Before reading THIS post, go to the next one. It is hard to write the second part before I write the first part, so they are out of order...sorry.
This is the cut yarn pulled out all the way.
Yarn in needle, thread under the top loop of beginning dc.
Put the needle down in the middler of the previous loop from whence the yarn came, thereby making a top loop complete.
Weave in the end of the yarn (easily hid in the corner stitches!)
Take the yarn tail (cut from the skein) and thread it to make a 'bump' -
Look carefully - can you see the missing 'bump' below the yarn tail?
Make a small stitch so this dc looks just like its neighbors!
The photo below shows the newly made 'bump' to match the other stitches.
This photo shows the square with no chain 3's showing!
The beauty of doing this is you can't see your joining areas. The bad part is having to cut the yarn at each row if you want to be sure none of the rows has a chain three. There is a video on YouTube that shows a way to double crochet instead of doing a chain three turning chain. It's a bit tricky and takes some practice to make it look right. Click here for the video - YouTube -
If you can get the hang of it, when not changing colors you would not have to cut the yarn. However, I think this looks better, but those who don't crochet would never know the difference! Might not be able to tell the difference in a chain three either, so judge your audience and recipient as to how much work you want to put into the crochet piece.