I love designing cables and lace with twisted stitches. Straight lines of twisted stitch columns make every lace pattern so refined.
Sometimes those twisted stitch columns need to change direction. So we need to find a way to make a nice Right- and Left-Slanting decreases that don't interrupt the pretty twisted stitch pattern.
For the Crossed Left-Slanting Decrease we need to use a simple and straightforward K2TOG tbl (Knit 2 stitches together through back loop): Knit two stitches together through back loop and you will see how the stitch leans and twists in right direction.
The Twisted Right-Slanting Stitch Decrease is a tad more complicated, but the result is worth the effort.
That's how to do it:
1. Slip first stitch purlwise. 2. Slip second stitch purlwise through back loop. 3. Return both stitches to left needle. 4. Knit these two stitches together through front loop (as if for K2TOG). 5. Voila! Now we have Right-Slanting Decrease, twisted clock-wise and matching the twisted knit stitches of previous and following rows.