Tuhia he whakamāramatanga mō tēnei wāhanga - Ko te ariā o te patunga o tētahi pawn ki...b5 me...a6 he mea tawhito rawa. I whakamahia e Karel Opočenský te whakaaro ki etahi atu, ko Gideon Ståhlberg i Poděbrady 1936, Paul Keres i Pärnu 1937, Erich Eliskases i Prague 1937, me Theo van Scheltinga i te Buenos Aires Chess Olympiad 1939
He aha? I muri mai, ko te kemu a Mark Taimanov ki a David Bronstein i te Whakataetae Kaitono, Zürich 1953, i aro atu. Ko te nuinga o enei kēmu i timata hei King's Indian, me te Black anake i muri mai ka takaro... c5 me... b5. Tērā pea ko te kēmu tuatahi e whakamahi ana i te paerewa 1.d4 Nf6 2.c4 c5 3.d5 b5 ko Thorvaldsson <unk> Vaitonis, Munich Olympiad 1936.