What is the Colle-Zukertort?
The Colle-Zukertort, or more accurately the "Zukertort variation of the Colle System," is a chess opening strategy where White locks up the center, causing transportation issues for Black, and can then attack the enemy King.
A video illustrating the opening is shown below. You might have to turn the volume up a bit to hear the audio.
To learn more about the C-Z, go to the Excerpts Page and download a couple free samples of Zuke 'Em.