I have enjoyed practicing this short Chen Taijiquan form for the past few years. It was developed by Grandmaster Chen Zhenglei.
Chen Taijiquan Short 18 Movement Form Webpage
List of Movements of the Chen Taijiquan 18 Movement Short Form
Chen Taijiquan Old Frame First Form Laojia Yilu Webpage
Watch Grandmaster Chen Zhenglei perform the short form he created: