Krug-50 JT
2017
1st Special Prize
- after Bourzutschky & Konoval -
White wins
Try: 1. Rc6+? Kd7 In the following two variations black saves the game by sacrificing the knight or the rook. This provides some comfort for the fact that in the actual mainline these two black pieces are captured on their initial squares. 1... Ke7? 2. Ne3! knight sacrifice 2... Nxe3 3. Kxf4 +- 2. Rc5 2. Ne5+ Ke7 3. Nxd3 cxd3 4. Bxd3 Nxb4! knight sacrifice (4... Rf3? 5. Be4 Rg3+ 6. Kh4 Rxc3 7. Bxd5 +-) 5. cxb4 Rxb4 = 2... Rxg4+! rook sacrifice 3. Kxg4 Nf6+ 4. Kf4 Nxh7 4... Bxh7? 5. Ke5! Ng4+ 6. Kd4 +- 5. b5 Nf8! 6. Ke5 Ng6+ 7. Kf6 Kd6 8. Rc6+ Kd7 9. Rc5 Kd6 positional draw
Solution: 1. Bg8+ Kd6 2. Rc6+! rook sacrifice (2. Bxd5? Rf5+ 3. Kh4 Kxc7 =) 2... Kxc6 3. Bxd5+ Kd6! The black king triangulates! (3... Kxd5 4. Kxf4 black is in zugzwang Be2 (4... Ke6 5. Ne5 Be2 6. Ke4 +-) 5. Ne3+ Ke6 6. Ke4 +-) 4. Kxf4 Kxd5
1st cyclic zugzwang - WTM
In order to win, white must reach the same position but with black to move. The shortest manoeuvre to pass the move to black lasts 35 moves! All moves from the cycle are unique optimal moves. 5. Ne3+ (5. Nf2?! Be2 6. Kf5?! Bd3+ 7. Kf6? Bc2! 8. Ke7 Ba4 =) 5... Ke6 6. Nd1 Kd5 7. Nb2 White threatens to bring the knight to c5. 7... Bc2! 8. Kg5 Bd3 (8... Ke4 9. Kf6 Kd5 10. Ke7 Bf5 11. Kd8 +-) 9. Kf6 (9. Na4? Ke5 =) 9... Kd6 White should bring the knight to a5 before he continues the king manoeuvre. 10. Nd1! (The shortest path to a5 via a4-c5-b7 doesn't work: 10. Na4?! Be4 11. Nc5 Bc6!; If the king starts the manoeuvre too soon, its knight gets stuck on b2: 10. Kf7?! Bf1 11. Ke8 Be2 12. Kd8 Kc6! 13. Ke7 Kb5! Now, in order to win, white has to free its knight... 14. Ke6 Bg4+ 15. Ke5 Bf3 16. Kf4 Be2 17. Ke3 Bh5 18. Kd2 Bg6 19. Ke2! Quicker than the immediate 18.Nd1. It is better to lure the bishop to f5 first using a triangulation. 19... Bh5+ 20. Ke3 Bg4 21. Kd2 Bf5 22. Nd1 Now the knight is free but also the black king! 22... Kc6 23. Ke3 Kd5 24. Nb2 Bg6 25. Kf4 Bc2 and we have returned to a previous position from the main line) 10... Be4 11. Ne3 Bd3 12. Ng4 Be2 13. Ne5 Bd3 14. Nf7+ Kd5 This move blocks the a8-h1 diagonal allowing the knight to go to b7. (14... Kd7 15. Ke5 +-) 15. Nd8! Kd6 16. Nb7+ Kc7 17. Na5! (Moving immediately to c5 is wrong: 17. Nc5?! Kd6 and the white king cannot move to f5.) 17... Kd6 18. Kf7 Kd7 19. Nb7! Black is in zugzwang! 19... Be2 (The bishop cannot move to the big diagonal: 19... Be4 20. Nc5+ +-) 20. Kf6 Kc7 21. Nc5 Kd6 22. Kf5 The bishop was not on d3! 22... Kd5 23. Kf4 Bf1 This is a new cyclic zugzwang position! (23... Bd3 24. Nxd3 cxd3 25. Ke3 Kc4 26. Kd2 +-)
2nd cyclic zugzwang - WTM
White will lose a tempo by a square-shaped manoeuvre (Nc5-d7-f6-e4-c5) while the black king triangulates (Kd5-d6-e6-d5). 24. Nd7 (It is too early to bring the knight to a4: 24. Na4? Be2 25. Ke3 Bd3 White is in zugzwang! 26. Nb6+ Kc6 27. Nc8 Kc7 28. Ne7 Kd6 29. Ng8 Ke5) 24... Kd6 25. Nf6 Ke6 26. Ne4 Kd5 27. Nc5
2nd cyclic zugzwang - BTM
