[Erax]

Thermo, let me see if I understood this. You were being attacked by two enemies and you surrendered to one of them. The guy you surrendered to doesn't want to allow it. Is that it ?

I would understand it if the other guy protested your surrender, but the one you surrendered TO ? How does your move harm him ? If he doesn't want to micromanage your planets he can just let them rot and he won't be any worse off than if you had surrendered to your other enemy.

So unless this is a 'role-playing' kind of game, I see no reason why he should be upset with you.

On a more general level, 'gamy' moves cannot usually be prevented. They are a flaw in the system, no one should be blamed individually for them (even if they spoil an entire game). The players and the GM should take their lumps, wise up and make new rules for their next games. Rolling back a turn, in any kind of game, will usually cause a LOT more resentment than it cures.