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Europe Echecs

No. 455 , Apr. 1997 - SOLUTIONS

634 - M. Caillaud
Europe Echecs 455, 04/1997

1. h4 b6 2. Rh3 Ba6 3. Rf3 Bc4 4. Rf6 gxf6 5. Nc3 Bh6 6. Ne4 Bf4 7. c3 Nh6 8. Qa4 Rg8 9. Qc6 dxc6 10. b3 Qd3 11. Ba3 Qf3 12. gxf3 Rg5 13. Bh3 Ng8 14. Bc8 Be6 15. Ba6 Bc8 16. O-O-O e6 17. Bf8 Bd6 18. Bh6 Bf8 19. Kb2 Ke7 20. Ka3

Very nice symmetrical ballet of the Bishops.


635 - A. Kornilov
Europe Echecs 455, 04/1997
(This problem was later found to be cooked)

Bl. caps are last move -1. Rf6xe6+, axb, bxc, and the cross-caps h7xPg6 & g7xh6. Wh. caps are fxe and the cross-caps dxc & cxd. Wh. Pa2 was promoted on a8.

Author's intention was the retraction of:
-1. Rf6xCe6+ d3-d4
-2. Bf3-h1 d2-d3
-3. Bd1-f3 e2-e3
-4. Bb3-d1 Nd8-e6
-5. Be6-b3 Nb7xQd8
etc.

However, the position can be unlocked much more easily, according e.g. to the following proof game 1. b4 a5 2. b5 Nf6 3. g4 Ne4 4. Bg2 Ng5 5. Bc6 bxc6 6. Ba3 Ba6 7. Nc3 Qc8 8. Rb1 Ne6 9. g5 Qb7 10. g6 Qb6 11. h4 Qd4 12. Bc5 hxg6 13. Rb4 axb4 14. Bb6 Ng5 15. a4 e5 16. a5 Bb7 17. a6 Be7 18. a7 Ba6 19. Ba5 O-O 20. b6 Bc4 21. Rh3 Bd5 22. Rd3 Bh1 23. h5 Qd6 24. Rd5 Kh8 25. Rb5 Qd3 26. cxd3 c5 27. e3 Nc6 28. h6 Rg8 29. Qf3 Nd4 30. Qb7 c6 31. Qa6 Rab8 32. Ne4 Nde6 33. Ng3 Nf8 34. h7 Nfe6 35. Nf5 Nf8 36. Nh6 gxh6 37. Ke2 Bg2 38. d4 Bh3 39. d5 Nge6 40. Kf3 Bg2+ 41. Kg3 e4 42. d6 Ng7 43. Kf4 Nge6+ 44. Ke5 Ng5 45. d3 Nfe6 46. d4 Nc7 47. dxc7 Bd8 48. Kd6 Bh1 49. f4 Bg2 50. f5 Bh1 51. f6 Re8 52. Ne2 Re5 53. Ng1 Be7+ 54. fxe7 Rg8 55. a8=R f5 56. Rf8 Kg7 57. Rf7+ Kh8 58. Rg7 Bg2 59. Ne2 Bh1 60. Nf4 Rf8 61. Ne6 Rf7 62. Nf8 Ne6 63. Qa8 Rf6 64. Qe8 Bf3 65. Qf7 Bh1 66. Nxe6 Rfxe6+


636 - T. Volet
Europe Echecs 455, 04/1997

Bl. caps are a7xRb6 & d7xRc6. Wh. caps are axb, cxdxexf7, f2xe3 & the bPh on the h-file. The position unlocks with the reconduction of bBf8 and retraction of g7-f6. This requires extracting the wh. Queen and we have to allow the bK and his bKB to cross along the f8-g7-h6-g5 corridor. So that the bK has to go as far as h4, requiring that we reconduct the wP to h2. Then it is impossible to uncapture f2xe3 too early: the bKB was captured on b4 !

Retract:
-1. b4-b5 a7xRb6
-2. a3xBb4 and Bl. retropat is avoided.
Further unlocking requires retracting
wPh2-h4, wRh4xPh3 (3rd capture)
and later
-n. bBg7-h6 Qh6-h7
-n+1. h4-h3 Q..-h6
etc.

The 3rd capture is required to provide the tempo Bl. needs while the wQ gets away. A very precise and lovely puzzle in a light setting.


637 - A. Zolotarev
Europe Echecs 455, 04/1997
(This problem was later found to be cooked)

Bl. caps are dxe, fxe & g7xf6. Wh. only cap is axb for promotion on b8. Also the wPd2 was promoted on d8. The position unlocks with the reconduction of the bKB now on d2.

Shortest trip of the Bl. King assumes last moves were
-1. f7xNe6 Nd8-e6
-2. a4-a3 d7-d8=N
-3. a5-a4 d6-d7
-4. a6-a5 d5-d6
-5. d6xNe5 Ne5-d3
-6. a7-a6 Rd4-g4
-7. Ng4-f2+ Nf2-d3+
-8. Bc3-d2 Rd4-d2+
-9. Be5-c3 d4-d5
-10. Bf4-e5 c3-c4 (not d3-d4?)
-11. Bh6-f4 c2-c3
-12. Bf8-h6 Kg5-f5
-13. g7xQ/R/Nf6+ etc.

And now the bK uses the e8-d7-e6-e5-e4-e3 route. Last 17 single moves precisely determined with clever retro-tactics.

However it is also possible to retract
-1. f7xNe6 Nd8-e6
-2. a4-a3 d7-d8=N
-3. a5-a4 d6-d7
-4. a6-a5 d5-d6
-5. a7-a6 d4-d5
-6. h6-h5 d3-d4
-7. Kd4-e3 Rg5-g4+
-8. Ng4-f2+ f2-f3+
-9. h7-h6 Rh5-g5
-10. Bh6-d2 Bd2-c1
-11. Bf8-h6 Kf4-f5
-12. e6-e5+ etc.
with same trip length for the black King.