That's how far I got. 17 squares; for a bed-size quilt, it would be 7x10 squares, makes 70. Right on. I'm not even sure that the top 9 can be united with the bottom 4. I went astray from the initial principle of a nine-patch in diamond position. The red ones in the middle row stick to the rule. Maybe I'll use the bottom row for another project; what do you think?