They say that this game is won in the movement phase.
I often think of what can I destroy that is in my way but really the question is how can I out manouvere my opponent so I am in their way of have more OC on an objective than they do.
I fought knights the other day with white scars.
White scars are fast and mobile but so are knights!
Knights aren't easy to hide and just rely on a massive amount of firepower to remove the objective threats, meanwhile, white scars are fast and not too durable.
Take a few knights out, and they're cooked.
Stand in their way or where they prefer to move, not just in their way, because they can move over you sometimes and they can't score.
White scars can have a flat 6" reactive move when something moves within 9"
The other day fighting chaos knights in a game winning play, I reactive moved a squad of intercessors behind a wall.
He then shot and killed Khorsarro Khan and then realized he couldn't charge my intercessors to take the point because they were too far away and behind a wall.
That one movement denied him 10 points for scorched earth in my deployment zone.
It wasn't crazy fire power.
It wasn't a powerful unit.
It was a weak unit with a 6" move who couldn't take a knight down if it fought the whole game!