb6

B.2.a) 51.Bxd3 Qxd3+ 52.Ka1 (52.Kc1 Rc7+ wins) 52... Rxb2 53.Kxb2 a3+ and mate next.

B.2.b) 51.Ka1 Rxb2 52.Bxd3 Qxd3 transposes to B.2.a.

C) 49.Ka1 Nxc4 50.a3 Bc3+ 51.Ka2 Rb6 wins.

D) 49.Kc1 Nxc4 50.Bc2 (50.Rg2 Rb6 wins) 50... Bd2+ 51.Kd1 (51.Kb1 Rb6+ wins) 51... Ne3+ 52.Kxd2 Qxc2+ 53.Ke1 Rb6 wins.

May-26-19  goodevans: <agb2002> Your admirably extensive analysis did miss one crucial line:

48...Nxb2+ 49.Bc2 Nd3 50.Rd1 Rb7+ 51.Nb2


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At first sight 51.Nb2 looks suicidal as black can just take the N with check but after <51...Rxb2+ 52.Ka1> the undefended h-pawn will let white back into the game.

May-26-19  cormier: goodevans: <agb2002> Your admirably extensive analysis did miss one crucial line:

48...Nxb2+ 49.Bc2 Nd3 50.Rd1 Rb7+ 51.Nb2

diagram: B.1c

At first sight 51.Nb2 looks suicidal as black can just take the N with check but after <51...Rxb2+ 52.Ka1> ;), the undefended h-pawn will let white back into the game.

from RandomVisitor: After <<<<<<48.Kb1:

diagram

Stockfish_19052509_x64_modern:

<48/111 4:36:24 -0.50 48...Nxb2+ 49.Bc2 Nd3> 50.Rd1> e4> 51.fxe4> Rb7+> 52.Bb3> Qg4> 53.Rxd3 axb3 54.axb3 Bb6 55.Rdh3 Qxh4 56.Rxh4 Bd4 57.Kc2 Bg7 58.Rb1 Kxg5 59.Rhh1 Ra2+ 60.Kd3 Rg2 61.Nxd6 Rg3+ 62.Ke2 Ra7 63.e5 Ra2+ 64.Kf1 h4 65.Nc4 h3 66.d6 Bf8 67.e6 Bxd6 68.Nxd6 Rf3+ 69.Ke1 Re3+ 70.Kf1 Kg4 71.Nc4 Rxe6 72.Nb2 f3 73.Rg1+ Kh4 74.Kf2 h2 75.Rg8 Rh6 76.Rc1 Rxb2+ 77.Kxf3 Rf6+ 78.Ke4 Re2+ 79.Kd3 Ref2 80.Rc4+ Kh3 81.Rh8+ Kg2 82.Rg8+ Kf3

May-26-19  cormier:


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Analysis by Houdini 4 d 25 dpa done

1. + / = (0.55): 32.a3 Bd7 33.Nc3 Qf7 34.Nf1 Be7 35.Nd2 Kg7 36.Bf1 Qg6 37.Na2 Ra6 38.Nb4 Ra8 39.Bh3 Bxh3 40.Rxh3 Rg8 41.Rh2 Rhh8 42.Re2 Rc8 43.Reg2 Ra8 44.Rf1 Rhg8 45.Rh1 Rh8 46.Rhg1 Rhg8 47.Rh2 Rh8 48.Rh3 Rag8 49.Rh2 Rd8 50.Rhh1 Rh7 51.Rg2 Rhh8 52.Rd1 Rhg8 53.Rdg1 Rge8 54.Rd1 Rf8 55.Rh1

2. + / = (0.50): 32.Nf1 c6 33.Na3 Kg7 34.Ka1 Bd7 35.Nd2 Qd8 36.Ndb1 Be7 37.Nc3 Rh8 38.Nc2 Be8 39.Rg2 Bg6 40.Qf2 Rg8 41.Qg1 Qe8 42.Qe1 Qd8 43.Qh4 Bf7 44.Rhg1 Rf8 45.Bf1 Re8 46.Rd2 Rg8 47.Rh2 Rh8 48.Rhh1 Rg8

May-26-19  cormier:


