From easiest to hardest_test position 5

[Dariusz]

Position nb 5: strategic maneuver
My engines cannot find move 48.R1f2. In 5 moves black positions is collapse.
The key is: change the position of the white king and move figures to more optimal posiotions.

Before start your engines, I suggest add additional cooling
Could you take the challenge ?

[D]2r4k/4qp1n/3r1np1/p1pPp1B1/PpP1P2P/1P3R2/6Q1/3B1RK1 w - - 15 48

Movie: 48.R1f2!! I believe is one of the best in this position

[Event "?"]
[Site "www.chesspresso.net"]
[Date "2014.08.03"]
[Round "?"]
[White "sedarpl"]
[Black "danieldeu"]
[Result "1-0"]
[ECO "C79"]

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.O-O Nf6 6.Re1 b5 7.Bb3 Be7 8.c3 Na5 9.Bc2 c5 10.d4 Qc7 11.Nbd2 O-O 12.b3 Bd7 13.Bb2 h6 14.Nf1 Nc6 15.Ne3 Rfe8 16.Nd5 Qb7 17.Nxe7+ Rxe7 18.d5 Na7 19.Nd2 Nc8 20.c4 Nb6 21.Rb1 Bg4 22.f3 Bd7 23.f4 Bg4 24.Qc1 Bh5 25.fxe5 dxe5 26.a4 b4 27.Rf1 Nbd7 28.Nf3 Bg6 29.Nh4 Bh7 30.Nf5 Bxf5 31.Rxf5 a5 32.Qe1 Ra6 33.Qh4 Re8 34.Rbf1 Qc7 35.Bc1 Qd6 36.g4 Nf8 37.g5 hxg5 38.Rxg5 Qe7 39.Qg3 g6 40.h4 N8h7 41.Rgf5 Kh8 42.Bh6 Qd6 43.R5f2 Qc7 44.Qg2 Rd6 45.Bd1 Rg8 46.Bg5 Qe7 47.Rf3 Rc8 48.R1f2 Ra8 49.Kf1 Rg8 50.Ke1 Qd8 51.Rf1 Qb6 52.Qh2 Re8 53.Rxf6 Rxf6 54.Bxf6+ Nxf6 55.h5 g5 56.Qf2 Nh7 57.Qxf7 Rf8 58.Qe7 Rxf1+ 59.Kxf1 Qf6+ 60.Qxf6+ Nxf6 61.d6 Nd7 62.Bg4 Nb8 63.d7 Nc6 64.Kg2 Kg7 65.Kh3 Kh6 66.Be2 Kg7 67.Kg4 Kf6 68.h6 Kg6 69.h7 Kxh7 70.Kf5 Kg7 71.Ke6 1-0

[Roger Brown]

Hello Dariusz Domagala,

You have five postings in one day on a similar theme.

I am suggesting that you consolidate future posts under the theme of easiest to hardest.

The proliferation is suggestive of flooding - which I do not think was your intent at all.

Please note that the posts are on-topic and are relevant.

Later.

[Dariusz]

Hello Roger
You have right.

Thank you for you suggestion.

[Roger Brown]

Hello Roger
You have right.

Thank you for you suggestion.

Hello Dariusz,

You are welcome.

Later.

[zullil]

[D]2r4k/4qp1n/3r1np1/p1pPp1B1/PpP1P2P/1P3R2/6Q1/3B1RK1 w - - 15 48

Movie: 48.R1f2!! I believe is one of the best in this position

Not one of the three best, at least according to the latest Stockfish:

Code: Select all

info depth 46 seldepth 71 multipv 1 score cp 306 nodes 159968526189 nps 30374858 hashfull 999 tbhits 0 time 5266478 pv g2f2 h8g7 g5e3 d6d7 f2g2 c8g8 g1h1 e7d6 f3g3 d6e7 h4h5 g7h8 f1g1 d7d8 d1f3 g6h5 e3h6 g8g6 g3g6 f7g6 g2g6 d8g8 g6f5 g8g1 h1g1 h5h4 h6e3 f6d7 e3f2 h8g7 f5g4 e7g5 f2h4 g5g4 f3g4 d7f6 g4f5 h7f8 g1f2 g7f7 f2f3 f7e7 h4g5 e7f7 f3e3 f7e7 e3f2 e7f7 f2f3 f7e7 f3g2 e7f7 g5e3 f8d7 g2f3 f7e7 e3g5 e7d6 f5d7 f6d7