27... Be2 28. Na4! Bd3 29. Ke3 Black is in zugzwang! The bishop has to leave the good square from which it controls the b1-h7 diagonal. 29... Bf1 30. Nb6+ Ke5 (In the following variation we can see the drawback of leaving the b1-h7 diagonal: 30... Kc6 31. Nc8 Kc7 32. Ne7 Kd6 33. Ng6! Kd5 (33... Bd3 34. Nf4 +-) 34. Kf2 Bd3 35. Nf4+ Ke4 36. Nxd3 Kxd3 37. b5 +-) 31. Kf3! This is a waiting move to lure the bishop to d3! (The immediate Nd7 is refuted by Ke6. 31. Nd7+?! Ke6) 31... Bd3 32. Nd7+ Kd6 (Ke6 is not that strong anymore: 32... Ke6 33. Nc5+ Kd5 34. Nxd3 cxd3 35. Ke3 Kc4 36. Kd2 +-) 33. Nc5 By attacking the bishop, white wins a crucial tempo. The black king cannot go back to the fifth rank, so the bishop must control e4. That means it has to leave the d3-f1 diagonal. 33... Bf5 The bishop also takes under control the important d7 square. 34. Kf4! (34. Ke3?! would throw away all the progress we have done so far. Ke5 M111 35. Na4 Bd7 36. Nb2 Be6 37. Kd2 Bd5 38. Nd1 Be4 39. Ne3 Bd3 40. Ng4+ Kf4 41. Nf6 Bf5 42. Nd5+ Ke4 43. Ne3 Be6 44. Nc2 Bg4 45. Nd4 Ke5 46. Kc1 Kd6 47. Kc2 Bh5 48. Nf5+ Ke5 49. Ne3 Bf7 50. Kb2 Ke4 51. Nc2 Bh5 52. Nd4 Kd5 53. Ka3 Bd1 54. Nf5 Kc6 55. Ne3 Bb3 56. Kb2 Kc7 $1 57. Nf5 Ba4 58. Kc1 Kd7 59. Nh6 Kd6 60. Kd2 Ke5 61. Ke3 Bd1 62. Nf7+ Ke6 63. Ng5+ Ke5 64. Ne4 Bc2 65. Nd2 Bd3 66. Nf3+ Kd5 67. Nh2 Bc2 68. Kf4 Bb1 $1 69. Ng4 Bd3 and we have returned to the cyclic zugzwang position from the main line) 34... Bg6 35. Ke3 Kd5 (35... Ke5 36. Nd7+ now that the bishop has left f5 this move works Kd5 37. Nb6+ +-) 36. Nd7 The threat is Nb6+ 36... Bd3 37. Nf6+ Ke5 38. Ng4+ Kd5 39. Kf4 +-
1st cyclic zugzwang - BTM
Watch this study on a dynamic board! Click here!
This study is based on the following computer endgame which is the longest win for KNPPKBP:
EG#188
2012
"For the KNPPKBP endgame the longest win is 102 moves and there is only one record position." 1. Na3 Kg2 2. Nb5 c6 3. Nd4 c5 4. Nb5 Kg3 5. Nc7 Bc8 6. Na8 Ba6 7. Nb6 Kf4 8. Nd7 c4 9. b4 Bb5 10. Nc5 Ke5 11. Nb7 Bc6 12. Na5 Bb5 13. Kb2 Kd5 14. Nb7 Bc6 15. Nd8 Kd6 16. Nf7+ Ke6 17. Nh6 Ke5 18. Kc2 Bd5 19. Ng4+ Kf4 20. Nf2 Bf3 21. Kc1 Kf5 22. Kd2 Ke5 23. Ke3 Bg2 24. Nd1 Bh3 25. Kd2 Bf5 26. Ne3 Bd3 27. Ng4+ Kf4 28. Nf6 Bf5 29. Nd5+ Ke4 30. Ne3 Be6 31. Nc2 Bg4 32. Nd4 Ke5 33. Kc1 Kd6 34. Kc2 Bh5 35. Nf5+ Ke5 36. Ne3 Bf7 37. Kb2 Ke4 38. Nc2 Bh5 39. Nd4 Kd5 40. Ka3 Bd1 41. Nf5 Kc6 42. Ne3 Bb3 43. Kb2 Kc7 44. Nf5 Ba4 45. Kc1 Kd7 46. Nh6 Ke6 47. Kd2 Ke5 48. Ke3 Bd1 49. Nf7+ Ke6 50. Ng5+ Ke5 51. Ne4 Be2 52. Nd2 Bd3 53. Nf3+ Kd5 54. Nh2 Be4 55. Kf4 Bg6 56. Ng4 Bd3 57. Ne3+ Ke6 58. Nd1 Bc2 59. Nb2 Kd5 60. Kg5 Bd3 61. Kf6 Kd6 62. Nd1 Be4 63. Ne3 Bd3 64. Ng4 Be2 65. Ne5 Bd3 66. Nf7+ Kd5 67. Nd8 Kd6 68. Nb7+ Kc7 69. Na5 Kd6 70. Kf7 Kd7 71. Nb7 Be2 72. Kf6 Kc7 73. Nc5 Kd6 74. Kf5 Kd5 75. Kf4 Bf1 76. Nd7 Kd6 77. Nf6 Ke6 78. Ne4 Be2 79. Nc5+ Kd5 80. Na4 Bd3 81. Ke3 Bf1 82. Nb6+ Ke5 83. Kf3 Bd3 84. Nd7+ Kd6 85. Nc5 Bf5 86. Kf4 Bg6 87. Ke3 Kd5 88. Nd7 Bd3 89. Nf6+ Ke6 90. Ng4 Kd5 91. Kf4 Be2 92. Ne3+ Kc6 93. Kf5 Bd3+ 94. Ke5 Kb6 95. Nf5 Kb7 96. Nd4 Ka6 97. Ke6 Be4 98. Nf5 Bc6 99. Nd6 Ba4 100. Ke5 Bb3 101. Kd4 Kb6 102. Nxc4+ +- "Attention, please! After 9.b4!! White has to make 92 moves without moving a pawn and capturing. A surprising example of a 50 move rule exception!"
No comments:
Post a Comment