MacBook Pro Retina 13": change resolution to 1920x1200 pixels How can I change the resolution of my MacBook Pro 13" Retina (Late 2013) to 1920x1200 pixels?

The MacBook is able to use this resolution! It's e.g. using it, when connecting a second display which uses 1920x1200 pixels and checking the 'mirror displays' option.
You can use Retina DisplayMenu, QuickRes or SwitchResX.