info depth 46 seldepth 71 multipv 2 score cp 283 nodes 159968526189 nps 30374858 hashfull 999 tbhits 0 time 5266478 pv g1h1 c8e8 f3h3 e7d7 h3h2 e8g8 f1g1 d7d8 d1f3 d8f8 g2g3 f6d7 g3h3 f7f6 g5c1 f6f5 h4h5 g6g5 e4f5 d6h6 h2e2 f8d6 g1g2 d7f6 c1b2 f6d7 e2e1 h7f6 e1g1 f6h7 b2c1 d6f6 g1e1 g8g7 h1g1 h8g8 h3g4 f6f7 f3d1 f7e8 g4h3 e8e7 h3f3 d7f6 f3e3 e5e4 e3g3 e7d8 g3h2 d8f8 c1e3 g7f7 e3g5 h7g5

info depth 46 seldepth 71 multipv 3 score cp 268 nodes 159968526189 nps 30374858 hashfull 999 tbhits 0 time 5266478 pv g5e3 d6b6 f3g3 c8g8 g1h1 g8g7 e3h6 g7g8 f1g1 e7d7 h6e3 d7e7 d1f3 g8g7 e3h6 g7g8 g2h2 f6d7 g1g2 e7e8 h1g1 b6a6 h2h3 e8e7 h6g5 d7f6 g5e3 f6e8 h3h2 g8g7 e3g5 e8f6 g5h6 g7g8 g1f1 a6a8 h6e3 a8f8 f1e2 f6d7 g2g1 f7f5 g3g6 g8g6 g1g6 f5f4 e3f2 h7f6 h2g1

[zullil]

In response to 48. R1f2, Stockfish would play Rf8:

Code: Select all

+2.77  48... Rf8 49. Bh6 Rg8 50. Be3 Rb6 51. Rg3 Rg7 52. Bh6 Rg8 53. Bf3 Rd6 54. Be3 Ra6 55. Kf1 Rg7 56. Qh3 Ra8 57. Bh6 Rgg8 58. Qh2 Ne8 59. Rfg2 Nef6 60. Qg1 Rae8 61. Be3 Rc8 62. Ke1 Qf8 63. Ke2 Qe7 64. Bh6 Rcd8 65. Kd1 Qd6 66. Be3 Rc8 67. Kc1 Qc7 68. Kb2 Qe7 69. Qf2 Qc7 70. Bh6 Qd6 71. Kb1 Qc7 72. Kc2 Qd6 73. Be3 Qc7 74. h5 g5 75. Rg1 Rg7 76. h6 Rg6 (depth 52, 2:32:58)

[peter]

Hi Louis!

This is a real hard one, cause Black is already lost anyhow.
After Backward of this .pgn with your SF's variants, the one from the game and the one and the other own ones,

