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Hillar Karner vs Viktor Gavrikov
Tallinn (1987), rd 11, Apr-21
Dutch Defense: Leningrad. Warsaw Variation (A88)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
Nov-14-19  Cheapo by the Dozen: If Black just leaves his queen and bishop hanging and plays 53 ... gf, it seems all White's ways of averting mate wind up with him down in material.

I didn't actually calculate the mate in the game line, but a simple 54 ... QxR would also have given Black a winning advantage.

Nov-14-19  Walter Glattke: 57.Kh2 Qf4+ 58.Kh3 Bc8+ 59.Kg3 Qg3+ 60.Kh1 Bb7+ wins / 53.-g2+? 54.Ke1 Qf4 55.Rxh6+ Kg7 56.Rxh4 less good
Nov-14-19  newzild: <<Cheapo by the Dozen:> If Black just leaves his queen and bishop hanging and plays 53 ... gf, it seems all White's ways of averting mate wind up with him down in material. I didn't actually calculate the mate in the game line, but a simple 54 ... QxR would also have given Black a winning advantage.>

Black can still go wrong after 54...QxR, for example:

54...Qxd6
55. Qxh4 Qxc7?
56. Qxh6+ Qh7
57. Qf6+ Rg7
58. Rd8+ etc

With a draw by perpetual check.

Correct is 55...Qd1+

Nov-14-19  popescuag: 57. Kh2 Qf4+ 58. Kh3 Bc8+ 59. Kg2 Qg3+ 60. Kf1 Bh3+ 61. Qg2 Qxg2# (60. Kh1 Bb7+ 61. Qg2 Qxg2#)
Nov-14-19
Premium Chessgames Member
  malt: Got 53...gf2 54.Q:f2 R:g1+ 55.Q:g1 Qf5+ 56.Kg2 e3+ 57.Kh2 Qf4+ 58.Kh3 Bc8+ 59.Kg2 Qg3+ 60.Kh1

(60.Kf1 Bh3+ )

60...Bb7+ 61.Rc6 B:c6+ wins

Nov-14-19  saturn2: I had 53...gxf2 

54. Qxf2 (forced. 54 Nf3 Qh3 is mate. as well as 54. Rxe6)

54...Bxf2 55. Rxe6 Bxg1 56. Rxe5 Bd4 This looked good enough.

Nov-14-19  Cheapo by the Dozen: <newzild>,

Good point.

Nov-14-19  mravikiran: Hillarious Viktory
Nov-14-19  1stboard: Lovely finish
Nov-14-19  saturn2: Failed today
53..gxf2 54. Qxf2 <Bxf2 ?> 55. Rxe6 Bxg1 <56. Bxe5+> Kh7 57. Re7+ Kg6 58. Rxb7
Nov-14-19  mel gibson: That was fairly easy -
I saw it after about 20 seconds.

Stockfish 10 says mate in 15:

53... gxf2

(53. .. gxf2 (g3xf2 ♕a7xf2 ♖g8xg1+ ♔f1xg1
♗h4xf2+ ♔g1xf2 ♕e6-f7+ ♔f2-e1 ♕f7xc7 ♖d6xh6+ ♔h8-g7 ♖h6-h3 ♕c7-c1+ ♔e1-f2 ♕c1-f4+ ♔f2-e1 e4-e3 a2-a4 ♗b7-e4 ♖h3xe3 ♕f4xe3 ♔e1-d1 ♕e3-c3 a4-a5 ♗e4-f5 b3-b4 ♗f5-e6 a5-a6 ♗e6-b3+) +M15/64 64)

Nov-14-19  patzer2: My first candidate move for today's Thursday (53...?) puzzle was 53...gxf2!

However, after 54. Qxf2, I didn't see that 54...Rxg1+! -+ (M13, Stockfish 10 @ 55 ply) was the strongest follow-up.

Instead, I went with 54...Qxd6 -+ (-4.43 @ 43 ply, Stockfish 10) expecting 55. Qxh4 Qd1+ (M7, Stockfish 10 @ 45 ply).

But after 54...Qxd6 55. Bxd6 Bxf2+ 56. Kxf2 e3+ 57. Kf1 Rc8 -+ (-4.90 @ 42 ply, Stockfish 10) Black's win, though still secure, takes longer.

P.S.: So where did White go wrong? White had an advantage coming out of the opening, but let it slip with 12. h6?! Nf6 ⩱ (-0.36 @ 31 ply, Stockfish 10).

Instead, 12. Nd4 ⩲ to ± (+0.62 @ 30 ply, Stockfish 10) would have kept White's advantage.

White's decisive mistake appears to be 40. Nh3?, allowing 40...e5! -+ (-1.70 @ 28 ply, Stockifsh 10).

Instead, 40. c5 bxc5 41. Rxc5 Rcd8 42. Ra5 Bb7 43. Rxa7 e5 ⩱ to ∓ (-0.50 @ 31 ply, Stockfish 10) gives White drawing chances.

Nov-14-19
Premium Chessgames Member
  agb2002: Black has the bishop pair for a bishop and a knight.

White threatens Rxe6 and Qxb7.

The first idea that comes to mind is 53... gxf2 54.Qxf2 (54.Rxe6 Rxg1#; 54.Cf3 Dh3#) 54... Qxd6 expecting 55.Qxh4 Qd1+ 56.Qe1 (56.Kf2 Qxg1#) 56... Rxg1+ and wins.

However, White has 55.Bxd6 Bxf2 56.Bxe5+ Kh7 57.Kxf2 e3+ 58.Kf1 (58.Kxe3 Rxg1) 58... Rc8 59.Nf3 (59.Bb2 Rc2 60.Ba3 Rxa2 wins) 59... Rc1+ 60.Ne1 Bc8 61.Bg3 (due to Bh3+ winning the knight) 61... Bh3+ 62.Kg1 Bg4 63.Kf1 Kg6 which looks winning (for example, 64.a4 Kg5 65.a5 h5 66.a6 h4 67.a7 hxg3 68.a8=Q Bh3+ 69.Kg1 Rxe1#) although with some effort.

A much quicker path is 54... Rxg1+ (instead of 54... Qxd6) 55.Qxg1 (55.Kxg1 Bxf2+) 55... Qf5+ 56.Kg2 e3+ 57.Kh2 Qf4+ and mate next.

Nov-14-19  TheaN: I actually saw this completely from start to finish, though I guess this Thursday is made slightly easier because, what else does Black really have?

After 53....gxf2 White really has just one proper defense against Rxg1#/fxg1=Q# and that's 54.Qxf2, a knight move fails on Q(x)h3# and e3 allows fxg1 and Rg2#. After 54.Qxf2 however, Black has tempos a plenty to win.

54....Rxg1+! may perhaps be the trickiest move today, despite Qxd6?! -+ also winning. 55.Qxg1 (Kxg1 Bxf2+ 56.Kxf2 Qf7+ -+ may objectively be best but White loses everything eventually) Qf5+ 56.Kg2 e3+ 57.Kh2 Qf4+ 58.Kh3 Bc8+ 59.Rd7 Bxd7+ 60.Kg2 Qg3+ 61.Kf1 (Kh1 Bc6+) Bh3+ 62.Qg2 Qxg2#. Not a move less, not a move more.

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