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Analysis by Houdini 4

44...Bxd5 45.exd5 Qf5+ 46.Ne4 bxc4 47.Qh3 Qxh3 48.Rxh3 Nd3 49.Be2 Rb6 50.Bxd3 cxd3+ 51.Kxd3 Rxb2 52.Rc1 Rc7 53.Rhh1 Rxa2 54.Ra1 Rb2 55.Rhb1 a3 56.Rxb2 axb2 57.Rb1 Rb7 58.Nxd6 Rd7 59.Nc4 Rxd5+ 60.Kc2 h4 61.Rxb2 Kxg5 62.Rb7 Bd8 63.Nd2 Rc5+ 64.Kd3 Rc7 65.Ne4+ Kf5 66.Rb1 Ra7 67.Rh1 Ra3+ 68.Ke2 Ra2+ 69.Kd3 Be7 70.Kc4 Ra3 71.Nc3 Ra8 72.Ne4 Rd8 73.Kc3 Rh8 74.Rh3 Rc8+ 75.Kd2 Ra8 76.Kd3 Ra3+ 77.Ke2 -+ (-3.31) Depth: 22 not dpa

May-26-19  goodevans: <cormier> Re your response to my last post: I think what you're saying is that RandomVisitor's Stockfish analysis prefers <50...e4> in that line to <50...Rb7+> (as proposed by <agb2002>).

At least part of the reason for that is that the latter is thwarted by the remarkable <51.Nb2!> which is the critical defence that <agb2002> missed.

So I think we're in agreement?

May-26-19  cormier:


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Analysis by Houdini 4 d 20 dpa done

1. -+ (-1.95): 44.Qh3 Qxh3 45.Rxh3 b4 46.Nb5 Rb6 47.b3 Bxb5 48.cxb5 Rxb5 49.bxa4 Nxa4 50.Nc4 Bb6 51.Rgh1 Bc5 52.Kd3 Nb6 53.R3h2 Nxc4 54.Kxc4 Ra5 55.Bb3 Kxg5 56.Rg2+ Kf6 57.Rg8 h4 58.Rh3 Raa7 59.Kb5 Rhb7+ 60.Kc4 Rc7 61.Kd5 Rh7 62.Rg4 Ra5 63.Kc4 Rc7 64.Kd5 Rc8 65.Rgxh4 Bf2+ 66.Kxd6 Bxh4 67.Rxh4

2. - + (-2.55): 44.Qh2 Rb6 45.Qh3 Qxh3 46.Rxh3 b4 47.Nb5 b3+ 48.axb3 Bxb5 49.cxb5 Bxd2 50.Kxd2 Rxb5 51.bxa4 Rxb2+ 52.Kc3 Ra2 53.Rgh1 Nxa4+ 54.Bxa4 Rxa4 55.Kd3 Kxg5 56.Rg1+ Kf6 57.Rc1 Ra3+ 58.Rc3 Rxc3+ 59.Kxc3 h4 60.Kc4 Rh6 61.Kc3 Rh8 62.Kd3 Rh7 63.Kc4 Rh6

May-26-19  cormier:


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Analysis by Houdini 4 d 22 dpa done

1. = (0.10): 41.Rh2 Ba5 42.Rc1 a3 43.b3 Rh8 44.Bf1 Rb6 45.Rc2 Kg7 46.Rg2 Qd8 47.Ka1 Ra6 48.Rh2 Ra8 49.Ndb1 Qe7 50.Rc1 Bd8 51.Rg2 Be8 52.Rd1 Rg8 53.Rg1 Kh7 54.b4 Na4 55.dxc6 bxc6 56.c5 dxc5

2. = (0.05): 41.Rc1 Ba5 42.Bf1 a3 43.b3 Rh8 44.Rc2 Qd8 45.Rh2 Kg7 46.Ka1 Ra8 47.Ndb1 Qe7 48.Rc1 Bd8 49.Rg2 Be8 50.Rd1 Rg8 51.Rg1 Kh7 52.b4 Na4 53.dxc6 bxc6 54.c5 dxc5

May-26-19
Premium Chessgames Member
  agb2002: <goodevans: ... At least part of the reason for that is that the latter is thwarted by the remarkable <51.Nb2!> which is the critical defence that <agb2002> missed.>

Actually I remember to have considered 51.Nb2 Rxb2+ 52.Ka1 Rxa2+ but I carried out the analysis along several breaks and it seems I forgot 51.Nb2 after resuming work at the B line.

Anyway, 50... Rb7+ is, according to Deep Fritz 14, worse than 50... e4, which never occurred to me at any point.

Thanks a lot for pointing out this glitch.

May-26-19  namesrue: Can anyone help me spot the refutation of 48...Ne1+? My idea was that it wins the exchange:

48...Ne1+
49 Ka1 Qd3
50 Rxe1 Bxe1
51 Qxe1 Qxc4

if 49 Kc1, so Qd3 doesn't come with a back rank threat on d1, then

49...Qd3 anyway and if not 50. Rxe1, then maybe something like 50. Nxa4 will leave white open to Rc7+

50. g3 leaves black with a fork with Nxf3

May-26-19
Premium Chessgames Member
  beatgiant: <namesrue>
Assuming we can accept your line, after

48...Ne1+
49 Ka1 Qd3
50 Rxe1 Bxe1
51 Qxe1 Qxc4

White has <52. Be2> skewering the queen and one rook, while also threatening 53. Bd3+ skewering the king and the other rook while also threatening to resume the kingside attack with 54. Qe4. At the very least, I don't think Black will come out the exchange ahead.

May-26-19  cormier: yes <goodevans> ...

from RandomVisitor: After <<<<<<48.Kb1:

diagram

Stockfish_19052509:

<48/111: 24 -0.50 48...Nxb2+ 49.Bc2 Nd3> 50.Rd1> e4> 51.fxe4> Rb7+> 52.Bb3> Qg4> 53.Rxd3 axb3 54.axb3:

...


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Analysis by Houdini 4

50...e4 51.fxe4 Rb7+ 52.Bb3 Qg4 53.Rxd3 axb3 54.axb3 = / + (-0.47) Depth: 24 dpa ... also, ..... ;) and so therefore:


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Analysis by Houdini 4 d 24 dpa done

<1. = / + (-0.40): 54...Bd8> 55.Rdh3 Bxg5 56.Qxh5+ Qxh5 57.Rxh5 Rxb3+ 58.Kc2 Rg3 59.Kb2 Bf6+ 60.e5 Bg7 61.R1h2 dxe5 62.Nxe5+ Kf6 63.Rf2 Ra4 64.Rc2 Ke7 65.Rc6 Ra5 66.Kc2 Kd8 67.Rd6+ Kc7 68.Rc6+ Kb8 69.Rb6+ Ka7 70.Re6 Ra2+ 71.Kb1 Rf2 72.Rh1 Kb7 73.Kc1 Ra3 74.Kb1 Bxe5 75.Rxe5 Kb6 76.Rh6+ Kc5

<2. = / + (-0.28): 54...Bb6> 55.Rdh3 Qxh4 56.Rxh4 Bd4 57.Kc2 Bg7 58.Rb1 Rf7 59.Kd3 f3 60.Rf1 f2 61.Ke3 Rb7 62.Nd2 Bc3 63.Rxf2 Bxd2+ 64.Rxd2 Kxg5 65.Rhh2 Rxb3+ 66.Rd3 Rxd3+ 67.Kxd3 Ra3+ 68.Kc4 h4 69.e5 dxe5 70.d6 Kf6 71.d7 Ra4+ 72.Kd5 Rd4+ 73.Kc6 Ke6 74.Rxh4 Rd6+ 75.Kc5 Rxd7 76.Kc6 Rd4 77.Rh8 Kf5 78.Re8

May-26-19
Premium Chessgames Member
  morfishine: I guess if you guessed the first move right, then thats ok
May-26-19  cormier: RandomVisitor: After 48.Kb1:

diag...

Stockfish_19052509_

49/98: -5.76 48...Nb4+ 49.Ka1 a3:

.....


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Analysis by Houdini 4 d 22 dpa done only

1. - + (-2.52): 50.Rg2 Bb6 51.Nxb6 Rxb6 52.Qf2 axb2+ 53.Qxb2 Ra7 54.Rd2 Ra5 55.Rdh2 Ra8 56.Rd2 h4 57.Rdh2 Ra7 58.Rg2 Ra5 59.Rgh2 Ra8 60.Rd2 h3 61.Bc2 Nxc2+ 62.Qxc2 e4 63.Qxe4 Qxe4 64.fxe4 Rb3 65.Rb2 Rg3 66.Rb6 f3 67.Rxd6+ Kxg5 68.Kb2 f2 69.Rd7 Rf3 70.Rf1 Re8 71.Rg7+ Kf6 72.Rg4 Ra8 73.Rh4

2. - + (-3.52): 50.Qh3 axb2+ 51.Kxb2 Qxh3 52.Rxh3 Bb6 53.Nxb6 Rxb6 54.Bb3 Nxa2 55.Rb1 Nb4 56.Kc3 Rc7+ 57.Kd2 Ra6 58.Rhh1 Ra3 59.Rb2 Rc5 60.Rg1 h4 61.Rg4 Nxd5 62.Rxh4 Kxg5 63.Rh1 Rb5 64.Rhb1 Ne3 65.Ke2 Nf5 66.Bd1 Rxb2+ 67.Rxb2 Nd4+ 68.Kf2 d5 69.Rd2 Ra1 70.Be2 Ra7 71.Bd3 Ra3 72.Be2 Rc3 73.Ra2 Kf5 74.Bd1 Rc1

