clip of the basis technic of Carreaux Crochet.
The complete PDF file with four test patches is available on Ravelry
Check 'projects' for nice ideas of testers and do not hesitate to share your own variations when you're done!
P.S. till the 15th of april 2020 you can download this pattern - or one of my other patterns - for free with the code 'Cum non tum age'. For personal use only!