Mini-chinese variants
Keywords: Opening
Playing on the fourth line is also known in pro play. For example O Meien made this formation against Kato Masao in the 1994 Judan.
This unusual type was tried by Jowa in 1822, Kamimura Kunio in 1974. It is more likely that one tries to combine a play at a, that is, a 5-3 point 'the other way round', with a play such as b, for the sake of balance. That would be a Kobayashi variant, though.