Intentional 'puckering' whilst using two colours

How-to Questions
1

I’m not a terribly advanced knitter, but am trying to knit a tea cosy using a chequered pattern (found here http://www.ivillage.co.uk/homegarden/homemaking/crafts/articles/0,,695942_710899,00.html).

The pattern consists of casting on 80 stitches, and then knitting in blocks of 10 stitches per colour. It also, however, contains this note: “When carrying yarn across back of stitches pull slightly tight to form ‘pucker’ and twist each shade after every 4th stitch. Always twist both yarns at the beginning of the row.”

Could someone explain to me how this is supposed to work? I’m not sure how to create this pucker, i’ve tried a few rows, and I can’t see quite how to achieve it, especially when a set of 4 stitches falls in between the two different colours (ie. 2 stitches of each colour). I feel like perhaps this cannot actually be made any clearer, but as I said, I just don’t seem to be getting the same effect at all.

Any help explaining this more clearly would be greatly appreciated.

2

The pattern consists of casting on 80 stitches, and then knitting in blocks of 10 stitches per colour. It also, however, contains this note: “When carrying yarn across back of stitches pull slightly tight to form ‘pucker’ and twist each shade after every 4th stitch. Always twist both yarns at the beginning of the row.”

This is what it tells you, but to get it to pucker like that I think I would ignore the twisting after the 4th stitch. Try just making long floats (the strands that get carried across the back), and when you change to the new color pull the new color across tightly (in Fair Isle you usually want nice loose floats to prevent puckering) from where you used it last so that it draws up the last 10 stitches somewhat. After you do that for the number of rows it has you do the first color block, that pucker should be in place.

See if that works.