Magic square is base of chains. Central stlyle players use it mainly.
this picture is famous base. It can set by AB CD sets.
Magic circle' chains are mainly 4-double or 5 chain.
It is similar to yayoi chain (for puyo tsu)
CHAIN ELEMENT
It is sinple 2-double. Ignition color is purple.
Then, extend to front. It is 3-double. Ignition point is red.
Compared with previous pic form, this form is added one chain before purple.
So, in this form, using some puyos to extend front before red, it become 4-double, rethal chain.
It is basic magic circle chain. And it is a important point there is able to extend by not only green but yellow and purple before red.
It is said that coming many puyo is good to use by ignition point and 4th chain.
Initial sets and example
without double, always 1st set is on 3-4 column horizontaly.
■AB CD
■AB CC
■AB BB (AB AA)
3rd set
(almost converting to tower)
Ignition point is yellow.
■Reference videos
第5回BぷよS級リーグ本戦 第3試合 電気イルカ vs のし - YouTube
Nosi (のし) and Denkiiruka (電気イルカ) is famous central style player.