: It calculates the precise angle needed for the player's crosshair to intersect with the "head bone" hitgroup of an opponent. Packet Manipulation
The primary vulnerability that allows auto headshot cheats to exist is the reliance on client-side data. In older games like CS 1.6, the client (the player's computer) has a significant amount of authority regarding where the player is looking and shooting. cheat cs 1.6 auto headshot