If you always crochet increases or decreases at the same place, usually no circle is created, but a polygon (usually a hexagon) and you usually also see the points of the increases/decreases. In some cases it even looks quite decorative, but in others it is very disturbing.
Now the places of the increases and decreases could be distributed exactly evenly in each round, the problem here is that you have to be even more careful for it, than usual and to be honest I don't really understand the tables for it. That's why I have simplified the whole thing, that still doesn't give a perfect circle, but almost, and the big advantage is, if you've done it a couple of times, it works by itself, no matter what is written in the pattern :o)
If you have to crochet three stitches and then increase, I divide 3 by 2 and take the smaller number, so this is 1, which is the number of stitches crochet BEFORE the first increase. Then follows a round as it's written and then the increase is shifted again. In this round there are 5 stitches before increasing, i.e. 5 divided by 2 and also take the smaller number here, results in 2 stitches before the first increase and so it goes on and on. Offset always takes place in the round with the odd number of stitches before the increase or decrease.
For better understanding I just write down the first rounds, which usually starts a part:
sc 6 in MR - of course without any changes
inc x6 - don’t change anything
(sc 1, inc) x6 - at this time the offset starts: just flip the instructions and make (inc, sc 1) x6
(sc 2, inc) x6 - nothing to change
(sc 3, inc) x6 - offset again: sc 1, inc, (sc 3, inc) x5, sc 2
(sc 4, inc) x6 - it’s the even round - nothing to change
(sc 5, inc) x6 - offset again: sc 2, inc, (sc 5, inc) x5, sc 3
(sc 6, inc) x6 - even number of stitches before the increase - nothing to change
(sc 7, inc) x6 - offset again: sc 3, inc, (sc 7, inc)x5, sc 4
(sc 8, inc) x6 - nothing to change
(sc 9, inc) x6 - offset again: sc 4, inc, (sc 9, inc) x5, sc 5
The whole thing looks like this (on the left normal increases - on the right offset according to my method, not perfect, but halfway round):
The decreases make in the same way, if there is an odd number of stitches before decreasing -> offset. If the number is even -> nothing to change.
Some of you may wonder why I'll not write it like this in the patterns. It's very simple, it's much more time consuming and it's easier to make typing errors (I've made enough of them already). At least for me that's why.
It is also important not to change the increases and decreases if they are used for a special shape (a knee or cheeks, etc.). At these points, it is essential to follow the pattern. The method is really only suitable for places where you have to do increases and decreases evenly.