[Retros] Let's summarize Andrey's task :

[Nicolas.Dupont at math.univ-lille1.fr]

Exact proof games ending by a check-mate given by a piece returning home,
after having captured a fixed opponent.

Here are the actual shorter results :

With extra capture :

Knight 21 (ND)
Bishop 20 (ND)
Rook 20 (ND)
Queen 16 (AF)

Without extra capture :

Knight 27 (AF)
Bishop 24 (ND)
Rook 29 (ND)
Queen 22 (ND)

Best,

Nicolas.