[Retros] Plaksin-Zolotarev problem (diagrammes, 109) Cooked?

[Vadai István]

N. Plaksin and A. Zolotarev
diagrammes 109, 04/1994 (3100)
1st Prize, diagrammes 1993-94
[QN2b3/rrpnPp2/1RK1pb2/1B6/P1k5/1nP1P1P1/2PP1P1b/3N4]
14+11. Promotions took place after White's e2-e3. Release the position.

The intention:
Retract -1. Ba6xQb5# Qh5-b5+ -2. Rb5-b6+ Bg7-f6 -3. f6xQe7 Qe2-h5
-4. f5-f6 Qe1-e2 -5. f4-f5 e2-e1=Q -6. f3-f4 d3xRe2 -7. Re1-e2
and White avoids retro-stalemate. Then the position unlocks by retracting
the following maneuvers: Qe7 issued from h3-h2-h1=Q, then retract wPh2xQg3
and unpromote this Q through bPa5xBb4-...-b2-b1=Q. Meanwhile unpromote bBg1
through g3-g2-g1=B, uncapture wPg2xQf3, and unpromote this Q through
b3-b2-b1=Q.
Then drive wBb4 to c1 and retract b2xQc3. Everything unlocks.
Four Ceriani-Frolkin Q-promotions!

In this proofgame there are ony three Ceriani-Frolkin promotions, two Q and
one R:

1. a2-a4, d7-d5 2. Nb1-c3, b7-b5 3. Nc3-b1, h7-h5 4. Nb1-c3, g7-g6 5.
Nc3-b1,
e7-e6 6. Ng1-f3, d5-d4 7. Nf3-e5, Nb8-a6 8. Ne5-c6, Na6-c5 9. Nc6-b8, b5-b4
10. Ra1-a3, Qd8-d5 11. Ra3-c3, Qd5-f3 12. g2xf3, Ke8-e7 13. Bf1-h3, Ke7-f6
14. Ke1-f1, d4xc3 15. Kf1-g2, Nc5-b3 16. Kg2-g3, Nb3-a1 17. Kg3-f4, a7-a5
18. Kf4-e4, Bc8-d7 19. Ke4-d4, h5-h4 20. Qd1-g1, Bf8-g7 21. Qg1-g4, Rh8-h5
22. Qg4-e4, Ra8-a7 23. Qe4-a8, Rh5-b5 24. Rh1-g1, Rb5-b7 25. Kd4-c5, Kf6-e5
26. Bh3-f5, Ng8-f6 27. Bf5-d3, Bd7-e8 28. Bd3-a6, Nf6-d7+ 29. Kc5-c6, h4-h3
30. Rg1-g5+, Ke5-d4 31. Rg5-b5, g6-g5 32. Nb1-a3, g5-g4 33. Na3-c4, g4-g3
34. Nc4-e3, g3-g2 35. Ne3-d1, g2-g1=B 36. b2xc3+, Kd4-c4 37. Bc1-a3, b4-b3
38. Ba3-b4, b3-b2 39. Bb4-a3, b2-b1=Q 40. Ba3-c1, Qb1-b4 41. Bc1-a3, Qb4-e7
42. Ba3-c1, Qe7-g5 43. Bc1-a3, Qg5-g3 44. h2xg3, h3-h2 45. Ba3-c1, h2-h1=Q
46. Bc1-a3, Qh1-h4 47. Ba3-c1, Qh4-e7 48. Bc1-a3, Bg1-h2 49. Ba3-b4, a5xb4
50. e2-e3, b4-b3 51. f3-f4, b3-b2 52. f4-f5, b2-b1=R 53. Rb5-b6+, Rb1-b5
54. f5-f6, Na1-b3 55. f6xe7, Bg7-f6 56. Ba6xb5++

But it is only one promotion after 50. e2-e3 (not 'promotions'). It's a
cook?

István Vadai (Hungary, Szeged)
vadai at tiszanet.hu