3. - + (-4.71): 50.Rh2 axb2+ 51.Rxb2 Nd3 52.Bc2 Bc3 53.Kb1 Bxb2 54.Rd1 e4 55.fxe4 Qxg5 56.Qxg5+ Kxg5 57.Bxd3 Bd4 58.a3 Rc7 59.Ka2 Bc5 60.Be2 h4 61.Kb3 Rb7+ 62.Kc2 Ra4 63.Rf1 h3 64.Rh1 Rh7 65.Kb3 Raa7 66.e5 dxe5 67.Nxe5 Rxa3+ 68.Kc4 Rc7 69.Nf3+ Kg4 70.Nd4+ Kg3 71.Ne6 Ra4+ 72.Kb3 Raa7 73.Nxc7 Rxc7 74.Rf1 h2 75.Bf3 Bf2 76.Bh1 f3 77.Rd1 Bc5 78.Kc4 f2 79.Kd3 Re7 80.Rf1 Re3+ 81.Kd2 Re8 82.Kd3 Bd6

May-26-19  jes47: Terrible puzzle! Not only does 49 Bc2 lead to an unclear position (black has an advantage an a strong initiative, but not a clear win), the thematic move is wrong. The winning move is not 48... Nxb2, but 48... Nb4+! 49 Ka1 a3 and now Stockfish 10 rates the position as -+ -3.59

Compare this with 48... Nb2 49 Bc2 which Stockfish 10 rates as -0.96, advantage to black, indecisive in a 36-ply analysis.

Doesn't anyone check the puzzles before posting them?

May-26-19  jes47: I hadn't noticed cormier's post. He found the solution before me. Kudos!
May-27-19  RandomVisitor: After 48...Nxb2+ 49.Bc2 Nd3

-1.69/62 50.Rd1 e4 51.fxe4 Rb7+ 52.Bb3 Qg4 53.Rxd3 axb3 54.axb3

and now


click for larger view

Stockfish_19052509_x64_modern:

<53/123 -2.49 54...Bb6> 55.Rdh3 Qxh4 56.Rxh4 Bd4 57.Nd2 Ra1+ 58.Kc2 Ra2+ 59.Kd3 Be5 60.Rb1 Rb4 61.Nf3 Ra3 62.Rh3 Bg7 63.Rh2 Raxb3+ 64.Rxb3 Rxb3+ 65.Ke2 Bd4 66.Rg2 Re3+ 67.Kf2 Bc5 68.Nh4+ Kf7 69.Nf3 Rxe4+ 70.Kf1 Re3 71.g6+ Kg8 72.Ng5 Rb3 73.Ra2 Kg7 74.Ne6+ Kxg6 75.Nxf4+ Kf5 76.Ne6 Rf3+ 77.Kg2 Rd3 78.Ng7+ Kg6 79.Ne6 Be3 80.Ra5 Kf6 81.Ra4 Rxd5 82.Nc7 Re5 83.Ra6 Bc5 84.Kh3 Kg5 85.Ra5 Kg6 86.Ra6 Re3+ 87.Kg2 Rd3 88.Ra8 Bd4 89.Nd5 Be5 90.Ne7+ Kg5 91.Rg8+ Kf6 92.Nc6 Kf5 93.Ra8 h4 94.Nxe5 dxe5 95.Rh8 h3+ 96.Kf1 e4 97.Ke2 Kg4

53/57 0.00 54...Bd8 55.Rdh3 Qxh4 56.Rxh4 Bxg5 57.Rxh5 Rxb3+ 58.Kc2 Rg3 59.Kb2 Bf6+ 60.e5 Bg7 61.R1h2 Ra8 62.Nxd6 Re3 63.Kc2 Rxe5 64.Rxe5 Bxe5 65.Rg2+ Kf6 66.Ne4+ Kf5 67.Nd2 Ra5 68.Nf3 Bf6 69.Kd1 Rxd5+ 70.Rd2 Rb5 71.Ke2 Ra5 72.Rd3 Ra2+ 73.Rd2 Ra3 74.Rd3 Ra5 75.Rd2 Bc3 76.Rd3 Ra2+ 77.Kf1 Bf6 78.Rd6 Ra4 79.Ke2 Re4+ 80.Kf2 Ra4

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