If someone hits you through a crack the size of a pixel, then you were probably standing still. Terrorist snipers try to hit the passing CTs on Dust 2 at the door, but rarely hit them. You can pre-aim at a certain spot on the left side of the door so that your reaction matches the passing CT, but then the CT has to "run into" your spot while passing. Never, as a CT, go chasing Ts on a bomb planting map, at least not in the beginning of the round. If some rounds have passed, then you can be sure that there is at least one AWP on the enemy team. Let's take Dust 2 again. The CT is rushing to A and along to A short (stairs) and then peaks out in the middle. You can be sure that if that is at the beginning of a round, a T will wait middle on the T side an aim at A short. The sniper in that case only has to zoom and wait for the CT to run into the crosshair. Most people with AWP have a slow reaction time. So when you rush them from a good spot, they mostly miss their first shot and then it takes "ages" for them to fire another one. This is the chance for you to kill them. Also: Flashbangs. Then there are instances where the sniper who jumps out of a position to zoom and kill is faster with his reaction than the one standing and waiting. If you know the map layout better then you can for example imagine a certain point where you will shoot at and where an enemy is most probably standing. So strafe, zoom, confirm if enemy is there, shoot. This all happens in a matter of seconds. You can also go in to close combat with that thing, but it needs more luck I guess. There were kills in CS:GO for me where I bumped into a T running around the corner and you "just" have to react with quick shot (pressing zoom and shoot nearly simultaneously). Coming to an end, one of the MOST important aspects of a CS game is sound. Play with your headphones if you are still new to the game, observe the surroundings and listen to footsteps and so on.