I blame elchino7, he made me assume it's fine to joke about the topic instead of actually discussing it
what should you do in order to your enemy loses his focus and Power decision ?
Well, that was my interpretation of what he asked for.
What OP then is looking for is CHEESE.
Cheese is a pejorative expression which refers to a strategy that is highly unconventional and designed to take one's opponent by surprise. In general, cheese is hard to beat if not scouted but easy to defeat if it is scouted.
1- Good ole mines/minefields in retreat paths.
2- Base rushes. From "surprise" light vehicles chasing down units till the end of the universe, to uploading a 250HT with PGs and chasing down units on retreat and reinforcing while doing so. If you can land a grenade on retreating units, bonus points.
TBH, most of the cheese has been removed from the game (for better i think). Ghostbarb wire, spamming soviet sandbags, mine on doors, tripwire on doors, etc.
Compared to other games, there's no such thing as "cheese" strats macro wise.