This is a continuation of the general chainless foundation tutorial
. Get comfortable with the basic technique presented there before attempting this one. ^_^
This tutorial covers how to do solid increases and decreases while making a foundation row. ("Solid" meaning it won't leave a large hole).
You should get familiar with how to do solid increases and decreases in general before attempting them in a chainless foundation.
Let's start by making a solid decrease first. Outside of the chainless foundation technique, these stitches are normally written as dc3tog or sc2tog or some such. The basic description of this instruction is to work the number of stitches indicated, but only up to the last "yo, pull through", leaving an extra loop on your hook. Once you have the required number of stitches, you yarn over and pull through all loops on your hook.
What this does, is to join the tops of the stitches into one stitch.
In chainless foundation, you start by making your first stitch, all the way up until just before the last "yo, pull through". I'm doing double crochet, so this is what my first stitch looks like:
Get all of the loops on:
Finish the stitch, stopping short of the last "yo, pull through":
Repeat that for as many stitches as you need, then do a final, "yo, pull through all loops"
(This is dc2tog)