Try it out:
1. One-side connector smoke
Connector is a very important position on Overpass and it's a priority task for both teams to hold it. A one-side smoke can help the defensive side control the opponent's aggression and get kills. Luckily, it's pretty easy to throw.
2. Water pop flash
A water pop flash that blinds Boost and Short can be extremely useful both for attacking and retaking B.
3. Short molotov
Two variants of the Short molotov won't let the defensive side players pass through this position and will make it easier for the attackers to control the map.
4. "Magic position" under bridge
One player is enough to take B if you know the throws! In order to do that, you need to stay in the shown position and throw an Incendiary Grenade into Toxic, and a smoke one — into the plant. One or two more flashes will blind the players holding Help and Graffiti. Thus you can make it much easier to take the site and plant the bomb.
5. Bank wallbang
This wallbang can be useful when retaking A, since it allows to either smoke out or kill an enemy, holding Bank.
Bonus: Hiding spot in connector
With certain skill and after some practice, you can rapidly take this position and surprise the enemies with unexpected fire.
Previous episodes of «Useful tricks» (clickable):