When playing forward, both full and abbreviated notation are used with equal success. Decoding the abbreviated notation does not cause any problems for the user.
Why can't you do the same in retro recording (except for moves with capture and pawn transformations, of course?).
Pascal Wassong (version by Gerd Wilts) Dedicated to Babette
7B/b1pp2p1/N1p1p3/2K5/PP6/1Pk1Pp2/QRPNrP2/nRqrB3 w - - 1 13
14+12. Last 55 single moves?
Full record of the solution
The last moves were: -1. .. Bb8-a7+ -2. Qa3-a2 f4-f3 -3. Ra2-b2 Qb2-c1 -4. Rc1-b1 Qb1-b2 -5. Rb2-a2 Qa2-b1 -6. Rb1-b2 Qb2-a2 -7. Qa2-a3 Qa3-b2 -8. Rb2-b1 f5-f4 -9. Qb1-a2 Qa2-a3 -10. h7-h8=B Qa3-a2 -11. Ra2-b2 Qb2-a3 -12. Ra3-a2 Qa2-b2 -13. h6-h7 Qb2-a2 -14. Qa2-b1 Qb1-b2 -15. h5-h6 Qb2-b1 -16. Rb1-c1 Qc1-b2 -17. Rb2-b1 Qb1-c1 -18. h4-h5 Qc1-b1 -19. Qb1-a2 f6-f5 -20. Ra2-b2 Qb2-c1 -21. Qc1-b1 Qb1-b2 -22. Rb2-a2 Qa2-b1 -23. Rb1-b2 Qb2-a2 -24. Ra2-a3 Qa3-b2 -25. Rb2-a2 a2-a1=N -26. Ra1-b1 f7-f6 -27. Rb1-b2 Qb2-a3 -28. h3-h4 (not h2-h4!) a3-a2 -29. a2xBb3 (this is no longer unique, since -29. Ra2-a1 Qa1-b2 -30. Rb2-b1 Qb1-a1 -31. Ra1-a2 Qa2-b1 -32. Rb1-b2 Qb2-a2 could've happened too) Bc4-b3 -30. b3xNa4 Nb6-a4+ -31. h2-h3 (this tempo is needed, so retracting h3-h4 earlier is necessary!) Ba7-b8 -32. Nb8-a6 Bb5-c4 -33. Na6-b8 a4-a3 -34. Nb8-a6 a5-a4 -35. Na6-b8 Qa3-b2 -36. Nb8-a6 Qa4-a3 -37. Qa3-c1 a6-a5 -38. Rc1-b1 Qa5-a4 -39. Qa4-a3 Kb2-c3 and finally the position is unlocked.
It's in an abbreviated form:
The last moves were: -1. .. Bb8+ -2. Qa3 f4 -3. Ra2 Qb2 -4. Rc1 Qb1 -5. Rb2 Qa2 -6. Rbb1 Qb2 -7. Qa2 Qa3 -8. Rb2 f5 -9. Qb1 Qa2 -10. h7-h8=B Qa3 -11. Ra2 Qb2 -12. Ra3 Qa2 -13. h6 Qb2 -14. Qa2 Qb1 -15. h5 Qb2 -16. Rb1 Qc1 -17. Rb2 Qb1 -18. h4 Qc1 -19. Qb1 f6 -20. Rba2 Qb2 -21. Qc1 Qb1 -22. Rb2 Qa2 -23. Rb1 Qb2 -24. Ra2 Qa3 -25. Rab2 a2-a1=N -26. Ra1 f7 -27. Rbb1 Qb2 -28. h3 (not h2!) a3 -29. a2xBb3 (this is no longer unique, since -29. Ra2 Qa1 -30. Rbb2 Qb1 -31. Ra1 Qa2 -32. Rbb1 Qb2 could've happened too) Bc4 -30. b3xNa4 Nb6+ -31. h2 (this tempo is needed, so retracting h3-h4 earlier is necessary!) Ba7 -32. Nb8 Bb5 -33. Na6 a4 -34. Nb8 a5 -35. Na6 Qa3 -36. Nb8 Qa4 -37. Qa3 a6 -38. Rc1 Qa5 -39. Qa4 Kb2 and finally the position is unlocked.
What cannot be deciphered in an abbreviated entry?