Under tani otoshi pin

Under tani otoshi pin is the judo-derived name for the bottom-position perspective when pinned by a tani otoshi (valley drop) finish that has transitioned into the knee-on-belly pin — the position the defender finds themselves in immediately after the valley-drop throw connects and the attacker establishes knee-driven top control.

Etymology. Tani (谷) means “valley”; otoshi (落) means “drop.” The “under … pin” framing captures the post-throw configuration where the attacker uses the dropped position from the tani otoshi throw as the entry into a knee-on-belly pin. The legacy judo osaekomi-waza (pinning) catalogue notes this transition as a common post-throw pinning sequence; in submission grappling and no-gi contexts the pin itself is generally just called “knee-on-belly bottom” without reference to the entry, but the judo terminology captures the throw-to-pin pathway.

Mechanics. From the bottom-position perspective, the entry context (the failed escape from the tani otoshi throw) leaves the defender’s hips flat and the upper-body orientation shifted toward the attacker’s drop side. The attacker’s knee establishes downward concentrated pressure into the torso; the defender’s primary structural problem is recovering hip mobility before the attacker secures submission threats or transitions to a more dominant pin.

Cross-reference. BJJ and English-speaking no-gi describe the position as “knee-on-belly bottom” without reference to the tani otoshi entry. Full mechanical coverage on Knee-On-Belly Bottom.