Preventing enclosures from growing in fuseki
Try to prevent this formation in the fuseki. Usually the wedge on the right side helps, if played early.
In professional games the upper side stone is usually played one line further away, as shown here. That makes a five-space extension on both sides. Now White typically reduces at a or b.
Charles Matthews The basic wisdom about not allowing your opponent double wing formations around an enclosure is often illustrated by problems with ryojimari positions. It is interesting to use a database also to look at how the pros play such positions, in komi go. It certainly isn't the case that they make it a strict rule to deny the opponent the double wing formation.