Damezumari
Damezumari, also known as shortage of liberties, happens when a group of stones cannot connect out, as doing so will put them in atari. Putting stones into a shortage of liberties is often a defensive technique in tsumego.
https://senseis.xmp.net/?Damezumari
This tag gives a hint.
Created by TwT.
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Diabolical, 2-1 point, Attack, Bamboo Joint, Belly Attachment Tesuji, Bent Four in the Corner, Bulky Five, Carpenter's Square, Clamp, Comb-Formation, Connect, Crane's Nest, Dame, Damezumari, Door Group, Double Atari, Double Ko, False Eye, Fuseki, Geta, Golden Chicken Standing on One Leg, Haengma, Hane, J-Group, Joseki, Ko, L+1 Group, L-Group, Ladder, Loose ladder, Miai, Monkey Jump, Moyo, Nakade, Nose Tesuji, Oiotoshi, Oshi-tsubushi, Patting the Raccoon's Belly, Placement, Rabbitty Six, Sabaki, Sacrifice, Seki, Semeai, Semeai Type 1, Semeai Type 2, Semeai Type 3, Semeai Type 4, Semeai Type 5, Semeai Type 6, Sente, Separate, Shimari, Snapback, Spiral Ladder, Squeeze , Superko, Symmetry, Tenuki, Throw-in, Tombstone, Tsumego, Under the Stones, Weak Carpenter's Square, Yose [Create new tag]