Warning: This is 3.0 Edition material. It is possible that there is more recent 3.5 Edition version.
Inaccurate?

Choke Hold

( Oriental Adventures, p. 61)

[General]

You have learned the correct way to apply pressure to render an opponent unconscious.

Prerequisite

Improved Unarmed Strike (PH) , Improved Grapple (OA) , Stunning Fist (PH) ,

Required for

Mighty Works Mastery I (OA) ,

Benefit

If you pin your opponent while grappling and maintain the pin for 1 full round, at the end of the round your opponent must make a Fortitude saving throw (DC 10 + 1/2 your level + your Wisdom modifier). If the saving throw fails, your opponent falls unconscious for 1d3 rounds.