Here's a video showing how to execute the TechKnitter's left-leaning decrease that she calls SYKT. Details can be found in her article here: http://techknitting.blogspot.com/2007/09/new-method-for-left-leaning-decreases.html

Slip – slip first stitch as if to knit on to RN

Yank – yank second stitch to stretch

Twist – super-twist second stitch by inserting RN around the back loop and move to RN

Knit – insert LN into front of stitches on RN and knit