Oshitsubushi

Oshitsubushi is a forcing push that squashes or compresses an opponent’s stones, usually restricting their liberties and damaging their shape or eye potential. Unlike an ordinary push, its specific aim is to squeeze the stones into a cramped formation that can be exploited tactically.

The move pushes into a confined area and takes advantage of the opponent’s limited liberties. It may involve making a self-atari in order to force an unfavorable capture or continuation. The resulting profit can include reduced liberties, destroyed eye potential, or a direct tactical gain.

Accurate reading is essential: check the liberties, captures, and resulting eye shape before playing it. Without sufficient tactical support, a push may merely strengthen the opponent.