Nine Patch Uneven Nine Patch
The Uneven Nine Patch style of quilt block is so named because not all of the nine individual patches are the same size as is the case in a regular nine patch quilt block. This style of quilt block is often used in 10" quilt block to make the math easier, but you will find this construction method in many other quilt blocks as well.

Slip Knot

Free Quilt Block Pattern

The Slip Knot quilt block is a bit of an optical illusion, in that it appears that fabrics weave across each other. This is technically an eight patch block as it is designed on an 8 x 8 grid, but I like to sew this block as an uneven nine patch because I find it easier to work in "chunks" instead of rows. However, please feel free to construct as you like.

This block contains simple patches -- squares, rectangles, half square triangles and flying geese. The challenge is that there are many pieces, and many seams. So, if you pay close attention to sewing a precise quarter inch seam allowance, you will find this block goes together easily.