There are three things that affect strategy. You and your opponents/teammates, the setup, and the dice.
Because there is no affect of dice G1 for instance, the only factors are you and the setup. This comes down to the fact that the setup offers some moves and you pick the best one.
…
If your side (but not necessarily your power) controlled a canal or narrow strait at the start of your turn, you may move
sea units through it (you can’t use it in the same turn that you capture it).
…
I’ve tried this cheesy move two or three times, and barring the best possible situation (Japan has 4 unloaded transports you can deny them, and they DOW next round anyway to get the Philippines), it’s more a hindrance than a help to the Allies. I don’t think I’ll be using it in the future.