I am afraid that Pawns management is not trivial. You can 'create' enemy
Pawns in theoretically impossible positions, and it should not be so
evident, or construct a position in which it is impossible for both bands
going back to the past. Rules for Pawns management are necessary, although
I think it is not so easy!. Can be constructed a playable game with the
initial ideas?. If so, it would be great!.