[Pierre-Marie Baty]

This code is Rich "TheFatal" Whitehouse's method to estimate the duration of the next frame, in order to predict how long the pfnRunPlayerMove call for the movement of the bots should last. It looks correct, I find it strange that it could cause you trouble. Are you sure your problem comes from here ?

Anyway, there are several other methods to estimate the frame duration. The simplest one is to use the time difference between previous_time and gpGlobals->time in StartFrame(). But it is best to filter this value with time, and that's the purpose of msecnum and msecdel.