2. You rely on the prerequisite, that domination victory goes to the player who is the last to keep control over his own original capitol. Let's say you've got 3 civs including yours. Civ A takes the capitol of civ B and civ B takes the capitol of civ A - who wins domination victory - civ C. A variant of this option might be - Civ A takes the capitol of civ B and you take the capitol of civ A in one turn after DoW civ A - game ends, no warmongoer penalty.