Code: Select all

[Event "www.chesspresso.net"]
[Site "www.chesspresso.net"]
[Date "2014.08.03"]
[Round "?"]
[White "sedarpl"]
[Black "danieldeu"]
[Result "1-0"]
[ECO "C90"]
[Annotator "Martan,Peter"]
[PlyCount "141"]
[EventDate "2014.??.??"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O Nf6 6. Re1 b5 7. Bb3 Be7 8. c3 Na5 9. Bc2 c5 10. d4 Qc7 11. Nbd2 O-O 12. b3 Bd7 13. Bb2 h6 14. Nf1 Nc6 15. Ne3 Rfe8 16. Nd5 Qb7 17. Nxe7+ Rxe7 18. d5 Na7 19. Nd2 Nc8 20. c4 Nb6 21. Rb1 Bg4 22. f3 Bd7 23. f4 Bg4 24. Qc1 Bh5 25. fxe5 dxe5 26. a4 b4 27. Rf1 Nbd7 28. Nf3 Bg6 29. Nh4 Bh7 30. Nf5 Bxf5 31. Rxf5 a5 32. Qe1 Ra6 33. Qh4 Re8 34. Rbf1 Qc7 35. Bc1 Qd6 36. g4 Nf8 37. g5 hxg5 38. Rxg5 Qe7 39. Qg3 g6 40. h4 N8h7 41. Rgf5 Kh8 42. Bh6 Qd6 43. R5f2 Qc7 44. Qg2 Rd6 45. Bd1 Rg8 46. Bg5 Qe7 47. Rf3 Rc8 48. R1f2 (48. Qf2 Kg7 49. Be3 Rd7 50. Qg2 Rg8 51. Kh1 Qd6 52. Rg3 Qe7 53. h5 Kh8 54. Rg1 Rdd8 55. Bf3 gxh5 56. Bh6 Rg6 57. Rxg6 fxg6 58. Qxg6 Rg8 59. Qf5 Rxg1+ 60. Kxg1 {4.78/30}) (48. Rh3 Rg8 49. Kh1 Ra6 50. Rg1 Qd7 51. Bf3 {2.58/30}) (48. Kh1 Re8 49. Rh3 Qd7 50. Bf3 Ra6 51. Rg1 Rg8 52. Qh2 Rg7 53. Bh6 Rg8 54. Rhg3 Raa8 55. h5 g5 56. Bxg5 Nxg5 57. Rxg5 Rxg5 58. Rxg5 Rg8 59. Rxg8+ Kxg8 60. Qg3+ {6.73/34}) 48... Ra8 (48... Rf8 49. Bh6 Rg8 50. Be3 (50. Rg3 Ne8 51. Be3 Ra6 52. Bg4 Rb6 53. Qh3 Ra6 54. Rfg2 Nef6 55. Bf3 {3.08/30}) 50... Rb6 51. Rg3 Rg7 52. Bh6 Rg8 53. Bf3 Rd6 54. Be3 Ra6 55. Kf1 Rg7 56. Qh3 Ra8 57. Bh6 Rgg8 58. Qh2 Ne8 59. Rfg2 Nef6 60. Qg1 {3.15/31}) (48... Re8 {2.71/28}) 49. Kf1 Rg8 (49... Kg8 {2.53/30}) 50. Ke1 Qd8 51. Rf1 Qb6 (51... Rf8 {3.00/27}) 52. Qh2 ( 52. Qh2 {5.19/30}) 52... Re8 53. Rxf6 Rxf6 54. Bxf6+ Nxf6 55. h5 g5 56. Qf2 Nh7 57. Qxf7 Rf8 58. Qe7 Rxf1+ 59. Kxf1 Qf6+ 60. Qxf6+ Nxf6 61. d6 Nd7 62. Bg4 Nb8 63. d7 Nc6 64. Kg2 Kg7 65. Kh3 Kh6 66. Be2 Kg7 67. Kg4 Kf6 68. h6 Kg6 69. h7 Kxh7 70. Kf5 Kg7 71. Ke6 1-0

K9.2 has this output:

2r4k/4qp1n/3r1np1/p1pPp1B1/PpP1P2P/1P3R2/6Q1/3B1RK1 w - - 0 1

Analysis by Komodo 9.2 64-bit:
48.Kh1 Te8 49.Th3 Dd7 50.Lf3 Ta6 51.Tg1 Tg8 52.Dh2 Tg7 53.Lh6 Tg8 54.Thg3 Taa8 55.h5 g5 56.Lxg5 Sxg5 57.Txg5 Txg5 58.Txg5 Tg8 59.Txg8+ Kxg8 60.Dg3+ Kh7 61.Kg2 Dd6 62.Dg5 Sg8 63.Lg4 Kh8 64.Kg1 Kh7 65.Lf5+ Kh8 66.Kg2 Df8 67.Kg3 Dd6 68.Kh2 Db6 69.Lg4 Dd6 70.Kh3 Kh7 71.Kg3 Kh8 72.Kh2 Kh7 73.Lf5+ Kh8 74.Kg3 Db6 75.Kg2 Dd6
+- (3.51) Tiefe: 42 03:25:42 298704MN

Pity, forgotten to change the german abbrevations again