[Retros] Promotion to knight a must

[afretro]

Hello to all,
Surely this idea can be implemented in a shorter game:
1.Pe2-e3   Pd7-d5   2.Bf1-d3   Pd5-d4   3.Bd3-e4   Pd4-d3   
4.Qd1-e2   Pd3xe2   5.Pd2-d4   Qd8-d6   6.Ke1-d2   Qd6xh2   
7.Kd2-d3   Qh2xg1   8.Rh1-h5   Qg1-f1   9.Rh5-b5   Pe7-e5   
10.Bc1-d2   Bc8-e6   11.Bd2-a5   Bf8-b4   12.Sb1-a3   Pe2-e1=S
Promotion to knight is a must; other promotions destroy game uniqueness (btw producing only one extra solution resulting from the possibility to alternate black▓s 8th and final moves).
Best wishes,
Andrey