While single decreases (1 stitch decreased) will always lean either left or right, double decreases (2 stitches decreased) can be centred, or lean to the left or right. Depending on where you are shaping, and what you desire your finished result to be, you can choose which decrease to use.
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So next time a pattern calls for leaning decreases, don’t forget that you are the boss of your knitting, and you can choose which of the options given above is most pleasing to you.
Techknitting - all-round brilliant resource for illustrated tutorials:
Knittinghelp.com - these video tutorials are where I learned most of my decrease techniques:
|Midweek Masterclass - Double Decreases.pdf||1 MB|