@Texas:
I like the rule as it stands, otherwise it lets you game the system.Ã Â Here are a couple examples if you allow someone to move where they have units already present:
Poland is contested between Germany and Russia, Ukraine is Austria-controlled with a German unit present.Ã Â By allowing Germany to move troops to the Ukraine, you allow them to bypass any combat in Poland, or basically just walk through unscathed since combat is not required to be conducted in a contested beyond the initial invasion.
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If everything else in your example remains the same, but Ukraine is contested Germany can move through anyways. Your scenario is not a very big deal since 1. Germany had to get a unit to Ukraine on a previous turn in the first place (which means that a can opener move where Austria would wipe out a Russian controlled territory and Germany could move through on its next turn is not possible), and 2. Like I already said, Germany can do that anyways if the territory remains contested. If you want to talk about gaming the system, think of Russia’s position in the current game where they move out of the territory in question to make it no longer contested and therefore Germany would not be able to move in. Russia stops opposing the CP in a territory, and that makes it harder for the CP to move in? That’s what’s truly gamey and will lead to nonsensical gimmicks in-game.
@Texas:
Another example, the Germans have captured France’s northern coast and the UK has some forces inland  The UK conducts an amphibious assault and contests one of these territories.à  On the following turn, they would then be allowed to just continue inland without fighting through the German line.
Again, if the territory the UK has forces in inland happens to be contested, the UK can move through without fighting the German line. We are left with Powers avoiding contesting territories (conceptually, avoiding trying to fight to slow the enemy down), in order to slow the enemy down!
@Texas:
I understand the issue some have with the rule as it stands, but it also doesn’t make sense for a country to be to walk through an opposing countries entrenched troops unharmed either.
As I have shown, they already can do that. It just needs to be to a contested territory rather than an allied one. :?
Under my change, the can opener is barely any more potent (if at all) than it already is, since it requires that a unit of your power already be in a tt if you want to move there from a contested. Like I said above, a power still can’t get away with one power (Austria, for example) wiping out a russian-controlled ukraine and à then allowing Germany to move in, since Germany would not have already had a unit there. If you have to already have had a unit in the TT in which you would like to move into, it is decidedly NOT can opening, at least not any more than the rules currently allow in the contested tt movement rules.
Do my examples make sense or would a little more detail be helpful?