This tape presents both Bassai Dai and Bassai Sho, meaning storming or penetrating the fortress, with their lineage from Okinawa through Mas Oyama, Bobby Lowe, and Thomas Young. The forms are used in Kosho Ryu to develop otoko no atemi, the male percussion striking that requires total alignment of upper and lower body for a one-blow finish. Hanshi Juchnik discusses the difference between onna no atemi and otoko no atemi, the kata that emphasize each, the role of dachi during impact and gamae as primary, and demonstrates the bunkai of Bassai Dai with attention to centering, weight shifting, and the rocking motion that sets up the crushing blow.