Brioche decreases
In brioche knitting, it is not possible to decrease slanting stitches, as we are used to doing otherwise. This is because the brioche knitting pattern needs a continuous alternating stitch pattern to 'work'. For this reason, 2 stitches are always decreased at the same time in a brioche decrease, so that the pattern can continue seamlessly.
Again, there are right and left leaning decreases. I'll explain below how to work these for brioche knit stitch decreases.
Left slanting decrease (brLsl dec)
Work until the knit stitch column where decreases are going to happen (marked gold here).
Slip the next brioche knit stitch & its yarn over knitwise.
Knit the next two stitches together (i.e. the next brioche purl & knit stitch).
= 1 stitch decreased. In the picture you see the brioche purl & knit stitch together.
Pass the previously slipped stitch together with its yarn-over over the just knitted stitch.
= 1 more stitch decreased, 2 stitches decreased in total.
The brioche knit column slants to the left.
Right slanting decrease (brRsl dec)
Pass the previously slipped brioche knit stitch together with its yarn-over over the just knitted brioche purl stitch.
= 1 stitch decreased.
Slip this stitch back to the left hand needle.
Go into the next brioche knit stitch and its yarn over (here gold marked) and ...
... pass it over the first sticht on the needle.
= 1 more stitch decreased, 2 stitches in total.
The brioche knit column is slanting to the right.
The decrease is worked over the next 3 sts (i.e. 1 brioche knit, 1 brioche purl, 1 brioche knit stitch).
Slip the next brioche knit stitch & its yarn over knitwise.
Knit the next brioche purl stitch.