There was something cool you could do in older version of counterstrike, you can tweak the ex_interp parameter from 1.0 to something lower like 0.5, in this way

There was something cool you could do in older version of counterstrike, you can tweak the ex_interp parameter from 1.0 to something lower like 0.5, in this way you have to aim 'behind' where the person was and hit. The advantage of this is with sniper rifles, when someone moving through a narrow gap the time is so short that your response time is not fast enough to click the instant they move through. But with ex_interp you can fire after they've gone through and still hit, not so fun for the target though, they get to safety then die :D